#define UTIL__C /* Some generally useful routines */ /* The majority of the non-portable code is in here. */ /* Copyright (c) 2001, Richard Krehbiel All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: o Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. o Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. o Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include "util.h" /* own defintions */ #ifdef WIN32 #include #include #define stat _stat #else #include #include #endif static void my_searchenv1( char *name, char *envname, char *hitfile, int hitlen); static void my_searchenv2( char *name, char *envname, char *hitfile, int hitlen); /* Sure, the library typically provides some kind of ultoa or _ultoa function. But since it's merely typical and not standard, and since the function is so simple, I'll write my own. It's significant feature is that it'll produce representations in any number base from 2 to 36. */ char *my_ultoa( unsigned long val, char *buf, unsigned int base) { static char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; char *strt = buf, *end; do { *buf++ = digits[val % base]; val /= base; } while (val != 0); *buf = 0; /* delimit */ end = buf + 1; /* Now reverse the bytes */ while (buf > strt) { char temp; temp = *--buf; *buf = *strt; *strt++ = temp; } return end; } /* Ditto my_ultoa. This actually emits a signed representation in other number bases. */ char *my_ltoa( long val, char *buf, unsigned int base) { unsigned long uval; if (val < 0) uval = -val, *buf++ = '-'; else uval = val; return my_ultoa(uval, buf, base); } /* _searchenv is a function provided by the MSVC library that finds files which may be anywhere along a path which appears in an environment variable. I duplicate that function for portability. Note also that mine avoids destination buffer overruns. Added functionality to lowercase the file name and to remove the device name and directory. */ void my_searchenv( char *name, char *envname, char *hitfile, int hitlen) { my_searchenv1(name, envname, hitfile, hitlen); if (*hitfile) { return; } char *copy = memcheck(strdup(name)); downcase(copy); my_searchenv1(copy, envname, hitfile, hitlen); free(copy); } static void my_searchenv1( char *name, char *envname, char *hitfile, int hitlen) { my_searchenv2(name, envname, hitfile, hitlen); if (*hitfile) { return; } /* * Parse DEV:[DIR]NAME * while re-trying the search after DEV: and after [DIR]. * * Let's not be too critical about the characters we allow in those. */ char *p = name; char c; while ((c = *p++)) { if (c == ':') { my_searchenv2(p, envname, hitfile, hitlen); if (*hitfile) { return; } } if (c == '[') { char *enddir = strchr(p, ']'); if (enddir == NULL) { return; /* weird syntax */ } p = enddir + 1; my_searchenv2(p, envname, hitfile, hitlen); return; } } return; } static void my_searchenv2( char *name, char *envname, char *hitfile, int hitlen) { char *env; char *envcopy; char *envcopy2; char *cp; char *last; *hitfile = 0; /* Default failure indication */ /* Note: If the given name is absolute, then don't search the path, but use it as is. */ if ( #ifdef WIN32 strchr(name, ':') != NULL || /* Contain a drive spec? */ name[0] == '\\' || /* Start with absolute ref? */ #endif name[0] == '/') { /* Start with absolute ref? */ strncpy(hitfile, name, hitlen); /* Copy to target */ return; } env = getenv(envname); if (env == NULL) { /* If not defined, search in */ env = "."; /* current directory */ } envcopy = strdup(env); /* strtok destroys its text argument. I don't want the return value from getenv destroyed. */ envcopy2 = envcopy; while ((cp = strtok_r(envcopy2, PATHSEP, &last)) != NULL) { struct stat info; char *concat = malloc(strlen(cp) + strlen(name) + 2); if (concat == NULL) { free(envcopy); return; } strcpy(concat, cp); if (concat[strlen(concat) - 1] != '/') strcat(concat, "/"); strcat(concat, name); if (!stat(concat, &info)) { /* Copy the file name to hitfile. Assure that it's really zero-delimited. */ strncpy(hitfile, concat, hitlen - 1); hitfile[hitlen - 1] = 0; free(envcopy); free(concat); return; } free(concat); envcopy2 = NULL; } /* If I fall out of that loop, then hitfile indicates no match, and return. */ free(envcopy); } /* memcheck - crash out if a pointer (returned from malloc) is NULL. */ void *memcheck( void *ptr) { if (ptr == NULL) { fprintf(stderr, "Out of memory.\n"); exit(EXIT_FAILURE); } return ptr; } /* upcase turns a string to upper case */ void upcase( char *str) { while (*str) { *str = toupper((unsigned char)*str); str++; } } /* downcase turns a string to lower case */ void downcase( char *str) { while (*str) { *str = tolower((unsigned char)*str); str++; } } /* padto adds blanks to the end of a string until it's the given length. */ void padto( char *str, int to) { int needspace = to - strlen(str); str += strlen(str); while (needspace > 0) *str++ = ' ', needspace--; *str = 0; } /* defext adds the supplied extension to the file name if it doesn't already have one. "ext" is the desired extension, without the period. The file name must be in a malloc'ed buffer. The resulting string address is returned. */ char *defext (char *fn, const char *ext) { char *ret; if (strchr (fn, '.')) return fn; ret = realloc (fn, strlen (fn) + strlen (ext) + 2); if (ret == NULL) return ret; strcat (ret, "."); strcat (ret, ext); return ret; }