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#ifndef lint
static char *RCSid = "$Id: files.c,v 1.13 1993/05/10 06:19:06 anders Exp anders $";
#endif
/*
* The Regina Rexx Interpreter
* Copyright (C) 1992-1994 Anders Christensen <anders@pvv.unit.no>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* This module is a real pain, since file I/O is one of the features
* that varies most between different platforms. And what makes it
* even more of a pain, is the fact that it must be coordinated with
* the handling of the condition NOTREADY. Anyway, here are the
* decisions set up before (well ... during) the implementation that
* guide how this this thing is supposed to work.
*
* There are four kind of routines, structured in four levels:
*
* (1)---------+ (2)--------+
* | builtin | ----> | general | B C library
* | functions | A | routines | ----> Routines
* +-----------+ +----------+
* | |
* | |
* | V (3)--------+
* +----------------->+---> | Error |
* | routines |
* +----------+
*
* 1) Builtin functions, these has the "std_" prefix which is standard
* for all buildin functions. The task for these functions are to
* process parameters, call (2) which specializes on operations (like
* read, write, position etc), and return a decent answer back to its
* caller. There is one routine in this level for each of the
* functions in the library of built-in functions. Most of them are
* std_* functions, but there are a few others too.
*
* 2) These are general operations for reading, writing, positioning,
* etc. They may call the C library routines directly, or
* indirectly, through calls to (3). The interface (A) between (1)
* and (2) is based on the local structure fileboxptr and strengs.
* There are one function in this level for each of the basic
* operations needed to be performed on a file. Opening, closing,
* reading a line, writing a line, line positioning, reading chars,
* writing chars, positioning chars, counting lines, counting
* chars, etc. The interface (B) to the C library routines uses
* FILE* and char* for its operations.
*
* 3) General routines to perform 'trivial' tasks. In this level,
* things like retriving Rexx's file table entries are implemented,
* and all the errorhandling. These are called from both the two
* previous levels.
*
* There are three standard files, called "<stdin>", "<stdout>" and
* "<stderr>" (note that the "<" and ">" are part of the filename.)
* These are handles for the equivalent Unix standard files. This
* might cause problems if you actually do want a file calls that, or
* if one of these files is closed, and the more information is
* written to it (I can easily visulize Users trying to delete such a
* file :-)) So the standard files -- having set flag SURVIVOR -- will
* never be closed or reopened.
*
* Error_file is called by that routine which actually discovers the
* problem. If it is an CALL ON condition, it will set the FLAG_FAKE
* flag, which all other routines will check for.
*/
#include "rexx.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_ASSERT_H
# include <assert.h>
#endif
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#include <ctype.h>
#include <time.h>
#if defined(VMS)
# include <stat.h>
#elif defined(OS2)
# include <sys/stat.h>
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
#elif defined(__WATCOMC__) || defined(_MSC_VER) /* MH 10-06-96 */
# include <sys/stat.h> /* MH 10-06-96 */
# include <fcntl.h> /* MH 10-06-96 */
# ifdef HAVE_UNISTD_H
# include <unistd.h> /* MH 10-06-96 */
# endif
#else
# include <sys/stat.h>
# include <pwd.h>
# include <grp.h>
# include <fcntl.h>
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
#endif
#ifdef HAVE_LINUX_STAT_H
# include <linux/stat.h>
#endif
/*
* The macrodefinition below defines the various modes in which a
* file may be opened. These modes are:
*
* READ - Open for readonly access. The current read position
* is set to the the start of the file. If the file does
* not exist, report an error.
*
* WRITE - Open for read and write. The current read position is
* set to the start of the file, while the current write
* position is set to EOF. If file does not exist, create
* it. If file does exist, use existing data.
*
* UPDATE - The combined operation of READ and WRITE, but if file
* does not exist, issue an error.
*
* APPEND - Open in APPEND mode, i.e. open for writeonly, position
* at the End-Of-File, and (if possible) open in a mode
* that disallows positioning. The file will be a transient
* file. If the file does not exist, create it.
*
* CREATE - Open for write, but if the file does exist, truncate
* it at the beginning after opening it.
*/
#define ACCESS_NONE 0
#define ACCESS_READ 1
#define ACCESS_WRITE 2
#define ACCESS_UPDATE 3
#define ACCESS_APPEND 4
#define ACCESS_CREATE 5
#define ACCESS_STREAM_APPEND 6
#define ACCESS_STREAM_REPLACE 7
/*
* These macros is used to set the value of the 'oper' in the filebox
* data structure. If last operation on a file was a read or a write,
* set 'oper' to OPER_READ or OPER_WRITE, respectively. If last
* operation was repositioning or flushing, use OPER_NONE. See
* description of 'oper' field in definition of 'filebox'.
*/
#define OPER_NONE 0
#define OPER_READ 1
#define OPER_WRITE 2
/*
* Flags, carrying information about files. The 'flag' field in the
* 'filebox' structure is set to values matching these defintions. The
* meaning of each of these flags is:
*
* PERSIST - Set if file is persistent, if unset, file is treated
* as a transient file.
* EOF - Currently not in use
* READ - File has been opened for read access.
* WRITE - File has been opened for write access.
* CREATE - Currently not in use
* ERROR - Set if the file is in error state. If operations are
* attempted performed on files in state error, the
* NOTREADY condition will in general be raised, and the
* operation will fail.
* SURVIVOR - Set for certain special files; the default streams, which
* is not really to be closed or reopened.
* FAKE - Meaningful only if ERROR is set. If FAKE is set, and
* an operation on the file is attempted, the operation is
* 'faked' (NOTREADY is not triggered, and the result returned
* for write operations does not report that the output was
* not written.
* WREOF - Current write position is at EOF. If line output is
* performed, there is no need to truncate the file.
* RDEOF - Current read position is at EOF. Reading EOF raises the
* NOTREADY condition, but does not put the file into error
* state.
* SWAPPED - This flag is set if the file is currently swapped out, that
* is, the file is closed in order to let another file use
* the system's file table sloth freed when the file was
* temporarily closed.
*/
#define FLAG_PERSIST 0x0001
#define FLAG_EOF 0x0002
#define FLAG_READ 0x0004
#define FLAG_WRITE 0x0008
#define FLAG_CREATE 0x0010
#define FLAG_ERROR 0x0020
#define FLAG_SURVIVOR 0x0040
#define FLAG_FAKE 0x0080
#define FLAG_WREOF 0x0100
#define FLAG_RDEOF 0x0200
#define FLAG_SWAPPED 0x0400
/*
* So, what is the big difference between FAKE and ERROR. Well, when a
* file gets it ERROR flag set, it signalizes that the file is in
* error state, and that no fileoperations should be performed on it.
* The FAKE flag is only meaningful when the ERROR flag is set. If set
* the FAKE flag tells that file operations should be faked in order to
* give the user the impression that everything is OK, while if FAKE is
* not set, errors are returned.
*
* The clue is that if a statement contains several operations on one
* file, and the first operation bombs, CALL ON NOTREADY will not take
* effect before the next statement boundary at the same procedural
* level So, for the rest of the file operations until that statement
* has finished, the FAKE flag is set, and signalizes that OK result
* should be returned whenever positioning or write is performed, and
* that NOTREADY should not be raised again.
*
* The reason for the RDEOF flag is that reading beyond EOF is not really
* a capital crime, and a lot of programmers are likely to do that, and
* expect things to be OK after repositioning current read position to
* another part of the file. If a file is put into ERROR state, it has
* to be explicitly reset in order to do any useful to it afterwards.
* Therefore, if EOF is seen on input, RDEOF is set, and NOTREADY is
* raised, but the file is not put into ERROR state.
*/
/*
* The following macros defines symbolic names to the commands available
* in the Rexx built-in function STREAM(). The meaning of each of these
* commands are:
*
* READ - Opens the file with the corresponding mode. For a deeper
* WRITE description of each of these modes, see the defininition
* APPEND of the ACCESS_* macros. STREAM() is used to explicitly
* UPDATE open a file, while Rexx is totally happy with the
* CREATE traditional implicit opening, i.e. that the file is
* opened for the needed access at the time when it is
* first used. If the file to be opened is already open,
* it will first be closed, and then opened in the
* specified mode.
*
* CLOSE - Closes a file, works for any type of access. But if
* the file is a default stream, it will not be closed.
* Default streams should not be closed.
*
* FLUSH - Performs flushing on the file. Actually, I'm not so
* sure whether that is very interesting, since flushing
* is always performed after a write, anyway. Though, it
* might become an important function if the automatic
* flushing after write is removed (e.g. to improve speed).
*
* STATUS - Returns status information assiciated with the file as
* a human readable string. The information returned is the
* internal information that Rexx stores in the Rexx file
* table entry for that file. Use FSTAT to get information
* about the file from the operating system. See the
* function 'getrexxstatus()' for more information about
* the layout of the returned string.
*
* FSTAT - Returns status information associated with the file as
* a human readable string. The information returned is the
* information normally returned by the stat() system call
* under Unix (i.e. size, dates, access modes, etc). Use
* STATUS to get Rexx's information about the file. See
* the function 'getstatus()' for more information about
* the layout of the string returned.
*
* RESET - Resets the file after an error. Of course, this will
* only work for files which are 'resettable'. If the error
* is too serious, resetting will help little to fix the
* problem. E.g. writing beyond end-of-file can easily be
* fixed by RESET, trying to use a file which is named
* by an invalid syntax can not be correctly reset.
*
* READABLE - Checks that the file in question is available in the
* WRITABLE mode given, for the user that is executing the script.
* EXECUTABLE I.e. READABLE will return '1' for a file, if the file
* is readable for the user, else '0' is returned. Note
* that FSTAT returns the information about the accessmodes
* for a file, these returns the 'accessmode' which is
* relevant for a particular user. Also note that if your
* machine are using suid-bit (i.e. Unix), this function
* will check for the real uid, not the effective uid.
* Consequently, it may not give the wanted result for
* suid rexx scripts, see the Unix access() function. (And
* anyway, suid scripts are a _very_ bad idea under Unix,
* so this is probably not a problem ... :-)
*/
#define COMMAND_NONE 0
#define COMMAND_READ 1
#define COMMAND_WRITE 2
#define COMMAND_APPEND 3
#define COMMAND_UPDATE 4
#define COMMAND_CREATE 5
#define COMMAND_CLOSE 6
#define COMMAND_FLUSH 7
#define COMMAND_STATUS 8
#define COMMAND_FSTAT 9
#define COMMAND_RESET 10
#define COMMAND_READABLE 11
#define COMMAND_WRITEABLE 12
#define COMMAND_EXECUTABLE 13
#define COMMAND_LIST 14
#define COMMAND_QUERY_DATETIME 15
#define COMMAND_QUERY_EXISTS 16
#define COMMAND_QUERY_HANDLE 17
#define COMMAND_QUERY_SEEK 18
#define COMMAND_QUERY_SIZE 19
#define COMMAND_QUERY_STREAMTYPE 20
#define COMMAND_QUERY_TIMESTAMP 21
#define COMMAND_QUERY_POSITION 23
#define COMMAND_QUERY 24
#define COMMAND_QUERY_POSITION_READ 25
#define COMMAND_QUERY_POSITION_WRITE 26
#define COMMAND_QUERY_POSITION_CHAR 27
#define COMMAND_QUERY_POSITION_LINE 28
#define COMMAND_QUERY_POSITION_SYS 29
#define COMMAND_OPEN 30
#define COMMAND_OPEN_READ 31
#define COMMAND_OPEN_WRITE 32
#define COMMAND_OPEN_BOTH 33
#define COMMAND_OPEN_BOTH_APPEND 34
#define COMMAND_OPEN_BOTH_REPLACE 35
#define COMMAND_OPEN_WRITE_APPEND 36
#define COMMAND_OPEN_WRITE_REPLACE 37
#define COMMAND_POSITION 38
/*
* Define TRUE_TRL_IO, if you want the I/O system to be even more like
* TRL. It will try to mimic the behaviour in TRL exactly. Note that if
* you _do_ define this, you might experience a degrade in runtime
* performance.
*/
#define TRUE_TRL_IO
/*
* There are two ways to report an error for file I/O operations. Either
* as an "error" or as a "warning". Both will raise the NOTREADY
* condition, but only ERROR will actually put the file into ERROR mode.
* Warnings are used for e.g. EOF while reading. Both are implemented
* by the same routine.
*/
#define file_error(a,b,c) handle_file_error(a,b,c,1)
#define file_warning(a,b,c) handle_file_error(a,b,c,0)
/*
* Which character is used to delimit lines in text files? Actually,
* this should have been a bit more general, since the use of LF as
* EOL-marker is a bit Unix-ish. We have to change this before porting
* to other platforms.
*/
#define EOL (0x0a)
#define CR (0x0d)
/*
* Regina truncates a file when repositioning by the use of a line
* count. That is, if the file has ten lines, and you use the BIF
* lineout(file,,4), it will be truncated after the fourth line.
* Truncating is not performed for character repositioning.
*
* If you don't want truncating after line repositioning, undefine
* the macro HAVE_FTRUNCATE in config.h. Also, if your system doesn't
* have ftruncate(), undefine HAVE_FTRUNCATE, and survive without the
* truncating.
*
* The function ftruncate() is a BSDism; if you have trouble finding
* it, try linking with -lbsd or -lucb or something like that. Since
* it is not a standard POSIX feature, some machines may generate
* warnings during compilation. Let's help these machines ...
*/
#if defined(FIX_PROTOS) && defined(HAVE_FTRUNCATE)
# if defined(ultrix)
int ftruncate( int fd, int length ) ;
# endif
#endif
/*
* Since development of Ultrix has ceased, and they never managed to
* fix a few things, we want to define a few things, just in order
* to kill a few warnings ...
*/
#if defined(FIX_PROTOS) && defined(FIX_ALL_PROTOS) && defined(ultrix)
int fstat( int fd, struct stat *buf ) ;
int stat( char *path, struct stat *buf ) ;
#endif
/*
* Here comes another 'sunshine-story' ... Since SunOS don't have
* a decent set of include-files in the standard version of the OS,
* their <stdio.h> don't define these macros. Instead, Sun seems to
* survive with the old custom of using the numberic values of these
* macros directly. If compiled with "SunKlugdes" defined, try to
* fix this.
*
* If you are using gcc on a Sun, you may want to run the program
* fixincludes that comes with gcc. It will fix this more permanently.
* At least one recent version of GCC for VMS doesn't have this
*/
#if defined(SunKludges) || (defined(__GNUC__) && defined(VMS))
# define SEEK_SET 0
# define SEEK_CUR 1
# define SEEK_END 2
#endif
/*
* Some machines don't defined these ... they should!
