env.c revision 331722 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1988, 1993, 1994\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)env.c	8.3 (Berkeley) 4/2/94";
39#endif /* not lint */
40#endif
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: stable/11/usr.bin/env/env.c 331722 2018-03-29 02:50:57Z eadler $");
44
45#include <err.h>
46#include <errno.h>
47#include <stdio.h>
48#include <string.h>
49#include <stdlib.h>
50#include <unistd.h>
51
52#include "envopts.h"
53
54extern char **environ;
55
56int	 env_verbosity;
57
58static void usage(void);
59
60int
61main(int argc, char **argv)
62{
63	char *altpath, **ep, *p, **parg;
64	char *cleanenv[1];
65	int ch, want_clear;
66	int rtrn;
67
68	altpath = NULL;
69	want_clear = 0;
70	while ((ch = getopt(argc, argv, "-iP:S:u:v")) != -1)
71		switch(ch) {
72		case '-':
73		case 'i':
74			want_clear = 1;
75			break;
76		case 'P':
77			altpath = strdup(optarg);
78			break;
79		case 'S':
80			/*
81			 * The -S option, for "split string on spaces, with
82			 * support for some simple substitutions"...
83			 */
84			split_spaces(optarg, &optind, &argc, &argv);
85			break;
86		case 'u':
87			if (env_verbosity)
88				fprintf(stderr, "#env unset:\t%s\n", optarg);
89			rtrn = unsetenv(optarg);
90			if (rtrn == -1)
91				err(EXIT_FAILURE, "unsetenv %s", optarg);
92			break;
93		case 'v':
94			env_verbosity++;
95			if (env_verbosity > 1)
96				fprintf(stderr, "#env verbosity now at %d\n",
97				    env_verbosity);
98			break;
99		case '?':
100		default:
101			usage();
102		}
103	if (want_clear) {
104		environ = cleanenv;
105		cleanenv[0] = NULL;
106		if (env_verbosity)
107			fprintf(stderr, "#env clearing environ\n");
108	}
109	for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) {
110		if (env_verbosity)
111			fprintf(stderr, "#env setenv:\t%s\n", *argv);
112		*p = '\0';
113		rtrn = setenv(*argv, p + 1, 1);
114		*p = '=';
115		if (rtrn == -1)
116			err(EXIT_FAILURE, "setenv %s", *argv);
117	}
118	if (*argv) {
119		if (altpath)
120			search_paths(altpath, argv);
121		if (env_verbosity) {
122			fprintf(stderr, "#env executing:\t%s\n", *argv);
123			for (parg = argv, argc = 0; *parg; parg++, argc++)
124				fprintf(stderr, "#env    arg[%d]=\t'%s'\n",
125				    argc, *parg);
126			if (env_verbosity > 1)
127				sleep(1);
128		}
129		execvp(*argv, argv);
130		err(errno == ENOENT ? 127 : 126, "%s", *argv);
131	}
132	for (ep = environ; *ep; ep++)
133		(void)printf("%s\n", *ep);
134	exit(0);
135}
136
137static void
138usage(void)
139{
140	(void)fprintf(stderr,
141	    "usage: env [-iv] [-P utilpath] [-S string] [-u name]\n"
142	    "           [name=value ...] [utility [argument ...]]\n");
143	exit(1);
144}
145