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1 /* go-unsetenv.c -- unset an environment variable from Go.
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2
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3 Copyright 2015 The Go Authors. All rights reserved.
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4 Use of this source code is governed by a BSD-style
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5 license that can be found in the LICENSE file. */
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6
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7 #include "config.h"
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8
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9 #include <stddef.h>
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10 #include <stdlib.h>
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11
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12 #include "runtime.h"
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13
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14 /* Unset an environment variable from Go. This is called by
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15 syscall.Unsetenv. */
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16
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17 void unsetenv_c (String) __asm__ (GOSYM_PREFIX "syscall.unsetenv_c");
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18
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19 void
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20 unsetenv_c (String k)
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21 {
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22 const byte *ks;
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23 unsigned char *kn;
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24
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25 ks = k.str;
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26 if (ks == NULL)
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27 ks = (const byte *) "";
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28 kn = NULL;
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29
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30 #ifdef HAVE_UNSETENV
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31
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32 if (ks[k.len] != 0)
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33 {
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34 kn = malloc (k.len + 1);
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35 if (kn == NULL)
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36 runtime_throw ("out of malloc memory");
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37 __builtin_memcpy (kn, ks, k.len);
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38 ks = kn;
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39 }
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40
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41 unsetenv ((const char *) ks);
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42
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43 #endif /* !defined(HAVE_UNSETENV) */
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44
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45 if (kn != NULL)
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46 free (kn);
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47 }
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