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1 /* Copyright (C) 1992, 1995, 1996, 1997, 2002 Free Software Foundation, Inc.
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2 This file based on setenv.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
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22 @deftypefn Supplemental int setenv (const char *@var{name}, const char *@var{value}, int @var{overwrite})
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23 @deftypefnx Supplemental void unsetenv (const char *@var{name})
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24
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25 @code{setenv} adds @var{name} to the environment with value
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26 @var{value}. If the name was already present in the environment,
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27 the new value will be stored only if @var{overwrite} is nonzero.
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28 The companion @code{unsetenv} function removes @var{name} from the
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29 environment. This implementation is not safe for multithreaded code.
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30
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31 @end deftypefn
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32
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33 */
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34
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35 #if HAVE_CONFIG_H
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36 # include <config.h>
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37 #endif
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38
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39 #define setenv libiberty_setenv
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40 #define unsetenv libiberty_unsetenv
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41
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42 #include "ansidecl.h"
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43 #include <sys/types.h> /* For `size_t' */
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44 #include <stdio.h> /* For `NULL' */
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45
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46 #include <errno.h>
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47 #if !defined(errno) && !defined(HAVE_ERRNO_DECL)
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48 extern int errno;
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49 #endif
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50 #define __set_errno(ev) ((errno) = (ev))
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51
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52 #if HAVE_STDLIB_H
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53 # include <stdlib.h>
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54 #endif
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55 #if HAVE_STRING_H
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56 # include <string.h>
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57 #endif
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58 #if HAVE_UNISTD_H
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59 # include <unistd.h>
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60 #endif
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61
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62 #define __environ environ
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63 #ifndef HAVE_ENVIRON_DECL
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64 extern char **environ;
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65 #endif
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66
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67 #undef setenv
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68 #undef unsetenv
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69
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70 /* LOCK and UNLOCK are defined as no-ops. This makes the libiberty
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71 * implementation MT-Unsafe. */
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72 #define LOCK
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73 #define UNLOCK
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74
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75 /* Below this point, it's verbatim code from the glibc-2.0 implementation */
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76
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77 /* If this variable is not a null pointer we allocated the current
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78 environment. */
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79 static char **last_environ;
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80
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81
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82 int
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83 setenv (const char *name, const char *value, int replace)
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84 {
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85 register char **ep = 0;
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86 register size_t size;
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87 const size_t namelen = strlen (name);
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88 const size_t vallen = strlen (value) + 1;
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89
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90 LOCK;
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91
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92 size = 0;
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93 if (__environ != NULL)
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94 {
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95 for (ep = __environ; *ep != NULL; ++ep)
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96 if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
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97 break;
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98 else
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99 ++size;
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100 }
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101
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102 if (__environ == NULL || *ep == NULL)
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103 {
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104 char **new_environ;
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105 if (__environ == last_environ && __environ != NULL)
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106 /* We allocated this space; we can extend it. */
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107 new_environ = (char **) realloc (last_environ,
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108 (size + 2) * sizeof (char *));
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109 else
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110 new_environ = (char **) malloc ((size + 2) * sizeof (char *));
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111
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112 if (new_environ == NULL)
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113 {
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114 UNLOCK;
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115 return -1;
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116 }
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117
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118 new_environ[size] = (char *) malloc (namelen + 1 + vallen);
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119 if (new_environ[size] == NULL)
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120 {
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121 free ((char *) new_environ);
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122 __set_errno (ENOMEM);
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123 UNLOCK;
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124 return -1;
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125 }
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126
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127 if (__environ != last_environ)
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128 memcpy ((char *) new_environ, (char *) __environ,
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129 size * sizeof (char *));
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130
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131 memcpy (new_environ[size], name, namelen);
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132 new_environ[size][namelen] = '=';
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133 memcpy (&new_environ[size][namelen + 1], value, vallen);
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134
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135 new_environ[size + 1] = NULL;
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136
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137 last_environ = __environ = new_environ;
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138 }
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139 else if (replace)
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140 {
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141 size_t len = strlen (*ep);
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142 if (len + 1 < namelen + 1 + vallen)
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143 {
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144 /* The existing string is too short; malloc a new one. */
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145 char *new_string = (char *) malloc (namelen + 1 + vallen);
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146 if (new_string == NULL)
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147 {
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148 UNLOCK;
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149 return -1;
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150 }
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151 *ep = new_string;
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152 }
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153 memcpy (*ep, name, namelen);
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154 (*ep)[namelen] = '=';
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155 memcpy (&(*ep)[namelen + 1], value, vallen);
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156 }
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157
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158 UNLOCK;
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159
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160 return 0;
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161 }
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162
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163 void
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164 unsetenv (const char *name)
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165 {
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166 const size_t len = strlen (name);
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167 char **ep;
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168
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169 LOCK;
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170
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171 for (ep = __environ; *ep; ++ep)
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172 if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
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173 {
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174 /* Found it. Remove this pointer by moving later ones back. */
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175 char **dp = ep;
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176 do
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177 dp[0] = dp[1];
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178 while (*dp++);
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179 /* Continue the loop in case NAME appears again. */
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180 }
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181
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182 UNLOCK;
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183 }
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