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author | 2021-05-09 14:20:58 -0400 | |
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committer | 2021-05-09 14:20:58 -0400 | |
commit | 5fd83771641d15c418f747bd343ba6738d3875f7 (patch) | |
tree | 5abf0f78f680d9837dbd93d4d4c3933bb7509599 /shell_cmds/printenv/printenv.c | |
download | apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.gz apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.zst apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.zip |
Import macOS userland
adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106
Diffstat (limited to 'shell_cmds/printenv/printenv.c')
-rw-r--r-- | shell_cmds/printenv/printenv.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/shell_cmds/printenv/printenv.c b/shell_cmds/printenv/printenv.c new file mode 100644 index 0000000..315833e --- /dev/null +++ b/shell_cmds/printenv/printenv.c @@ -0,0 +1,99 @@ +/*- + * 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. + * 4. 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. + */ + +#ifndef lint +static const char copyright[] = +"@(#) Copyright (c) 1987, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#if 0 +#ifndef lint +static char sccsid[] = "@(#)printenv.c 8.2 (Berkeley) 5/4/95"; +#endif /* not lint */ +#endif + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +void usage(void); +extern char **environ; + +/* + * printenv + * + * Bill Joy, UCB + * February, 1979 + */ +int +main(int argc, char *argv[]) +{ + 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); + } + 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); +} + +void +usage(void) +{ + (void)fprintf(stderr, "usage: printenv [name]\n"); + exit(1); +} |