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/*** pxfile.c *****************************************************************
**
** This file is part of BibTool.
** It is distributed under the GNU General Public License.
** See the file COPYING for details.
**
** (c) 1996-2020 Gerd Neugebauer
**
** Net: gene@gerd-neugebauer.de
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2, or (at your option)
** any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
** Description:
** This file provides routines for extended file opening. Files
** are sought in a list of directories and optionally with a set
** of extensions appended to them.
**
** Patterns may be given which are used to determine the full file
** name.
** The patterns are stored in a special data structure. A
** function is provided to allocate a pattern structure and fill
** it from a string specification.
**
******************************************************************************/
#include "config.h"
#include <bibtool/general.h>
#include <bibtool/pxfile.h>
#include <bibtool/sbuffer.h>
#include <ctype.h>
#ifndef __STDC__
#ifndef HAVE_GETENV
extern char * getenv _ARG((char* name)); /* */
#endif
#endif
#ifndef DEFAULT_PATTERN
#ifdef MSDOS
#define DEFAULT_PATTERN "%s\\%s"
#else
#define DEFAULT_PATTERN "%s/%s"
#endif
#endif
/*****************************************************************************/
/* Internal Programs */
/*===========================================================================*/
#ifdef __STDC__
#define _ARG(A) A
#else
#define _ARG(A) ()
#endif
FILE * px_fopen _ARG((char * name,char * mode,char **pattern,char **path,int (*show)_ARG((char*))));
char ** px_s2p _ARG((char * s,int sep));
static bool absolute_file _ARG((char *name,char **basename,char ***path));
static void expand_env _ARG((char * s,char * se,StringBuffer * res));
/*****************************************************************************/
/* External Programs */
/*===========================================================================*/
/*****************************************************************************/
/*-----------------------------------------------------------------------------
** Variable: px_filename
** Purpose: This variable contains the file name actually used by
** the last |px_fopen()| call. The memory is automatically
** managed and will be reused by the next call to
** |px_fopen()|. Thus if you need to use it make a
** private copy immediately after the call to the
** function |px_fopen()|.
**___________________________________________________ */
char *px_filename = "" ;
static size_t px_len = 0 ;
static char * no_path[] = { "." , NULL };
static char * no_pattern[] = { DEFAULT_PATTERN, NULL };
/*-----------------------------------------------------------------------------
** Function*: absolute_file()
** Purpose: Check is the file is an absolute file name.
** In this case make a new path array which contains the absolute
** path only and its location in path. basename is the modified
** file name.
**
** Currently UN*X and MSDOS like file names are supported.
** Arguments:
** name the name of the file
** basename
** path
** Returns: The return value is |true|
** Otherwise |false| is returned and nothing changed.
**___________________________________________________ */
static bool absolute_file(name,basename,path) /* */
char *name; /* */
char **basename; /* */
char ***path; /* */
{ static char *absolut_path[2]; /* */
static int first = (-1); /* */
size_t l; /* */
char *sp; /* */
#undef SEPARATOR
/* */
#ifdef MSDOS
#define SEPARATOR '\\'
if ( *name != SEPARATOR /* starting with root or */
&& ( *name == '\0' /* */
|| *(name+1) != ':' /* */
|| *(name+2) != SEPARATOR ) ) /* with drive */
#endif
#ifdef AMIGA
#define SEPARATOR '/'
if ( strchr(name,':') == NULL ) /* starting with root */
#endif
#ifndef SEPARATOR
#define SEPARATOR '/'
if ( *name != SEPARATOR ) /* starting with root */
#endif
{ return false; } /* */
/* */
sp = strrchr(name,SEPARATOR); /* find last separator */
/* existence guarenteed! */
#ifdef AMIGA
if ( sp == NULL ) sp = strchr(name,':'); /* */
#endif
l = (size_t)(sp-name); /* length of directory. */
if (first) /* */
{ first = 0; /* */
absolut_path[1] = NULL; /* mark end of array. */
absolut_path[0] = malloc(l+1); /* allocate */
} /* or */
else /* reallocate */
{ absolut_path[0] = realloc(*absolut_path,l+1); /* space for the */
} /* directory name */
/* */
(void)strncpy(absolut_path[0],name,l); /* save directory name */
*(absolut_path[0]+l) = '\0'; /* and mark the end. */
/* */
*basename = name+l+1; /* return the base name */
*path = absolut_path; /* return the path array */
/* */
return true; /* finished. */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: px_fopen()
