1 2/* 3 * $Id: cb437d22b0c48960c9e1c23501fba6e3291fecd8 $ 4 * Time-stamp: "2008-12-26 10:15:46 bkorb" 5 * 6 * String Equivalence Comparison 7 * 8 * These routines allow any character to be mapped to any other 9 * character before comparison. In processing long option names, 10 * the characters "-", "_" and "^" all need to be equivalent 11 * (because they are treated so by different development environments). 12 * 13 * This file is part of AutoOpts, a companion to AutoGen. 14 * AutoOpts is free software. 15 * AutoOpts is copyright (c) 1992-2009 by Bruce Korb - all rights reserved 16 * 17 * AutoOpts is available under any one of two licenses. The license 18 * in use must be one of these two and the choice is under the control 19 * of the user of the license. 20 * 21 * The GNU Lesser General Public License, version 3 or later 22 * See the files "COPYING.lgplv3" and "COPYING.gplv3" 23 * 24 * The Modified Berkeley Software Distribution License 25 * See the file "COPYING.mbsd" 26 * 27 * These files have the following md5sums: 28 * 29 * 43b91e8ca915626ed3818ffb1b71248b pkg/libopts/COPYING.gplv3 30 * 06a1a2e4760c90ea5e1dad8dfaac4d39 pkg/libopts/COPYING.lgplv3 31 * 66a5cedaf62c4b2637025f049f9b826f pkg/libopts/COPYING.mbsd 32 * 33 * This array is designed for mapping upper and lower case letter 34 * together for a case independent comparison. The mappings are 35 * based upon ascii character sequences. 36 */ 37static unsigned char charmap[] = { 38 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, '\a', 39 '\b', '\t', '\n', '\v', '\f', '\r', 0x0E, 0x0F, 40 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 41 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 42 43 ' ', '!', '"', '#', '$', '%', '&', '\'', 44 '(', ')', '*', '+', ',', '-', '.', '/', 45 '0', '1', '2', '3', '4', '5', '6', '7', 46 '8', '9', ':', ';', '<', '=', '>', '?', 47 48 '@', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 49 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 50 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 51 'x', 'y', 'z', '[', '\\', ']', '^', '_', 52 '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 53 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 54 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 55 'x', 'y', 'z', '{', '|', '}', '~', 0x7f, 56 57 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 58 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 59 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 60 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 61 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 62 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 63 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 64 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 65 66 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 67 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 68 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 69 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 70 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 71 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 72 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 73 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF, 74}; 75 76 77/*=export_func strneqvcmp 78 * 79 * what: compare two strings with an equivalence mapping 80 * 81 * arg: + char const* + str1 + first string + 82 * arg: + char const* + str2 + second string + 83 * arg: + int + ct + compare length + 84 * 85 * ret_type: int 86 * ret_desc: the difference between two differing characters 87 * 88 * doc: 89 * 90 * Using a character mapping, two strings are compared for "equivalence". 91 * Each input character is mapped to a comparison character and the 92 * mapped-to characters are compared for the two NUL terminated input strings. 93 * The comparison is limited to @code{ct} bytes. 94 * This function name is mapped to option_strneqvcmp so as to not conflict 95 * with the POSIX name space. 96 * 97 * err: none checked. Caller responsible for seg faults. 