*/
#if defined(VMS) || defined(_MSC_VER)
# define F_OK 0
# define X_OK 1
# define W_OK 2
# define R_OK 4
#endif
/*
* Here is the datastructure in which to store the information about
* open files. The storage format of the file table is discussed
* elsewhere. The fields used to handle storing are 'next' and 'prev'
* which is used to implement a double linked list of files having
* the same hashfunc; and 'newer' and 'older' which are used to maintain
* a large double linked list of all files in order of the most
* recently used file.
*
* The other fields are:
*
* fileptr - Pointer to the filehandle use by the system when
* accessing the file through the normal I/O calls.
* If this pointer is NULL, it means that the file is
* not currently open.
* oper - Holds the value that tells whether the most recent
* operation on this file was a read or a write. This has
* importance for flushing, since a read can't imediately
* follow a write (or vice versa) without a flush (or
* a repositioning) inbetween. Takes the values OPER_READ,
* OPER_WRITE or OPER_NONE (signalizes that most recent
* operation can be followed by either read or write).
* flag - Bitfield that holds information about the file. The
* significance of the various fields are described by
* the FLAG_* macros.
* error - Most recently 'errno' code for this file. It could have
* been stored into 'errmsg' instead, but that would require
* copying of data which might not be used. If undefined,
* it will have the value 0.
* readpos - The current read position in the file, as a character
* position. Note that this is in 'C-syntax', i.e. the
* first character in the file is numbered "0". A value of
* -1 means that the value is unknown or undefined.
* readline - The line number of the current read position, which must
* be positive if define. A value of zero means that the
* line number is undefined or unknown. If current read
* position is at an EOL, 'readline' refers to the line
* preceding the EOL.
* writepos - Similar to 'readpos' but for current write position.
* writeline - Similar to 'readline' but for current write position.
* filename - Pointer to string containing the filename assiciated
* with this file. This string is garanteed to have an
* ASCII NUL following the last character, so it can be
* used directly in file operations. This field *must*
* be defined.
* errmsg - Error message associated with the file. Some errors are
* not trapped during call to system routines, and these
* does not have an error message defined by the opsys.
* E.g. when positioning current read position after EOF.
* This field stores errormessages for these situations.
* If undefined, it will be a NULL pointer.
*
* Both errmsg and error can not be defined simultaneously.
*/
typedef struct fileboxtype *fileboxptr ;
typedef struct fileboxtype {
FILE *fileptr ;
unsigned char oper ;
size_t readpos, writepos, thispos ;
int flag, error, readline, writeline, linesleft ;
fileboxptr prev, next, newer, older ;
streng *filename ;
streng *errmsg ;
} filebox ;
/*
* The following two pointers are pointers into the doble linked list
* of all files in the file table. They points to the most recently
* used file, and the least recently used open file. Note that the latter
* of these are _not_ the same as the last file in the list. If the
* Rexx' file table contains more files than the system's file table
* can contain, 'lrufile' will point to the last open file in the double
* linked list. Files further out in the list are 'swapped' out.
*/
static fileboxptr mrufile=NULL ;
static fileboxptr swappoint=NULL ;
static void handle_file_error(fileboxptr, int, char*, int ) ;
void closefile( streng *name ) ;
/*
* Marks all entries in the filetable. Used only by the memory
* management. Does not really change anything, so you can in general
* forget this one. This routine is called from memory.c in order to
* mark all statically defined data in this file.
*/
#ifdef TRACEMEM
void *rdarea=NULL ;
void mark_filetable( void )
{
fileboxptr ptr=NULL ;
for (ptr=mrufile; ptr; ptr=ptr->older)
{
markmemory( ptr, TRC_FILEPTR ) ;
markmemory( ptr->filename, TRC_FILEPTR ) ;
if (ptr->errmsg)
markmemory( ptr->errmsg, TRC_FILEPTR ) ;
}
if (rdarea)
markmemory( rdarea, TRC_FILEPTR ) ;
}
#endif /* TRACEMEM */
/*
* This command maps the string 'cmd' into a number which is to be
* interpreted according to the settings of the COMMAND_ macros.
* The input strings must be one of the valid command, or else the
* COMMAND_NONE value is returned.
*
* Well, this routine should really have been implemented differently,
* since sequential searching through a list of strings is not very
* efficient. But still, it is not so many entries in the list, and
* this function is not going to be called often, so I suppose it
* doesn't matter too much. Ideallistic, it should be rewritten to
* a binary search.
*/
char get_command( streng *cmd )
{
char *cptr=NULL ;
for (cptr=cmd->value; cptr<cmd->value+cmd->len; cptr++)
if (islower(*cptr))
*cptr = toupper(*cptr) ;
if (cmd->len==4 && !memcmp(cmd->value, "READ", 4))
return COMMAND_READ ;
if (cmd->len==5 && !memcmp(cmd->value, "WRITE", 5))
return COMMAND_WRITE ;
if (cmd->len==6 && !memcmp(cmd->value, "APPEND", 6))
return COMMAND_APPEND ;
if (cmd->len==6 && !memcmp(cmd->value, "UPDATE", 6))
return COMMAND_UPDATE ;
if (cmd->len==6 && !memcmp(cmd->value, "CREATE", 6))
return COMMAND_CREATE ;
if (cmd->len==5 && !memcmp(cmd->value, "CLOSE", 5))
return COMMAND_CLOSE ;
if (cmd->len==5 && !memcmp(cmd->value, "FLUSH", 5))
return COMMAND_FLUSH ;
if (cmd->len==6 && !memcmp(cmd->value, "STATUS", 6))
return COMMAND_STATUS ;
if (cmd->len==5 && !memcmp(cmd->value, "FSTAT", 5))
return COMMAND_FSTAT ;
if (cmd->len==5 && !memcmp(cmd->value, "RESET", 5))
return COMMAND_RESET ;
if (cmd->len==8 && !memcmp(cmd->value, "READABLE", 8))
return COMMAND_READABLE ;
if (cmd->len==8 && !memcmp(cmd->value, "WRITABLE", 8))
return COMMAND_WRITEABLE ;
if (cmd->len==10 && !memcmp(cmd->value, "EXECUTABLE", 10))
return COMMAND_EXECUTABLE ;
if (cmd->len==4 && !memcmp(cmd->value, "LIST", 4))
return COMMAND_LIST ;
if (cmd->len>=4 && !memcmp(cmd->value, "OPEN", 4))
return COMMAND_OPEN ;
if (cmd->len>=5 && !memcmp(cmd->value, "QUERY", 5))
return COMMAND_QUERY ;
else
return COMMAND_NONE ;
}
char get_querycommand( streng *cmd )
{
if (cmd->len==8 && !memcmp(cmd->value, "DATETIME", 8))
return COMMAND_QUERY_DATETIME ;
if (cmd->len==6 && !memcmp(cmd->value, "EXISTS", 6))
return COMMAND_QUERY_EXISTS ;
if (cmd->len==6 && !memcmp(cmd->value, "HANDLE", 6))
return COMMAND_QUERY_HANDLE ;
if (cmd->len>=4 && !memcmp(cmd->value, "SEEK", 4))
return COMMAND_QUERY_SEEK ;
if (cmd->len>=8 && !memcmp(cmd->value, "POSITION", 8))
return COMMAND_QUERY_POSITION ;
if (cmd->len==4 && !memcmp(cmd->value, "SIZE", 4))
return COMMAND_QUERY_SIZE ;
if (cmd->len==10 && !memcmp(cmd->value, "STREAMTYPE", 10))
return COMMAND_QUERY_STREAMTYPE ;
if (cmd->len==9 && !memcmp(cmd->value, "TIMESTAMP", 9))
return COMMAND_QUERY_TIMESTAMP ;
else
return COMMAND_NONE ;
}
char get_querypositioncommand( streng *cmd )
{
if (cmd->len==4 && !memcmp(cmd->value, "READ", 4))
return COMMAND_QUERY_POSITION_READ ;
if (cmd->len==5 && !memcmp(cmd->value, "WRITE", 5))
return COMMAND_QUERY_POSITION_WRITE ;
if (cmd->len==4 && !memcmp(cmd->value, "CHAR", 4))
return COMMAND_QUERY_POSITION_CHAR ;
if (cmd->len==4 && !memcmp(cmd->value, "LINE", 4))
return COMMAND_QUERY_POSITION_LINE ;
if (cmd->len==3 && !memcmp(cmd->value, "SYS", 3))
return COMMAND_QUERY_POSITION_SYS ;
else
return COMMAND_NONE ;
}
char get_opencommand( streng *cmd )
{
if (cmd->len>=4 && !memcmp(cmd->value, "BOTH", 4))
return COMMAND_OPEN_BOTH ;
if (cmd->len==4 && !memcmp(cmd->value, "READ", 4))
return COMMAND_OPEN_READ ;
if (cmd->len>=5 && !memcmp(cmd->value, "WRITE", 5))
return COMMAND_OPEN_WRITE ;
else
return COMMAND_OPEN_BOTH ;
}
char get_opencommandboth( streng *cmd )
{
if (cmd->len==6 && !memcmp(cmd->value, "APPEND", 6))
return COMMAND_OPEN_BOTH_APPEND ;
if (cmd->len==7 && !memcmp(cmd->value, "REPLACE", 7))
return COMMAND_OPEN_BOTH_REPLACE ;
if (cmd->len==0)
return COMMAND_OPEN_BOTH ;
else
return COMMAND_NONE ;
}
char get_opencommandwrite( streng *cmd )
{
if (cmd->len==6 && !memcmp(cmd->value, "APPEND", 6))
return COMMAND_OPEN_WRITE_APPEND ;
if (cmd->len==7 && !memcmp(cmd->value, "REPLACE", 7))
return COMMAND_OPEN_WRITE_REPLACE ;
if (cmd->len==0)
return COMMAND_OPEN_WRITE ;
else
return COMMAND_NONE ;
}
/* ==================================================================== */
/* level 3 routines */
/*
* Returns the fileboxptr of a file, if is has already been opened.
* If it does not exist in Rexx's file table, a NULL pointer is
* returned in stead. It is easy to change the datastruction in
* which the file table is stored.
*
* If using VMS, or another opsys that has a caseinsensitive file
* system, maybe it should disregard the case of the filename. In
* general, maybe it should 'normalize' the file name before storing
* it in the file table (do we sence an upcoming namei() :-)
*/
static fileboxptr filehash[128] = { NULL } ;
int filehashvalue( streng *name )
{
char *cptr=NULL, *endp=NULL ;
int value=0 ;
assert( name ) ;
cptr = name->value ;
endp = cptr + name->len ;
for (; cptr<endp; value += *(cptr++)) ;
return (value%128) ;
}
void removefileptr( fileboxptr ptr )
{
if (swappoint == ptr)
swappoint = ptr->newer ;
if (mrufile==ptr)
mrufile = ptr->older ;
if (ptr->older)
ptr->older->newer = ptr->newer ;
if (ptr->newer)
ptr->newer->older = ptr->older ;
if (ptr->next)
ptr->next->prev = ptr->prev ;
if (ptr->prev)
ptr->prev->next = ptr->next ;
else
filehash[filehashvalue(ptr->filename)] = ptr->next ;
}
void enterfileptr( fileboxptr ptr )
{
int hashval=0 ;
/*
* First, get the magic number for this file. Note that when we're
* doing hashing like this, we *may* get trouble on machines that
* don't differ between upper and lower case letters in filenames.
*/
hashval = filehashvalue(ptr->filename) ;
/*
* Then, link it into the list of values having the same hashvalue
*/
ptr->next = filehash[hashval] ;
if (ptr->next)
ptr->next->prev = ptr ;
filehash[hashval] = ptr ;
ptr->prev = NULL ;
/*
* Then, link it into the 'global' list of files, sorted by how
* recently they have been used.
*/
ptr->older = mrufile ;
if (ptr->older)
ptr->older->newer = ptr ;
ptr->newer = NULL ;
mrufile = ptr ;
if (!swappoint)
swappoint = ptr ;
}
void swapout_file( void )
{
/*
* Too many open files simultaneously, we have to close one down
* in order to free one file descriptor, but only if there actually
* are some files that can be closed down.
*/
nextfile:
if (swappoint==NULL)
{
swappoint = mrufile ;
for (; swappoint && swappoint->older; swappoint=swappoint->older) ;
}
if (swappoint==NULL)
exiterror( ERR_SYSTEM_FAILURE, 0 ) ;
if ((swappoint->flag & FLAG_SURVIVOR) ||
(swappoint->flag & FLAG_SWAPPED) ||
(swappoint->fileptr==NULL ))
{
swappoint = swappoint->newer ;
goto nextfile ;
}
errno = 0 ;
if (fclose( swappoint->fileptr )==EOF)
exiterror( ERR_SYSTEM_FAILURE, 0 ) ;
swappoint->fileptr = NULL ;
swappoint->flag |= FLAG_SWAPPED ;
swappoint->thispos = EOF ;
swappoint = swappoint->newer ;
}
static char *acc_mode[] = { "rb", "r+b", "ab" } ;
#define ACCMODE_READ 0
#define ACCMODE_RDWRT 1
#define ACCMODE_WRITE 2
#define ACCMODE_NONE 3
void swapin_file( fileboxptr ptr )
{
int faccess=0, itmp=0 ;
/*
* First, just try to reopen the file, we _might_ have a vacant
* entry in the system file table, so, use that.
*/
itmp = (ptr->flag & (FLAG_READ | FLAG_WRITE)) ;
if (itmp==(FLAG_READ | FLAG_WRITE))
faccess = ACCMODE_RDWRT ;
else if (itmp==(FLAG_READ))
faccess = ACCMODE_READ ;
else if (itmp==(FLAG_WRITE))
faccess = ACCMODE_WRITE ;
else
faccess = ACCMODE_NONE ;
if (faccess == ACCMODE_NONE)
exiterror( ERR_INTERPRETER_FAILURE, 0 ) ;
tryagain:
#ifdef SGIkludges
errno = EMFILE ;
#else
errno = 0 ;
#endif
ptr->fileptr = fopen( ptr->filename->value, acc_mode[faccess] ) ;
if ((!ptr->fileptr) && (errno == EMFILE))
{
swapout_file() ;
goto tryagain ;
}
ptr->flag &= ~(FLAG_SWAPPED) ;
if (ptr->fileptr==NULL)
file_error( ptr, errno, NULL ) ;
else
fseek( ptr->fileptr, 0, SEEK_SET ) ;
ptr->thispos = 0 ;
ptr->readline = ptr->writeline = 0 ;
ptr->linesleft = 0 ;
}
fileboxptr getfileptr( streng *name )
{
fileboxptr ptr=0 ;
/*
* First, try to find the correct file in this sloth of the
* hash table. If one is found, ptr points to it, else, ptr is set
* to NULL
*/
for (ptr=filehash[filehashvalue(name)];ptr;ptr=ptr->next)
if (!Str_cmp(name,ptr->filename))
break ;
/*
* In order not to create any problems later, just return with NULL
* (signifying that no file was found) if that is the case. Then we may
* able to assume that ptr _is_ set later.