** Purpose: Open a file using path and pattern.
**
**
** Arguments:
** name (base) name of the file to open.
** mode Mode for opening the file like used with |fopen()|.
** pattern A |NULL| terminated array of patterns.
** path The |NULL| terminated array of directories.
** show A function pointer or |NULL|.
** Returns: A file pointer refering to the file or |NULL|.
**___________________________________________________ */
FILE * px_fopen(name,mode,pattern,path,show) /* */
char * name; /* */
char * mode; /* */
char **pattern; /* */
char **path; /* */
int (*show)_ARG((char*)); /* */
{ char **fmt; /* */
char **pp; /* */
FILE * file; /* */
size_t len,plen; /* */
char **new_path; /* */
char *new_name; /* */
/* */
if ( path == NULL ) path = no_path; /* use default path */
if ( pattern == NULL ) pattern = no_pattern; /* use default pattern */
/* */
if ( absolute_file(name,&new_name,&new_path) ) /* */
{ name = new_name; /* */
path = new_path; /* */
} /* */
/* */
for ( plen=0,fmt=pattern;*fmt;++fmt ) /* compute longest */
{ len = strlen(*fmt); /* pattern */
if ( len > plen ) plen = len; /* */
} /* */
plen += 1+strlen(name); /* add length of name */
/* and 1 for '\0' */
if ( px_len == 0 && /* initial filename */
(px_filename = malloc(plen))==NULL ) /* then allocate or */
return(NULL); /* terminate */
px_len = plen-1; /* usable is 1 less */
/* */
for ( pp=path;*pp;++pp ) /* use all paths */
{ len = strlen(*pp) + plen; /* required space */
if ( px_len < len ) /* if less present get it */
{ char * old = px_filename; /* */
if ( (px_filename = realloc(px_filename,len))==NULL ) {/* */
free(old); /* */
return(NULL); /* */
} /* */
px_len = len-1; /* usable is 1 less */
} /* */
/* */
for ( fmt=pattern;*fmt;++fmt ) /* use all patterns */
{ (void)sprintf(px_filename,*fmt,*pp,name); /* construct new filename */
if ( ( show == NULL || /* if function present */
(*show)(px_filename) ) && /* and it says yes */
(file=fopen(px_filename,mode)) != NULL )/* and open succeeds */
return(file); /* then return file ptr */
} /* */
} /* */
*px_filename = '\0'; /* clear filename */
return(NULL); /* failure */
} /*------------------------*/
#define INIT_SIZE 32
#define INC_SIZE 16
/*-----------------------------------------------------------------------------
** Function: px_s2p()
** Purpose: Translate a path string specification into an array of the
** components.
** The memory of the array is malloced and should be freed when
** not used any longer.
** Arguments:
** s String to analyze
** sep Separator
** Returns: The array of the components
**___________________________________________________ */
char ** px_s2p(s,sep) /* */
char * s; /* */
int sep; /* */
{ register char *cp; /* */
register size_t l = 1; /* */
char **pattern; /* */
int *array; /* */
size_t array_size = INIT_SIZE; /* */
size_t array_ptr = 0; /* */
char *t; /* */
StringBuffer *sb; /* */
/* */
if (s == NULL) return NULL; /* No string to analyze */
/* */
if ( (array=(int*)malloc(array_size*sizeof(int)))/* */
== NULL ) /* */
{ return NULL; } /* */
/* */
t = cp = s; /* */
sb = sbopen(); /* */
for(;;) /* Count the number of */
{ /* fields and expand */
if ( *cp == sep || *cp == '\0' ) /* */
{ if ( array_ptr >= array_size ) /* */
{ array_size += INC_SIZE; /* */
int* old = array; /* */
array = (int*)realloc(array, /* */
array_size*sizeof(int));/* */
if ( array == NULL ) { /* */
free(old); /* */
return NULL; /* */
} /* */
} /* */
array[array_ptr++] = sbtell(sb); /* */
expand_env(t,cp,sb); /* */
sbputchar('\0',sb); /* */
t = cp+1; /* */
if ( *cp ) cp++; /* */
else break; /* */
} /* */
else /* */
{ cp++; /* */
} /* */
} /* */
/* */
l = sbtell(sb); /* */
s = sbflush(sb); /* */
/* */
if ( (pattern=(char**)malloc( (array_ptr+1)*sizeof(char*)/* */
+l*sizeof(char))) /* */
== (char**)NULL ) /* Try to allocate space */
{ return NULL; } /* */
/* */
cp = (char*)&pattern[array_ptr+1]; /* */
(void)memcpy(cp,s,l); /* save the string spec */
/* */
for ( l = 0; l < array_ptr; l++ ) /* */
{ pattern[l] = cp + array[l]; } /* */
pattern[array_ptr] = 0L; /* Mark end */
/* */
(void)free(array); /* */
(void)sbclose(sb); /* */
return pattern; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: expand_env()
** Type: static char *
** Purpose:
**
** Arguments:
** s
** se
** Returns:
**___________________________________________________ */
static void expand_env(s,se,res) /* */
char * s; /* */
char * se; /* */
StringBuffer * res; /* */
{ /* */
StringBuffer * val = sbopen(); /* */
/* */
for (; s < se; s++) /* */
{ /* */
if (*s == '$') /* */
{ char beg = '\0'; /* */
char * env; /* */
sbrewind(val); /* */
s++; /* */
if ( *s == '{' || *s == '(' ) /* */
{ beg = *(s++); } /* */
while ( isalpha(*s) || isdigit(*s) || *s == '_' )/* */
{ sbputchar(*s,val); /* */
s++; /* */
} /* */
if ( ( beg == '{' && *s == '}' ) || /* */
( beg == '(' && *s == ')' ) /* */
) /* */
{ s++; } /* */
env = sbflush(val); /* */
if (*env) /* */
{ env = getenv(env); /* */
if ( env != NULL ) /* */
{ sbputs(env,res); } /* */
} /* */
} /* */
#ifdef HOME_ENV_VAR
else if (*s == '~') /* */
{ /* */
char * env = getenv(HOME_ENV_VAR); /* */
if (env != NULL) /* */
{ sbputs(env,res); } /* */
} /* */
#endif
else /* */
{ sbputchar(*s,res); /* */
} /* */
} /* */
} /*------------------------*/
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