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/*
find_exec.c - routine to find the executable path
From the dld distribution -- copyrighted below.
Modified by Adam Fedor - traverse links
Given a filename, objc_find_executable searches the directories listed in
environment variable PATH for a file with that filename.
A new copy of the complete path name of that file is returned. This new
string may be disposed by free() later on.
*/
/* This file is part of DLD, a dynamic link/unlink editor for C.
Copyright (C) 1990 by W. Wilson Ho.
The author can be reached electronically by how@cs.ucdavis.edu or
through physical mail at:
W. Wilson Ho
Division of Computer Science
University of California at Davis
Davis, CA 95616
*/
/* 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 1, or (at your option) any
later version.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/param.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define DEFAULT_PATH ".:~/bin::/usr/local/bin:/usr/new:/usr/ucb:/usr/bin:/bin:/usr/hosts"
/* ABSOLUTE_FILENAME_P (fname): True if fname is an absolute filename */
#ifdef atarist
#define ABSOLUTE_FILENAME_P(fname) ((fname[0] == '/') || \
(fname[0] && (fname[1] == ':')))
#else
#define ABSOLUTE_FILENAME_P(fname) (fname[0] == '/')
#endif /* atarist */
static char *
copy_of (s)
register char *s;
{
register char *p = (char *) malloc (strlen(s)+1);
if (!p) return 0;
*p = 0;
strcpy (p, s);
return p;
}
static int
find_full_path(char *path)
{
struct stat statbuf;
if ( stat(path, &statbuf) != 0)
return -1;
if ( (lstat(path, &statbuf) == 0)
&& (statbuf.st_mode & S_IFLNK) == S_IFLNK) {
char link[MAXPATHLEN+1];
int cc;
cc = readlink(path, link, MAXPATHLEN);
if (cc == -1)
return -1;
link[cc] = '\0';
if (ABSOLUTE_FILENAME_P(link)) {
strcpy(path, link);
} else if (strlen(path)+strlen(link) < MAXPATHLEN) {
char *p;
p = strrchr(path, '/');
if (p)
*(p+1) = '\0';
strcat(path, link);
} else
return -1;
}
return 0;
}
char *
objc_find_executable (const char *file)
{
char *search;
register char *p;
int cwd_in_path = 0;
if (ABSOLUTE_FILENAME_P(file)) {
search = copy_of(file);
find_full_path(search);
return search;
/*
return copy_of (file);
*/
}
if ((search = (char *) getenv("PATH")) == 0)
search = DEFAULT_PATH;
p = search;
while (*p) {
char name[MAXPATHLEN];
register char *next;
next = name;
/* copy directory name into [name] */
while (*p && *p != ':') *next++ = *p++;
*next = 0;
if (*p) p++;
if (name[0] == '.' && name[1] == 0) {
#ifndef NeXT
getcwd (name, MAXPATHLEN);
#else
/*
Reported by Gregor Hoffleit <flight@mathi.uni-heidelberg.DE>
Date: Fri, 12 Jan 96 16:00:42 +0100
*/
getwd (name);
#endif
cwd_in_path = 1;
}
strcat (name, "/");
strcat (name, file);
/*
if (access (name, X_OK) == 0)
*/
if (find_full_path (name) == 0)
return copy_of (name);
}
/*
If '.' not in PATH, check this too
*/
if (!cwd_in_path) {
char name[MAXPATHLEN];
#ifndef NeXT
getcwd (name, MAXPATHLEN);
#else
getwd (name);
#endif
strcat (name, "/");
strcat (name, file);
/*
if (access (name, X_OK) == 0)
*/
if (find_full_path (name) == 0)
return copy_of (name);
}
return 0;
}
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