103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/* $NetBSD: printenv.c,v 1.11 2009/07/25 08:20:24 dholland Exp $ */
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/*
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* Copyright (c) 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1987, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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/*static char sccsid[] = "from: @(#)printenv.c 8.2 (Berkeley) 5/4/95";*/
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__RCSID("$NetBSD: printenv.c,v 1.11 2009/07/25 08:20:24 dholland Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <err.h>
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void usage(void);
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/*
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* printenv
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*
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* Bill Joy, UCB
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* February, 1979
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*/
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int
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main(int argc, char *argv[])
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{
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extern char **environ;
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char *cp, **ep;
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size_t len;
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int ch;
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while ((ch = getopt(argc, argv, "")) != -1)
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switch(ch) {
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc == 0) {
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for (ep = environ; *ep; ep++)
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(void)printf("%s\n", *ep);
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exit(0);
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}
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if (argc != 1)
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usage();
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if (strchr(*argv, '=') != NULL)
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errx(1, "Invalid environment variable %s", *argv);
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len = strlen(*argv);
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for (ep = environ; *ep; ep++)
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if (!memcmp(*ep, *argv, len)) {
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cp = *ep + len;
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if (!*cp || *cp == '=') {
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(void)printf("%s\n", *cp ? cp + 1 : cp);
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exit(0);
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}
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}
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exit(1);
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}
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void
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usage(void)
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{
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(void)fprintf(stderr, "Usage: printenv [name]\n");
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exit(1);
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}
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