2 * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <sys/types.h>
29 #endif /* STDC_HEADERS */
32 #endif /* HAVE_STRING_H */
35 #endif /* HAVE_STRINGS_H */
36 #if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
38 #endif /* HAVE_MALLOC_H && !STDC_HEADERS */
44 setenv(const char *var, const char *val, int overwrite)
50 if (!var || *var == '\0') {
56 * POSIX says a var name with '=' is an error but BSD
57 * just ignores the '=' and anything after it.
59 for (src = var; *src != '\0' && *src != '='; src++)
61 esize = (size_t)(src - var) + 2;
63 esize += strlen(val); /* glibc treats a NULL val as "" */
66 /* Allocate and fill in envstr. */
67 if ((envstr = malloc(esize)) == NULL)
69 for (src = var, dst = envstr; *src != '\0' && *src != '=';)
73 for (src = val; *src != '\0';)
78 if (!overwrite && getenv(var) != NULL) {
82 return putenv(envstr);