contrib/tcp_wrappers/setenv.c

   1  /*
   2   * Some systems do not have setenv(). This one is modeled after 4.4 BSD, but
   3   * is implemented in terms of portable primitives only: getenv(), putenv()
   4   * and malloc(). It should therefore be safe to use on every UNIX system.
   5   *
   6   * If clobber == 0, do not overwrite an existing variable.
   7   *
   8   * Returns nonzero if memory allocation fails.
   9   *
  10   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  11   */
  12
  13 #ifndef lint
  14 static char sccsid[] = "@(#) setenv.c 1.1 93/03/07 22:47:58";
  15 #endif
  16
  17 /* setenv - update or insert environment (name,value) pair */
  18
  19 int     setenv(name, value, clobber)
  20 char   *name;
  21 char   *value;
  22 int     clobber;
  23 {
  24     char   *malloc();
  25     char   *getenv();
  26     char   *cp;
  27
  28     if (clobber == 0 && getenv(name) != 0)
  29         return (0);
  30     if ((cp = malloc(strlen(name) + strlen(value) + 2)) == 0)
  31         return (1);
  32     sprintf(cp, "%s=%s", name, value);
  33     return (putenv(cp));
  34 }