*/
if (!ptr)
return NULL ;
/*
* Now, put the file in front of the list of files storted by how
* recently they were used. We assume that any access to a file is
* equivalent to the file being used.
*/
if (ptr->newer)
{
if (swappoint==ptr)
swappoint = ptr->newer ;
ptr->newer->older = ptr->older ;
if (ptr->older)
ptr->older->newer = ptr->newer ;
ptr->older = mrufile ;
ptr->newer = NULL ;
mrufile->newer = ptr ;
mrufile = ptr ;
}
/*
* If this file has been swapped out, we have to reopen it, so we can
* continue to access it. First we verify that swappoint is set; if it
* isn't that means that
*/
if (ptr->flag & FLAG_SWAPPED)
swapin_file( ptr ) ;
return ptr ;
}
void flush_input( fileboxptr ptr )
{
return ;
}
/*
* This closes the file ... actually, I'm not sure whether that is the
* correct thing to do, but lots of other rexx interpreters seem to do
* exactly that. Maybe a feature for the 'traditional' mode?
*/
void flush_output( streng *ptr )
{
closefile( ptr ) ;
return ;
}
/*
* Sets up the internal filetable for REXX, and initializes it with
* the three standard files under Unix, stderr, stdout og and stdin.
* Should only be called once, from the main routine. We should also
* add code to register the routine for marking memory from this
* routine.
*
* As a shortcut to access these three default files, there is a
* variable 'stdio_ptr' which contains pointers to them. This allows
* for quick access to the default streams.
*/
static fileboxptr stdio_ptr[3] ;
void initfiletable( void )
{
int i=0 ;
for (i=0; i<3; i++)
{
stdio_ptr[i] = Malloc( sizeof( filebox )) ;
stdio_ptr[i]->errmsg = NULL ;
stdio_ptr[i]->error = 0 ;
}
stdio_ptr[0]->fileptr = stdin ;
stdio_ptr[1]->fileptr = stdout ;
stdio_ptr[2]->fileptr = stderr ;
stdio_ptr[0]->flag = ( FLAG_SURVIVOR + FLAG_READ ) ;
stdio_ptr[1]->flag = ( FLAG_SURVIVOR + FLAG_WRITE ) ;
stdio_ptr[2]->flag = ( FLAG_SURVIVOR + FLAG_WRITE ) ;
stdio_ptr[0]->filename = Str_cre( "<stdin>" ) ;
stdio_ptr[1]->filename = Str_cre( "<stdout>" ) ;
stdio_ptr[2]->filename = Str_cre( "<stderr>" ) ;
enterfileptr( stdio_ptr[0] ) ;
enterfileptr( stdio_ptr[1] ) ;
enterfileptr( stdio_ptr[2] ) ;
}
/*
* Sets the proper error conditions for the file, including providing a
* a hook into the CALL/SIGNAL ON system. Now, we also like to set some
* other information, like the status of the file (taken from rc).
*
* First parameter is the file to operate on, the second and third
* parameters are the error message to set (they can't both be defined),
* and the last parameter is the level of 'severity'. If set, the file
* is thrown into error state.
*/
static void handle_file_error(fileboxptr ptr, int rc, char *errmsg, int level)
{
trap *traps=NULL ;
extern proclevel currlevel ;
assert( !(rc && errmsg) ) ;
if ((ptr->flag & FLAG_ERROR) && (ptr->flag & FLAG_FAKE))
{
/*
* If we are faking for this file already, don't bother to do anything
* more. In particular, we do not want to set a new error, since that
* will in general only overwrite the old (and probably more relevant)
* error message. However, faking are _only_ done when NOTREADY is
* being trapped.
*/
return ;
}
else
{
/*
* If the file is not already in error, set the ERROR flag, and record
* the error message. Also, clear the FAKE flag. This flag is only
* defined when the ERROR flag is set, and we don't want any old
* values laying around (it will be set later if needed).
*/
if (level)
{
ptr->flag &= ~FLAG_FAKE ;
ptr->flag |= FLAG_ERROR ;
}
/*
* Set the error message, but only if one was given. This routine
* can be called _without_ any errormessage, and if so, keep the
* old one (if any)
*/
if (rc || errmsg)
{
if (ptr->errmsg)
Free_string( ptr->errmsg ) ;
ptr->error = rc ;
if (errmsg)
ptr->errmsg = Str_cre( errmsg ) ;
else
ptr->errmsg = NULL ;
}
/*
* OK, the file has been put into ERROR state, now we must check
* to see if we should raise the NOTREADY condition. If NOTREADY
* is not currently enabled, don't bother to try to raise it.
*/
traps = gettraps( currlevel ) ;
if (traps[SIGNAL_NOTREADY].on_off)
{
/*
* The NOTREADY condition is being trapped; set the FAKE flag
* so that we don't create more errors for this file. But _only_
* set the FAKE flag if NOTREADY is trapped by method CALL.
* Then raise the condition ...
*/
if (!traps[SIGNAL_NOTREADY].invoked)
ptr->flag |= FLAG_FAKE ;
condition_hook(SIGNAL_NOTREADY,rc+100,-1,Str_dup(ptr->filename));
}
}
}
/*
* This routine is supposed to be called when the condition is triggered
* by method CALL. From the time the condition is raised until the CALL is
* is triggered, I/O to the file is faked. But before the condition handler
* is called, we try to tidy things up a bit.
*
* At least, we have to clear the FAKE flag. Other 'nice' things to do
* is to clear error indicator in the file pointer, and to reset the
* file in general. The ERROR state is not cleared, _unless_ the file
* is one of the default streams.
*/
void fixup_file( streng *filename )
{
fileboxptr ptr=NULL ;
ptr = getfileptr( filename ) ;
if (ptr)
{
/*
* If the file is open, try to clear it, first clear the error
* indicator, and then try to fseek() to a 'safe' point. If the
* seeking didn't work out, don't bother, it was worth a try.
*/
if (ptr->fileptr)
{
clearerr( ptr->fileptr ) ;
fseek( ptr->fileptr, 0, SEEK_SET ) ;
ptr->thispos = 0 ;
}
ptr->oper = OPER_NONE ;
if (ptr->flag & FLAG_SURVIVOR)
ptr->flag &= ~(FLAG_ERROR) ;
ptr->flag &= ~(FLAG_FAKE) ;
}
}
/*
* This is stupid ... if the file exists, but is in error mode, we
* shall not close it, but leave it open, so that the rest of the
* operations on this file in this statement don't trip. Same happens
* if we are not able to close it properly. Oh well ...
*
* On second thoughts ... Faking only applies for input and output.
* So closing doesn't have to be faked. Remove the file, whatever
* happens.
*/
void closefile( streng *name )
{
fileboxptr ptr=NULL ;
/* If it isn't open, don't try to close it ... */
ptr = getfileptr( name ) ;
if (ptr)
{
/*
* If this is one of the default streams, don't let it be closed.
* These file shall stay open, whatever happens.
*/
if (ptr->flag & FLAG_SURVIVOR)
return ;
/*
* If the fileptr seems to point to something ... close it. We
* really don't want to leak file table sloths. Actually, we should
* check that the close was ok, and not let the fileptr go unless
* we know that it was really closed (and released for new use).
* Previously, it only closed when file was not in error. I don't
* know what is the correct action, but this seems to be the most
* sensible ...
*/
if (ptr->fileptr)
fclose( ptr->fileptr ) ;
removefileptr( ptr ) ;
if (ptr->errmsg)
Free_string( ptr->errmsg ) ;
Free_string( ptr->filename ) ;
Free( ptr ) ;
}
}
/*
* This function is called when we need some kind of access to a file
* but don't (yet) have it. It will only be called when we want to
* open a file implicitly, e.g. it is open for reading, and it has then
* been named in a output function.
*
* This is rather primitive ... but this function can only be called
* when the file is open for read, and we want to open it for write;
* or if the file i open for write, and we want to open it for read.
* So I think this will suffice. It ignores the 'access' parameter
* And just assumes that the file must be opened in both read and
* write.
*
* To improve on this function, we ought to do a lot more checking,
* e.g. that the 'access' wanted are required, and that the file is
* already open in some kind of mode. If this don't hold, we probably
* have an error condition.
*
* We should also check another thing, that the new file which is opened
* is in fact the same file that we closed. Perferably, we should open
* the new file, then check the device and inode of both the old and
* new file to see whether they are the same (using stat()). If they
* are not the same, the reopening should fail. As it is implemented
* now, the Unix method for temporary files (open it, remove it,
* use it, and then close it) will fail; and we loose access to the
* original file too.
*/
void reopen_file( fileboxptr ptr, int faccess )
{
if (!ptr)
exiterror( ERR_INTERPRETER_FAILURE, 0 ) ;
/*
* We can not reopen the default streams, that makes no sence. If
* tried, report an error.
*/
if (ptr->flag & FLAG_SURVIVOR)
{
file_error( ptr, 0, "Invalid operation on default stream" ) ;
return ;
}
/*
* Close the old file, and try to reopen the new file. There is the
* same problem here as in closefile(); if closing didn't work (for
* some mysterious reason), the system's file table should become
* full. Better checking might be required.
*/
errno = 0 ;
fclose( ptr->fileptr ) ;
ptr->fileptr = fopen( ptr->filename->value, "r+b" ) ;
if (ptr->fileptr==NULL)
{
file_error( ptr, errno, NULL ) ;
return ;
}
/*
* We definitively want to set the close-on-exec flag. Suppose
* an output file has not been flushed, and we execute a command.
* This might perform an exec() and then a system(), which _will_
* flush all files (close them). The result is that the file might
* be flushed twice ... not good.
*
* This don't work on VMS ... but the file system on VMS is so
* different anyway, so it will probably not create any problems.
* Besides, we don't do exec() and system() on VMS.
*/
#if !defined(VMS) && !defined(OS2) && !defined(DOS) && !defined(__WATCOMC__) && !defined(_MSC_VER) /* MH 10-06-96 */
if (ptr && ptr->fileptr)
{
int flags, fno ;
fno = fileno( ptr->fileptr ) ;
assert( fno >= -1) ;
flags = fcntl( fno, F_GETFD ) ;
flags |= FD_CLOEXEC ;
if (fcntl( fno, F_SETFD, flags)== -1)
exiterror( ERR_SYSTEM_FAILURE, 0 ) ;
}
#endif
/*
* If readposition is EOF (=illegal), then we "probably" needed to
* open it in read mode. Set the current read position to the start
* of the file.
*/
if (ptr->readpos==EOF)
{
ptr->readline = 1 ;
ptr->linesleft = 0 ;
ptr->readpos = 0 ;
ptr->thispos = 0 ;
fseek( ptr->fileptr, 0, SEEK_SET ) ;
}
/*
* Then do the same thing for write access. We always set this to the
* end-of-file -- the default -- even though there are other write
* modes available. If the file is implicitly open in write mode,
* then the current write position should be set to the default
* value.
*/
if (ptr->writepos==EOF)
{
ptr->writeline = 0 ;
fseek( ptr->fileptr, 0, SEEK_END ) ;
ptr->writepos = ftell( ptr->fileptr ) ;
ptr->thispos = ptr->writepos ;
}
/*
* Then, at last, do some simple bookkeeping, set both read and
* write access, and clear any previous problem.
*/
ptr->flag = FLAG_READ | FLAG_WRITE | FLAG_PERSIST ;
ptr->error = 0 ;
if (ptr->errmsg)
Free_string(ptr->errmsg) ;
ptr->errmsg = NULL ;
}
/*
* This function explicitly opens a file. It will be called if the user
* has called the built-in function STREAM() in order to open a file
* in a particular mode. It will also be called if the file is not
* previously open, and is used in a read or write operation.
*
* It takes two parameters, the name of the file to open, and the
* mode in which it is to be opened. The mode has a value which is
* matched by the ACCESS_ macros defined earlier.
*
* If the file is actually open in advance, then we close it before we
* do any other operations. If the user is interested in the file in
* one particular mode, he is probably not interested in any previous
* modes.
*/
fileboxptr openfile( streng *name, int faccess )
{
fileboxptr ptr=NULL ;
struct stat statbuf ;
int rc=0 ;
long lpos=0L ;
/*
* First check wether this file is already open, and use that open
* file if possible. However, that may not be possible, since we
* may want to use the file for another operation now. So, if the
* file _is_ open, check to see if access is right.
*/
ptr = getfileptr( name ) ;
if (ptr)
{
if (ptr->flag & FLAG_SURVIVOR)
{
file_error( ptr, 0, "Can't open a default stream" ) ;
return ptr ;
}
closefile( name ) ;
}
/*
* Now, get a new file table entry, and fill in the various
* field with appropriate (i.e. default) values.
*/
ptr = Malloc( sizeof(filebox) ) ;
ptr->filename = Str_ify( Str_dup( name )) ;
ptr->flag = 0 ;
ptr->error = 0 ;
ptr->errmsg = NULL ;
ptr->readline = 0 ;
ptr->linesleft = 0 ;
ptr->writeline = 0 ;
ptr->thispos = EOF ;
ptr->readpos = EOF ;
ptr->writepos = EOF ;
/*
* suppose we tried to open, but didn't manage, well, stuff it into
* the file table, we might want to retrieve information about it
* later on. _And_ we need to know about the problem if the file
* I/O is to be faked later on.
*/
enterfileptr( ptr ) ;
name = ptr->filename ;
goto try_to_open ;
kill_one_file:
swapout_file() ;
try_to_open:
/*
* In most of these, we have to check that the file opened is really
* a persistent file. We should not take that for granted.
*/
errno = 0 ;
if (faccess==ACCESS_READ)
{
if ((ptr->fileptr = fopen( name->value, "rb" )))
{
ptr->flag = FLAG_READ | FLAG_PERSIST ;
ptr->readline = 1 ;
ptr->linesleft = 0 ;
ptr->thispos = ptr->readpos = 0 ;
}
else if (errno==EMFILE)
goto kill_one_file ;
else
file_error( ptr, errno, NULL ) ;
}
else if (faccess==ACCESS_WRITE)
{
/*
* This is really a problem. If opened in mode "w", it will
* truncate the file if it did exist. If opened int mode "r+",
* it will fail if the file did not exist. So we try to
* combine the two.
