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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 "runtime.h"
#include "arch.h"
#include "malloc.h"
/* Set the C environment from Go. This is called by syscall.Setenv. */
void setenv_c (String, String) __asm__ (GOSYM_PREFIX "syscall.setenv_c");
void
setenv_c (String k, String v)
{
const byte *ks;
unsigned char *kn;
const byte *vs;
unsigned char *vn;
intgo len;
ks = k.str;
if (ks == NULL)
ks = (const byte *) "";
kn = NULL;
vs = v.str;
if (vs == NULL)
vs = (const byte *) "";
vn = NULL;
#ifdef HAVE_SETENV
if (ks != NULL && ks[k.len] != 0)
{
// Objects that are explicitly freed must be at least 16 bytes in size,
// so that they are not allocated using tiny alloc.
len = k.len + 1;
if (len < TinySize)
len = TinySize;
kn = __go_alloc (len);
__builtin_memcpy (kn, ks, k.len);
ks = kn;
}
if (vs != NULL && vs[v.len] != 0)
{
len = v.len + 1;
if (len < TinySize)
len = TinySize;
vn = __go_alloc (len);
__builtin_memcpy (vn, vs, v.len);
vs = vn;
}
setenv ((const char *) ks, (const char *) vs, 1);
#else /* !defined(HAVE_SETENV) */
len = k.len + v.len + 2;
if (len < TinySize)
len = TinySize;
kn = __go_alloc (len);
__builtin_memcpy (kn, ks, k.len);
kn[k.len] = '=';
__builtin_memcpy (kn + k.len + 1, vs, v.len);
kn[k.len + v.len + 1] = '\0';
putenv ((char *) kn);
#endif /* !defined(HAVE_SETENV) */
if (kn != NULL)
__go_free (kn);
if (vn != NULL)
__go_free (vn);
}
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