1 2 /** 3 * \file streqvcmp.c 4 * 5 * String Equivalence Comparison 6 * 7 * These routines allow any character to be mapped to any other 8 * character before comparison. In processing long option names, 9 * the characters "-", "_" and "^" all need to be equivalent 10 * (because they are treated so by different development environments). 11 * 12 * @addtogroup autoopts 13 * @{ 14 */ 15 /* 16 * This file is part of AutoOpts, a companion to AutoGen. 17 * AutoOpts is free software. 18 * AutoOpts is Copyright (C) 1992-2018 by Bruce Korb - all rights reserved 19 * 20 * AutoOpts is available under any one of two licenses. The license 21 * in use must be one of these two and the choice is under the control 22 * of the user of the license. 23 * 24 * The GNU Lesser General Public License, version 3 or later 25 * See the files "COPYING.lgplv3" and "COPYING.gplv3" 26 * 27 * The Modified Berkeley Software Distribution License 28 * See the file "COPYING.mbsd" 29 * 30 * These files have the following sha256 sums: 31 * 32 * 8584710e9b04216a394078dc156b781d0b47e1729104d666658aecef8ee32e95 COPYING.gplv3 33 * 4379e7444a0e2ce2b12dd6f5a52a27a4d02d39d247901d3285c88cf0d37f477b COPYING.lgplv3 34 * 13aa749a5b0a454917a944ed8fffc530b784f5ead522b1aacaf4ec8aa55a6239 COPYING.mbsd 35 * 36 * This array is designed for mapping upper and lower case letter 37 * together for a case independent comparison. The mappings are 38 * based upon ascii character sequences. 39 */ 40 static unsigned char charmap[] = { 41 NUL, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, '\a', 42 '\b', '\t', NL, '\v', '\f', '\r', 0x0E, 0x0F, 43 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 44 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 45 46 ' ', '!', '"', '#', '$', '%', '&', '\'', 47 '(', ')', '*', '+', ',', '-', '.', '/', 48 '0', '1', '2', '3', '4', '5', '6', '7', 49 '8', '9', ':', ';', '<', '=', '>', '?', 50 51 '@', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 52 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 53 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 54 'x', 'y', 'z', '[', '\\', ']', '^', '_', 55 '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 56 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 57 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 58 'x', 'y', 'z', '{', '|', '}', '~', 0x7f, 59 60 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 61 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 62 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 63 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 64 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 65 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 66 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 67 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 68 69 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 70 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 71 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 72 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 73 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 74 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 75 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 76 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF, 77 }; 78 79 80 /*=export_func strneqvcmp 81 * 82 * what: compare two strings with an equivalence mapping 83 * 84 * arg: + char const * + str1 + first string + 85 * arg: + char const * + str2 + second string + 86 * arg: + int + ct + compare length + 87 * 88 * ret_type: int 89 * ret_desc: the difference between two differing characters 90 * 91 * doc: 92 * 93 * Using a character mapping, two strings are compared for "equivalence". 94 * Each input character is mapped to a comparison character and the 95 * mapped-to characters are compared for the two NUL terminated input strings. 96 * The comparison is limited to @code{ct} bytes. 97 * This function name is mapped to option_strneqvcmp so as to not conflict 98 * with the POSIX name space. 99 * 100 * err: none checked. Caller responsible for seg faults. 