diff options
Diffstat (limited to 'shell_cmds/env/env.c')
| -rw-r--r-- | shell_cmds/env/env.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/shell_cmds/env/env.c b/shell_cmds/env/env.c new file mode 100644 index 0000000..3dc152a --- /dev/null +++ b/shell_cmds/env/env.c @@ -0,0 +1,144 @@ +/* + * Copyright (c) 1988, 1993, 1994 + * 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) 1988, 1993, 1994\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#if 0 +#ifndef lint +static char sccsid[] = "@(#)env.c 8.3 (Berkeley) 4/2/94"; +#endif /* not lint */ +#endif + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <err.h> +#include <errno.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> + +#include "envopts.h" + +extern char **environ; + +int env_verbosity; + +static void usage(void); + +int +main(int argc, char **argv) +{ + char *altpath, **ep, *p, **parg; + char *cleanenv[1]; + int ch, want_clear; + int rtrn; + + altpath = NULL; + want_clear = 0; + while ((ch = getopt(argc, argv, "-iP:S:u:v")) != -1) + switch(ch) { + case '-': + case 'i': + want_clear = 1; + break; + case 'P': + altpath = strdup(optarg); + break; + case 'S': + /* + * The -S option, for "split string on spaces, with + * support for some simple substitutions"... + */ + split_spaces(optarg, &optind, &argc, &argv); + break; + case 'u': + if (env_verbosity) + fprintf(stderr, "#env unset:\t%s\n", optarg); + rtrn = unsetenv(optarg); + if (rtrn == -1) + err(EXIT_FAILURE, "unsetenv %s", optarg); + break; + case 'v': + env_verbosity++; + if (env_verbosity > 1) + fprintf(stderr, "#env verbosity now at %d\n", + env_verbosity); + break; + case '?': + default: + usage(); + } + if (want_clear) { + environ = cleanenv; + cleanenv[0] = NULL; + if (env_verbosity) + fprintf(stderr, "#env clearing environ\n"); + } + for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) { + if (env_verbosity) + fprintf(stderr, "#env setenv:\t%s\n", *argv); + *p = '\0'; + rtrn = setenv(*argv, p + 1, 1); + *p = '='; + if (rtrn == -1) + err(EXIT_FAILURE, "setenv %s", *argv); + } + if (*argv) { + if (altpath) + search_paths(altpath, argv); + if (env_verbosity) { + fprintf(stderr, "#env executing:\t%s\n", *argv); + for (parg = argv, argc = 0; *parg; parg++, argc++) + fprintf(stderr, "#env arg[%d]=\t'%s'\n", + argc, *parg); + if (env_verbosity > 1) + sleep(1); + } + execvp(*argv, argv); + err(errno == ENOENT ? 127 : 126, "%s", *argv); + } + for (ep = environ; *ep; ep++) + (void)printf("%s\n", *ep); + exit(0); +} + +static void +usage(void) +{ + (void)fprintf(stderr, + "usage: env [-iv] [-P utilpath] [-S string] [-u name]\n" + " [name=value ...] [utility [argument ...]]\n"); + exit(1); +} |