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/*
* uncommon.c -- functions used by ick, convickt, yuk and compiled programs
*
LICENSE TERMS
Copyright (C) 2007 Alex Smith
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 of the License, 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.
*/
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <ick_lose.h>
#include "uncommon.h"
/* Options that might affect this */
bool ick_printfopens=0;
/*@dependent@*/ /*@null@*/ FILE* ick_debfopen(/*@observer@*/ const char* fname,
/*@observer@*/ const char* mode)
{
FILE* t;
if(ick_printfopens) fprintf(stderr,"Trying to open '%s'...\n",fname);
t=fopen(fname,mode);
if(ick_printfopens && t != NULL) fprintf(stderr,"Success!\n");
if(ick_printfopens && t == NULL) fprintf(stderr,"Failed!\n");
return t;
}
/* This function looks for the skeleton and syslib, searching first the
path they should be in, then the current directory, then argv[0]'s
directory (if one was given). This function avoids possible buffer
overflows, instead truncating filenames (and if that manages to find them,
I'll be incredibly surprised). It also tries argv[0]/../lib and
argv[0]/../include (where they are when running without installing). */
/*@dependent@*/ /*@null@*/ FILE* ick_findandfopen(/*@observer@*/ const char* file,
/*@observer@*/ const char* guessdir,
/*@observer@*/ const char* mode,
/*@observer@*/ const char* argv0)
{
static char buf2[BUFSIZ];
/*@observer@*/ static const char *fileiter;
size_t i = 0, j;
FILE* ret;
while(guessdir && *guessdir != '\0' && i<BUFSIZ-2) buf2[i++] = *guessdir++;
buf2[i++] = '/';
fileiter = file;
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
buf2[i] = '\0';
ret = ick_debfopen(buf2,mode); /* where it ought to be */
if(ret) return ret;
ret = ick_debfopen(file,mode); /* current dir */
if(ret) return ret;
if(!strchr(argv0,'/')&&
!strchr(argv0,'\\')) return NULL; /* argv[0] has no dir specified */
i = j = 0;
while(*argv0 != '\0' && i<BUFSIZ-2)
{
buf2[i++] = *argv0++;
if(*argv0=='/') j = i;
if(*argv0=='\\') j = i;
}
i = j + 1;
fileiter=file;
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
buf2[i] = '\0';
ret = ick_debfopen(buf2,mode); /* argv[0]'s dir */
if(ret) return ret;
i = j + 1;
fileiter="../lib/"; /* correct for POSIX and DJGPP */
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
fileiter=file;
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
buf2[i]='\0';
ret = ick_debfopen(buf2,mode); /* argv[0]/../lib/ */
if(ret) return ret;
i = j + 1;
fileiter="../include/"; /* correct for POSIX and DJGPP */
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
fileiter=file;
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
buf2[i]='\0';
ret = ick_debfopen(buf2,mode); /* argv[0]/../include/ */
if(ret) return ret;
return NULL; /* just return 0 if even this failed */
}
/* AIS: The same, looking for an executable */
/*@observer@*/ /*@null@*/ const char* ick_findandtestopen(/*@observer@*/ const char* file,
/*@observer@*/ const char* guessdir,
/*@observer@*/ const char* mode,
/*@observer@*/ const char* argv0)
{
static char buf2[BUFSIZ];
/*@observer@*/ static const char *fileiter;
size_t i = 0, j;
FILE* ret;
while(guessdir && *guessdir != '\0' && i<BUFSIZ-2) buf2[i++] = *guessdir++;
buf2[i++] = '/';
fileiter = file;
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
buf2[i] = '\0';
ret = ick_debfopen(buf2,mode); /* where it ought to be */
if(ret) {(void) fclose(ret); return buf2;}
ret = ick_debfopen(file,mode); /* current dir */
if(ret) {(void) fclose(ret); return file;}
if(!strchr(argv0,'/')&&
!strchr(argv0,'\\')) return 0; /* argv[0] has no dir specified */
i = j = 0;
while(*argv0 != '\0' && i<BUFSIZ-2)
{
buf2[i++] = *argv0++;
if(*argv0=='/') j = i;
if(*argv0=='\\') j = i;
}
i = j + 1;
fileiter=file;
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
buf2[i] = '\0';
ret = ick_debfopen(buf2,mode); /* argv[0]'s dir */
if(ret) {(void) fclose(ret); return buf2;}
i = j + 1;
fileiter="../lib/"; /* correct for POSIX and DJGPP */
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
fileiter=file;
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
buf2[i]='\0';
ret = ick_debfopen(buf2,mode); /* argv[0]/../lib/ */
if(ret) {(void) fclose(ret); return buf2;}
i = j + 1;
fileiter="../include/"; /* correct for POSIX and DJGPP */
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
fileiter=file;
while(*fileiter != '\0' && i<BUFSIZ-1) buf2[i++] = *fileiter++;
buf2[i]='\0';
ret = ick_debfopen(buf2,mode); /* argv[0]/../include/ */
if(ret) {(void) fclose(ret); return buf2;}
return 0; /* just return 0 if even this failed */
}
/* AIS: The same thing, but with freopen */
/*@dependent@*/ /*@null@*/ FILE* ick_findandfreopen(/*@observer@*/ const char* file,
/*@observer@*/ const char* guessdir,
/*@observer@*/ const char* mode,
/*@observer@*/ const char* argv0,
FILE* over)
{
const char* s=ick_findandtestopen(file,guessdir,mode,argv0);
if(s != NULL)
return freopen(s,mode,over);
else
return NULL;
}
/**
* Invoke snprintf(), if supported. Otherwise invoke sprintf() and abort
* if we did overflow.
*/
int ick_snprintf_or_die(/*@out@*/ char *str, size_t size, /*@observer@*/ const char *format, ...)
{
va_list ap;
int retval;
va_start(ap, format);
#ifdef HAVE_VSNPRINTF
retval = vsnprintf(str, size, format, ap);
#else
retval = vsprintf(str, format, ap);
if (retval >= size)
ick_lose(IE553, 0, (const char*)NULL);
#endif
va_end(ap);
return retval;
}
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