48 lines
922 B
C
48 lines
922 B
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 "runtime.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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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[k.len] != 0)
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{
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kn = malloc (k.len + 1);
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if (kn == NULL)
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runtime_throw ("out of malloc memory");
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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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free (kn);
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}
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