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111
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1 /* Utility functions for finding files relative to GCC binaries.
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131
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2 Copyright (C) 1992-2018 Free Software Foundation, Inc.
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111
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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 General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 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 #include "config.h"
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21 #include "system.h"
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22 #include "filenames.h"
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23 #include "file-find.h"
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24
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25 static bool debug = false;
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26
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27 void
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28 find_file_set_debug (bool debug_state)
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29 {
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30 debug = debug_state;
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31 }
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32
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33 char *
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34 find_a_file (struct path_prefix *pprefix, const char *name, int mode)
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35 {
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36 char *temp;
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37 struct prefix_list *pl;
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38 int len = pprefix->max_len + strlen (name) + 1;
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39
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40 if (debug)
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41 fprintf (stderr, "Looking for '%s'\n", name);
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42
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43 #ifdef HOST_EXECUTABLE_SUFFIX
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44 len += strlen (HOST_EXECUTABLE_SUFFIX);
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45 #endif
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46
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47 temp = XNEWVEC (char, len);
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48
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49 /* Determine the filename to execute (special case for absolute paths). */
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50
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51 if (IS_ABSOLUTE_PATH (name))
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52 {
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53 if (access (name, mode) == 0)
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54 {
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55 strcpy (temp, name);
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56
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57 if (debug)
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58 fprintf (stderr, " - found: absolute path\n");
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59
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60 return temp;
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61 }
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62
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63 #ifdef HOST_EXECUTABLE_SUFFIX
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64 /* Some systems have a suffix for executable files.
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65 So try appending that. */
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66 strcpy (temp, name);
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67 strcat (temp, HOST_EXECUTABLE_SUFFIX);
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68
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69 if (access (temp, mode) == 0)
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70 return temp;
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71 #endif
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72
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73 if (debug)
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74 fprintf (stderr, " - failed to locate using absolute path\n");
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75 }
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76 else
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77 for (pl = pprefix->plist; pl; pl = pl->next)
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78 {
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79 struct stat st;
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80
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81 strcpy (temp, pl->prefix);
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82 strcat (temp, name);
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83
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84 if (stat (temp, &st) >= 0
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85 && ! S_ISDIR (st.st_mode)
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86 && access (temp, mode) == 0)
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87 return temp;
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88
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89 #ifdef HOST_EXECUTABLE_SUFFIX
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90 /* Some systems have a suffix for executable files.
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91 So try appending that. */
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92 strcat (temp, HOST_EXECUTABLE_SUFFIX);
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93
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94 if (stat (temp, &st) >= 0
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95 && ! S_ISDIR (st.st_mode)
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96 && access (temp, mode) == 0)
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97 return temp;
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98 #endif
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99 }
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100
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101 if (debug && pprefix->plist == NULL)
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102 fprintf (stderr, " - failed: no entries in prefix list\n");
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103
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104 free (temp);
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105 return 0;
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106 }
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107
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108 /* Add an entry for PREFIX to prefix list PREFIX.
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109 Add at beginning if FIRST is true. */
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110
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111 void
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112 do_add_prefix (struct path_prefix *pprefix, const char *prefix, bool first)
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113 {
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114 struct prefix_list *pl, **prev;
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115 int len;
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116
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117 if (pprefix->plist && !first)
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118 {
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119 for (pl = pprefix->plist; pl->next; pl = pl->next)
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120 ;
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121 prev = &pl->next;
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122 }
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123 else
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124 prev = &pprefix->plist;
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125
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126 /* Keep track of the longest prefix. */
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127
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128 len = strlen (prefix);
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129 if (len > pprefix->max_len)
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130 pprefix->max_len = len;
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131
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132 pl = XNEW (struct prefix_list);
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133 pl->prefix = xstrdup (prefix);
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134
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135 if (*prev)
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136 pl->next = *prev;
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137 else
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138 pl->next = (struct prefix_list *) 0;
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139 *prev = pl;
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140 }
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141
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142 /* Add an entry for PREFIX at the end of prefix list PREFIX. */
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143
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144 void
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145 add_prefix (struct path_prefix *pprefix, const char *prefix)
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146 {
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147 do_add_prefix (pprefix, prefix, false);
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148 }
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149
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150 /* Add an entry for PREFIX at the begin of prefix list PREFIX. */
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151
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152 void
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153 add_prefix_begin (struct path_prefix *pprefix, const char *prefix)
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154 {
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155 do_add_prefix (pprefix, prefix, true);
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156 }
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157
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158 /* Take the value of the environment variable ENV, break it into a path, and
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159 add of the entries to PPREFIX. */
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160
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161 void
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162 prefix_from_env (const char *env, struct path_prefix *pprefix)
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163 {
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164 const char *p;
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165 p = getenv (env);
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166
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167 if (p)
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168 prefix_from_string (p, pprefix);
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169 }
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170
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171 void
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172 prefix_from_string (const char *p, struct path_prefix *pprefix)
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173 {
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174 const char *startp, *endp;
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175 char *nstore = XNEWVEC (char, strlen (p) + 3);
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176
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177 if (debug)
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178 fprintf (stderr, "Convert string '%s' into prefixes, separator = '%c'\n", p, PATH_SEPARATOR);
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179
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180 startp = endp = p;
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181 while (1)
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182 {
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183 if (*endp == PATH_SEPARATOR || *endp == 0)
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184 {
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185 strncpy (nstore, startp, endp-startp);
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186 if (endp == startp)
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187 {
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188 strcpy (nstore, "./");
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189 }
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190 else if (! IS_DIR_SEPARATOR (endp[-1]))
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191 {
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192 nstore[endp-startp] = DIR_SEPARATOR;
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193 nstore[endp-startp+1] = 0;
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194 }
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195 else
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196 nstore[endp-startp] = 0;
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197
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198 if (debug)
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199 fprintf (stderr, " - add prefix: %s\n", nstore);
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200
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201 add_prefix (pprefix, nstore);
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202 if (*endp == 0)
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203 break;
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204 endp = startp = endp + 1;
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205 }
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206 else
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207 endp++;
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208 }
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209 free (nstore);
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210 }
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