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0
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1 /* Utility to update paths from internal to external forms.
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131
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2 Copyright (C) 1997-2018 Free Software Foundation, Inc.
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0
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU Library General Public License as published by
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8 the Free Software Foundation; either version 3 of the License, or (at
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9 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 COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 /* This file contains routines to update a path, both to canonicalize
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21 the directory format and to handle any prefix translation.
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22
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23 This file must be compiled with -DPREFIX= to specify the "prefix"
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24 value used by configure. If a filename does not begin with this
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25 prefix, it will not be affected other than by directory canonicalization.
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26
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27 Each caller of 'update_path' may specify both a filename and
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28 a translation prefix and consist of the name of the package that contains
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29 the file ("@GCC", "@BINUTIL", "@GNU", etc).
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30
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31 If the prefix is not specified, the filename will only undergo
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32 directory canonicalization.
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33
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34 If it is specified, the string given by PREFIX will be replaced
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35 by the specified prefix (with a '@' in front unless the prefix begins
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36 with a '$') and further translation will be done as follows
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37 until none of the two conditions below are met:
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38
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39 1) If the filename begins with '@', the string between the '@' and
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40 the end of the name or the first '/' or directory separator will
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41 be considered a "key" and looked up as follows:
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42
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43 -- If this is a Win32 OS, then the Registry will be examined for
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44 an entry of "key" in
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45
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46 HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\<KEY>
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47
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48 if found, that value will be used. <KEY> defaults to GCC version
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49 string, but can be overridden at configuration time.
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50
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51 -- If not found (or not a Win32 OS), the environment variable
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52 key_ROOT (the value of "key" concatenated with the constant "_ROOT")
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53 is tried. If that fails, then PREFIX (see above) is used.
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54
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55 2) If the filename begins with a '$', 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 "system.h"
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68 #include "coretypes.h"
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69 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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70 #include <windows.h>
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71 #endif
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72 #include "prefix.h"
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111
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73 #include "common/common-target.h"
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0
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74
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75 static const char *std_prefix = PREFIX;
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76
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77 static const char *get_key_value (char *);
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78 static char *translate_name (char *);
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79 static char *save_string (const char *, int);
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80 static void tr (char *, int, int);
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81
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82 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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83 static char *lookup_key (char *);
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84 static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
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85 #endif
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86
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87 /* Given KEY, as above, return its value. */
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88
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89 static const char *
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90 get_key_value (char *key)
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91 {
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92 const char *prefix = 0;
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93 char *temp = 0;
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94
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95 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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96 prefix = lookup_key (key);
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97 #endif
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98
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99 if (prefix == 0)
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100 prefix = getenv (temp = concat (key, "_ROOT", NULL));
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101
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102 if (prefix == 0)
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103 prefix = std_prefix;
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104
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111
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105 free (temp);
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0
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106
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107 return prefix;
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108 }
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109
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110 /* Return a copy of a string that has been placed in the heap. */
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111
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112 static char *
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113 save_string (const char *s, int len)
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114 {
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115 char *result = XNEWVEC (char, len + 1);
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116
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117 memcpy (result, s, len);
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118 result[len] = 0;
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119 return result;
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120 }
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121
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122 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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123
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124 #ifndef WIN32_REGISTRY_KEY
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125 # define WIN32_REGISTRY_KEY BASEVER
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126 #endif
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127
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128 /* Look up "key" in the registry, as above. */
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129
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130 static char *
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131 lookup_key (char *key)
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132 {
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133 char *dst;
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134 DWORD size;
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135 DWORD type;
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136 LONG res;
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137
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138 if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
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139 {
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140 res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
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141 KEY_READ, ®_key);
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142
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143 if (res == ERROR_SUCCESS)
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144 res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
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145 KEY_READ, ®_key);
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146
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147 if (res == ERROR_SUCCESS)
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148 res = RegOpenKeyExA (reg_key, WIN32_REGISTRY_KEY, 0,
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149 KEY_READ, ®_key);
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150
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151 if (res != ERROR_SUCCESS)
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152 {
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153 reg_key = (HKEY) INVALID_HANDLE_VALUE;
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154 return 0;
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155 }
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156 }
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157
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158 size = 32;
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111
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159 dst = XNEWVEC (char, size);
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0
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160
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161 res = RegQueryValueExA (reg_key, key, 0, &type, (LPBYTE) dst, &size);
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162 if (res == ERROR_MORE_DATA && type == REG_SZ)
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163 {
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111
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164 dst = XRESIZEVEC (char, dst, size);
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0
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165 res = RegQueryValueExA (reg_key, key, 0, &type, (LPBYTE) dst, &size);
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166 }
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167
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168 if (type != REG_SZ || res != ERROR_SUCCESS)
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169 {
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170 free (dst);
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171 dst = 0;
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172 }
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173
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174 return dst;
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175 }
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176 #endif
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177
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178 /* If NAME, a malloc-ed string, starts with a '@' or '$', apply the
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179 translation rules above and return a newly malloc-ed name.
