env.c revision 169145 
1/*
2 * Copyright (c) 1988, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1988, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#if 0
41#ifndef lint
42static char sccsid[] = "@(#)env.c	8.3 (Berkeley) 4/2/94";
43#endif /* not lint */
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.bin/env/env.c 169145 2007-04-30 19:25:00Z ache $");
48
49#include <err.h>
50#include <errno.h>
51#include <stdio.h>
52#include <string.h>
53#include <stdlib.h>
54#include <unistd.h>
55
56#include "envopts.h"
57
58extern char **environ;
59
60int	 env_verbosity;
61
62static void usage(void);
63
64int
65main(int argc, char **argv)
66{
67	char *altpath, **ep, **parg;
68	char *cleanenv[1];
69	int ch, want_clear;
70
71	altpath = NULL;
72	want_clear = 0;
73	while ((ch = getopt(argc, argv, "-iP:S:v")) != -1)
74		switch(ch) {
75		case '-':
76		case 'i':
77			want_clear = 1;
78			break;
79		case 'P':
80			altpath = strdup(optarg);
81			break;
82		case 'S':
83			/*
84			 * The -S option, for "split string on spaces, with
85			 * support for some simple substitutions"...
86			 */
87			split_spaces(optarg, &optind, &argc, &argv);
88			break;
89		case 'v':
90			env_verbosity++;
91			if (env_verbosity > 1)
92				fprintf(stderr, "#env verbosity now at %d\n",
93				    env_verbosity);
94			break;
95		case '?':
96		default:
97			usage();
98		}
99	if (want_clear) {
100		environ = cleanenv;
101		cleanenv[0] = NULL;
102		if (env_verbosity)
103			fprintf(stderr, "#env clearing environ\n");
104	}
105	for (argv += optind; *argv && strchr(*argv, '=') != NULL; ++argv) {
106		if (env_verbosity)
107			fprintf(stderr, "#env setenv:\t%s\n", *argv);
108		(void)putenv(strdup(*argv));
109	}
110	if (*argv) {
111		if (altpath)
112			search_paths(altpath, argv);
113		if (env_verbosity) {
114			fprintf(stderr, "#env executing:\t%s\n", *argv);
115			for (parg = argv, argc = 0; *parg; parg++, argc++)
116				fprintf(stderr, "#env    arg[%d]=\t'%s'\n",
117				    argc, *parg);
118			if (env_verbosity > 1)
119				sleep(1);
120		}
121		execvp(*argv, argv);
122		err(errno == ENOENT ? 127 : 126, "%s", *argv);
123	}
124	for (ep = environ; *ep; ep++)
125		(void)printf("%s\n", *ep);
126	exit(0);
127}
128
129static void
130usage(void)
131{
132	(void)fprintf(stderr,
133	    "usage: env [-iv] [-P utilpath] [-S string] [name=value ...]"
134	    " [utility [argument ...]]\n");
135	exit(1);
136}
137