101 =*/ 102 int 103 strneqvcmp(char const * s1, char const * s2, int ct) 104 { 105 for (; ct > 0; --ct) { 106 unsigned char u1 = (unsigned char) *s1++; 107 unsigned char u2 = (unsigned char) *s2++; 108 int dif; 109 if (u1 == u2) { 110 if (u1 == NUL) 111 return 0; 112 continue; 113 } 114 115 dif = charmap[ u1 ] - charmap[ u2 ]; 116 117 if (dif != 0) 118 return dif; 119 120 if (u1 == NUL) 121 return 0; 122 } 123 124 return 0; 125 } 126 127 128 /*=export_func streqvcmp 129 * 130 * what: compare two strings with an equivalence mapping 131 * 132 * arg: + char const * + str1 + first string + 133 * arg: + char const * + str2 + second string + 134 * 135 * ret_type: int 136 * ret_desc: the difference between two differing characters 137 * 138 * doc: 139 * 140 * Using a character mapping, two strings are compared for "equivalence". 141 * Each input character is mapped to a comparison character and the 142 * mapped-to characters are compared for the two NUL terminated input strings. 143 * This function name is mapped to option_streqvcmp so as to not conflict 144 * with the POSIX name space. 145 * 146 * err: none checked. Caller responsible for seg faults. 147 =*/ 148 int 149 streqvcmp(char const * s1, char const * s2) 150 { 151 for (;;) { 152 unsigned char u1 = (unsigned char) *s1++; 153 unsigned char u2 = (unsigned char) *s2++; 154 int dif; 155 if (u1 == u2) { 156 if (u1 == NUL) 157 return 0; 158 continue; 159 } 160 161 dif = charmap[ u1 ] - charmap[ u2 ]; 162 163 if (dif != 0) 164 return dif; 165 166 if (u1 == NUL) 167 return 0; 168 } 169 } 170 171 172 /*=export_func streqvmap 173 * 174 * what: Set the character mappings for the streqv functions 175 * 176 * arg: + char + from + Input character + 177 * arg: + char + to + Mapped-to character + 178 * arg: + int + ct + compare length + 179 * 180 * doc: 181 * 182 * Set the character mapping. If the count (@code{ct}) is set to zero, then 183 * the map is cleared by setting all entries in the map to their index 184 * value. Otherwise, the "@code{From}" character is mapped to the "@code{To}" 185 * character. If @code{ct} is greater than 1, then @code{From} and @code{To} 186 * are incremented and the process repeated until @code{ct} entries have been 187 * set. For example, 188 * @example 189 * streqvmap('a', 'A', 26); 190 * @end example 191 * @noindent 192 * will alter the mapping so that all English lower case letters 193 * will map to upper case. 194 * 195 * This function name is mapped to option_streqvmap so as to not conflict 196 * with the POSIX name space. 197 * 198 * err: none. 199 =*/ 200 void 201 streqvmap(char from, char to, int ct) 202 { 203 if (ct == 0) { 204 ct = sizeof(charmap) - 1; 205 do { 206 charmap[ct] = (unsigned char)ct; 207 } while (--ct >= 0); 208 } 209 210 else { 211 unsigned int i_to = (int)to & 0xFF; 212 unsigned int i_from = (int)from & 0xFF; 213 214 do { 215 charmap[i_from] = (unsigned char)i_to; 216 i_from++; 217 i_to++; 218 if ((i_from >= sizeof(charmap)) || (i_to >= sizeof(charmap))) 219 break; 220 } while (--ct > 0); 221 } 222 } 223 224 225 /*=export_func strequate 226 * 227 * what: map a list of characters to the same value 228 * 229 * arg: + char const * + ch_list + characters to equivalence + 230 * 231 * doc: 232 * 233 * Each character in the input string get mapped to the first character 234 * in the string. 235 * This function name is mapped to option_strequate so as to not conflict 236 * with the POSIX name space. 237 * 238 * err: none. 239 =*/ 240 void 241 strequate(char const * s) 242 { 243 if ((s != NULL) && (*s != NUL)) { 244 unsigned char equiv = (unsigned char)*s; 245 while (*s != NUL) 246 charmap[(unsigned char)*(s++)] = equiv; 247 } 248 } 249 250 251 /*=export_func strtransform 252 * 253 * what: convert a string into its mapped-to value 254 * 255 * arg: + char * + dest + output string + 256 * arg: + char const * + src + input string + 257 * 258 * doc: 259 * 260 * Each character in the input string is mapped and the mapped-to 261 * character is put into the output. 262 * This function name is mapped to option_strtransform so as to not conflict 263 * with the POSIX name space. 264 * 265 * The source and destination may be the same. 266 * 267 * err: none. 268 =*/ 269 void 270 strtransform(char * d, char const * s) 271 { 272 do { 273 *(d++) = (char)charmap[(unsigned char)*s]; 274 } while (*(s++) != NUL); 275 } 276 277 /** @} 278 * 279 * Local Variables: 280 * mode: C 281 * c-file-style: "stroustrup" 282 * indent-tabs-mode: nil 283 * End: 284 * end of autoopts/streqvcmp.c */ 285