98=*/ 99int 100strneqvcmp( tCC* s1, tCC* s2, int ct ) 101{ 102 for (; ct > 0; --ct) { 103 unsigned char u1 = (unsigned char) *s1++; 104 unsigned char u2 = (unsigned char) *s2++; 105 int dif = charmap[ u1 ] - charmap[ u2 ]; 106 107 if (dif != 0) 108 return dif; 109 110 if (u1 == NUL) 111 return 0; 112 } 113 114 return 0; 115} 116 117 118/*=export_func streqvcmp 119 * 120 * what: compare two strings with an equivalence mapping 121 * 122 * arg: + char const* + str1 + first string + 123 * arg: + char const* + str2 + second string + 124 * 125 * ret_type: int 126 * ret_desc: the difference between two differing characters 127 * 128 * doc: 129 * 130 * Using a character mapping, two strings are compared for "equivalence". 131 * Each input character is mapped to a comparison character and the 132 * mapped-to characters are compared for the two NUL terminated input strings. 133 * This function name is mapped to option_streqvcmp so as to not conflict 134 * with the POSIX name space. 135 * 136 * err: none checked. Caller responsible for seg faults. 137=*/ 138int 139streqvcmp( tCC* s1, tCC* s2 ) 140{ 141 for (;;) { 142 unsigned char u1 = (unsigned char) *s1++; 143 unsigned char u2 = (unsigned char) *s2++; 144 int dif = charmap[ u1 ] - charmap[ u2 ]; 145 146 if (dif != 0) 147 return dif; 148 149 if (u1 == NUL) 150 return 0; 151 } 152} 153 154 155/*=export_func streqvmap 156 * 157 * what: Set the character mappings for the streqv functions 158 * 159 * arg: + char + From + Input character + 160 * arg: + char + To + Mapped-to character + 161 * arg: + int + ct + compare length + 162 * 163 * doc: 164 * 165 * Set the character mapping. If the count (@code{ct}) is set to zero, then 166 * the map is cleared by setting all entries in the map to their index 167 * value. Otherwise, the "@code{From}" character is mapped to the "@code{To}" 168 * character. If @code{ct} is greater than 1, then @code{From} and @code{To} 169 * are incremented and the process repeated until @code{ct} entries have been 170 * set. For example, 171 * @example 172 * streqvmap( 'a', 'A', 26 ); 173 * @end example 174 * @noindent 175 * will alter the mapping so that all English lower case letters 176 * will map to upper case. 177 * 178 * This function name is mapped to option_streqvmap so as to not conflict 179 * with the POSIX name space. 180 * 181 * err: none. 182=*/ 183void 184streqvmap( char From, char To, int ct ) 185{ 186 if (ct == 0) { 187 ct = sizeof( charmap ) - 1; 188 do { 189 charmap[ ct ] = ct; 190 } while (--ct >= 0); 191 } 192 193 else { 194 int chTo = (int)To & 0xFF; 195 int chFrom = (int)From & 0xFF; 196 197 do { 198 charmap[ chFrom ] = (unsigned)chTo; 199 chFrom++; 200 chTo++; 201 if ((chFrom >= sizeof( charmap )) || (chTo >= sizeof( charmap ))) 202 break; 203 } while (--ct > 0); 204 } 205} 206 207 208/*=export_func strequate 209 * 210 * what: map a list of characters to the same value 211 * 212 * arg: + char const* + ch_list + characters to equivalence + 213 * 214 * doc: 215 * 216 * Each character in the input string get mapped to the first character 217 * in the string. 218 * This function name is mapped to option_strequate so as to not conflict 219 * with the POSIX name space. 220 * 221 * err: none. 222=*/ 223void 224strequate( char const* s ) 225{ 226 if ((s != NULL) && (*s != NUL)) { 227 unsigned char equiv = (unsigned)*s; 228 while (*s != NUL) 229 charmap[ (unsigned)*(s++) ] = equiv; 230 } 231} 232 233 234/*=export_func strtransform 235 * 236 * what: convert a string into its mapped-to value 237 * 238 * arg: + char* + dest + output string + 239 * arg: + char const* + src + input string + 240 * 241 * doc: 242 * 243 * Each character in the input string is mapped and the mapped-to 244 * character is put into the output. 245 * This function name is mapped to option_strtransform so as to not conflict 246 * with the POSIX name space. 247 * 248 * The source and destination may be the same. 249 * 250 * err: none. 251=*/ 252void 253strtransform( char* d, char const* s ) 254{ 255 do { 256 *(d++) = (char)charmap[ (unsigned)*s ]; 257 } while (*(s++) != NUL); 258} 259 260/* 261 * Local Variables: 262 * mode: C 263 * c-file-style: "stroustrup" 264 * indent-tabs-mode: nil 265 * End: 266 * end of autoopts/streqvcmp.c */ 267