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/* go-setenv.c -- set the C environment from Go.

   Copyright 2011 The Go Authors. All rights reserved.

   Use of this source code is governed by a BSD-style

   license that can be found in the LICENSE file.  */

#include "config.h"

#include <stddef.h>

#include <stdlib.h>

#include "go-alloc.h"

#include "go-string.h"

/* Set the C environment from Go.  This is called by syscall.Setenv.  */

void setenv_c (struct __go_string, struct __go_string)

  __asm__ ("libgo_syscall.syscall.setenv_c");

void

setenv_c (struct __go_string k, struct __go_string v)

{

  const unsigned char *ks;

  unsigned char *kn;

  const unsigned char *vs;

  unsigned char *vn;

  ks = k.__data;

  kn = NULL;

  vs = v.__data;

  vn = NULL;

#ifdef HAVE_SETENV

  if (ks[k.__length] != 0)

    {

      kn = __go_alloc (k.__length + 1);

      __builtin_memcpy (kn, ks, k.__length);

      ks = kn;

    }

  if (vs[v.__length] != 0)

    {

      vn = __go_alloc (v.__length + 1);

      __builtin_memcpy (vn, vs, v.__length);

      vs = vn;

    }

  setenv ((const char *) ks, (const char *) vs, 1);

#else /* !defined(HAVE_SETENV) */

  kn = malloc (k.__length + v.__length + 2);

  __builtin_memcpy (kn, ks, k.__length);

  kn[k.__length] = '=';

  __builtin_memcpy (kn + k.__length + 1, vs, v.__length);

  kn[k.__length + v.__length + 1] = '\0';

  putenv ((char *) kn);

#endif /* !defined(HAVE_SETENV) */

  if (kn != NULL)

    __go_free (kn);

  if (vn != NULL)

    __go_free (vn);

}