findme.c File Reference

Detailed Description

Definition in file findme.c.

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

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Functions

const char * findProgramPath (const char *argv0)

Function Documentation

const char* findProgramPath ( const char *  argv0  ) 

Return absolute path to executable by searching PATH.

Parameters:
argv0 name of executable
Returns:
(malloc'd) absolute path to executable (or NULL)

Definition at line 12 of file findme.c.

References alloca(), buf, and xstrdup.

00012                                                  {
00013     char * path = getenv("PATH");
00014     char * pathbuf;
00015     char * start, * chptr;
00016     char * buf;
00017 
00018     if (argv0 == NULL) return NULL;     /* XXX can't happen */
00019     /* If there is a / in the argv[0], it has to be an absolute path */
00020     if (strchr(argv0, '/'))
00021         return xstrdup(argv0);
00022 
00023     if (path == NULL) return NULL;
00024 
00025     start = pathbuf = alloca(strlen(path) + 1);
00026     buf = malloc(strlen(path) + strlen(argv0) + sizeof("/"));
00027     if (buf == NULL) return NULL;       /* XXX can't happen */
00028     strcpy(pathbuf, path);
00029 
00030     chptr = NULL;
00031     /*@-branchstate@*/
00032     do {
00033         if ((chptr = strchr(start, ':')))
00034             *chptr = '\0';
00035         sprintf(buf, "%s/%s", start, argv0);
00036 
00037         if (!access(buf, X_OK))
00038             return buf;
00039 
00040         if (chptr) 
00041             start = chptr + 1;
00042         else
00043             start = NULL;
00044     } while (start && *start);
00045     /*@=branchstate@*/
00046 
00047     free(buf);
00048 
00049     return NULL;
00050 }

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