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f5238bee | 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 | #include "config.h" | |
35 | #ifndef HAVE_SETENV | |
36 | ||
37 | #if defined(LIBC_SCCS) && !defined(lint) | |
38 | static char *rcsid = "$OpenBSD: setenv.c,v 1.3 1998/02/02 22:44:53 millert Exp $"; | |
39 | #endif /* LIBC_SCCS and not lint */ | |
40 | ||
41 | #include <stdlib.h> | |
42 | #include <string.h> | |
43 | ||
44 | /* | |
45 | * __findenv -- | |
46 | * Returns pointer to value associated with name, if any, else NULL. | |
47 | * Sets offset to be the offset of the name/value combination in the | |
48 | * environmental array, for use by setenv(3) and unsetenv(3). | |
49 | * Explicitly removes '=' in argument name. | |
50 | * | |
51 | * This routine *should* be a static; don't use it. | |
52 | */ | |
53 | char * | |
54 | __findenv(name, offset) | |
55 | register const char *name; | |
56 | int *offset; | |
57 | { | |
58 | extern char **environ; | |
59 | register int len, i; | |
60 | register const char *np; | |
61 | register char **p, *cp; | |
62 | ||
63 | if (name == NULL || environ == NULL) | |
64 | return (NULL); | |
65 | for (np = name; *np && *np != '='; ++np) | |
66 | ; | |
67 | len = np - name; | |
68 | for (p = environ; (cp = *p) != NULL; ++p) { | |
69 | for (np = name, i = len; i && *cp; i--) | |
70 | if (*cp++ != *np++) | |
71 | break; | |
72 | if (i == 0 && *cp++ == '=') { | |
73 | *offset = p - environ; | |
74 | return (cp); | |
75 | } | |
76 | } | |
77 | return (NULL); | |
78 | } | |
79 | ||
80 | /* | |
81 | * setenv -- | |
82 | * Set the value of the environmental variable "name" to be | |
83 | * "value". If rewrite is set, replace any current value. | |
84 | */ | |
85 | int | |
86 | setenv(name, value, rewrite) | |
87 | register const char *name; | |
88 | register const char *value; | |
89 | int rewrite; | |
90 | { | |
91 | extern char **environ; | |
92 | static int alloced; /* if allocated space before */ | |
93 | register char *C; | |
94 | int l_value, offset; | |
95 | char *__findenv(); | |
96 | ||
97 | if (*value == '=') /* no `=' in value */ | |
98 | ++value; | |
99 | l_value = strlen(value); | |
100 | if ((C = __findenv(name, &offset))) { /* find if already exists */ | |
101 | if (!rewrite) | |
102 | return (0); | |
103 | if (strlen(C) >= l_value) { /* old larger; copy over */ | |
104 | while ((*C++ = *value++)); | |
105 | return (0); | |
106 | } | |
107 | } else { /* create new slot */ | |
108 | register int cnt; | |
109 | register char **P; | |
110 | ||
111 | for (P = environ, cnt = 0; *P; ++P, ++cnt); | |
112 | if (alloced) { /* just increase size */ | |
113 | P = (char **)realloc((void *)environ, | |
114 | (size_t)(sizeof(char *) * (cnt + 2))); | |
115 | if (!P) | |
116 | return (-1); | |
117 | environ = P; | |
118 | } | |
119 | else { /* get new space */ | |
120 | alloced = 1; /* copy old entries into it */ | |
121 | P = (char **)malloc((size_t)(sizeof(char *) * | |
122 | (cnt + 2))); | |
123 | if (!P) | |
124 | return (-1); | |
5a64a938 | 125 | memmove(environ, P, cnt * sizeof(char *)); |
f5238bee | 126 | environ = P; |
127 | } | |
128 | environ[cnt + 1] = NULL; | |
129 | offset = cnt; | |
130 | } | |
131 | for (C = (char *)name; *C && *C != '='; ++C); /* no `=' in name */ | |
132 | if (!(environ[offset] = /* name + `=' + value */ | |
133 | malloc((size_t)((int)(C - name) + l_value + 2)))) | |
134 | return (-1); | |
135 | for (C = environ[offset]; (*C = *name++) && *C != '='; ++C) | |
136 | ; | |
137 | for (*C++ = '='; (*C++ = *value++); ) | |
138 | ; | |
139 | return (0); | |
140 | } | |
141 | ||
142 | /* | |
143 | * unsetenv(name) -- | |
144 | * Delete environmental variable "name". | |
145 | */ | |
146 | void | |
147 | unsetenv(name) | |
148 | const char *name; | |
149 | { | |
150 | extern char **environ; | |
151 | register char **P; | |
152 | int offset; | |
153 | char *__findenv(); | |
154 | ||
155 | while (__findenv(name, &offset)) /* if set multiple times */ | |
156 | for (P = &environ[offset];; ++P) | |
157 | if (!(*P = *(P + 1))) | |
158 | break; | |
159 | } | |
160 | ||
161 | #endif /* HAVE_SETENV */ |