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Annotation of src/lib/libc/stdlib/getenv.c, Revision 1.7

1.7     ! cgd         1: /*     $NetBSD: getenv.c,v 1.6 1995/12/28 08:52:18 thorpej Exp $       */
1.6       thorpej     2:
1.1       cgd         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.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #if defined(LIBC_SCCS) && !defined(lint)
1.6       thorpej    37: #if 0
                     38: static char *sccsid = "from: @(#)getenv.c      5.8 (Berkeley) 2/23/91";
                     39: #else
1.7     ! cgd        40: static char *rcsid = "$NetBSD: getenv.c,v 1.6 1995/12/28 08:52:18 thorpej Exp $";
1.6       thorpej    41: #endif
1.1       cgd        42: #endif /* LIBC_SCCS and not lint */
                     43:
                     44: #include <stdlib.h>
                     45: #include <string.h>
                     46:
                     47: /*
                     48:  * getenv --
                     49:  *     Returns ptr to value associated with name, if any, else NULL.
                     50:  */
                     51: char *
                     52: getenv(name)
                     53:        const char *name;
                     54: {
                     55:        int offset;
1.4       jtc        56:        char *__findenv();
1.1       cgd        57:
1.4       jtc        58:        return(__findenv(name, &offset));
1.1       cgd        59: }
                     60:
                     61: /*
1.4       jtc        62:  * __findenv --
1.1       cgd        63:  *     Returns pointer to value associated with name, if any, else NULL.
                     64:  *     Sets offset to be the offset of the name/value combination in the
                     65:  *     environmental array, for use by setenv(3) and unsetenv(3).
                     66:  *     Explicitly removes '=' in argument name.
                     67:  *
                     68:  *     This routine *should* be a static; don't use it.
                     69:  */
                     70: char *
1.4       jtc        71: __findenv(name, offset)
1.7     ! cgd        72:        register const char *name;
1.1       cgd        73:        int *offset;
                     74: {
                     75:        extern char **environ;
                     76:        register int len;
                     77:        register char **P, *C;
1.7     ! cgd        78:        register const char *tmp;
1.1       cgd        79:
1.7     ! cgd        80:        for (tmp = name, len = 0; *tmp && *tmp != '='; ++tmp, ++len);
1.1       cgd        81:        for (P = environ; *P; ++P)
                     82:                if (!strncmp(*P, name, len))
                     83:                        if (*(C = *P + len) == '=') {
                     84:                                *offset = P - environ;
                     85:                                return(++C);
                     86:                        }
                     87:        return(NULL);
                     88: }