Initial revision

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@253 72102866-910b-0410-8b05-ffd578937521

Source/find_exec.c

@@ -0,0 +1,139 @@
+/*
+    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;
+    
+    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)
+	    getcwd (name, MAXPATHLEN);
+	
+	strcat (name, "/");
+	strcat (name, file);
+	      
+/*
+	if (access (name, X_OK) == 0)
+*/
+	if (find_full_path (name) == 0)
+	    return copy_of (name);
+    }
+
+    return 0;
+}