Annotation of prex-old/usr/lib/libc/stdlib/getenv.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 1987, 1993
! 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. Neither the name of the University nor the names of its contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <stdlib.h>
! 31: #include <stddef.h>
! 32: #include <string.h>
! 33:
! 34: extern char **environ;
! 35:
! 36: char *__findenv(const char *, int *);
! 37:
! 38: /*
! 39: * getenv --
! 40: * Returns ptr to value associated with name, if any, else NULL.
! 41: */
! 42: char *
! 43: getenv(name)
! 44: const char *name;
! 45: {
! 46: int offset;
! 47:
! 48: return (__findenv(name, &offset));
! 49: }
! 50:
! 51: /*
! 52: * __findenv --
! 53: * Returns pointer to value associated with name, if any, else NULL.
! 54: * Sets offset to be the offset of the name/value combination in the
! 55: * environmental array, for use by setenv(3) and unsetenv(3).
! 56: * Explicitly removes '=' in argument name.
! 57: *
! 58: * This routine *should* be a static; don't use it.
! 59: */
! 60: char *
! 61: __findenv(name, offset)
! 62: const char *name;
! 63: int *offset;
! 64: {
! 65: size_t len;
! 66: const char *np;
! 67: char **p, *c;
! 68:
! 69: if (name == NULL || environ == NULL)
! 70: return (NULL);
! 71: for (np = name; *np && *np != '='; ++np)
! 72: continue;
! 73: len = np - name;
! 74: for (p = environ; (c = *p) != NULL; ++p)
! 75: if (strncmp(c, name, len) == 0 && c[len] == '=') {
! 76: *offset = p - environ;
! 77: return (c + len + 1);
! 78: }
! 79: return (NULL);
! 80: }
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