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view interps/c-intercal/src/uncommon.c @ 11293:a7899ef2d7b6
<wob_jonas> learn Aristotle said that every illness can be cured by balancing the four vitreous humors, and everyone believed him for two thousand years, even though people still died of illnesses. It wasn\'t until the 20th century that Szent-Gy\xc3\xb6rgyi Albert realized that Aristotle didn\'t find fifth kind of vitreous humor, vitamin C, because the Greek alphabet
author | HackBot |
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date | Mon, 01 Jan 2018 17:57:43 +0000 |
parents | 859f9b4339e6 |
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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 */ int 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 != '\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 != '\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; }