*/
ptr->flag = FLAG_READ ;
ptr->fileptr = fopen( name->value, "r+b" ) ;
errno = 0 ;
if (!ptr->fileptr)
ptr->fileptr = fopen( name->value, "w+b" ) ;
errno = 0 ;
if (!ptr->fileptr)
{
#ifdef SGIkludges
errno = EMFILE ;
#else
errno = 0 ;
#endif
ptr->fileptr = fopen( name->value, "wb" ) ;
ptr->flag &= 0 ;
}
/*
* Then set the current read and write positions to the start and
* the end of the file, respectively.
*/
if (ptr->fileptr)
{
ptr->flag |= FLAG_WRITE | FLAG_PERSIST ;
fseek( ptr->fileptr, 0, SEEK_END ) ;
lpos = ftell( ptr->fileptr ) ;
ptr->thispos = ptr->writepos = lpos ;
ptr->writeline = 0 ;
ptr->readpos = 0 ;
ptr->readline = 1 ;
ptr->linesleft = 0 ;
}
else if (errno==EMFILE)
goto kill_one_file ;
else
file_error( ptr, errno, NULL ) ;
}
else if (faccess==ACCESS_APPEND)
{
/*
* In append mode, the file is opened as a transient file, all
* writing must be done at the end of the file. It is not
* possible to perform reading on the file. Useful for files
* to which you have write, but not read access (e.g. logfiles).
*/
if ((ptr->fileptr = fopen( name->value, "ab" )))
{
ptr->flag = FLAG_WRITE | FLAG_WREOF ;
}
else if (errno==EMFILE)
goto kill_one_file ;
else
file_error( ptr, errno, NULL ) ;
}
else if (faccess==ACCESS_STREAM_APPEND)
{
/*
* In "stream" append mode, the file is opened as a persistent file, all
* writing must be done at the end of the file. It is not
* possible to perform reading on the file. Useful for files
* to which you have write, but not read access (e.g. logfiles).
*/
if ((ptr->fileptr = fopen( name->value, "ab" )))
{
ptr->flag = FLAG_WRITE | FLAG_WREOF | FLAG_PERSIST;
fseek( ptr->fileptr, 0, SEEK_END ) ;
lpos = ftell( ptr->fileptr ) ;
ptr->thispos = ptr->writepos = lpos ;
ptr->writeline = 0 ;
ptr->readpos = 0 ;
ptr->readline = 1 ;
ptr->linesleft = 0 ;
}
else if (errno==EMFILE)
goto kill_one_file ;
else
file_error( ptr, errno, NULL ) ;
}
else if (faccess==ACCESS_STREAM_REPLACE)
{
/*
* The file is created if it didn't exist, and if it did exist
* it is truncated and the file pointers set to the start of file.
*/
if ((ptr->fileptr = fopen( name->value, "w+b" )))
{
ptr->flag = FLAG_WRITE | FLAG_READ | FLAG_WREOF | FLAG_RDEOF |
FLAG_PERSIST ;
ptr->writeline = ptr->readline = 1 ;
ptr->linesleft = 0 ;
ptr->readpos = ptr->writepos = ptr->thispos = 0 ;
}
else if (errno==EMFILE)
goto kill_one_file ;
else
file_error( ptr, errno, NULL ) ;
}
else if (faccess==ACCESS_UPDATE)
{
/*
* Like read access, but it will not create the file if it didn't
* already exist. Instead, an error is reported.
*/
if ((ptr->fileptr = fopen( name->value, "r+b" )))
{
ptr->flag = FLAG_WRITE | FLAG_READ | FLAG_PERSIST ;
ptr->readline = 0 ;
ptr->linesleft = 0 ;
ptr->writeline = 0 ;
}
else if (errno==EMFILE)
goto kill_one_file ;
else
file_error( ptr, errno, NULL ) ;
}
else if (faccess==ACCESS_CREATE)
{
/*
* The file is created if it didn't exist, and if it did exist
* it is truncated.
*/
if ((ptr->fileptr = fopen( name->value, "w+b" )))
{
ptr->flag = FLAG_WRITE | FLAG_READ | FLAG_WREOF | FLAG_RDEOF |
FLAG_PERSIST ;
ptr->writeline = ptr->readline = 1 ;
ptr->linesleft = 0 ;
ptr->readpos = ptr->writepos = ptr->thispos = 0 ;
}
else if (errno==EMFILE)
goto kill_one_file ;
else
file_error( ptr, errno, NULL ) ;
}
else
exiterror( ERR_INTERPRETER_FAILURE, 0 ) ;
#if !defined(VMS) && !defined(OS2) && !defined(DOS) && !defined(__WATCOMC__) && !defined(_MSC_VER) /* MH 10-06-96 */
/*
* Then we check to see if this is a transient or persistent file.
* We can remove a 'persistent' setting, but add one, since we
* sometimes want to access a persistent file as transient (append).
*/
if (ptr->fileptr)
{
int fno ;
errno = 0 ;
fno = fileno(ptr->fileptr) ;
rc = fstat( fno, &statbuf ) ;
if (rc==0 && !S_ISREG(statbuf.st_mode))
ptr->flag &= ~(FLAG_PERSIST) ;
else if (rc!=0)
file_error( ptr, errno, NULL ) ;
}
/*
* As with reopen_file(), we want to set the close-on-exec flag,
* se reopen_file for more information.
*/
if (ptr->fileptr)
{
int flags, fno ;
fno = fileno(ptr->fileptr) ;
assert( fno >= -1) ;
flags = fcntl( fno, F_GETFD ) ;
flags |= FD_CLOEXEC ;
if (fcntl( fno, F_SETFD, flags)== -1)
exiterror( ERR_SYSTEM_FAILURE, 0 ) ;
}
#endif
return (ptr) ;
}
/* ------------------------------------------------------------------- */
/* High level utility routines */
/*
* This function is really just an interface to the function getfileptr().
* It takes a (possible) filename, and retrieves the corresponding
* Rexx file table entry. If the file does not exist, it is opened in
* the mode indicated by 'open_mode'. If it does exist, this routine
* verifies that it it has been opened in a mode corresponding to
* 'access' (OPER_READ or OPER_WRITE).
*
* If the file does not exist, it is opened in either normal read
* or normal write. This correcspinds to an "implicit" file open
* in Rexx.
*/
fileboxptr get_file_ptr( streng *name, int faccess, int open_mode )
{
fileboxptr ptr=NULL ;
ptr = getfileptr( name ) ;
if (ptr==NULL)
return openfile( name, open_mode ) ;
if (ptr->flag & FLAG_ERROR)
return ptr ;
if (faccess==OPER_READ && (!(ptr->flag & FLAG_READ)))
reopen_file( ptr, ACCESS_READ ) ;
else if (faccess==OPER_WRITE && (!(ptr->flag & FLAG_WRITE)))
reopen_file( ptr, ACCESS_WRITE ) ;
return ptr ;
}
/*
* This routine reads one complete line from the file indicated by
* the file table entry 'ptr'. Or rather, it read from the current
* read position, until and including the first EOL mark, and returns
* that. If the EOL mark is implemented as certain characters, they are
* not returned. It closely corresponds to the LINEIN() built-in
* function.
*
* What is the upper limit for the size that we might read in? It's
* best not to have any limit, so the method is the following: A
* temporary area is used for storing the data read from the file.
* We never know the size needed until the EOL mark is found. So
* just read the data into the temporary area. If the EOL is found,
* then we know the size, and we can transfer the data into a 'streng'
* of suitable size. If the temporary area is too small, allocate
* an area twice the size, and copy the data over. Afterwards, keep the
* new area as the temporary area.
*
* This way, be normally use little memory, but we are still able to
* read as large lines as the memory allows, if it is needed.
*/
streng *readoneline( fileboxptr ptr )
{
int i=0, j=0, k=0, eolf=0, eolchars=1 ;
streng *ret=NULL ;
static int size=0 ;
static char *string=NULL ;
/*
* First verify that we actually have a file that is not in an
* ERROR state. If so, don't perform any operations.
*/
if ( ptr->flag & FLAG_ERROR )
{
if (!(ptr->flag & FLAG_FAKE))
file_error( ptr, 0, NULL ) ;
return nullstringptr() ;
}
/*
* If the string is not yet allocated, allocate it, and use an
* initial size of 512 bytes. This can be increased during runtime.
*/
if (!string)
{
string = Malloc( (size=5120) ) ;
#ifdef TRACEMEM
rdarea = string ;
#endif
}
/*
if (ptr->fileptr==stdin)
fcntl( stdin, F_SETFL, O_NONBLOCK | fcntl(stdin,F_GETFL)) ;
*/
errno = 0 ;
for (i=0; ; i++)
{
j = getc(ptr->fileptr);
if (j == EOL)
{
eolf = EOL;
break;
}
#if !defined(UNIX)
if (j == CR)
{
k = getc(ptr->fileptr);
if (k == EOL)
{
eolf = EOL;
eolchars = 2;
break;
}
else
{
ungetc(k,ptr->fileptr);
eolf = EOL;
break;
}
}
#endif
/*
* If we hit end-of-file, handle it carefully, and terminate the
* reading. Note that this means that there we have read an
* incomplete last line, so return what we've got, and report
* an NOTREADY condition. (Partly, I disagree, but this is how
* TRL defines it ... Case I: Programmer using Emacs forgets to
* add a EOL after the last line; Rexx triggers NOTREADY when
* reading that last, incomplete line.
*/
if (j==EOF)
{
ptr->flag |= FLAG_RDEOF ;
file_warning( ptr, 0, "EOF on line input" ) ;
break ;
}
/*
* We are trying to avoid any limits other than memory-imposed
* limits. So if the buffer size that we currently have are too
* small, double it, and hide the operation from the rest of the
* interpreter.
*/
if (i>=size)
{
char *tmpstring ;
assert( i == size ) ;
tmpstring = Malloc( 2*size+10 ) ;
memcpy( tmpstring, string, size ) ;
Free( string ) ;
string = tmpstring ;
size *= 2 ;
#ifdef TRACEMEM
rdarea = string ;
#endif
}
/*
* Just an ordinary character ... append it to the buffer
*/
string[i] = j ;
}
if (ptr->thispos != EOF)
ptr->thispos += i - (j==EOF) ;
if (ptr->readpos != EOF)
ptr->readpos = ptr->thispos ;
/*
* If we did read a complete line, we have to increment the line
* count for the current read pointer of this file. This part of
* the code is a bit Unix-ish. It will have to be reworked for
* other types of operating systems.
*/
if ((eolf==EOL) && (ptr->readline > 0))
{
ptr->readline += eolchars ; /* only if we actually saw the "\n" !!! */
if (ptr->linesleft)
ptr->linesleft-- ;
}
/*
* Wrap up the data that was read, and return it as a 'streng'.
*
*/
/* if (i>1000) i = 1000 ; */
ret = Str_make( i ) ;
memcpy( ret->value, string, ret->len=i ) ;
return ret ;
}
/*
* This routine will position the current read or write position
* of a file, to the start of a particular line. The file to be
* operated on is 'ptr', the pointer to manipulate is indicated
* by 'oper' (either OPER_READ or OPER_WRITE), and the linenumber
* to position at is 'lineno'.
*
* There are (at least) two ways to do the backup of the current
* position in the file. First to backup to the start of the file
* and then to seek forward, or to seek backwards from the current
* position of the file.
*
* Perhaps the first is best for the standard case, and the second
* should be activated when the line-parameter is negative ... ?
*/
void positionfile( fileboxptr ptr, int oper, int lineno )
{
int ch=0x00 ;
int from_line=0, old_errno=0, tmp=0 ;
long from_char=0L ;
/*
* If file is in ERROR state, don't touch it.
*/
if (ptr->flag & FLAG_ERROR)
{
if (!(ptr->flag & FLAG_FAKE))
file_error( ptr, 0, NULL ) ;
return ;
}
/*
* If this isn't a persistent file, then report an error. We can only
* perform repositioning in persistent files.
*/
if (!(ptr->flag & FLAG_PERSIST ))
{
file_error( ptr, 0, "Positioning attempted for transient file" ) ;
return ;
}
/*
* If we do any repositioning, then make the old estimate of lines
* left to read invalid. This is not really needed in all cases, but
* it is a good start. And you _may_ even want to recalculate the
* number of lines left!
*/
if (ptr->linesleft>0)
ptr->linesleft = 0 ;
if (ptr->thispos == EOF)
{
errno = 0 ;
ptr->thispos = ftell( ptr->fileptr ) ;
}
/*
* So, what we are going to do depends partly on wheter we are moving
* the read or the write position of the file. We may even be as
* lucky as not to have to move anything ... :-) First we can clear
* the EOF flag, if set. Repositioning will clean up any EOF state.
*/
if (oper == OPER_READ)
ptr->flag &= ~(FLAG_RDEOF) ;
else if (oper == OPER_WRITE)
ptr->flag &= ~(FLAG_WREOF) ;
/*
* We know the line number of at most three positions in the file:
* the start of the file, the write position and the read position.
* If the file is open only for reading or writing, we know at most
* two positions. And in addition, the read and/or the write
* position may be be invalid (i.e. previous operation was
* character oriented). But at least, we know the line number of
* one position, the start of the file, which is the first line.
*
* The best method seems to be: First start with the start of file
* and then see if using the read or the write position instead is
* a better deal. There is one drawback ... we assume that all lines
* are equally long. That assumption is probably not too bad for text
* files, but it may create unnecessary overhead for 'peculiar' files
*/
from_line = 1 ;
from_char = 0 ;
/*
* First, let's check to see if we gain anything from using the
* read position instead. If the distance from the current read
* position to the wanted line (counted in number of lines) is smaller
* than the number of lines from the first line to the wanted line,
* use the current read position in stead. But only if the current
* read position is defined.
*/
if ((ptr->flag & FLAG_READ) && (ptr->readline > 0))
{
assert( ptr->readpos != EOF) ;
tmp = ptr->readline - lineno ;
if (tmp<0)
tmp = (-tmp) ;
if (tmp < (lineno - from_line))
{
from_line = ptr->readline ;
from_char = ptr->readpos ;
}
}
/*
* Then, we check to see whether we can gain even more if we use
* the current write position of the file instead.
*/
if ((ptr->flag & FLAG_WRITE) && (ptr->writeline > 0))
{
assert( ptr->writepos != EOF ) ;
tmp = ptr->writeline - lineno ;
if (tmp<0)
tmp = (-tmp) ;
if (tmp < (lineno - from_line))
{
from_line = ptr->writeline ;
from_char = ptr->writepos ;
}
}
/*
* By now, the variables from_line, and from_char should contain
* the optimal starting point from where a seek for the 'lineno'
* line in the file can start, so first, move there. An in addition,
* it should be the known position which is closest to the wanted
* line.
