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Annotation of src/usr.bin/env/env.c, Revision 1.17

1.17    ! schwarze    1: /*     $OpenBSD: env.c,v 1.16 2015/10/10 21:19:14 deraadt Exp $        */
1.3       deraadt     2:
1.1       deraadt     3: /*
                      4:  * Copyright (c) 1988, 1993, 1994
                      5:  *     The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
1.9       millert    15:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
                     32: #include <err.h>
1.11      ray        33: #include <errno.h>
1.1       deraadt    34: #include <stdio.h>
1.11      ray        35: #include <stdlib.h>
1.1       deraadt    36: #include <string.h>
                     37: #include <unistd.h>
                     38:
1.17    ! schwarze   39: static void __dead usage(void);
1.1       deraadt    40:
                     41: int
1.10      deraadt    42: main(int argc, char *argv[])
1.1       deraadt    43: {
                     44:        extern char **environ;
1.2       deraadt    45:        extern int optind;
1.1       deraadt    46:        char **ep, *p;
                     47:        int ch;
                     48:
1.16      deraadt    49:        if (pledge("stdio exec", NULL) == -1)
                     50:                err(1, "pledge");
1.1       deraadt    51:
1.12      ray        52:        while ((ch = getopt(argc, argv, "i-")) != -1)
1.11      ray        53:                switch(ch) {
1.12      ray        54:                case '-':                       /* obsolete */
1.1       deraadt    55:                case 'i':
1.11      ray        56:                        if ((environ = calloc(1, sizeof(char *))) == NULL)
1.5       deraadt    57:                                err(126, "calloc");
1.1       deraadt    58:                        break;
                     59:                default:
                     60:                        usage();
                     61:                }
1.11      ray        62:        argc -= optind;
                     63:        argv += optind;
1.1       deraadt    64:
1.13      millert    65:        for (; *argv && (p = strchr(*argv, '=')); ++argv) {
                     66:                *p++ = '\0';
                     67:                if (setenv(*argv, p, 1) == -1) {
1.5       deraadt    68:                        /* reuse 126, it matches the problem most */
1.15      schwarze   69:                        err(126, "setenv");
1.5       deraadt    70:                }
1.13      millert    71:        }
1.1       deraadt    72:
                     73:        if (*argv) {
1.5       deraadt    74:                /*
                     75:                 * return 127 if the command to be run could not be
                     76:                 * found; 126 if the command was found but could
                     77:                 * not be invoked
                     78:                 */
1.1       deraadt    79:                execvp(*argv, argv);
                     80:                err((errno == ENOENT) ? 127 : 126, "%s", *argv);
                     81:        }
                     82:
                     83:        for (ep = environ; *ep; ep++)
                     84:                (void)printf("%s\n", *ep);
                     85:
1.17    ! schwarze   86:        return 0;
1.1       deraadt    87: }
                     88:
1.17    ! schwarze   89: static void __dead
1.10      deraadt    90: usage(void)
1.1       deraadt    91: {
1.11      ray        92:        extern char *__progname;
                     93:
                     94:        (void)fprintf(stderr, "usage: %s [-i] [name=value ...] "
                     95:            "[utility [argument ...]]\n", __progname);
                     96:        exit(1);
1.1       deraadt    97: }