Damien Miller | 2c9279f | 2000-03-26 12:12:34 +1000 | [diff] [blame] | 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. |
Damien Miller | 329638e | 2003-06-03 12:12:50 +1000 | [diff] [blame] | 13 | * 3. Neither the name of the University nor the names of its contributors |
Damien Miller | 2c9279f | 2000-03-26 12:12:34 +1000 | [diff] [blame] | 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 | |
Ben Lindstrom | dd21fe9 | 2002-06-27 18:23:20 +0000 | [diff] [blame] | 30 | #include "includes.h" |
Damien Miller | 2c9279f | 2000-03-26 12:12:34 +1000 | [diff] [blame] | 31 | #ifndef HAVE_SETENV |
| 32 | |
| 33 | #if defined(LIBC_SCCS) && !defined(lint) |
Damien Miller | 329638e | 2003-06-03 12:12:50 +1000 | [diff] [blame] | 34 | static char *rcsid = "$OpenBSD: setenv.c,v 1.6 2003/06/02 20:18:38 millert Exp $"; |
Damien Miller | 2c9279f | 2000-03-26 12:12:34 +1000 | [diff] [blame] | 35 | #endif /* LIBC_SCCS and not lint */ |
| 36 | |
| 37 | #include <stdlib.h> |
| 38 | #include <string.h> |
| 39 | |
Damien Miller | 13dd03a | 2003-01-08 11:16:48 +1100 | [diff] [blame] | 40 | char *__findenv(const char *name, int *offset); |
| 41 | |
Damien Miller | 2c9279f | 2000-03-26 12:12:34 +1000 | [diff] [blame] | 42 | /* |
| 43 | * __findenv -- |
| 44 | * Returns pointer to value associated with name, if any, else NULL. |
| 45 | * Sets offset to be the offset of the name/value combination in the |
| 46 | * environmental array, for use by setenv(3) and unsetenv(3). |
| 47 | * Explicitly removes '=' in argument name. |
| 48 | * |
| 49 | * This routine *should* be a static; don't use it. |
| 50 | */ |
| 51 | char * |
| 52 | __findenv(name, offset) |
| 53 | register const char *name; |
| 54 | int *offset; |
| 55 | { |
| 56 | extern char **environ; |
| 57 | register int len, i; |
| 58 | register const char *np; |
| 59 | register char **p, *cp; |
| 60 | |
| 61 | if (name == NULL || environ == NULL) |
| 62 | return (NULL); |
| 63 | for (np = name; *np && *np != '='; ++np) |
| 64 | ; |
| 65 | len = np - name; |
| 66 | for (p = environ; (cp = *p) != NULL; ++p) { |
| 67 | for (np = name, i = len; i && *cp; i--) |
| 68 | if (*cp++ != *np++) |
| 69 | break; |
| 70 | if (i == 0 && *cp++ == '=') { |
| 71 | *offset = p - environ; |
| 72 | return (cp); |
| 73 | } |
| 74 | } |
| 75 | return (NULL); |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * setenv -- |
| 80 | * Set the value of the environmental variable "name" to be |
| 81 | * "value". If rewrite is set, replace any current value. |
| 82 | */ |
| 83 | int |
| 84 | setenv(name, value, rewrite) |
| 85 | register const char *name; |
| 86 | register const char *value; |
| 87 | int rewrite; |
| 88 | { |
| 89 | extern char **environ; |
| 90 | static int alloced; /* if allocated space before */ |
| 91 | register char *C; |
| 92 | int l_value, offset; |
Damien Miller | 2c9279f | 2000-03-26 12:12:34 +1000 | [diff] [blame] | 93 | |
| 94 | if (*value == '=') /* no `=' in value */ |
| 95 | ++value; |
| 96 | l_value = strlen(value); |
| 97 | if ((C = __findenv(name, &offset))) { /* find if already exists */ |
| 98 | if (!rewrite) |
| 99 | return (0); |
| 100 | if (strlen(C) >= l_value) { /* old larger; copy over */ |
Damien Miller | 8e3bdca | 2002-02-13 16:00:15 +1100 | [diff] [blame] | 101 | while ((*C++ = *value++)) |
| 102 | ; |
Damien Miller | 2c9279f | 2000-03-26 12:12:34 +1000 | [diff] [blame] | 103 | return (0); |
| 104 | } |
| 105 | } else { /* create new slot */ |
| 106 | register int cnt; |
| 107 | register char **P; |
| 108 | |
| 109 | for (P = environ, cnt = 0; *P; ++P, ++cnt); |
| 110 | if (alloced) { /* just increase size */ |
| 111 | P = (char **)realloc((void *)environ, |
| 112 | (size_t)(sizeof(char *) * (cnt + 2))); |
| 113 | if (!P) |
| 114 | return (-1); |
| 115 | environ = P; |
| 116 | } |
| 117 | else { /* get new space */ |
| 118 | alloced = 1; /* copy old entries into it */ |
| 119 | P = (char **)malloc((size_t)(sizeof(char *) * |
| 120 | (cnt + 2))); |
| 121 | if (!P) |
| 122 | return (-1); |
Ben Lindstrom | 4ffaad8 | 2001-02-19 19:54:43 +0000 | [diff] [blame] | 123 | memmove(P, environ, cnt * sizeof(char *)); |
Damien Miller | 2c9279f | 2000-03-26 12:12:34 +1000 | [diff] [blame] | 124 | environ = P; |
| 125 | } |
| 126 | environ[cnt + 1] = NULL; |
| 127 | offset = cnt; |
| 128 | } |
| 129 | for (C = (char *)name; *C && *C != '='; ++C); /* no `=' in name */ |
| 130 | if (!(environ[offset] = /* name + `=' + value */ |
| 131 | malloc((size_t)((int)(C - name) + l_value + 2)))) |
| 132 | return (-1); |
| 133 | for (C = environ[offset]; (*C = *name++) && *C != '='; ++C) |
| 134 | ; |
| 135 | for (*C++ = '='; (*C++ = *value++); ) |
| 136 | ; |
| 137 | return (0); |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * unsetenv(name) -- |
| 142 | * Delete environmental variable "name". |
| 143 | */ |
| 144 | void |
| 145 | unsetenv(name) |
| 146 | const char *name; |
| 147 | { |
| 148 | extern char **environ; |
| 149 | register char **P; |
| 150 | int offset; |
| 151 | char *__findenv(); |
| 152 | |
| 153 | while (__findenv(name, &offset)) /* if set multiple times */ |
| 154 | for (P = &environ[offset];; ++P) |
| 155 | if (!(*P = *(P + 1))) |
| 156 | break; |
| 157 | } |
| 158 | |
| 159 | #endif /* HAVE_SETENV */ |