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180 Otherwise, return the given name. */
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181
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182 static char *
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183 translate_name (char *name)
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184 {
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185 char code;
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186 char *key, *old_name;
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187 const char *prefix;
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188 int keylen;
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189
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190 for (;;)
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191 {
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192 code = name[0];
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193 if (code != '@' && code != '$')
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194 break;
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195
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196 for (keylen = 0;
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197 (name[keylen + 1] != 0 && !IS_DIR_SEPARATOR (name[keylen + 1]));
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198 keylen++)
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199 ;
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200
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201 key = (char *) alloca (keylen + 1);
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131
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202 memcpy (key, &name[1], keylen);
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0
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203 key[keylen] = 0;
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204
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205 if (code == '@')
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206 {
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207 prefix = get_key_value (key);
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208 if (prefix == 0)
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209 prefix = std_prefix;
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210 }
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211 else
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212 prefix = getenv (key);
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213
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214 if (prefix == 0)
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215 prefix = PREFIX;
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216
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217 /* We used to strip trailing DIR_SEPARATORs here, but that can
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218 sometimes yield a result with no separator when one was coded
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219 and intended by the user, causing two path components to run
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220 together. */
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221
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222 old_name = name;
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223 name = concat (prefix, &name[keylen + 1], NULL);
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224 free (old_name);
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225 }
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226
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227 return name;
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228 }
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229
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230 /* In a NUL-terminated STRING, replace character C1 with C2 in-place. */
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231 static void
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232 tr (char *string, int c1, int c2)
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233 {
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234 do
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235 {
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236 if (*string == c1)
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237 *string = c2;
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238 }
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239 while (*string++);
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240 }
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241
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242 /* Update PATH using KEY if PATH starts with PREFIX as a directory.
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243 The returned string is always malloc-ed, and the caller is
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244 responsible for freeing it. */
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245
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246 char *
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247 update_path (const char *path, const char *key)
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248 {
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249 char *result, *p;
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250 const int len = strlen (std_prefix);
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251
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111
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252 if (! filename_ncmp (path, std_prefix, len)
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253 && (IS_DIR_SEPARATOR (path[len])
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0
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254 || path[len] == '\0')
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255 && key != 0)
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256 {
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257 bool free_key = false;
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258
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259 if (key[0] != '$')
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260 {
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261 key = concat ("@", key, NULL);
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262 free_key = true;
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263 }
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264
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265 result = concat (key, &path[len], NULL);
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266 if (free_key)
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267 free (CONST_CAST (char *, key));
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268 result = translate_name (result);
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269 }
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270 else
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271 result = xstrdup (path);
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272
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273 p = result;
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274 while (1)
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275 {
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276 char *src, *dest;
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277
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278 p = strchr (p, '.');
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279 if (p == NULL)
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280 break;
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281 /* Look for `/../' */
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282 if (p[1] == '.'
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283 && IS_DIR_SEPARATOR (p[2])
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284 && (p != result && IS_DIR_SEPARATOR (p[-1])))
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285 {
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286 *p = 0;
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111
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287 if (!targetm_common.always_strip_dotdot
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288 && access (result, X_OK) == 0)
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0
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289 {
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290 *p = '.';
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291 break;
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292 }
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293 else
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294 {
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295 /* We can't access the dir, so we won't be able to
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296 access dir/.. either. Strip out `dir/../'. If `dir'
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297 turns out to be `.', strip one more path component. */
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298 dest = p;
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299 do
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300 {
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301 --dest;
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302 while (dest != result && IS_DIR_SEPARATOR (*dest))
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303 --dest;
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304 while (dest != result && !IS_DIR_SEPARATOR (dest[-1]))
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305 --dest;
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306 }
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307 while (dest != result && *dest == '.');
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308 /* If we have something like `./..' or `/..', don't
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309 strip anything more. */
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310 if (*dest == '.' || IS_DIR_SEPARATOR (*dest))
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311 {
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312 *p = '.';
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313 break;
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314 }
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315 src = p + 3;
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316 while (IS_DIR_SEPARATOR (*src))
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317 ++src;
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318 p = dest;
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319 while ((*dest++ = *src++) != 0)
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320 ;
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321 }
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322 }
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323 else
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324 ++p;
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325 }
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326
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327 #ifdef UPDATE_PATH_HOST_CANONICALIZE
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328 /* Perform host dependent canonicalization when needed. */
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329 UPDATE_PATH_HOST_CANONICALIZE (result);
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330 #endif
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331
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332 #ifdef DIR_SEPARATOR_2
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333 /* Convert DIR_SEPARATOR_2 to DIR_SEPARATOR. */
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334 if (DIR_SEPARATOR_2 != DIR_SEPARATOR)
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335 tr (result, DIR_SEPARATOR_2, DIR_SEPARATOR);
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336 #endif
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337
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338 #if defined (DIR_SEPARATOR) && !defined (DIR_SEPARATOR_2)
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339 if (DIR_SEPARATOR != '/')
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340 tr (result, '/', DIR_SEPARATOR);
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341 #endif
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342
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343 return result;
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344 }
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345
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346 /* Reset the standard prefix. */
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347 void
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348 set_std_prefix (const char *prefix, int len)
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349 {
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350 std_prefix = save_string (prefix, len);
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351 }
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