source: trunk/third/popt/findme.c @ 15550

/* (C) 1998 Red Hat Software, Inc. -- Licensing details are in the COPYING
   file accompanying popt source distributions, available from 
   ftp://ftp.redhat.com/pub/code/popt */

#include "system.h"
#include "findme.h"

const char * findProgramPath(const char * argv0) {
    char * path = getenv("PATH");
    char * pathbuf;
    char * start, * chptr;
    char * buf;

    /* If there is a / in the argv[0], it has to be an absolute path */
    if (strchr(argv0, '/'))
        return xstrdup(argv0);

    if (!path) return NULL;

    start = pathbuf = alloca(strlen(path) + 1);
    buf = malloc(strlen(path) + strlen(argv0) + sizeof("/"));
    strcpy(pathbuf, path);

    chptr = NULL;
    do {
        if ((chptr = strchr(start, ':')))
            *chptr = '\0';
        sprintf(buf, "%s/%s", start, argv0);

        if (!access(buf, X_OK))
            return buf;

        if (chptr) 
            start = chptr + 1;
        else
            start = NULL;
    } while (start && *start);

    free(buf);

    return NULL;
}