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1 /* Utility to update paths from internal to external forms.
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2 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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3 2007 Free Software Foundation, Inc.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU Library General Public License as published by
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9 the Free Software Foundation; either version 3 of the License, or (at
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10 your option) any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 Library General Public License for more details.
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16
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17 You should have received a copy of the GNU Library General Public
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18 License along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 /* This file contains routines to update a path, both to canonicalize
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22 the directory format and to handle any prefix translation.
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23
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24 This file must be compiled with -DPREFIX= to specify the "prefix"
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25 value used by configure. If a filename does not begin with this
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26 prefix, it will not be affected other than by directory canonicalization.
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27
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28 Each caller of 'update_path' may specify both a filename and
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29 a translation prefix and consist of the name of the package that contains
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30 the file ("@GCC", "@BINUTIL", "@GNU", etc).
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31
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32 If the prefix is not specified, the filename will only undergo
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33 directory canonicalization.
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34
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35 If it is specified, the string given by PREFIX will be replaced
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36 by the specified prefix (with a '@' in front unless the prefix begins
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37 with a '$') and further translation will be done as follows
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38 until none of the two conditions below are met:
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39
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40 1) If the filename begins with '@', the string between the '@' and
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41 the end of the name or the first '/' or directory separator will
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42 be considered a "key" and looked up as follows:
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43
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44 -- If this is a Win32 OS, then the Registry will be examined for
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45 an entry of "key" in
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46
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47 HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\<KEY>
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48
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49 if found, that value will be used. <KEY> defaults to GCC version
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50 string, but can be overridden at configuration time.
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51
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52 -- If not found (or not a Win32 OS), the environment variable
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53 key_ROOT (the value of "key" concatenated with the constant "_ROOT")
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54 is tried. If that fails, then PREFIX (see above) is used.
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55
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56 2) If the filename begins with a '$', the rest of the string up
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57 to the end or the first '/' or directory separator will be used
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58 as an environment variable, whose value will be returned.
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59
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60 Once all this is done, any '/' will be converted to DIR_SEPARATOR,
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61 if they are different.
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62
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63 NOTE: using resolve_keyed_path under Win32 requires linking with
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64 advapi32.dll. */
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65
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66
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67 #include "config.h"
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68 #include "system.h"
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69 #include "coretypes.h"
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70 #include "tm.h"
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71 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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72 #include <windows.h>
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73 #endif
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74 #include "prefix.h"
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75
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76 static const char *std_prefix = PREFIX;
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77
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78 static const char *get_key_value (char *);
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79 static char *translate_name (char *);
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80 static char *save_string (const char *, int);
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81 static void tr (char *, int, int);
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82
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83 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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84 static char *lookup_key (char *);
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85 static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
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86 #endif
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87
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88 /* Given KEY, as above, return its value. */
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89
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90 static const char *
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91 get_key_value (char *key)
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92 {
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93 const char *prefix = 0;
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94 char *temp = 0;
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95
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96 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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97 prefix = lookup_key (key);
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98 #endif
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99
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100 if (prefix == 0)
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101 prefix = getenv (temp = concat (key, "_ROOT", NULL));
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102
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103 if (prefix == 0)
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104 prefix = std_prefix;
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105
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106 if (temp)
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107 free (temp);
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108
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109 return prefix;
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110 }
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111
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112 /* Return a copy of a string that has been placed in the heap. */
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113
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114 static char *
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115 save_string (const char *s, int len)
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116 {
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117 char *result = XNEWVEC (char, len + 1);
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118
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119 memcpy (result, s, len);
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120 result[len] = 0;
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121 return result;
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122 }
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123
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124 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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125
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126 #ifndef WIN32_REGISTRY_KEY
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127 # define WIN32_REGISTRY_KEY BASEVER
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128 #endif
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129
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130 /* Look up "key" in the registry, as above. */
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131
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132 static char *
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133 lookup_key (char *key)
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134 {
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135 char *dst;
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136 DWORD size;
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137 DWORD type;
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138 LONG res;
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139
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140 if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
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141 {
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142 res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
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143 KEY_READ, ®_key);
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144
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145 if (res == ERROR_SUCCESS)
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146 res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
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147 KEY_READ, ®_key);
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148
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149 if (res == ERROR_SUCCESS)
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150 res = RegOpenKeyExA (reg_key, WIN32_REGISTRY_KEY, 0,
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151 KEY_READ, ®_key);
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152
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153 if (res != ERROR_SUCCESS)
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154 {
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155 reg_key = (HKEY) INVALID_HANDLE_VALUE;
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156 return 0;
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157 }
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158 }
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159
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160 size = 32;
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161 dst = xmalloc (size);
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162
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163 res = RegQueryValueExA (reg_key, key, 0, &type, (LPBYTE) dst, &size);
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164 if (res == ERROR_MORE_DATA && type == REG_SZ)
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165 {
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166 dst = xrealloc (dst, size);
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167 res = RegQueryValueExA (reg_key, key, 0, &type, (LPBYTE) dst, &size);
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168 }
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169
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170 if (type != REG_SZ || res != ERROR_SUCCESS)
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171 {
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172 free (dst);
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173 dst = 0;
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174 }
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175
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176 return dst;
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177 }
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178 #endif
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179
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180 /* If NAME, a malloc-ed string, starts with a '@' or '$', apply the
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181 translation rules above and return a newly malloc-ed name.
