1 | /* Utility to update paths from internal to external forms. |
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2 | Copyright (C) 1997, 1998 Free Software Foundation, Inc. |
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3 | |
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4 | This file is part of GNU CC. |
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5 | |
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6 | GNU CC is free software; you can redistribute it and/or |
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7 | modify it under the terms of the GNU Library General Public |
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8 | License as published by the Free Software Foundation; either |
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9 | version 2 of the License, or (at your option) any later version. |
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10 | |
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11 | GCC is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | Library General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU Library General Public |
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17 | License along with GCC; see the file COPYING. If not, write to the Free |
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18 | Software Foundation, Inc., 59 Temple Place - Suite 330, |
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19 | Boston, MA 02111-1307, USA. */ |
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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 '$') and further translation will be done as follows |
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38 | until none of the two conditions below are met: |
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39 | |
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40 | 1) If the filename begins with '@', the string between the '@' and |
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41 | the end of the name or the first '/' or directory separator will |
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42 | be considered a "key" and looked up as follows: |
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43 | |
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44 | -- If this is a Win32 OS, then the Registry will be examined for |
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45 | an entry of "key" in |
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46 | |
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47 | HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\ |
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48 | |
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49 | if found, that value will be used. |
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50 | |
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51 | -- If not found (or not a Win32 OS), the environment variable |
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52 | key_ROOT (the value of "key" concatenated with the constant "_ROOT") |
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53 | is tried. If that fails, then PREFIX (see above) is used. |
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54 | |
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55 | 2) If the filename begins with a '$', the rest of the string up |
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56 | to the end or the first '/' or directory separator will be used |
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57 | as an environment variable, whose value will be returned. |
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58 | |
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59 | Once all this is done, any '/' will be converted to DIR_SEPARATOR, |
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60 | if they are different. |
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61 | |
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62 | NOTE: using resolve_keyed_path under Win32 requires linking with |
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63 | advapi32.dll. */ |
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64 | |
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65 | |
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66 | #include "config.h" |
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67 | #include "gansidecl.h" |
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68 | #ifdef __STDC__ |
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69 | #include <stdarg.h> |
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70 | #else |
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71 | #include <varargs.h> |
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72 | #endif |
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73 | |
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74 | #ifdef _WIN32 |
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75 | #include <windows.h> |
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76 | #endif |
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77 | |
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78 | static char *get_key_value PROTO((char *)); |
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79 | static char *translate_name PROTO((char *)); |
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80 | static char *concat PVPROTO((char *, ...)); |
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81 | static char *save_string PROTO((char *, int)); |
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82 | |
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83 | #ifdef _WIN32 |
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84 | static char *lookup_key PROTO((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 | extern char *getenv (); |
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89 | |
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90 | /* Given KEY, as above, return its value. */ |
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91 | |
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92 | static char * |
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93 | get_key_value (key) |
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94 | char *key; |
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95 | { |
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96 | char *prefix = 0; |
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97 | |
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98 | #ifdef _WIN32 |
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99 | prefix = lookup_key (key); |
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100 | #endif |
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101 | |
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102 | if (prefix == 0) |
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103 | prefix = getenv (concat (key, "_ROOT", NULL_PTR)); |
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104 | |
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105 | return prefix; |
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106 | } |
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107 | |
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108 | /* Concatenate a sequence of strings, returning the result. |
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109 | |
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110 | This function is based on the one in libiberty. */ |
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111 | |
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112 | static char * |
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113 | concat VPROTO((char *first, ...)) |
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114 | { |
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115 | register int length; |
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116 | register char *newstr; |
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117 | register char *end; |
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118 | register char *arg; |
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119 | va_list args; |
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120 | #ifndef __STDC__ |
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121 | char *first; |
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122 | #endif |
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123 | |
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124 | /* First compute the size of the result and get sufficient memory. */ |
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125 | |
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126 | VA_START (args, first); |
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127 | #ifndef __STDC__ |
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128 | first = va_arg (args, char *); |
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129 | #endif |
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130 | |
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131 | arg = first; |
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132 | length = 0; |
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133 | |
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134 | while (arg != 0) |
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135 | { |
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136 | length += strlen (arg); |
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137 | arg = va_arg (args, char *); |
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138 | } |
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139 | |
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140 | newstr = (char *) malloc (length + 1); |
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141 | va_end (args); |
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142 | |
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143 | /* Now copy the individual pieces to the result string. */ |
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144 | |
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145 | VA_START (args, first); |
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146 | #ifndef __STDC__ |
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147 | first = va_arg (args, char *); |
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148 | #endif |
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149 | |
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150 | end = newstr; |
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151 | arg = first; |
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152 | while (arg != 0) |
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153 | { |
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154 | while (*arg) |
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155 | *end++ = *arg++; |
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156 | arg = va_arg (args, char *); |
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157 | } |
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158 | *end = '\000'; |
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159 | va_end (args); |
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160 | |
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161 | return (newstr); |
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162 | } |
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163 | |
