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5191 | serge | 1 | /* File name comparison routine. |
2 | |||
3 | Copyright (C) 2007 Free Software Foundation, Inc. |
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4 | |||
5 | This program is free software; you can redistribute it and/or modify |
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6 | it under the terms of the GNU General Public License as published by |
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7 | the Free Software Foundation; either version 2, or (at your option) |
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8 | any later version. |
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9 | |||
10 | This program is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | GNU General Public License for more details. |
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14 | |||
15 | You should have received a copy of the GNU General Public License |
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16 | along with this program; if not, write to the Free Software Foundation, |
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17 | Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
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18 | |||
19 | #ifdef HAVE_CONFIG_H |
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20 | #include "config.h" |
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21 | #endif |
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22 | |||
23 | #ifdef HAVE_STRING_H |
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24 | #include |
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25 | #endif |
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26 | |||
6324 | serge | 27 | #ifdef HAVE_STDLIB_H |
28 | #include |
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29 | #endif |
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30 | |||
5191 | serge | 31 | #include "filenames.h" |
32 | #include "safe-ctype.h" |
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6324 | serge | 33 | #include "libiberty.h" |
5191 | serge | 34 | |
35 | /* |
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36 | |||
37 | @deftypefn Extension int filename_cmp (const char *@var{s1}, const char *@var{s2}) |
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38 | |||
39 | Return zero if the two file names @var{s1} and @var{s2} are equivalent. |
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40 | If not equivalent, the returned value is similar to what @code{strcmp} |
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41 | would return. In other words, it returns a negative value if @var{s1} |
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42 | is less than @var{s2}, or a positive value if @var{s2} is greater than |
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43 | @var{s2}. |
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44 | |||
45 | This function does not normalize file names. As a result, this function |
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46 | will treat filenames that are spelled differently as different even in |
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47 | the case when the two filenames point to the same underlying file. |
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48 | However, it does handle the fact that on DOS-like file systems, forward |
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49 | and backward slashes are equal. |
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50 | |||
51 | @end deftypefn |
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52 | |||
53 | */ |
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54 | |||
55 | int |
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56 | filename_cmp (const char *s1, const char *s2) |
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57 | { |
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58 | #if !defined(HAVE_DOS_BASED_FILE_SYSTEM) \ |
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59 | && !defined(HAVE_CASE_INSENSITIVE_FILE_SYSTEM) |
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60 | return strcmp(s1, s2); |
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61 | #else |
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62 | for (;;) |
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63 | { |
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64 | int c1 = *s1; |
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65 | int c2 = *s2; |
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66 | |||
67 | #if defined (HAVE_CASE_INSENSITIVE_FILE_SYSTEM) |
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68 | c1 = TOLOWER (c1); |
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69 | c2 = TOLOWER (c2); |
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70 | #endif |
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71 | |||
72 | #if defined (HAVE_DOS_BASED_FILE_SYSTEM) |
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73 | /* On DOS-based file systems, the '/' and the '\' are equivalent. */ |
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74 | if (c1 == '/') |
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75 | c1 = '\\'; |
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76 | if (c2 == '/') |
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77 | c2 = '\\'; |
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78 | #endif |
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79 | |||
80 | if (c1 != c2) |
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81 | return (c1 - c2); |
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82 | |||
83 | if (c1 == '\0') |
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84 | return 0; |
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85 | |||
86 | s1++; |
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87 | s2++; |
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88 | } |
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89 | #endif |
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90 | } |
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91 | |||
92 | /* |
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93 | |||
94 | @deftypefn Extension int filename_ncmp (const char *@var{s1}, const char *@var{s2}, size_t @var{n}) |
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95 | |||
96 | Return zero if the two file names @var{s1} and @var{s2} are equivalent |
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97 | in range @var{n}. |
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98 | If not equivalent, the returned value is similar to what @code{strncmp} |
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99 | would return. In other words, it returns a negative value if @var{s1} |
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100 | is less than @var{s2}, or a positive value if @var{s2} is greater than |
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101 | @var{s2}. |
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102 | |||
103 | This function does not normalize file names. As a result, this function |
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104 | will treat filenames that are spelled differently as different even in |
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105 | the case when the two filenames point to the same underlying file. |
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106 | However, it does handle the fact that on DOS-like file systems, forward |
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107 | and backward slashes are equal. |
