lib/roken/setenv.c

   1 /*
   2  * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35
  36 #include "roken.h"
  37
  38 #include <stdlib.h>
  39 #include <string.h>
  40
  41 /*
  42  * This is the easy way out, use putenv to implement setenv. We might
  43  * leak some memory but that is ok since we are usally about to exec
  44  * anyway.
  45  */
  46
  47 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
  48 setenv(const char *var, const char *val, int rewrite)
  49 {
  50 #ifndef _WIN32
  51     char *t = NULL;
  52
  53     if (!rewrite && getenv(var) != 0)
  54         return 0;
  55
  56     if (asprintf (&t, "%s=%s", var, val) < 0 || t == NULL)
  57         return -1;
  58
  59     if (putenv(t) == 0)
  60         return 0;
  61     else
  62         return -1;
  63 #else  /* Win32 */
  64     char dummy[8];
  65
  66     if (!rewrite && GetEnvironmentVariable(var, dummy, sizeof(dummy)/sizeof(char)) != 0)
  67         return 0;
  68
  69     if (SetEnvironmentVariable(var, val) == 0)
  70         return -1;
  71     else
  72         return 0;
  73 #endif
  74 }