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1 /* Copyright (C) 1991-2020 Free Software Foundation, Inc.
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2 This file based on putenv.c in the GNU C Library.
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3
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4 The GNU C Library is free software; you can redistribute it and/or
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5 modify it under the terms of the GNU Library General Public License as
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6 published by the Free Software Foundation; either version 2 of the
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7 License, or (at your option) any later version.
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8
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9 The GNU C Library is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 Library General Public License for more details.
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13
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14 You should have received a copy of the GNU Library General Public
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15 License along with the GNU C Library; see the file COPYING.LIB. If not,
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16 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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17 Boston, MA 02110-1301, USA. */
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18
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19 /*
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20
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21 @deftypefn Supplemental int putenv (const char *@var{string})
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22
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23 Uses @code{setenv} or @code{unsetenv} to put @var{string} into
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24 the environment or remove it. If @var{string} is of the form
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25 @samp{name=value} the string is added; if no @samp{=} is present the
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26 name is unset/removed.
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27
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28 @end deftypefn
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29
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30 */
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31
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32 #if defined (_AIX) && !defined (__GNUC__)
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33 #pragma alloca
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34 #endif
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35
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36 #if HAVE_CONFIG_H
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37 # include <config.h>
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38 #endif
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39
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40 #include "ansidecl.h"
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41
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42 #define putenv libiberty_putenv
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43
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44 #if HAVE_STDLIB_H
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45 # include <stdlib.h>
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46 #endif
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47 #if HAVE_STRING_H
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48 # include <string.h>
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49 #endif
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50
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51 #ifdef HAVE_ALLOCA_H
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52 # include <alloca.h>
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53 #else
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54 # ifndef alloca
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55 # ifdef __GNUC__
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56 # define alloca __builtin_alloca
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57 # else
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58 extern char *alloca ();
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59 # endif /* __GNUC__ */
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60 # endif /* alloca */
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61 #endif /* HAVE_ALLOCA_H */
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62
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63 #undef putenv
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64
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65 /* Below this point, it's verbatim code from the glibc-2.0 implementation */
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66
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67
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68 /* Put STRING, which is of the form "NAME=VALUE", in the environment. */
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69 int
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70 putenv (const char *string)
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71 {
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72 const char *const name_end = strchr (string, '=');
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73
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74 if (name_end)
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75 {
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76 char *name = (char *) alloca (name_end - string + 1);
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77 memcpy (name, string, name_end - string);
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78 name[name_end - string] = '\0';
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79 return setenv (name, name_end + 1, 1);
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80 }
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81
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82 unsetenv (string);
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83 return 0;
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84 }
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