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putenv.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <ast.h>

#if defined(__EXPORT__)
#define extern    __EXPORT__
#endif

extern int
putenv(const char* s)
{
      return setenviron(s) ? 0 : -1;
}

extern int
setenv(const char* name, const char* value, int overwrite)
{
      char* s;

      if (overwrite || !getenv(name))
      {
            if (!(s = sfprints("%s=%s", name, value)) || !(s = strdup(s)))
                  return -1;
            return setenviron(s) ? 0 : -1;
      }
      return 0;
}

extern void
unsetenv(const char *name)
{
      if (!strchr(name, '='))
            setenviron(name);
}

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