*/
if (from_char != ptr->thispos)
{
errno = 0 ;
if (fseek( ptr->fileptr, from_char, SEEK_SET ))
{
file_error( ptr, errno, NULL ) ;
return ;
}
ptr->thispos = from_char ;
}
assert( from_char == ftell(ptr->fileptr) ) ;
/*
* Now we are positioned at the right spot, so seek forwards or
* backwards until we reach the correct line. Actually, the method
* we are going to use may seem a bit strange at first. First we
* seek forward until we pass the line, and then we seek backwards
* until we reach the line and at the end we back up to the first
* preceding end-of-line marker. This may seem awkward, but it is
* fairly simple. And in addition, it will always position us at
* the _start_ of the wanted line.
*/
once_more:
while ((lineno>from_line)) /* seek forward */
{
for (;((ch=getc(ptr->fileptr))!=EOF)&&(ch!=EOL);from_char++) ;
if (ch==EOL)
from_line++ ;
else
break ;
}
/*
* Then we seek backwards until we reach the line. The backwards
* movement is _really_ awkward, so perhaps we should read in 512
* bytes, and analyse the data in it instead? Indeed, another
* algoritm should be chosen. Maybe later ...
*/
while (lineno<=from_line && from_char>0)
{
errno = 0 ;
if (fseek(ptr->fileptr, -1, SEEK_CUR))
{
/*
* Should this happen? Only if someone overwrites EOF chars in
* the file, but that _may_ happend ... Report error for
* any errors from the fseek and ftell. If we hit the start of
* the file, reset from_line check whether we are _below_ lineno
* If so, jump back and seek from the start (then we *must*
* start at line 1, since the data we've got are illegal).
*
* It will also happen if we are seeking backwards for the
* first line.
*/
old_errno = errno ;
errno = 0 ;
if (fseek(ptr->fileptr,0,SEEK_SET))
{
file_error( ptr, errno, NULL ) ;
return ;
}
from_line = 1 ;
ptr->thispos = 0 ;
if (from_line<lineno)
{
ptr->readline = ptr->writeline = (-1) ;
goto once_more ;
}
break ; /* we were looking for the first line ... how lucky :-) */
}
/*
* After seeking one character backwards, we must read the character
* that we just skipped over. Do that, and test whether it is
* a end-of-line character.
*/
ch = getc(ptr->fileptr) ;
if (ch==EOL)
{
if (lineno==from_line)
break ;
from_line-- ;
}
/*
* Then we move backwards once more, in order to compensate for
* reading the character. Sigh, we are really doing a lot of
* forward and backward reading, arn't we?
*/
errno = 0 ;
if (fseek(ptr->fileptr, -1, SEEK_CUR))
{
file_error( ptr, errno, NULL ) ;
return ;
}
}
/*
* Now we are almost finished. We just have to set the correct
* information in the Rexx file table entry.
*/
ptr->thispos = ftell( ptr->fileptr ) ;
if (oper == OPER_READ)
{
ptr->readline = lineno ;
ptr->readpos = ptr->thispos ;
ptr->flag &= ~(FLAG_RDEOF) ;
}
else
{
ptr->writeline = lineno ;
ptr->writepos = ptr->thispos ;
ptr->flag &= ~(FLAG_WREOF) ;
}
}
/*
* I wish every function would be as easy as this! Basically, it
* only contain simple error checking, and a direct positioning.
* it is called by the built-in function CHARIN() and CHAROUT()
* in order to position the current read or write position at the
* correct place in the file.
*/
void positioncharfile( fileboxptr fileptr, int oper, int where )
{
/*
* If the file is in state ERROR, don't touch it! Since we are not
* to return any data, don't bother about the state of FAKE.
*/
if (fileptr->flag & FLAG_ERROR)
{
if (!(fileptr->flag & FLAG_FAKE))
file_error( fileptr, 0, NULL ) ;
return ;
}
/*
* If the file is not persistent, then positioning is not allowed.
* Give the appropriate error for this.
*/
if (!(fileptr->flag & FLAG_PERSIST))
{
file_error( fileptr, 0, "File is not persistent" ) ;
return ;
}
#ifdef TRUE_TRL_IO
/*
* TRL says that positioning the read position to after the last
* character in the file, is an error. Unix allows it, and gives
* an EOF at the next reading. So, we have to handle this as a
* special case ... Check that the new position is valid.
*
* Should we give "Incorrect call to routine" when the character
* position is greater than the size of the file? Perhaps we should
* raise the NOTREADY condition instead?
*/
{
long oldp, endp ;
oldp = ftell( fileptr->fileptr ) ;
fseek(fileptr->fileptr, 0, SEEK_END) ;
endp = ftell( fileptr->fileptr ) ;
fseek( fileptr->fileptr, oldp, SEEK_SET ) ;
if ((oper==OPER_READ) && (endp<where))
{
file_error( fileptr, 0, "Repositioning at or after EOF" ) ;
return ;
}
else if ((oper==OPER_WRITE) && ((endp+1)<where))
{
file_error( fileptr, 0, "Repositioning after EOF" ) ;
return ;
}
}
#endif
/*
* Then do the actual positioning. Remember to clear errno first.
* Previously, this code tested afterwards to see if ftell()
* returned the same position that fseek() tried to set. Surly, that
* must be unnecessary?
*/
errno = 0 ;
if (fseek(fileptr->fileptr,(where-1),SEEK_SET))
{
file_error( fileptr, errno, NULL ) ;
return ;
}
/*
* Then we have to update the file pointers in the entry in our
* file table.
*
* Clear the end-of-file flag. Even if we *did* position to the
* end of file, we don't want to discover that until we actually
* _read_ data that is _off_ the end-of-file.
*/
fileptr->thispos = where-1 ;
if ((oper==OPER_READ) && (fileptr->flag & FLAG_READ))
{
fileptr->readpos = where-1 ;
fileptr->flag &= ~(FLAG_RDEOF) ;
}
else if ((oper==OPER_WRITE) && (fileptr->flag & FLAG_WRITE))
{
fileptr->writepos = where-1 ;
fileptr->flag &= ~(FLAG_WREOF) ;
}
else
file_error( fileptr, 0, NULL ) ;
/*
* And then, set the linenr field to a value signifying that we
* have no good idea about which lines are current.
*
* Since we did a fseek, we can automatically set oper to NONE.
*/
fileptr->readline = 0 ;
fileptr->writeline = 0 ;
fileptr->oper = OPER_NONE ;
}
/*
* This routine reads a string of data from a file indicated by
* the Rexx file table entry 'ptr'. The read starts at the current
* read position, and the length will be 'length' characters.
*
* Then, what if the data to be read are more than what is possible
* to store in one string; let's say length=100,000, and the size of
* length in a string is 16 bit. Well, That should return an error
* in Str_make(), but maybe we should handle it more elegantly?
*/
streng *readbytes( fileboxptr fileptr, int length )
{
int didread=0 ;
streng *retvalue=NULL ;
/*
* If state is ERROR, then refuse to handle the file further.
* If the state was 'only' EOF, then don't bother, the length of
* the file might have increased since last attempt to read.
*/
if (fileptr->flag & FLAG_ERROR)
{
if (!(fileptr->flag & FLAG_FAKE))
file_error( fileptr, 0, NULL ) ;
return nullstringptr() ;
}
assert( fileptr->flag & FLAG_READ ) ;
/*
* If we are not at the current read position, we have to
* seek to the correct position, but first we have to the validity
* of these positions.
*/
if (fileptr->flag & FLAG_PERSIST)
{
if (fileptr->thispos != fileptr->readpos)
{
errno = 0 ;
if (fseek(fileptr->fileptr, fileptr->readpos, SEEK_SET ))
{
file_error( fileptr, errno, NULL ) ;
return nullstringptr() ;
}
fileptr->thispos = fileptr->readpos ;
fileptr->oper = OPER_NONE ;
}
}
/*
* The joy of POSIX ... If a file is open for input and output, it
* must be flushed when changing between the two. Therefore, check
* the type of the last operation. Actually, this are not very likely
* since that situation would in general have been handled above.
*/
if (fileptr->oper==OPER_WRITE)
{
errno = 0 ;
if (fseek( fileptr->fileptr, 0L, SEEK_CUR ))
{
/* Hey, how could this have happened?!?! NFS down? */
file_error( fileptr, errno, NULL ) ;
return nullstringptr() ;
}
fileptr->oper = OPER_NONE ;
}
/*
* Lets get ready for the big event. First allocate enough space to
* hold the data we are hoping to be able to read. Then read it
* directly into the string.
*/
retvalue = Str_make(length+1) ;
errno = 0 ;
didread = fread( retvalue->value, 1, length, fileptr->fileptr ) ;
/*
* Variable 'read' contains the number of items (=bytes) read, or
* it contains EOF if an error occurred. Handle the error the
* normal way; i.e. trigger file_error and return nothing.
*/
if (didread==EOF)
{
file_error( fileptr, errno, NULL ) ;
return nullstringptr() ;
}
/*
* What if we didn't manage to read all the data? Well, return what
* we got, but still trigger an error, since EOF should be
* considered a NOTREADY condition. However, we try to handle EOF
* a bit more elegantly than other errors, since lots of programmers
* are probably not bothering about EOF; an EOF condition should be
* able to be reset using a file positioning.
*/
assert( 0<=didread && didread<=length ) ; /* It'd better be! */
retvalue->len = didread ;
if (didread<length)
{
file_warning( fileptr, 0, "EOF on char input" ) ;
fileptr->flag |= FLAG_RDEOF ;
}
else
fileptr->flag &= ~FLAG_RDEOF ;
/*
* Then, at the end, we have to set the pointers and counter to
* the correct values
*/
fileptr->thispos += didread ;
fileptr->readpos += didread ;
fileptr->readline = (-1) ;
fileptr->linesleft = 0 ;
fileptr->oper = OPER_READ ;
return retvalue ;
}
/*
* This routines write a string to a file pointed to by the Rexx file
* table entry 'fileptr'. The string to be written is 'string', and the
* length of the write is implicitly given avs the length of 'string'
*
* This routine is called from the Rexx built-in function CHAROUT().
* It is a fairly streight forward implementation.
*/
int writebytes( fileboxptr fileptr, streng *string )
{
int written=0 ;
/*
* First, if this file is in state ERROR, don't touch it, what to
* return depends on whether the file is in state FAKE.
*/
if ( fileptr->flag & FLAG_ERROR )
if ( fileptr->flag & FLAG_FAKE )
return string->len ;
else
{
file_error( fileptr, 0, NULL ) ;
if (fileptr->flag & FLAG_FAKE)
return string->len ;
return 0 ;
}
/*
* If we are not at the current write position, we have to
* seek to the correct position
*/
if (fileptr->thispos != fileptr->writepos)
{
errno = 0 ;
if (fseek(fileptr->fileptr, fileptr->writepos, SEEK_SET ))
{
file_error( fileptr, errno, NULL ) ;
return 0 ;
}
fileptr->thispos = fileptr->writepos ;
fileptr->oper = OPER_NONE ;
}
/*
* If previous operation on this file was a read, we have to flush
* the file before we can perform any write operations. This will
* seldom happen, since it is in general handled above.
*/
if (fileptr->oper & OPER_READ)
{
errno = 0 ;
if (fseek(fileptr->fileptr, 0, SEEK_CUR))
{
file_error( fileptr, errno, NULL ) ;
return (fileptr->flag & FLAG_FAKE) ? string->len : 0 ;
}
fileptr->oper = OPER_NONE ;
}
/*
* Here comes the actual writing. This also works when the length
* of string is zero.
*/
errno = 0 ;
written = fwrite( string->value, 1, string->len, fileptr->fileptr ) ;
/*
* Here comes the error checking. Note that this function will
* return the number of elements written, it will never return
* EOF as fread can, since the problems surrounding EOF can not
* occur in this operation. Therefore, report a fullfleged error
* whenever rc is less than the length of string.
*/
assert( 0<=written && written<=string->len ) ;
if (written < string->len )
file_error( fileptr, errno, NULL ) ;
else
{
/*
* If the operation was successful, then we set misc status
* information about the file, and the counters and pointers.
*/
fileptr->writeline = 0 ;
fileptr->flag &= ~FLAG_RDEOF ;
fileptr->oper = OPER_WRITE ;
fileptr->thispos += written ;
fileptr->writepos += written ;
fflush( fileptr->fileptr ) ;
}
return written ;
}
/*
* This routine counts the complete lines remaining in the file
* pointed to by the Rexx file table entry 'ptr'. The count starts
* at the current read position, and the current line will be counted
* even if the current read position points to the middle of a line.
* The last line will only be counted if it was actually terminated
* by a EOL marker. If the current line is the last line, but it was
* not explicitly terminated by a EOL marker, zero is returned.
*/
int countlines( fileboxptr ptr )
{
long oldpoint=0L ;
int left=0, ch=0, prevch=-1 ;
/*
* If this file is in ERROR state, we really don't want to try to
* operate on it. Just report an error, and return 0.
*/
if ( ptr->flag & FLAG_ERROR )
{
if (!(ptr->flag & FLAG_FAKE))
file_error( ptr, 0, NULL ) ;
return 0 ;
}
/*
* Counting lines requires us to reposition in the file. However,
* we can not reposition in transient files. If this is not a
* persistent file, don't do any repositioning, just return one
* for any situation where we are not sure whether there are more
* data or not (i.e. unless we are sure that there are no more data,
* return "1"
*/
if (!(ptr->flag & FLAG_PERSIST))
{
return (!feof(ptr->fileptr)) ;
}
else
{
/*
* Take advantage of the cached value of the lines left in the
* file
*/
if (ptr->linesleft)
return ptr->linesleft ;
/*
* If, however, this is a persistent file, we have to read from
* the current read position to the end-of-file, and count all
* the lines. First, make sure that wse position at the current
* read position.
*/
errno = 0 ;
oldpoint = ftell( ptr->fileptr ) ;
if (oldpoint==EOF)
{
file_error( ptr, errno, NULL ) ;
return 0 ;
}
/*
* Then read the rest of the file, and keep a count of all the files
* read in the process.
*/
#ifdef UNIX
for(left=0;((ch=getc(ptr->fileptr))!=EOF);)
if (ch==EOL)
left++ ;
#else
for(left=0;;)
{
ch = getc(ptr->fileptr);
if (ch == EOF)
break;
if ( ch == CR)
left++ ;
else
{
if ( ch == EOL && prevch != CR)
left++ ;
}
prevch = ch;
}
#endif
/*
* At the end, try to reposition back to the old current read
* position, and report an error if that attempt failed.
