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/* $id$
$Locker: $ $Name: $ $State: Exp $
* Grab the filename of COMMAND.COM
*
* If warn != 0, warnings can be issued; otherwise this functions
* is silent.
This file bases on INIT.C of FreeCOM v0.81 beta 1.
0 -> is valid
1 -> no such file
2 -> is a device
3 -> not valid
4 -> out of memory / syntax error ... .
$Log: grabfcom.c,v $
Revision 1.3 2003/12/09 20:25:34 skaus
bugfix: INIT: FreeCOM-path and TTY can be in any order
Revision 1.2 2002/11/05 19:29:21 skaus
bugfix: FreeCOM should accept relative path as argv[0]
Revision 1.1 2001/04/12 00:33:53 skaus
chg: new structure
chg: If DEBUG enabled, no available commands are displayed on startup
fix: PTCHSIZE also patches min extra size to force to have this amount
of memory available on start
bugfix: CALL doesn't reset options
add: PTCHSIZE to patch heap size
add: VSPAWN, /SWAP switch, .SWP resource handling
bugfix: COMMAND.COM A:\
bugfix: CALL: if swapOnExec == ERROR, no change of swapOnExec allowed
add: command MEMORY
bugfix: runExtension(): destroys command[-2]
add: clean.bat
add: localized CRITER strings
chg: use LNG files for hard-coded strings (hangForEver(), init.c)
via STRINGS.LIB
add: DEL.C, COPY.C, CBREAK.C: STRINGS-based prompts
add: fixstrs.c: prompts & symbolic keys
add: fixstrs.c: backslash escape sequences
add: version IDs to DEFAULT.LNG and validation to FIXSTRS.C
chg: splitted code apart into LIB\*.c and CMD\*.c
bugfix: IF is now using error system & STRINGS to report errors
add: CALL: /N
*/
#include "../config.h"
#include <assert.h>
#include <dos.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <dfn.h>
#include "../include/command.h"
#include "../err_fcts.h"
#include "../include/misc.h"
int grabComFilename(const int warn, const char far * const fnam)
{
char *buf;
size_t len;
int rc;
assert(fnam);
/* Copy the filename into the local heap */
len = _fstrlen(fnam);
if(len >= INT_MAX || len < 1) {
/* no filename specified */
if(warn)
error_syntax(0);
return 4;
}
if((buf = malloc(len + 1)) == 0) {
if(warn) error_out_of_memory();
return 4;
}
_fmemcpy((char far*)buf, fnam, len);
buf[len] = '\0';
if (buf[1] != ':' || buf[2] != '\\')
{ char *p;
/* expand the string for the user */
p = dfnexpand(buf, 0);
free(buf);
if((buf = p) == 0) {
if(warn) error_out_of_memory();
return 4;
}
if(warn)
error_init_fully_qualified(buf);
len = strlen(buf);
}
while(buf[len - 1] == '\\')
--len;
buf[len] = 0;
if(dfnstat(buf) & DFN_DIRECTORY) {
/* The user specified a directory, try if we can find the
COMMAND.COM with the standard name in there */
char *p;
if((p = realloc(buf, len + sizeof(COM_NAME) + 1)) == 0) {
if(warn) error_out_of_memory();
free(buf);
return 4;
}
buf = p;
strcpy(&buf[len], "\\" COM_NAME);
}
if(0 != (rc = validResFile(buf))) {
if(warn) switch(rc) {
default:
#ifdef NDEBUG
assert(0);
#endif
case 1: error_open_file(buf); break;
case 2: error_fcom_is_device(buf); break;
case 3: error_fcom_invalid(buf); break;
}
free(buf);
return rc;
}
free(ComPath); /* Save the found file */
ComPath = buf;
dprintf(("[INIT: new resource file name: %s]\n", ComPath));
isSwapFile = 0;
buf = dfnfilename(ComPath);
assert(buf);
if((buf = strchr(buf, '.')) != 0
&& stricmp(buf, ".swp") == 0) {
dprintf(("[INIT: VSpawn file found: %s]\n", ComPath));
memcpy(++buf, "COM", 3);
isSwapFile = buf - ComPath;
}
return 0;
}
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