mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-28 05:51:04 +00:00
55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
/* go-unsetenv.c -- unset an environment variable from Go.
|
|
|
|
Copyright 2015 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"
|
|
|
|
/* Unset an environment variable from Go. This is called by
|
|
syscall.Unsetenv. */
|
|
|
|
void unsetenv_c (String) __asm__ (GOSYM_PREFIX "syscall.unsetenv_c");
|
|
|
|
void
|
|
unsetenv_c (String k)
|
|
{
|
|
const byte *ks;
|
|
unsigned char *kn;
|
|
intgo len;
|
|
|
|
ks = k.str;
|
|
if (ks == NULL)
|
|
ks = (const byte *) "";
|
|
kn = NULL;
|
|
|
|
#ifdef HAVE_UNSETENV
|
|
|
|
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;
|
|
}
|
|
|
|
unsetenv ((const char *) ks);
|
|
|
|
#endif /* !defined(HAVE_UNSETENV) */
|
|
|
|
if (kn != NULL)
|
|
__go_free (kn);
|
|
}
|