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182 Otherwise, return the given name. */
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183
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184 static char *
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185 translate_name (char *name)
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186 {
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187 char code;
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188 char *key, *old_name;
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189 const char *prefix;
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190 int keylen;
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191
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192 for (;;)
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193 {
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194 code = name[0];
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195 if (code != '@' && code != '$')
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196 break;
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197
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198 for (keylen = 0;
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199 (name[keylen + 1] != 0 && !IS_DIR_SEPARATOR (name[keylen + 1]));
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200 keylen++)
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201 ;
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202
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203 key = (char *) alloca (keylen + 1);
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204 strncpy (key, &name[1], keylen);
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205 key[keylen] = 0;
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206
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207 if (code == '@')
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208 {
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209 prefix = get_key_value (key);
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210 if (prefix == 0)
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211 prefix = std_prefix;
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212 }
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213 else
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214 prefix = getenv (key);
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215
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216 if (prefix == 0)
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217 prefix = PREFIX;
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218
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219 /* We used to strip trailing DIR_SEPARATORs here, but that can
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220 sometimes yield a result with no separator when one was coded
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221 and intended by the user, causing two path components to run
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222 together. */
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223
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224 old_name = name;
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225 name = concat (prefix, &name[keylen + 1], NULL);
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226 free (old_name);
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227 }
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228
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229 return name;
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230 }
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231
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232 /* In a NUL-terminated STRING, replace character C1 with C2 in-place. */
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233 static void
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234 tr (char *string, int c1, int c2)
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235 {
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236 do
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237 {
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238 if (*string == c1)
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239 *string = c2;
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240 }
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241 while (*string++);
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242 }
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243
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244 /* Update PATH using KEY if PATH starts with PREFIX as a directory.
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245 The returned string is always malloc-ed, and the caller is
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246 responsible for freeing it. */
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247
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248 char *
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249 update_path (const char *path, const char *key)
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250 {
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251 char *result, *p;
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252 const int len = strlen (std_prefix);
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253
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254 if (! strncmp (path, std_prefix, len)
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255 && (IS_DIR_SEPARATOR(path[len])
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256 || path[len] == '\0')
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257 && key != 0)
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258 {
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259 bool free_key = false;
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260
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261 if (key[0] != '$')
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262 {
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263 key = concat ("@", key, NULL);
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264 free_key = true;
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265 }
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266
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267 result = concat (key, &path[len], NULL);
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268 if (free_key)
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269 free (CONST_CAST (char *, key));
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270 result = translate_name (result);
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271 }
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272 else
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273 result = xstrdup (path);
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274
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275 #ifndef ALWAYS_STRIP_DOTDOT
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276 #define ALWAYS_STRIP_DOTDOT 0
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277 #endif
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278
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279 p = result;
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280 while (1)
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281 {
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282 char *src, *dest;
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283
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284 p = strchr (p, '.');
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285 if (p == NULL)
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286 break;
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287 /* Look for `/../' */
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288 if (p[1] == '.'
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289 && IS_DIR_SEPARATOR (p[2])
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290 && (p != result && IS_DIR_SEPARATOR (p[-1])))
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291 {
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292 *p = 0;
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293 if (!ALWAYS_STRIP_DOTDOT && access (result, X_OK) == 0)
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294 {
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295 *p = '.';
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296 break;
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297 }
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298 else
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299 {
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300 /* We can't access the dir, so we won't be able to
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301 access dir/.. either. Strip out `dir/../'. If `dir'
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302 turns out to be `.', strip one more path component. */
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303 dest = p;
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304 do
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305 {
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306 --dest;
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307 while (dest != result && IS_DIR_SEPARATOR (*dest))
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308 --dest;
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309 while (dest != result && !IS_DIR_SEPARATOR (dest[-1]))
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310 --dest;
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311 }
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312 while (dest != result && *dest == '.');
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313 /* If we have something like `./..' or `/..', don't
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314 strip anything more. */
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315 if (*dest == '.' || IS_DIR_SEPARATOR (*dest))
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316 {
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317 *p = '.';
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318 break;
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319 }
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320 src = p + 3;
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321 while (IS_DIR_SEPARATOR (*src))
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322 ++src;
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323 p = dest;
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324 while ((*dest++ = *src++) != 0)
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325 ;
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326 }
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327 }
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328 else
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329 ++p;
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330 }
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331
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332 #ifdef UPDATE_PATH_HOST_CANONICALIZE
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333 /* Perform host dependent canonicalization when needed. */
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334 UPDATE_PATH_HOST_CANONICALIZE (result);
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335 #endif
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336
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337 #ifdef DIR_SEPARATOR_2
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338 /* Convert DIR_SEPARATOR_2 to DIR_SEPARATOR. */
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339 if (DIR_SEPARATOR_2 != DIR_SEPARATOR)
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340 tr (result, DIR_SEPARATOR_2, DIR_SEPARATOR);
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341 #endif
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342
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343 #if defined (DIR_SEPARATOR) && !defined (DIR_SEPARATOR_2)
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344 if (DIR_SEPARATOR != '/')
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345 tr (result, '/', DIR_SEPARATOR);
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346 #endif
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347
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348 return result;
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349 }
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350
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351 /* Reset the standard prefix. */
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352 void
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353 set_std_prefix (const char *prefix, int len)
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354 {
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355 std_prefix = save_string (prefix, len);
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356 }
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