*/
errno = 0 ;
if (fseek(ptr->fileptr, oldpoint, SEEK_SET))
{
file_error( ptr, errno, NULL ) ;
return 0 ;
}
ptr->linesleft = left ;
}
return left ;
}
/*
* This routine calculates the number of bytes remaining in the file,
* i.e the number of bytes from the current read position until the
* end-of-file. It is, of course, called from the Rexx built-in
* function CHARS()
*/
int calc_chars_left( fileboxptr ptr )
{
int left=0 ;
long oldpoint=0L, newpoint=0L ;
if (! ptr->flag & FLAG_READ)
return 0 ;
/*
* First, determine whether this file is in ERROR state. If so, we
* don't want to touch it. Whether or not the file is in FAKE state
* is fairly irrelevant in this situation
*/
if ( ptr->flag & FLAG_ERROR )
{
if (!(ptr->flag & FLAG_FAKE))
file_error( ptr, 0, NULL ) ;
return 0 ;
}
/*
* If this is not a persistent file, then we have no means of finding
* out how much of the file is available. Then, return 1 if we are not
* at the end-of-file, and 0 otherwise.
*/
if (!(ptr->flag & FLAG_PERSIST))
left = ( !(ptr->flag & FLAG_RDEOF)) ;
else
{
/*
* This is a persistent file, which is not in error state. OK, then
* we must record the current point, fseek to the end-of-file,
* ftell to get that position, and fseek back to where we started.
* And we have to check for errors everywhere ... sigh.
*
* First, record the current position in the file.
*/
errno = 0 ;
oldpoint = ftell( ptr->fileptr ) ;
if (oldpoint==EOF)
{
file_error( ptr, errno, NULL ) ;
return 0 ;
}
/*
* Then, move the current position to the end-of-file
*/
errno = 0 ;
if (fseek(ptr->fileptr, 0L, SEEK_END))
{
file_error( ptr, errno, NULL ) ;
return 0 ;
}
/*
* And record the position of the end-of-file
*/
errno = 0 ;
newpoint = ftell( ptr->fileptr ) ;
if (newpoint==EOF)
{
file_error( ptr, errno, NULL ) ;
return 0 ;
}
/*
* And, at last, position back to the place where we started.
* Actually, this may not be necessary, since we _can_ leave the
* current position at the end-of-file. After all, the next read
* or write _will_ position back correctly. However, let's be
* nice ...
*/
errno = 0 ;
if (fseek(ptr->fileptr, oldpoint, SEEK_SET))
{
file_error( ptr, errno, NULL ) ;
return 0 ;
}
/*
* Then we have some accounting to do; calculate the size of the
* last part of the file. And also set oper to NONE, we _have_
* done a repositioning ... actually, several :-)
*/
left = newpoint - ptr->readpos ;
ptr->oper = OPER_NONE ;
}
return left ;
}
/*
* This routine writes a line to the file indicated by 'ptr'. The line
* to be written is 'data', and it will be terminated by an extra
* EOL marker after the charactrers in 'data'.
*/
int writeoneline( fileboxptr ptr, streng *data )
{
char *i=NULL ;
/*
* First, make sure that the file is not in ERROR state. If it is
* report an error, and return a result depending on whether this
* file is to be faked.
*/
if (ptr->flag & FLAG_ERROR)
if (ptr->flag & FLAG_FAKE)
return 0 ;
else
{
file_error( ptr, 0, NULL ) ;
if (ptr->flag & FLAG_FAKE)
return 0 ;
return 1 ;
}
/*
* If we are to write a new line, we ought to truncate the file after
* that line. Or rather, we truncate the file at the start of the
* new line, before we write it out. But only if we have the non-POSIX
* function ftruncate() available. And not if we are already there.
*/
#if defined(HAVE_FTRUNCATE)
# if OLD_OPTIONS
if (currlevel->u.options.lineouttrunc)
# else
if ( get_options_flag( currlevel, EXT_LINEOUTTRUNC ) )
# endif
{
if (ptr->oper != OPER_WRITE && !(ptr->flag & (FLAG_WREOF)) &&
(ptr->flag & FLAG_PERSIST))
{
int fno ;
errno = 0 ;
fno = fileno( ptr->fileptr ) ;
if (ftruncate( fno, ptr->writepos))
{
file_error( ptr, errno, NULL ) ;
return !(ptr->flag & FLAG_FAKE) ;
}
fseek( ptr->fileptr, 0, SEEK_END ) ;
ptr->thispos = ptr->writepos = ftell( ptr->fileptr ) ;
if (ptr->readpos>ptr->thispos && ptr->readpos!=EOF)
{
ptr->readpos = ptr->thispos ;
ptr->readline = 0 ;
ptr->linesleft = 0 ;
}
}
}
#endif
/*
* Then, output the characters in 'data', and sense any problem.
* If there is a problem, report an error
*/
errno = 0 ;
for (i=data->value; i<Str_end(data); i++)
{
if (putc( *i, ptr->fileptr)==EOF)
{
file_error( ptr, errno, NULL ) ;
return 1 ;
}
}
/*
* After all the data has been written out, we have to explicitly
* terminate the file with an end-of-line marker. Under Unix this
* is the single character EOL. Under Macintosh this is the single
* character CR, and all others it is CR and EOL.
*/
#if !defined(UNIX)
if (putc( CR, ptr->fileptr)==EOF)
{
file_error( ptr, errno, NULL ) ;
return 1 ;
}
#endif
#if !defined(MAC)
if (putc( EOL, ptr->fileptr)==EOF)
{
file_error( ptr, errno, NULL ) ;
return 1 ;
}
#endif
/*
* Then we have to update the counters and pointers in the Rexx
* file table entry. We must do that in order to be able to keep
* track of where we are.
*/
ptr->thispos += data->len + 1 ;
ptr->writepos = ptr->thispos ;
ptr->oper = OPER_WRITE ;
if (ptr->writeline)
ptr->writeline++ ;
ptr->flag |= FLAG_WREOF ;
/*
* At the end, we flush the data. We do this in order to avoid
* surprises later. Maybe we shouldn't do that, since it may force
* a systemcall, which might give away the timeslice and decrease
* system time. So you might want to remove this call ... at your
* own risk :-)
*/
errno = 0 ;
if (fflush( ptr->fileptr ))
{
file_error( ptr, errno, NULL ) ;
return 1 ;
}
return 0 ;
}
/*
* This routine is a way of retrieving the information returned by the
* standard Unix call stat(). It takes the name of a file as parameter,
* and return information about that file. This is not standard Rexx,
* but quite useful. It is accessed through the built-in function
* STREAM(), command 'FSTAT'
*/
streng *getstatus( streng *filename , int subcommand)
{
fileboxptr ptr=NULL ;
int rc=0 ;
int fno=0 ;
long pos_read = -2L, pos_write = -2L, pos_line = -2L;
int streamtype = 0; /* unknown */
streng *result=NULL ;
struct stat buffer ;
struct tm *static_tmdata = NULL ;
struct tm tmdata ;
static char *fmt = "%02d-%02d-%02d %02d:%02d:%02d" ;
static char *iso = "%04d-%02d-%02d %02d:%02d:%02d" ;
static char *streamdesc[] = { "UNKNOWN", "PERSISTENT", "TRANSIENT" };
/*
* First get the Rexx file table entry associated with the file,
* and then call stat() for that file. If the file is already open,
* then call fstat, since that will in general be a 'safer' way
* to be sure that it is _really_ the file that is open in Rexx.
*/
ptr = getfileptr( filename ) ;
if (ptr && ptr->fileptr)
{
fno = fileno( ptr->fileptr ) ;
rc = fstat( fno, &buffer ) ;
if (ptr->flag & FLAG_PERSIST)
streamtype = 1;
else
streamtype = 2;
pos_read = ptr->readpos;
pos_write = ptr->writepos;
pos_line = ptr->readline;
}
else
{
/*
* Nul terminate the filename string, as stat() will barf if
* it isn't.
*/
filename->value[filename->len] = 0x00;
rc = stat( filename->value, &buffer ) ;
streamtype = 1;
}
/*
* If we were able to retrieve any useful information, store it
* in a string of suitable length, and return that string.
* If the filename does not exist, always return an empty string.
*/
if (rc==(-1))
result = nullstringptr() ;
else
{
switch ( subcommand )
{
case COMMAND_FSTAT:
result = Str_make( 128 ) ;
sprintf( result->value,
"%d %ld %03o %d %s %s %ld",
buffer.st_dev, (long)(buffer.st_ino),
buffer.st_mode & 0x7f, buffer.st_nlink,
#if defined(VMS) || defined(OS2) || defined(DOS) || defined (__WATCOMC__) || defined(_MSC_VER) /* MH 10-06-96 */
"USER", "GROUP",
#else
getpwuid( buffer.st_uid )->pw_name,
getgrgid( buffer.st_gid )->gr_name,
#endif
(long)(buffer.st_size) ) ;
break;
case COMMAND_QUERY_EXISTS:
#if defined(HAVE__FULLPATH)
result = Str_make( _MAX_PATH );
_fullpath(result->value, filename->value, _MAX_PATH);
#elif defined(HAVE_TRUENAME)
result = Str_make( _MAX_PATH ) ;
_truename(filename->value, result->value);
#else
result = Str_make( 1024 ) ;
if (my_fullpath(result->value, filename->value, 1024) == -1)
result = nullstringptr() ;
#endif
break;
case COMMAND_QUERY_SIZE:
result = Str_make( 50 ) ;
sprintf( result->value, "%ld", (long)(buffer.st_size) ) ;
break;
case COMMAND_QUERY_HANDLE:
if (fno)
{
result = Str_make( 10 ) ;
sprintf( result->value, "%d", fno ) ;
}
else
result = nullstringptr() ;
break;
case COMMAND_QUERY_STREAMTYPE:
result = Str_make( 12 ) ;
sprintf( result->value, "%s", streamdesc[streamtype] ) ;
break;
case COMMAND_QUERY_DATETIME:
static_tmdata = localtime(&buffer.st_mtime) ;
memcpy(&tmdata, static_tmdata, sizeof(struct tm));
result = Str_make( 20 ) ;
sprintf( result->value, fmt, tmdata.tm_mon+1, tmdata.tm_mday,
tmdata.tm_year, tmdata.tm_hour, tmdata.tm_min,
tmdata.tm_sec ) ;
break;
case COMMAND_QUERY_TIMESTAMP:
static_tmdata = localtime(&buffer.st_mtime) ;
memcpy(&tmdata, static_tmdata, sizeof(struct tm));
result = Str_make( 20 ) ;
sprintf( result->value, iso, tmdata.tm_year+1900, tmdata.tm_mon+1,
tmdata.tm_mday,
tmdata.tm_hour, tmdata.tm_min,
tmdata.tm_sec ) ;
break;
case COMMAND_QUERY_POSITION_READ:
case COMMAND_QUERY_POSITION_CHAR:
case COMMAND_QUERY_POSITION_SYS:
if (pos_read != (-2))
{
result = Str_make( 50 ) ;
sprintf( result->value, "%ld", pos_read + 1) ;
}
else
result = nullstringptr() ;
break;
case COMMAND_QUERY_POSITION_WRITE:
if (pos_write != (-2))
{
result = Str_make( 50 ) ;
sprintf( result->value, "%ld", pos_write + 1) ;
}
else
result = nullstringptr() ;
break;
case COMMAND_QUERY_POSITION_LINE:
if (pos_line != (-2))
{
result = Str_make( 50 ) ;
sprintf( result->value, "%ld", pos_line ) ;
}
else
result = nullstringptr() ;
break;
}
result->len = strlen( result->value ) ;
}
return result ;
}
/*
* This little sweet routine returns information stored in the Rexx
* file table entry about the named file 'filename'. It is perhaps more
* of a debugging function than a Rexx function. It is accessed by the
* Rexx built-in function STREAM(), command 'STATUS'. One of the nice
* pieces of information this function returns is whether a file is
* transient or persistent.
*
* This is really a simple function, just retrieve the Rexx file
* table entry, and store the information in that entry into a string
* and return that string.
*
* The difference between getrexxstatus() and getstatus() is that
* that former returns information stored in Rexx's datastructures,
* while the latter return information about the file stored in and
* managed by the operating system
*/
streng *getrexxstatus( fileboxptr ptr )
{
streng *result=NULL ;
if (ptr==NULL)
return nullstringptr() ;
result = Str_make(64) ; /* Ought to be enough */
result->value[0] = 0x00 ;
if ((ptr->flag & FLAG_READ) && (ptr->flag & FLAG_WRITE))
strcat( result->value, "READ/WRITE" ) ;
else if (ptr->flag & FLAG_READ)
strcat( result->value, "READ" ) ;
else if (ptr->flag & FLAG_WRITE)
strcat( result->value, "WRITE" ) ;
else
strcat( result->value, "NONE" ) ;
sprintf( result->value + strlen(result->value),
" READ: char=%ld line=%d WRITE: char=%ld line=%d %s",
(long)(ptr->readpos+1), ptr->readline,
(long)(ptr->writepos+1), ptr->writeline,
(ptr->flag & FLAG_PERSIST) ? "PERSISTENT" : "TRANSIENT" ) ;
result->len = strlen(result->value) ;
return result ;
}
/*
* This routine parses the remainder of the parameters passed to the
* Stream(,'C','QUERY...') function.
*/
streng *getquery( streng *filename , streng *subcommand)
{
streng *result=NULL, *psub=NULL ;
char oper = 0;
/*
* Get the subcommand to QUERY
*/
oper = get_querycommand( subcommand );
switch ( oper )
{
case COMMAND_QUERY_DATETIME :
case COMMAND_QUERY_TIMESTAMP :
case COMMAND_QUERY_EXISTS :
case COMMAND_QUERY_HANDLE :
case COMMAND_QUERY_SIZE :
case COMMAND_QUERY_STREAMTYPE :
result = getstatus(filename, oper );
break;
case COMMAND_QUERY_SEEK :
case COMMAND_QUERY_POSITION :
if ( oper == COMMAND_QUERY_SEEK )
psub = Str_nodup( subcommand, 4, subcommand->len - 4 );
else
psub = Str_nodup( subcommand, 8, subcommand->len - 8 );
psub = Str_strp( psub, ' ', STRIP_LEADING);
oper = get_querypositioncommand( psub );
switch ( oper )
{
case COMMAND_QUERY_POSITION_READ :
case COMMAND_QUERY_POSITION_WRITE :
case COMMAND_QUERY_POSITION_CHAR :
case COMMAND_QUERY_POSITION_LINE :
case COMMAND_QUERY_POSITION_SYS :
result = getstatus(filename, oper );
break;
default:
exiterror( ERR_INCORRECT_CALL, 0 ) ;
break;
}
Free_string(psub);
break;
default:
exiterror( ERR_INCORRECT_CALL, 0 ) ;
break;
}
return result ;
}
/*
* This routine parses the remainder of the parameters passed to the
* Stream(,'C','OPEN...') function.
