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Annotation of src/usr.bin/printenv/printenv.c, Revision 1.8

1.8     ! deraadt     1: /*     $OpenBSD: printenv.c,v 1.7 2015/10/07 06:35:19 deraadt Exp $    */
1.2       deraadt     2:
1.1       deraadt     3: /*
                      4:  * Copyright (c) 1987 Regents of the University of California.
                      5:  * 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.
1.4       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 <stdio.h>
                     33: #include <string.h>
                     34: #include <stdlib.h>
1.7       deraadt    35: #include <unistd.h>
                     36: #include <err.h>
1.1       deraadt    37:
                     38: /*
                     39:  * printenv
                     40:  *
                     41:  * Bill Joy, UCB
                     42:  * February, 1979
                     43:  */
                     44: int
1.5       deraadt    45: main(int argc, char *argv[])
1.1       deraadt    46: {
                     47:        extern char **environ;
1.3       mpech      48:        char *cp, **ep;
                     49:        int len;
1.7       deraadt    50:
1.8     ! deraadt    51:        if (pledge("stdio", NULL) == -1)
        !            52:                err(1, "pledge");
1.1       deraadt    53:
                     54:        if (argc < 2) {
                     55:                for (ep = environ; *ep; ep++)
                     56:                        puts(*ep);
                     57:                exit(0);
                     58:        }
                     59:        len = strlen(*++argv);
                     60:        for (ep = environ; *ep; ep++)
                     61:                if (!strncmp(*ep, *argv, len)) {
                     62:                        cp = *ep + len;
                     63:                        if (!*cp || *cp == '=') {
                     64:                                puts(*cp ? cp + 1 : cp);
                     65:                                exit(0);
                     66:                        }
                     67:                }
                     68:        exit(1);
                     69: }