1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright (c) 1994, by Sun Microsytems, Inc.
24 */
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI"
27
28/*
29 * interfaces to find an executable (from libc code)
30 */
31
32/* Copyright (c) 1988 AT&T */
33/* All Rights Reserved   */
34
35
36#include <unistd.h>
37#include <stdlib.h>
38#include <string.h>
39#include <errno.h>
40#include <limits.h>
41#include <sys/types.h>
42#include <sys/stat.h>
43
44#include "prb_proc_int.h"
45
46static const char *exec_cat(const char *s1, const char *s2, char *si);
47
48prb_status_t
49find_executable(const char *name, char *ret_path)
50{
51	const char	 *pathstr;
52	char		fname[PATH_MAX + 2];
53	const char	 *cp;
54	struct stat	 stat_buf;
55
56	if (*name == '\0') {
57		return (prb_status_map(ENOENT));
58	}
59	if ((pathstr = getenv("PATH")) == NULL) {
60		if (geteuid() == 0 || getuid() == 0)
61			pathstr = "/usr/sbin:/usr/bin";
62		else
63			pathstr = "/usr/bin:";
64	}
65	cp = strchr(name, '/') ? (const char *) "" : pathstr;
66
67	do {
68		cp = exec_cat(cp, name, fname);
69		if (stat(fname, &stat_buf) != -1) {
70			/* successful find of the file */
71			(void) strncpy(ret_path, fname, PATH_MAX + 2);
72			return (PRB_STATUS_OK);
73		}
74	} while (cp);
75
76	return (prb_status_map(ENOENT));
77}
78
79
80
81static const char *
82exec_cat(const char *s1, const char *s2, char *si)
83{
84	char		   *s;
85	/* number of characters in s2 */
86	int			 cnt = PATH_MAX + 1;
87
88	s = si;
89	while (*s1 && *s1 != ':') {
90		if (cnt > 0) {
91			*s++ = *s1++;
92			cnt--;
93		} else
94			s1++;
95	}
96	if (si != s && cnt > 0) {
97		*s++ = '/';
98		cnt--;
99	}
100	while (*s2 && cnt > 0) {
101		*s++ = *s2++;
102		cnt--;
103	}
104	*s = '\0';
105	return (*s1 ? ++s1 : 0);
106}
107