*/
streng *getopen( streng *filename , streng *subcommand)
{
fileboxptr ptr=NULL ;
streng *result=NULL, *psub=NULL ;
char oper = 0;
/*
* Get the subcommand to OPEN
*/
oper = get_opencommand( subcommand );
switch ( oper )
{
case COMMAND_OPEN_BOTH :
if ( subcommand->len >= 4
&& memcmp(subcommand->value, "BOTH", 4) == 0 )
psub = Str_nodup( subcommand, 4, subcommand->len - 4 );
else
psub = Str_dup( subcommand );
psub = Str_strp( psub, ' ', STRIP_LEADING);
oper = get_opencommandboth( psub );
switch ( oper )
{
case COMMAND_OPEN_BOTH :
closefile( filename ) ;
ptr = openfile( filename, ACCESS_WRITE ) ;
break;
case COMMAND_OPEN_BOTH_APPEND :
closefile( filename ) ;
ptr = openfile( filename, ACCESS_STREAM_APPEND ) ;
break;
case COMMAND_OPEN_BOTH_REPLACE :
closefile( filename ) ;
ptr = openfile( filename, ACCESS_STREAM_REPLACE ) ;
break;
default:
exiterror( ERR_INCORRECT_CALL, 0 ) ;
break;
}
Free_string(psub);
if (ptr->fileptr)
result = Str_cre( "READY:" ) ;
else
result = Str_cre( "ERROR:2" ) ;
break;
case COMMAND_OPEN_READ :
closefile( filename ) ;
ptr = openfile( filename, ACCESS_READ ) ;
if (ptr->fileptr)
result = Str_cre( "READY:" ) ;
else
result = Str_cre( "ERROR:2" ) ;
break;
case COMMAND_OPEN_WRITE :
psub = Str_nodup( subcommand, 5, subcommand->len - 5 );
psub = Str_strp( psub, ' ', STRIP_LEADING);
oper = get_opencommandwrite( psub );
switch ( oper )
{
case COMMAND_OPEN_WRITE :
closefile( filename ) ;
ptr = openfile( filename, ACCESS_WRITE ) ;
break;
case COMMAND_OPEN_WRITE_APPEND :
closefile( filename ) ;
ptr = openfile( filename, ACCESS_STREAM_APPEND ) ;
break;
case COMMAND_OPEN_WRITE_REPLACE :
closefile( filename ) ;
ptr = openfile( filename, ACCESS_STREAM_REPLACE ) ;
break;
default:
exiterror( ERR_INCORRECT_CALL, 0 ) ;
break;
}
Free_string(psub);
if (ptr->fileptr)
result = Str_cre( "READY:" ) ;
else
result = Str_cre( "ERROR:2" ) ;
break;
default:
exiterror( ERR_INCORRECT_CALL, 0 ) ;
break;
}
return result ;
}
/* ------------------------------------------------------------------- */
/* Rexx builtin functions (level 3) */
/*
* This part consists of one function for each of the Rexx builtin
* functions that operates on filesystem I/O
*/
/*
* This routine implements the Rexx built-in function CHARS(). It is
* really quite simple, little more than a wrap-around to the
* function calc_chars_left.
*/
streng *std_chars( paramboxptr parms )
{
char opt = 'N';
streng *string=NULL ;
fileboxptr ptr=NULL ;
int was_closed=0, result=0 ;
/* Syntax: chars([filename]) */
checkparam( parms, 0, 2 , "CHARS" ) ;
if (parms&&parms->next&&parms->next->value)
opt = getoptionchar( parms->next->value, "CHARS", 2, "CN" ) ;
string = (parms->value && parms->value->len) ? parms->value : stdio_ptr[0]->filename ;
/*
* Get a pointer to the Rexx file table entry of the file, and
* calculate the number of characters left.
*/
ptr = getfileptr( string ) ;
was_closed = (ptr==NULL) ;
if (!ptr)
ptr = get_file_ptr( string, OPER_READ, ACCESS_READ ) ;
result = calc_chars_left( ptr ) ;
if (was_closed)
closefile( string ) ;
return int_to_streng( result ) ;
}
/*
* Implements the Rexx builtin function charin(). This function takes
* three parameters, and they are treated pretty straight forward
* according to TRL. If called with no start position, and a length of
* zero, it may be used to do some fancy work (flushing I/O?), although
* that is probably more needed for output :-) Note that the file in
* entered into the file table in this case, so it might be used to
* explicitly open a file for reading. However, consider using stream()
* to do this, it's a much cleaner approach!
*/
streng *std_charin( paramboxptr parms )
{
streng *filename=NULL, *result=NULL ;
fileboxptr ptr=NULL ;
int length=0, start=0 ;
/* Syntax: charin([filename][,[start][,length]]) */
checkparam( parms, 0, 3 , "CHARIN" ) ;
/*
* First, let's get the information about the file from the
* file table, and open it in the correct mode if is not already
* availble as such.
*/
filename = (parms->value && parms->value->len) ? (parms->value) : stdio_ptr[0]->filename ;
ptr = get_file_ptr( filename, OPER_READ, ACCESS_READ ) ;
/*
* Then, get the starting point, or set it to zero.
*/
parms = parms->next ;
if ((parms)&&(parms->value))
start = atopos(parms->value) ;
else
start = 0 ;
/*
* At last, get the length, or use the default value one.
*/
if (parms)
parms = parms->next ;
if ((parms)&&(parms->value))
length = atozpos( parms->value ) ;
else
length = 1 ;
/*
* Position current position in file if necessary
*/
if (start)
positioncharfile( ptr, OPER_READ, start ) ;
if (length)
result = readbytes( ptr, length ) ;
else
{
if (!start)
flush_input( ptr ) ; /* Whatever happens ... */
result = nullstringptr() ;
}
return result ;
}
/*
* This function implements the Rexx built-in function CHAROUT(). It
* is basically a wrap-around for the two functions that perform
* character repositioning in a file; and writes out characters.
*/
streng *std_charout( paramboxptr parms )
{
streng *filename=NULL, *string=NULL ;
int length=0, pos=0 ;
fileboxptr ptr=NULL ;
/* Syntax: charout([filename][,[string][,start]]) */
checkparam( parms, 0, 3 , "CHAROUT" ) ;
filename = (parms->value && parms->value->len) ? (parms->value) : stdio_ptr[1]->filename ;
/* Read the data to be written, if any */
parms = parms->next ;
if (parms && parms->value )
string = parms->value ;
else
string = NULL ;
/* Read the position to start writing, is any */
if (parms)
parms = parms->next ;
if ( parms && parms->value )
pos = atopos(parms->value) ;
else
pos = 0 ;
/*
* Get the filepointer, if necessary, open in in the right mode
*/
if (pos || string)
ptr = get_file_ptr( filename, OPER_WRITE, ACCESS_WRITE ) ;
#ifdef lint
else
ptr = NULL ;
#endif
/*
* If we are to position the write position somewhere, do that first.
*/
if (pos)
positioncharfile( ptr, OPER_WRITE, pos ) ;
/*
* Then, write the actual data, or flush output if neither data nor
* position was given.
*/
if (string)
length = string->len - writebytes( ptr, string ) ;
else
{
length = 0 ;
if (!pos)
flush_output( filename ) ; /* Whatever that may mean */
}
return int_to_streng( length ) ;
}
/*
* Simple routine that implements the Rexx built-in function LINES().
* Really just a wrap-around to the countlines() routine.
*/
streng *std_lines( paramboxptr parms )
{
char opt = 'N';
fileboxptr ptr=NULL ;
streng *filename=NULL ;
int was_closed=0, result=0 ;
/* Syntax: lines([filename][,S|N]) */
checkparam( parms, 0, 2 , "LINES" ) ;
if (parms&&parms->next&&parms->next->value)
opt = getoptionchar( parms->next->value, "LINES", 2, "CN" ) ;
/*
* Get the name of the file (use defaults if necessary), and get
* a pointer to the entry of that file from the file table
*/
if (parms->value
&& parms->value->len)
filename = parms->value ;
else
filename = stdio_ptr[0]->filename ;
/*
* Try to get the Rexx file table entry, if it doesn't work, then
* try again ... and a bit harder
*/
ptr = getfileptr( filename ) ;
was_closed = (ptr==NULL) ;
if (!ptr)
ptr = get_file_ptr( filename, OPER_READ, ACCESS_READ ) ;
/*
* It's rather simple ... all the work has already been done in
* the function countlines()
*/
result = countlines( ptr ) ;
if (was_closed)
closefile( filename ) ;
return int_to_streng( result ) ;
}
/*
* The Rexx built-in function LINEIN() reads a line from a file.
* The actual reading is performed in 'readoneline', while this routine
* takes care of range checking of parameters, and decides which
* lower level routines to call.
*/
streng *std_linein( paramboxptr parms )
{
streng *filename=NULL, *res=NULL ;
fileboxptr ptr=NULL ;
int count=0, line=0 ;
/* Syntax: linein([filename][,[line][,count]]) */
checkparam( parms, 0, 3 , "LINEIN" ) ;
/*
* First get the name of the file, or use the appropriate default
*/
if (parms->value
&& parms->value->len)
filename = parms->value ;
else
filename = stdio_ptr[0]->filename ;
/*
* Then get the line number at which the read it to start, or set
* set it to zero if none was specified.
*/
if (parms)
parms = parms->next ;
if (parms && parms->value)
line = atopos( parms->value ) ;
else
line = 0 ; /* Illegal value */
/*
* And at last, read the count, which can be only 0 or 1, and which
* is the number of lines to read.
*/
if (parms)
parms = parms->next ;
if (parms && parms->value)
{
count = atozpos( parms->value ) ;
if (count!=0 && count!=1)
exiterror( ERR_INCORRECT_CALL, 0 ) ;
}
else
count = 1 ; /* The default */
/*
* Now, get the pointer to the entry in the file table that contains
* information about this file, or make it automatically create
* an entry if one didn't exist.
*/
ptr = get_file_ptr( filename, OPER_READ, ACCESS_READ ) ;
/*
* If line was specified, we must reposition the current read
* position of the file.
*/
if (line)
positionfile( ptr, OPER_READ, line ) ;
/*
* As the last thing, read in the data. If no data was wanted, skip it
* but call flushing if line wasn't specified either.
*/
if (count)
res = readoneline( ptr ) ;
else
{
if (!line)
flush_input( ptr ) ;
res = nullstringptr() ;
}
return res ;
}
/*
* This function is a wrap-around for the Rexx built-in function
* LINEOUT(). It performs parameter checking and decides which lower
* level routines to call.
*/
streng *std_lineout( paramboxptr parms )
{
streng *string=NULL, *file=NULL ;
int lineno=0, result=0 ;
fileboxptr ptr=NULL ;
/* Syntax: lineout([filename][,[string][,line]]) */
checkparam( parms, 0, 3 , "LINEOUT" ) ;
/*
* First get the pointer for the file to operate on. If omitted,
* use the standard output stream
*/
if (parms->value
&& parms->value->len)
file = parms->value ;
else
file = stdio_ptr[1]->filename ;
ptr = get_file_ptr( file, OPER_WRITE, ACCESS_WRITE ) ;
/*
* Then, get the data to be written, if any.
*/
if (parms)
parms = parms->next ;
if (parms && parms->value)
string = parms->value ;
else
string = NULL ;
/*
* At last, we must find the line number of the file to write. We
* must position the file at this line before the write.
*/
if (parms)
parms = parms->next ;
if (parms && parms->value)
lineno = atopos( parms->value ) ;
else
lineno = 0 ; /* illegal value */
if (string || lineno)
ptr = get_file_ptr( file, OPER_WRITE, ACCESS_WRITE ) ;
/*
* First, let's reposition the file if necessary.
*/
if (lineno)
positionfile( ptr, OPER_WRITE, lineno ) ;
/*
* And then, we write out the data. If there are not data, it may have
* been just positioning. However, if there are neither data nor
* a linenumber, something magic may happen.
*/
if (string)
result = writeoneline( ptr, string ) ;
else
{
if (!lineno)
flush_output( file ) ;
result = 0 ;
}
return int_to_streng( result ) ;
}
/*
* This function checks whether a particular file is accessable by
* the user in a certain mode, which may be read, write or execute.
* Unforunately, this function differs a bit from the functionality
* of several others. It explicitly checks a file, so that if the
* file didn't exist in advance, it is _not_ opened. And even _if_
* the file existed, the file in the file system is checked, not the
* file opened by Regina. The two may differ slightly under certain
* circumstances.
*/
int is_accessable( streng *filename, int mode )
{
int res=0 ;
filename = Str_ify( filename ) ;
/*
* First, call access() with the 'correct' parameters, and store
* the result in 'res'. If 'mode' had an "impossible" value, give
* an error.
*/
if (mode == COMMAND_READABLE)
res = access( filename->value, R_OK ) ;
else if (mode == COMMAND_WRITEABLE)
res = access( filename->value, W_OK ) ;
else if (mode == COMMAND_EXECUTABLE)
res = access( filename->value, X_OK ) ;
else
exiterror( ERR_INTERPRETER_FAILURE, 0 ) ;
/*
* Perhaps we should analyze the output a bit before returning?
* If res==EACCES, that is not really an error, while other errno
* code _do_ signify an error. However ... since the return code
* a boolean variable, just return it.
*/
return (res==0) ;
}
/*
* This little function implements the RESET command of the Rexx
* built-in function STREAM(). Basically, most of the job is done in
* the function 'fixup_file()'. Except from removing the ERROR flag.
* The 'fixup_file()' fucntion is intended for fixing the file at the
* start of a condition handler for the NOTREADY condition.
*
* The value returned from this function is either "READY" or "UNKNOWN",
* and reflects the philosophy that the file _is_ fixed, unless it
* is impossible to open it. Of course, that may be a false READY,
* since the actual _problem_ might not have been fixed, but at least
* you have another try at the problem.
