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5191 | serge | 1 | /* Copyright (C) 1992, 1995, 1996, 1997, 2002, 2011 Free Software Foundation, |
2 | Inc. |
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3 | This file based on setenv.c in the GNU C Library. |
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4 | |||
5 | The GNU C Library is free software; you can redistribute it and/or |
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6 | modify it under the terms of the GNU Library General Public License as |
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7 | published by the Free Software Foundation; either version 2 of the |
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8 | License, or (at your option) any later version. |
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9 | |||
10 | The GNU C Library is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 | Library General Public License for more details. |
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14 | |||
15 | You should have received a copy of the GNU Library General Public |
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16 | License along with the GNU C Library; see the file COPYING.LIB. If not, |
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17 | write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
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18 | Boston, MA 02110-1301, USA. */ |
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19 | |||
20 | |||
21 | /* |
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22 | |||
23 | @deftypefn Supplemental int setenv (const char *@var{name}, @ |
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24 | const char *@var{value}, int @var{overwrite}) |
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25 | @deftypefnx Supplemental void unsetenv (const char *@var{name}) |
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26 | |||
27 | @code{setenv} adds @var{name} to the environment with value |
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28 | @var{value}. If the name was already present in the environment, |
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29 | the new value will be stored only if @var{overwrite} is nonzero. |
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30 | The companion @code{unsetenv} function removes @var{name} from the |
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31 | environment. This implementation is not safe for multithreaded code. |
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32 | |||
33 | @end deftypefn |
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34 | |||
35 | */ |
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36 | |||
37 | #if HAVE_CONFIG_H |
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38 | # include |
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39 | #endif |
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40 | |||
41 | #define setenv libiberty_setenv |
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42 | #define unsetenv libiberty_unsetenv |
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43 | |||
44 | #include "ansidecl.h" |
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45 | #include |
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46 | #include |
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47 | |||
48 | #include |
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49 | #if !defined(errno) && !defined(HAVE_ERRNO_DECL) |
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50 | extern int errno; |
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51 | #endif |
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52 | #define __set_errno(ev) ((errno) = (ev)) |
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53 | |||
54 | #if HAVE_STDLIB_H |
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55 | # include |
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56 | #endif |
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57 | #if HAVE_STRING_H |
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58 | # include |
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59 | #endif |
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60 | #if HAVE_UNISTD_H |
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61 | # include |
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62 | #endif |
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63 | |||
64 | #define __environ environ |
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65 | #ifndef HAVE_ENVIRON_DECL |
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66 | extern char **environ; |
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67 | #endif |
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68 | |||
69 | #undef setenv |
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70 | #undef unsetenv |
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71 | |||
72 | /* LOCK and UNLOCK are defined as no-ops. This makes the libiberty |
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73 | * implementation MT-Unsafe. */ |
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74 | #define LOCK |
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75 | #define UNLOCK |
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76 | |||
77 | /* Below this point, it's verbatim code from the glibc-2.0 implementation */ |
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78 | |||
79 | /* If this variable is not a null pointer we allocated the current |
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80 | environment. */ |
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81 | static char **last_environ; |
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82 | |||
83 | |||
84 | int |
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85 | setenv (const char *name, const char *value, int replace) |
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86 | { |
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87 | register char **ep = 0; |
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88 | register size_t size; |
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89 | const size_t namelen = strlen (name); |
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90 | const size_t vallen = strlen (value) + 1; |
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91 | |||
92 | LOCK; |
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93 | |||
94 | size = 0; |
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95 | if (__environ != NULL) |
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96 | { |
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97 | for (ep = __environ; *ep != NULL; ++ep) |
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98 | if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=') |
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99 | break; |
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100 | else |
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101 | ++size; |
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102 | } |
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103 | |||
104 | if (__environ == NULL || *ep == NULL) |
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105 | { |
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106 | char **new_environ; |
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107 | if (__environ == last_environ && __environ != NULL) |
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108 | /* We allocated this space; we can extend it. */ |
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109 | new_environ = (char **) realloc (last_environ, |
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110 | (size + 2) * sizeof (char *)); |
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111 | else |
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112 | new_environ = (char **) malloc ((size + 2) * sizeof (char *)); |
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113 | |||
114 | if (new_environ == NULL) |
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115 | { |
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116 | UNLOCK; |
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117 | return -1; |
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118 | } |
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119 | |||
120 | new_environ[size] = (char *) malloc (namelen + 1 + vallen); |
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121 | if (new_environ[size] == NULL) |
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122 | { |
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123 | free ((char *) new_environ); |
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124 | __set_errno (ENOMEM); |
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125 | UNLOCK; |
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126 | return -1; |
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127 | } |
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128 | |||
129 | if (__environ != last_environ) |
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130 | memcpy ((char *) new_environ, (char *) __environ, |
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131 | size * sizeof (char *)); |
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132 | |||
133 | memcpy (new_environ[size], name, namelen); |
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134 | new_environ[size][namelen] = '='; |
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135 | memcpy (&new_environ[size][namelen + 1], value, vallen); |
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136 | |||
137 | new_environ[size + 1] = NULL; |
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138 | |||
139 | last_environ = __environ = new_environ; |
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140 | } |
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141 | else if (replace) |
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142 | { |
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143 | size_t len = strlen (*ep); |
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144 | if (len + 1 < namelen + 1 + vallen) |
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145 | { |
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146 | /* The existing string is too short; malloc a new one. */ |
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147 | char *new_string = (char *) malloc (namelen + 1 + vallen); |
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148 | if (new_string == NULL) |
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149 | { |
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150 | UNLOCK; |
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151 | return -1; |
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152 | } |
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153 | *ep = new_string; |
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154 | } |
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155 | memcpy (*ep, name, namelen); |
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156 | (*ep)[namelen] = '='; |
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157 | memcpy (&(*ep)[namelen + 1], value, vallen); |
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158 | } |
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159 | |||
160 | UNLOCK; |
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161 | |||
162 | return 0; |
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163 | } |
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164 | |||
165 | void |
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166 | unsetenv (const char *name) |
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167 | { |
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168 | const size_t len = strlen (name); |
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169 | char **ep; |
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170 | |||
171 | LOCK; |
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172 | |||
173 | for (ep = __environ; *ep; ++ep) |
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174 | if (!strncmp (*ep, name, len) && (*ep)[len] == '=') |
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175 | { |
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176 | /* Found it. Remove this pointer by moving later ones back. */ |
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177 | char **dp = ep; |
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178 | do |
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179 | dp[0] = dp[1]; |
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180 | while (*dp++); |
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181 | /* Continue the loop in case NAME appears again. */ |
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182 | } |
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183 | |||
184 | UNLOCK; |
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185 | }> |