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Annotation of src/usr.bin/env/env.c, Revision 1.1

1.1     ! deraadt     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:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  */
        !            33:
        !            34: #ifndef lint
        !            35: static char copyright[] =
        !            36: "@(#) Copyright (c) 1988, 1993, 1994\n\
        !            37:        The Regents of the University of California.  All rights reserved.\n";
        !            38: #endif /* not lint */
        !            39:
        !            40: #ifndef lint
        !            41: /*static char sccsid[] = "@(#)env.c    8.3 (Berkeley) 4/2/94";*/
        !            42: static char rcsid[] = "$NetBSD: env.c,v 1.8 1995/09/28 07:34:39 perry Exp $";
        !            43: #endif /* not lint */
        !            44:
        !            45: #include <err.h>
        !            46: #include <stdio.h>
        !            47: #include <string.h>
        !            48: #include <stdlib.h>
        !            49: #include <unistd.h>
        !            50: #include <locale.h>
        !            51: #include <errno.h>
        !            52:
        !            53: static void usage __P((void));
        !            54:
        !            55: int
        !            56: main(argc, argv)
        !            57:        int argc;
        !            58:        char **argv;
        !            59: {
        !            60:        extern char **environ;
        !            61:        extern int errno, optind;
        !            62:        char **ep, *p;
        !            63:        char *cleanenv[1];
        !            64:        int ch;
        !            65:
        !            66:        setlocale(LC_ALL, "");
        !            67:
        !            68:        while ((ch = getopt(argc, argv, "-i")) != -1)
        !            69:                switch((char)ch) {
        !            70:                case '-':                       /* obsolete */
        !            71:                case 'i':
        !            72:                        environ = cleanenv;
        !            73:                        cleanenv[0] = NULL;
        !            74:                        break;
        !            75:                case '?':
        !            76:                default:
        !            77:                        usage();
        !            78:                }
        !            79:
        !            80:        for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv)
        !            81:                (void)setenv(*argv, ++p, 1);
        !            82:
        !            83:        if (*argv) {
        !            84:                /* return 127 if the command to be run could not be found; 126
        !            85:                   if the command was was found but could not be invoked */
        !            86:
        !            87:                execvp(*argv, argv);
        !            88:                err((errno == ENOENT) ? 127 : 126, "%s", *argv);
        !            89:                /* NOTREACHED */
        !            90:        }
        !            91:
        !            92:        for (ep = environ; *ep; ep++)
        !            93:                (void)printf("%s\n", *ep);
        !            94:
        !            95:        exit(0);
        !            96: }
        !            97:
        !            98: static void
        !            99: usage ()
        !           100: {
        !           101:        (void) fprintf(stderr, "usage: env [-i] [name=value ...] [command]\n");
        !           102:        exit (1);
        !           103: }