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

1.1     ! deraadt     1: /*
        !             2:  * Copyright (c) 1987 Regents of the University of California.
        !             3:  * 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: char copyright[] =
        !            36: "@(#) Copyright (c) 1987 Regents of the University of California.\n\
        !            37:  All rights reserved.\n";
        !            38: #endif /* not lint */
        !            39:
        !            40: #ifndef lint
        !            41: /*static char sccsid[] = "from: @(#)printenv.c 5.4 (Berkeley) 6/1/90";*/
        !            42: static char rcsid[] = "$Id: printenv.c,v 1.4 1993/12/31 19:28:15 jtc Exp $";
        !            43: #endif /* not lint */
        !            44:
        !            45: #include <stdio.h>
        !            46: #include <string.h>
        !            47: #include <stdlib.h>
        !            48:
        !            49: /*
        !            50:  * printenv
        !            51:  *
        !            52:  * Bill Joy, UCB
        !            53:  * February, 1979
        !            54:  */
        !            55: int
        !            56: main(argc, argv)
        !            57:        int argc;
        !            58:        char **argv;
        !            59: {
        !            60:        extern char **environ;
        !            61:        register char *cp, **ep;
        !            62:        register int len;
        !            63:
        !            64:        if (argc < 2) {
        !            65:                for (ep = environ; *ep; ep++)
        !            66:                        puts(*ep);
        !            67:                exit(0);
        !            68:        }
        !            69:        len = strlen(*++argv);
        !            70:        for (ep = environ; *ep; ep++)
        !            71:                if (!strncmp(*ep, *argv, len)) {
        !            72:                        cp = *ep + len;
        !            73:                        if (!*cp || *cp == '=') {
        !            74:                                puts(*cp ? cp + 1 : cp);
        !            75:                                exit(0);
        !            76:                        }
        !            77:                }
        !            78:        exit(1);
        !            79: }