*/
streng *reset_file( fileboxptr fileptr )
{
if (!fileptr)
return nullstringptr() ;
fixup_file( fileptr->filename ) ;
fileptr->flag &= ~(FLAG_ERROR | FLAG_FAKE) ;
if (fileptr->fileptr)
return Str_cre( "READY" ) ; /* Per definition */
else
return Str_cre( "UNKNOWN" ) ;
}
/*
* The built-in function STREAM() is new in TRL2. It is supposed to be
* a sort of all-round function for just about anything having to do with
* files. The details of its specification in TRL2 leaves a lot of room
* for the implementors. Two of the options to this command -- the Status
* and Description options are treated as defined by TRL, the Command
* option takes several command, defined by the COMMAND_ macros.
*/
streng* std_stream( paramboxptr parms )
{
char oper=' ' ;
streng *command=NULL, *result=NULL, *filename=NULL, *psub=NULL ;
fileboxptr ptr=NULL ;
/* Syntax: stream(filename[,[oper][,command ...]]) */
checkparam( parms, 1, 3 , "STREAM" ) ;
/*
* Get the filepointer to Rexx's file table, but make sure that the
* file is not in any way created if it didn't exist.
*/
filename = parms->value ;
ptr = getfileptr( filename ) ;
/*
* Read the 'operation'. This is really just an 'option'. The
* default option is 'S'.
*/
parms = parms->next ;
if (parms && parms->value)
oper = getoptionchar( parms->value, "STREAM", 2, "CSD" ) ;
else
oper = 'S' ;
/*
* If the operation was 'C', we _must_ have a third parameter, on the
* other hand, if it was not 'C', we must never have a third parameter.
* Make sure that these rules are followed.
*/
command = NULL ;
if (oper=='C')
{
parms = parms->next ;
if (parms && parms->value)
command = parms->value ;
else
exiterror( ERR_INCORRECT_CALL, 0 ) ;
}
else
if (parms && parms->next && parms->next->value)
exiterror( ERR_INCORRECT_CALL, 0 ) ;
/*
* Here comes the main loop.
*/
result = NULL ;
switch ( oper )
{
case 'C':
/*
* Read the command, and 'translate' it into an integer which
* describes it, see the implementation of get_command(), and
* the COMMAND_ macros. The first of these are rather simple,
* in fact, they could probably be compressed to save some
* space.
*/
command = Str_strp( command, ' ', STRIP_BOTH );
oper = get_command( command ) ;
switch(oper)
{
case COMMAND_NONE:
exiterror( ERR_INCORRECT_CALL, 0 ) ;
break;
case COMMAND_READ:
closefile( filename ) ;
ptr = openfile( filename, ACCESS_READ ) ;
break;
case COMMAND_WRITE:
closefile( filename ) ;
ptr = openfile( filename, ACCESS_WRITE ) ;
break;
case COMMAND_APPEND:
closefile( filename ) ;
ptr = openfile( filename, ACCESS_APPEND ) ;
break;
case COMMAND_UPDATE:
closefile( filename ) ;
ptr = openfile( filename, ACCESS_UPDATE ) ;
break;
case COMMAND_CREATE:
closefile( filename ) ;
ptr = openfile( filename, ACCESS_CREATE ) ;
break;
case COMMAND_CLOSE:
/*
* The file is always unknown after is has been closed. Does
* that sound convincing, or does it sound like I didn't feel
* to implement the rest of this ... ?
*/
closefile( filename ) ;
result = Str_cre( "UNKNOWN" ) ;
break ;
case COMMAND_FLUSH:
/*
* Flush the file. Actually, this might not be needed, since
* the functions that write out data may contain explicit
* calls to fflush()
*/
ptr = getfileptr( filename ) ;
if (ptr && ptr->fileptr)
{
errno = 0 ;
if (fflush( ptr->fileptr))
{
file_error( ptr, errno, NULL ) ;
result = Str_cre( "ERROR" ) ;
}
else
result = Str_cre( "READY" ) ;
}
else if (ptr)
result = Str_cre( "ERROR" ) ;
else
result = Str_cre( "UNKNOWN" ) ;
break ;
case COMMAND_STATUS:
ptr = getfileptr( filename ) ;
result = getrexxstatus( ptr ) ;
break;
case COMMAND_FSTAT:
result = getstatus( filename , COMMAND_FSTAT) ;
break;
case COMMAND_RESET:
ptr = getfileptr( filename ) ;
result = reset_file( ptr ) ;
break;
case COMMAND_READABLE:
case COMMAND_WRITEABLE:
case COMMAND_EXECUTABLE:
result = int_to_streng( is_accessable( filename, oper )) ;
break;
case COMMAND_QUERY:
/*
* We have to further parse the remainder of the command
* to determine what sub-command has been passed.
*/
psub = Str_nodup( command , 5, command->len - 5);
psub = Str_strp( psub, ' ', STRIP_LEADING);
result = getquery( filename, psub ) ;
Free_string(psub);
break;
case COMMAND_OPEN:
/*
* We have to further parse the remainder of the command
* to determine what sub-command has been passed.
*/
psub = Str_nodup( command , 4, command->len - 4);
psub = Str_strp( psub, ' ', STRIP_LEADING);
result = getopen( filename, psub ) ;
Free_string(psub);
break;
default:
exiterror( ERR_INCORRECT_CALL, 0 ) ;
break;
}
break ;
case 'D':
/*
* Get a description of the most recent error for this file
*/
if (ptr)
{
if (ptr->errmsg)
result = Str_dup(ptr->errmsg) ;
else if (ptr->error)
result = Str_cre( strerror(ptr->error) ) ;
}
break ;
case 'S':
/*
* Get a simple status for the file in question. If the file
* doesn't exist in Rexx's tables, UNKNOWN is returned. If the
* file is in error state, return ERROR, else return READY,
* unless current read position is at EOF, in which case
* NOTREADY is return. Note that ERROR and NOTREADY are the
* two states that will raise the NOTREADY condition.
*/
if (ptr)
{
if (ptr->flag & FLAG_ERROR)
result = Str_cre( "ERROR" ) ;
else if (ptr->flag & FLAG_RDEOF)
result = Str_cre( "NOTREADY" ) ;
else
result = Str_cre( "READY" ) ;
}
else
result = Str_cre( "UNKNOWN" ) ;
break ;
default:
exiterror( ERR_INTERPRETER_FAILURE, 0 ) ;
}
if (result==NULL)
result = nullstringptr() ;
return result ;
}
/*
* This routine will traverse the list of open files, and dump relevant
* information about each of them. Really a debugging routine. It is
* not available when Regina is compiled with optimalization.
*/
#ifndef NDEBUG
streng *dbg_dumpfiles( paramboxptr parms )
{
fileboxptr ptr=NULL ;
int i=0 ;
char string[10] ;
checkparam( parms, 0, 0 , "DUMPFILES" ) ;
fprintf(stddump,
" Read Write\n" ) ;
fprintf(stddump,
"File Filename Flags line char line char\n");
for (ptr=mrufile;ptr;ptr=ptr->next)
{
int fno ;
fno = fileno( ptr->fileptr ) ;
fprintf( stddump,"%4d %-30s", fno, ptr->filename->value);
i = 0 ;
string[0] = ( ptr->flag & FLAG_READ ) ? 'r' : ' ' ;
string[1] = ( ptr->flag & FLAG_WRITE ) ? 'w' : ' ' ;
string[2] = ( ptr->flag & FLAG_PERSIST ) ? 'p' : 't' ;
string[3] = ( ptr->flag & FLAG_RDEOF ) ? 'R' : ' ' ;
string[4] = ( ptr->flag & FLAG_WREOF ) ? 'W' : ' ' ;
string[5] = ( ptr->flag & FLAG_SURVIVOR ) ? 'S' : ' ' ;
string[6] = ( ptr->flag & FLAG_ERROR ) ? 'E' : ' ' ;
string[7] = ((ptr->flag & FLAG_FAKE) &&
(ptr->flag & FLAG_ERROR) ) ? 'F' : ' ' ;
string[8] = 0x00 ;
fprintf( stddump, " %8s %4ld %4d %4ld %4d\n",
string, (long)(ptr->readpos), ptr->readline,
(long)(ptr->writepos), ptr->writeline ) ;
if (ptr->flag & FLAG_ERROR)
{
if (ptr->errmsg)
fprintf(stddump, " ==> %s\n", ptr->errmsg->value ) ;
else if (ptr->error)
fprintf(stddump, " ==> %s\n", strerror( ptr->error )) ;
}
}
fprintf( stddump," r=read, w=write, p=persistent, t=transient, e=eof\n");
fprintf( stddump," R=read-eof, W=write-eof, S=special, E=error, F=fake\n");
return nullstringptr() ;
}
#endif
/*
* Yuk ... !
* This should really go out .... We definitively don't want to do this.
* we want to go through readoneline() for the default input stream.
*/
streng *readkbdline( void )
{
static int got_eof=0 ;
streng *source=NULL ;
int ch=0x00 ;
int i=0 ;
source = Str_make(BUFFERSIZE) ;
if (got_eof)
(void)fseek(stdin,SEEK_SET,0) ;
do
{
if (i<BUFFERSIZE)
source->value[i++] = ch = getc(stdin) ;
} while((ch!='\012')&&(ch!=EOF)) ;
got_eof = (ch==EOF) ;
source->len = i-1 ;
return source ;
}
/*
* This routine is not really interesting. You should use the STREAM()
* built-in function for greater portability and functionality. It is
* left in the code for portability reasons.
*/
#ifdef OLD_REGINA_FEATURES
streng *unx_open( paramboxptr parms )
{
fileboxptr ptr=NULL ;
char ch=' ' ;
int iaccess=ACCESS_NONE ;
checkparam( parms, 1, 2 , "OPEN" ) ;
if ((parms->next)&&(parms->next->value))
{
ch = getoptionchar( parms->next->value, "OPEN", 2, "RW" ) ;
if ( ch == 'R' ) /* bja */
iaccess = ACCESS_READ ;
else if ( ch == 'W' ) /* bja */
iaccess = ACCESS_WRITE ;
else
assert( 0 ) ;
}
else
iaccess = ACCESS_READ ;
parms->value = Str_ify( parms->value ) ;
ptr = openfile( parms->value, iaccess ) ;
return int_to_streng(( ptr && ptr->fileptr )) ;
}
#endif
/*
* This routine is not really interesting. You should use the CLOSE
* command of the STREAM() built-in function for greater portability
* and compatibility. It is left in the code only for compatibility
* reasons.
*/
#ifdef OLD_REGINA_FEATURES
streng *unx_close( paramboxptr parms )
{
fileboxptr ptr=NULL ;
checkparam( parms, 1, 1 , "CLOSE" ) ;
ptr = getfileptr( parms->value ) ;
closefile( parms->value ) ;
return int_to_streng( ptr!=NULL ) ;
}
#endif
/*
* The code in this function borrows heavily from code supplied by
* Keith Patton (keith,patton@dssi-jcl.com)
*/
void get_external_routine(char *inname, FILE **fp, char *outname)
{
static char *extensions[] = {"",".rexx",".rex",".cmd",NULL};
char *env_path = getenv("REGINA_MACROS");
char *paths = NULL;
int i = 0;
for (i=0;extensions[i]!=NULL && *fp == NULL;i++)
{
/*
* Try the filename without any path first
*/
strcpy(outname,inname);
strcat(outname,extensions[i]);
*fp = fopen(outname, "rb");
if (*fp != NULL)
break;
paths = env_path;
while (paths && !*fp)
{
int pathlen;
char *sep;
while (*paths == PATH_SEPARATOR)
paths++;
sep = strchr(paths, PATH_SEPARATOR);
pathlen = sep ? sep-paths : strlen(paths);
if (pathlen == 0)
break; /* no more paths! */
strncpy(outname, paths, pathlen);
outname[pathlen] = 0;
if (outname[pathlen-1] != FILE_SEPARATOR)
strcat(outname, FILE_SEPARATOR_STR);
strcat(outname, inname);
strcat(outname, extensions[i]);
paths = sep? sep+1 : 0; /* set up for next pass */
*fp = fopen(outname, "rb");
if (*fp != NULL)
break;
}
}
return;
}
void CloseOpenFiles( void )
{
extern sysinfobox *systeminfo ;
sysinfobox *ptr = systeminfo;;
while (ptr)
{
if (systeminfo->input_fp)
{
fclose(systeminfo->input_fp);
systeminfo->input_fp = NULL;
}
ptr = systeminfo->previous;
}
return;
}
#if !defined(HAVE__FULLPATH) && !defined(HAVE_TRUENAME)
/*
* This function builds up the full pathname of a file
* It is based heavily on code from splitpath() defined in
* nonansi.c of Mark Hessling's THE
*/
int my_fullpath( char *dst, char *src, int size )
{
char tmp[1024];
char curr_path[1024];
char path[1024];
char fname[1024];
int i = 0, len = -1;
struct stat stat_buf;
#ifdef __EMX__
_getcwd2(curr_path,1024);
#else
getcwd(curr_path,1024);
#endif
strcpy(tmp,src);
/*
* First determine if the supplied filename is a directory.
*/
#ifdef __EMX__
for ( i = 0; i < strlen( tmp ); i++ )
if ( tmp[ i ] == '\\' )
tmp[ i ] = '/';
#endif
if ((stat(tmp,&stat_buf) == 0)
&& (stat_buf.st_mode & S_IFMT) == S_IFDIR)
{
strcpy(path,tmp);
strcpy(fname,"");
}
else /* here if the file doesn't exist or is not a directory */
{
for (i=strlen(tmp),len=-1;i>-1;i--)
{
if (tmp[i] == '/')
{
len = i;
break;
}
}
switch(len)
{
case (-1):
#ifdef __EMX__
_getcwd2(path,1024);
#else
getcwd(path,1024);
#endif
strcpy(fname,tmp);
break;
case 0:
strcpy(path,tmp);
path[1] = '\0';
strcpy(fname,tmp+1+len);
break;
default:
strcpy(path,tmp);
path[len] = '\0';
strcpy(fname,tmp+1+len);
break;
}
}
/*
* Change directory to the supplied path, if possible and store the
* expanded path.
* If an error, restore the current path.
*/
#ifdef __EMX__
if (_chdir2(path) != 0)
{
_chdir2(curr_path);
return(-1);
}
_getcwd2(path,1024);
_chdir2(curr_path);
#else
if (chdir(path) != 0)
{
chdir(curr_path);
return(-1);
}
getcwd(path,1024);
chdir(curr_path);
#endif
/*
* Append the OS directory character to the path if it doesn't already
* end in the character.
*/
len = strlen(path);
if (len > 0)
{
if ( path[ len - 1 ] != '/' )
{
strcat(path,"/");
len++;
}
#ifdef __EMX__
for ( i = 0; i < len; i++ )
if ( path[ i ] == '/' )
path[ i ] = '\\';
#endif
}
strcpy(dst,path);
strcat(dst,fname);
return(0);
}
#endif
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