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copied!<p>Here's what I normally use. If I were doing it again today, I'd probably do it a bit differently, but it works well enough that I haven't really had any reason to look at it for years (in fact, I'm pretty sure the last time I did <em>anything</em> to it was adding "cmd" to the list of extensions when I ported it from DOS to Win32...</p> <pre><code>// Which.c: #include <io.h> #include <stdio.h> #include <string.h> #include <stdlib.h> char *extensions[] = { "com", "exe", "bat", "cmd", NULL }; int is_exe(char *ext) { int i; for ( i = 0; extensions[i]; i++) if ( 0 == stricmp(ext, extensions[i] ) ) return 1; return 0; } int main(int argc, char **argv) { char path[FILENAME_MAX]; char buffer[FILENAME_MAX]; char *path_var; char *ext; char *dir; int i; if (argc != 2) { fprintf(stderr, "Usage: which <filename>\n"); return 1; } /* First try to find file name as-is. */ if ( 0 == access(argv[1], 0)) { printf("\n%s", argv[1]); return 0; } /* Okay, it wasn't found. See if it had an extension, and if not, try * adding the usual ones... */ ext = strrchr(argv[1], '.' ); if ( 0 == ext++ || !is_exe(ext) ) { for ( i = 0; extensions[i]; i++) { sprintf(buffer, "%s.%s", argv[1], extensions[i]); if ( 0 == access(buffer, 0)) { printf("\n%s", buffer); return 0; } } if ( NULL == (path_var=getenv("PATH"))) return 1; dir = strtok(path_var, ";"); do { for ( i = 0; extensions[i]; i++) { sprintf(buffer, "%s\\%s.%s", dir, argv[1], extensions[i]); if ( 0 == access( buffer, 0)) { printf("\n%s", buffer); return 0; } } } while ( NULL != ( dir = strtok(NULL, ";"))); } else { if ( NULL == (path_var=getenv("PATH"))) return 1; dir = strtok(path_var, ";"); do { sprintf(buffer, "%s\\%s", dir, argv[1]); if ( 0 == access( buffer, 0)) { printf("\n%s", buffer); return 0; } } while ( NULL != ( dir = strtok(NULL, ";"))); } return 1; } </code></pre>

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