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55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
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/* go-unsetenv.c -- unset an environment variable from Go.
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Copyright 2015 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include "config.h"
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#include <stddef.h>
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#include <stdlib.h>
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#include "go-alloc.h"
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#include "runtime.h"
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#include "arch.h"
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#include "malloc.h"
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/* Unset an environment variable from Go. This is called by
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syscall.Unsetenv. */
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void unsetenv_c (String) __asm__ (GOSYM_PREFIX "syscall.unsetenv_c");
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void
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unsetenv_c (String k)
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{
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const byte *ks;
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unsigned char *kn;
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intgo len;
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ks = k.str;
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if (ks == NULL)
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ks = (const byte *) "";
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kn = NULL;
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#ifdef HAVE_UNSETENV
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if (ks != NULL && ks[k.len] != 0)
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{
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// Objects that are explicitly freed must be at least 16 bytes in size,
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// so that they are not allocated using tiny alloc.
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len = k.len + 1;
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if (len < TinySize)
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len = TinySize;
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kn = __go_alloc (len);
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__builtin_memcpy (kn, ks, k.len);
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ks = kn;
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}
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unsetenv ((const char *) ks);
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#endif /* !defined(HAVE_UNSETENV) */
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if (kn != NULL)
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__go_free (kn);
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}
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