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108 | |||
109 | @end deftypefn |
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110 | |||
111 | */ |
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112 | |||
113 | int |
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114 | filename_ncmp (const char *s1, const char *s2, size_t n) |
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115 | { |
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116 | #if !defined(HAVE_DOS_BASED_FILE_SYSTEM) \ |
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117 | && !defined(HAVE_CASE_INSENSITIVE_FILE_SYSTEM) |
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118 | return strncmp(s1, s2, n); |
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119 | #else |
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120 | if (!n) |
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121 | return 0; |
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122 | for (; n > 0; --n) |
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123 | { |
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124 | int c1 = *s1; |
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125 | int c2 = *s2; |
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126 | |||
127 | #if defined (HAVE_CASE_INSENSITIVE_FILE_SYSTEM) |
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128 | c1 = TOLOWER (c1); |
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129 | c2 = TOLOWER (c2); |
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130 | #endif |
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131 | |||
132 | #if defined (HAVE_DOS_BASED_FILE_SYSTEM) |
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133 | /* On DOS-based file systems, the '/' and the '\' are equivalent. */ |
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134 | if (c1 == '/') |
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135 | c1 = '\\'; |
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136 | if (c2 == '/') |
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137 | c2 = '\\'; |
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138 | #endif |
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139 | |||
140 | if (c1 == '\0' || c1 != c2) |
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141 | return (c1 - c2); |
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142 | |||
143 | s1++; |
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144 | s2++; |
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145 | } |
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146 | return 0; |
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147 | #endif |
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148 | } |
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149 | |||
150 | /* |
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151 | |||
152 | @deftypefn Extension hashval_t filename_hash (const void *@var{s}) |
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153 | |||
154 | Return the hash value for file name @var{s} that will be compared |
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155 | using filename_cmp. |
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156 | This function is for use with hashtab.c hash tables. |
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157 | |||
158 | @end deftypefn |
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159 | |||
160 | */ |
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161 | |||
162 | hashval_t |
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163 | filename_hash (const void *s) |
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164 | { |
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165 | /* The cast is for -Wc++-compat. */ |
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166 | const unsigned char *str = (const unsigned char *) s; |
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167 | hashval_t r = 0; |
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168 | unsigned char c; |
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169 | |||
170 | while ((c = *str++) != 0) |
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171 | { |
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172 | if (c == '\\') |
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173 | c = '/'; |
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174 | c = TOLOWER (c); |
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175 | r = r * 67 + c - 113; |
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176 | } |
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177 | |||
178 | return r; |
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179 | } |
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180 | |||
181 | /* |
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182 | |||
183 | @deftypefn Extension int filename_eq (const void *@var{s1}, const void *@var{s2}) |
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184 | |||
185 | Return non-zero if file names @var{s1} and @var{s2} are equivalent. |
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186 | This function is for use with hashtab.c hash tables. |
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187 | |||
188 | @end deftypefn |
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189 | |||
190 | */ |
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191 | |||
192 | int |
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193 | filename_eq (const void *s1, const void *s2) |
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194 | { |
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195 | /* The casts are for -Wc++-compat. */ |
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196 | return filename_cmp ((const char *) s1, (const char *) s2) == 0; |
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197 | } |
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6324 | serge | 198 | |
199 | /* |
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200 | |||
201 | @deftypefn Extension int canonical_filename_eq (const char *@var{a}, const char *@var{b}) |
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202 | |||
203 | Return non-zero if file names @var{a} and @var{b} are equivalent. |
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204 | This function compares the canonical versions of the filenames as returned by |
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205 | @code{lrealpath()}, so that so that different file names pointing to the same |
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206 | underlying file are treated as being identical. |
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207 | |||
208 | @end deftypefn |
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209 | |||
210 | */ |
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211 | |||
212 | int |
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213 | canonical_filename_eq (const char * a, const char * b) |
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214 | { |
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215 | char * ca = lrealpath(a); |
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216 | char * cb = lrealpath(b); |
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217 | int res = filename_eq (ca, cb); |
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218 | free (ca); |
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219 | free (cb); |
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220 | return res; |
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221 | } |