libcompat/unsetenv.c

   1 /*
   2  * libcompat - system compatibility library
   3  *
   4  * Copyright © 1995 Ian Jackson <ian@chiark.greenend.org.uk>
   5  *
   6  * This is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2,
   9  * or (at your option) any later version.
  10  *
  11  * This is distributed in the hope that it will be useful, but
  12  * 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
  17  * License along with dpkg; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <config.h>
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #ifndef HAVE_UNSETENV
  27 int
  28 unsetenv(const char *p)
  29 {
  30         char *q;
  31
  32         q = malloc(strlen(p) + 3);
  33         if (!q)
  34                 return -1;
  35
  36         strcpy(q, p);
  37         strcat(q, "=");
  38         return putenv(q);
  39 }
  40 #endif
  41