compat/setenv.c

   1 /*****************************************************************************
   2  * setenv.c: POSIX setenv() & unsetenv() replacement
   3  *****************************************************************************
   4  * Copyright © 2010 Rémi Denis-Courmont
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 int setenv (const char *name, const char *value, int override)
  29 {
  30 #ifdef HAVE_GETENV
  31     if (override == 0 && getenv (name) != NULL)
  32         return 0;
  33
  34     size_t namelen = strlen (name);
  35     size_t valuelen = strlen (value);
  36     char *var = malloc (namelen + valuelen + 2);
  37
  38     if (var == NULL)
  39         return -1;
  40
  41     sprintf (var, "%s=%s", name, value);
  42     /* This leaks memory. This is unavoidable. */
  43     return putenv (var);
  44 #else
  45     return -1;
  46 #endif
  47 }
  48
  49 int unsetenv (const char *name)
  50 {
  51     return setenv (name, "", 1);
  52 }