| /* $NetBSD: printenv.c,v 1.12 2011/09/06 18:26:55 joerg Exp $ */ |
| |
| /* |
| * Copyright (c) 1987, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <sys/cdefs.h> |
| #ifndef lint |
| __COPYRIGHT("@(#) Copyright (c) 1987, 1993\ |
| The Regents of the University of California. All rights reserved."); |
| #endif /* not lint */ |
| |
| #ifndef lint |
| /*static char sccsid[] = "from: @(#)printenv.c 8.2 (Berkeley) 5/4/95";*/ |
| __RCSID("$NetBSD: printenv.c,v 1.12 2011/09/06 18:26:55 joerg Exp $"); |
| #endif /* not lint */ |
| |
| #include <sys/types.h> |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <err.h> |
| |
| __dead static void usage(void); |
| |
| /* |
| * printenv |
| * |
| * Bill Joy, UCB |
| * February, 1979 |
| */ |
| int |
| main(int argc, char *argv[]) |
| { |
| extern char **environ; |
| char *cp, **ep; |
| size_t len; |
| int ch; |
| |
| while ((ch = getopt(argc, argv, "")) != -1) |
| switch(ch) { |
| case '?': |
| default: |
| usage(); |
| } |
| argc -= optind; |
| argv += optind; |
| |
| if (argc == 0) { |
| for (ep = environ; *ep; ep++) |
| (void)printf("%s\n", *ep); |
| exit(0); |
| } |
| if (argc != 1) |
| usage(); |
| if (strchr(*argv, '=') != NULL) |
| errx(1, "Invalid environment variable %s", *argv); |
| len = strlen(*argv); |
| for (ep = environ; *ep; ep++) |
| if (!memcmp(*ep, *argv, len)) { |
| cp = *ep + len; |
| if (!*cp || *cp == '=') { |
| (void)printf("%s\n", *cp ? cp + 1 : cp); |
| exit(0); |
| } |
| } |
| exit(1); |
| } |
| |
| static void |
| usage(void) |
| { |
| (void)fprintf(stderr, "Usage: printenv [name]\n"); |
| exit(1); |
| } |