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164 | /* Return a copy of a string that has been placed in the heap. */ |
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165 | |
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166 | static char * |
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167 | save_string (s, len) |
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168 | char *s; |
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169 | int len; |
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170 | { |
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171 | register char *result = (char *) malloc (len + 1); |
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172 | |
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173 | bcopy (s, result, len); |
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174 | result[len] = 0; |
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175 | return result; |
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176 | } |
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177 | |
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178 | #ifdef _WIN32 |
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179 | |
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180 | /* Look up "key" in the registry, as above. */ |
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181 | |
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182 | static char * |
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183 | lookup_key (key) |
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184 | char *key; |
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185 | { |
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186 | char *dst; |
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187 | DWORD size; |
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188 | DWORD type; |
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189 | LONG res; |
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190 | |
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191 | if (reg_key == (HKEY) INVALID_HANDLE_VALUE) |
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192 | { |
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193 | res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0, |
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194 | KEY_READ, ®_key); |
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195 | |
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196 | if (res == ERROR_SUCCESS) |
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197 | res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0, |
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198 | KEY_READ, ®_key); |
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199 | |
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200 | if (res != ERROR_SUCCESS) |
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201 | { |
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202 | reg_key = (HKEY) INVALID_HANDLE_VALUE; |
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203 | return 0; |
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204 | } |
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205 | } |
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206 | |
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207 | size = 32; |
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208 | dst = (char *) malloc (size); |
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209 | |
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210 | res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size); |
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211 | if (res == ERROR_MORE_DATA && type == REG_SZ) |
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212 | { |
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213 | dst = (char *) realloc (dst, size); |
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214 | res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size); |
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215 | } |
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216 | |
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217 | if (type != REG_SZ || res != ERROR_SUCCESS) |
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218 | { |
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219 | free (dst); |
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220 | dst = 0; |
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221 | } |
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222 | |
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223 | return dst; |
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224 | } |
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225 | #endif |
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226 | |
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227 | /* If NAME starts with a '@' or '$', apply the translation rules above |
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228 | and return a new name. Otherwise, return the given name. */ |
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229 | |
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230 | static char * |
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231 | translate_name (name) |
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232 | char *name; |
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233 | { |
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234 | char code = name[0]; |
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235 | char *key, *prefix = 0; |
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236 | int keylen; |
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237 | |
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238 | if (code != '@' && code != '$') |
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239 | return name; |
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240 | |
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241 | for (keylen = 0; |
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242 | (name[keylen + 1] != 0 && name[keylen + 1] != '/' |
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243 | #ifdef DIR_SEPARATOR |
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244 | && name[keylen + 1] != DIR_SEPARATOR |
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245 | #endif |
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246 | ); |
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247 | keylen++) |
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248 | ; |
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249 | |
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250 | key = alloca (keylen + 1); |
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251 | strncpy (key, &name[1], keylen); |
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252 | key[keylen] = 0; |
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253 | |
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254 | name = &name[keylen + 1]; |
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255 | |
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256 | if (code == '@') |
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257 | prefix = get_key_value (key); |
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258 | else |
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259 | prefix = getenv (key); |
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260 | |
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261 | if (prefix == 0) |
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262 | prefix = PREFIX; |
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263 | |
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264 | /* Remove any trailing directory separator from what we got. */ |
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265 | if (prefix[strlen (prefix) - 1] == '/' |
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266 | #ifdef DIR_SEPARATOR |
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267 | || prefix[strlen (prefix) - 1] == DIR_SEPARATOR |
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268 | #endif |
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269 | ) |
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270 | { |
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271 | prefix = save_string (prefix, strlen (prefix)); |
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272 | prefix[strlen (prefix) - 1] = 0; |
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273 | } |
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274 | |
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275 | return concat (prefix, name, NULL_PTR); |
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276 | } |
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277 | |
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278 | /* Update PATH using KEY if PATH starts with PREFIX. */ |
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279 | |
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280 | char * |
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281 | update_path (path, key) |
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282 | char *path; |
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283 | char *key; |
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284 | { |
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285 | if (! strncmp (path, PREFIX, strlen (PREFIX)) && key != 0) |
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286 | { |
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287 | if (key[0] != '$') |
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288 | key = concat ("@", key, NULL_PTR); |
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289 | |
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290 | path = concat (key, &path[strlen (PREFIX)], NULL_PTR); |
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291 | |
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292 | while (path[0] == '@' || path[0] == '$') |
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293 | path = translate_name (path); |
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294 | } |
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295 | |
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296 | #ifdef DIR_SEPARATOR |
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297 | if (DIR_SEPARATOR != '/') |
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298 | { |
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299 | int i; |
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300 | int len = strlen (path); |
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301 | |
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302 | path = save_string (path, len); |
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303 | for (i = 0; i < len; i++) |
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304 | if (path[i] == '/') |
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305 | path[i] = DIR_SEPARATOR; |
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306 | } |
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307 | #endif |
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308 | |
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309 | return path; |
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310 | } |
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