compat/setenv.c

   1 /*
   2  * Copyright (c) 2010 Dagobert Michelsen
   3  * Copyright (c) 2010 Nicholas Marriott <nicholas.marriott@gmail.com>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  14  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  15  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <sys/types.h>
  19
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #include "compat.h"
  24
  25 int
  26 setenv(const char *name, const char *value, __unused int overwrite)
  27 {
  28         char    *newval;
  29
  30         xasprintf(&newval, "%s=%s", name, value);
  31         return (putenv(newval));
  32 }
  33
  34 int
  35 unsetenv(const char *name)
  36 {
  37         char  **envptr;
  38         int     namelen;
  39
  40         namelen = strlen(name);
  41         for (envptr = environ; *envptr != NULL; envptr++) {
  42                 if (strncmp(name, *envptr, namelen) == 0 &&
  43                     ((*envptr)[namelen] == '=' || (*envptr)[namelen] == '\0'))
  44                         break;
  45         }
  46         for (; *envptr != NULL; envptr++)
  47                 *envptr = *(envptr + 1);
  48         return (0);
  49 }