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b69585d9 | 1 | /* $OpenBSD: setenv.c,v 1.9 2005/08/08 08:05:37 espie Exp $ */ |
f5238bee | 2 | /* |
3 | * Copyright (c) 1987 Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
3e67f7df | 14 | * 3. Neither the name of the University nor the names of its contributors |
f5238bee | 15 | * may be used to endorse or promote products derived from this software |
16 | * without specific prior written permission. | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
28 | * SUCH DAMAGE. | |
29 | */ | |
30 | ||
f6d4fb87 | 31 | /* OPENBSD ORIGINAL: lib/libc/stdlib/setenv.c */ |
32 | ||
17962c40 | 33 | #include "includes.h" |
351f44a0 | 34 | #if !defined(HAVE_SETENV) || !defined(HAVE_UNSETENV) |
f5238bee | 35 | |
f5238bee | 36 | #include <stdlib.h> |
37 | #include <string.h> | |
38 | ||
b69585d9 | 39 | extern char **environ; |
e1658b5c | 40 | |
b69585d9 | 41 | /* OpenSSH Portable: __findenv is from getenv.c rev 1.8, made static */ |
f5238bee | 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. | |
f5238bee | 48 | */ |
7b2dcf21 | 49 | static char * |
e1658b5c | 50 | __findenv(const char *name, int *offset) |
f5238bee | 51 | { |
52 | extern char **environ; | |
e1658b5c | 53 | int len, i; |
54 | const char *np; | |
55 | char **p, *cp; | |
f5238bee | 56 | |
57 | if (name == NULL || environ == NULL) | |
58 | return (NULL); | |
59 | for (np = name; *np && *np != '='; ++np) | |
60 | ; | |
61 | len = np - name; | |
62 | for (p = environ; (cp = *p) != NULL; ++p) { | |
63 | for (np = name, i = len; i && *cp; i--) | |
64 | if (*cp++ != *np++) | |
65 | break; | |
66 | if (i == 0 && *cp++ == '=') { | |
67 | *offset = p - environ; | |
68 | return (cp); | |
69 | } | |
70 | } | |
71 | return (NULL); | |
72 | } | |
73 | ||
351f44a0 | 74 | #ifndef HAVE_SETENV |
f5238bee | 75 | /* |
76 | * setenv -- | |
77 | * Set the value of the environmental variable "name" to be | |
78 | * "value". If rewrite is set, replace any current value. | |
79 | */ | |
80 | int | |
b69585d9 | 81 | setenv(const char *name, const char *value, int rewrite) |
f5238bee | 82 | { |
b69585d9 | 83 | static char **lastenv; /* last value of environ */ |
84 | char *C; | |
f5238bee | 85 | int l_value, offset; |
f5238bee | 86 | |
87 | if (*value == '=') /* no `=' in value */ | |
88 | ++value; | |
89 | l_value = strlen(value); | |
90 | if ((C = __findenv(name, &offset))) { /* find if already exists */ | |
91 | if (!rewrite) | |
92 | return (0); | |
93 | if (strlen(C) >= l_value) { /* old larger; copy over */ | |
1656cbed | 94 | while ((*C++ = *value++)) |
95 | ; | |
f5238bee | 96 | return (0); |
97 | } | |
98 | } else { /* create new slot */ | |
b69585d9 | 99 | size_t cnt; |
100 | char **P; | |
f5238bee | 101 | |
b69585d9 | 102 | for (P = environ; *P != NULL; P++) |
103 | ; | |
104 | cnt = P - environ; | |
105 | P = (char **)realloc(lastenv, sizeof(char *) * (cnt + 2)); | |
106 | if (!P) | |
107 | return (-1); | |
108 | if (lastenv != environ) | |
109 | memcpy(P, environ, cnt * sizeof(char *)); | |
110 | lastenv = environ = P; | |
f5238bee | 111 | offset = cnt; |
b69585d9 | 112 | environ[cnt + 1] = NULL; |
f5238bee | 113 | } |
b69585d9 | 114 | for (C = (char *)name; *C && *C != '='; ++C) |
115 | ; /* no `=' in name */ | |
f5238bee | 116 | if (!(environ[offset] = /* name + `=' + value */ |
117 | malloc((size_t)((int)(C - name) + l_value + 2)))) | |
118 | return (-1); | |
119 | for (C = environ[offset]; (*C = *name++) && *C != '='; ++C) | |
120 | ; | |
121 | for (*C++ = '='; (*C++ = *value++); ) | |
122 | ; | |
123 | return (0); | |
124 | } | |
351f44a0 | 125 | #endif /* HAVE_SETENV */ |
f5238bee | 126 | |
351f44a0 | 127 | #ifndef HAVE_UNSETENV |
f5238bee | 128 | /* |
129 | * unsetenv(name) -- | |
130 | * Delete environmental variable "name". | |
131 | */ | |
132 | void | |
b69585d9 | 133 | unsetenv(const char *name) |
f5238bee | 134 | { |
b69585d9 | 135 | char **P; |
f5238bee | 136 | int offset; |
f5238bee | 137 | |
b69585d9 | 138 | while (__findenv(name, &offset)) /* if set multiple times */ |
f5238bee | 139 | for (P = &environ[offset];; ++P) |
140 | if (!(*P = *(P + 1))) | |
141 | break; | |
142 | } | |
351f44a0 | 143 | #endif /* HAVE_UNSETENV */ |
f5238bee | 144 | |
351f44a0 | 145 | #endif /* !defined(HAVE_SETENV) || !defined(HAVE_UNSETENV) */ |