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 */
40 extern char **environ; /* global environment */
47 unsetenv(const char *var)
52 if (var == NULL || *var == '\0' || strchr(var, '=') != NULL) {
63 if (strncmp(var, *ep, len) == 0 && (*ep)[len] == '=') {
64 /* Found it; shift remainder + NULL over by one. */
66 while ((*cur = *(cur + 1)) != NULL)
68 /* Keep going, could be multiple instances of the var. */