/* * $Id: cb437d22b0c48960c9e1c23501fba6e3291fecd8 $ * Time-stamp: "2008-12-26 10:15:46 bkorb" * * String Equivalence Comparison * * These routines allow any character to be mapped to any other * character before comparison. In processing long option names, * the characters "-", "_" and "^" all need to be equivalent * (because they are treated so by different development environments). * * This file is part of AutoOpts, a companion to AutoGen. * AutoOpts is free software. * AutoOpts is copyright (c) 1992-2009 by Bruce Korb - all rights reserved * * AutoOpts is available under any one of two licenses. The license * in use must be one of these two and the choice is under the control * of the user of the license. * * The GNU Lesser General Public License, version 3 or later * See the files "COPYING.lgplv3" and "COPYING.gplv3" * * The Modified Berkeley Software Distribution License * See the file "COPYING.mbsd" * * These files have the following md5sums: * * 43b91e8ca915626ed3818ffb1b71248b pkg/libopts/COPYING.gplv3 * 06a1a2e4760c90ea5e1dad8dfaac4d39 pkg/libopts/COPYING.lgplv3 * 66a5cedaf62c4b2637025f049f9b826f pkg/libopts/COPYING.mbsd * * This array is designed for mapping upper and lower case letter * together for a case independent comparison. The mappings are * based upon ascii character sequences. */ static unsigned char charmap[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, '\a', '\b', '\t', '\n', '\v', '\f', '\r', 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, ' ', '!', '"', '#', '$', '%', '&', '\'', '(', ')', '*', '+', ',', '-', '.', '/', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?', '@', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '[', '\\', ']', '^', '_', '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '{', '|', '}', '~', 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF, }; /*=export_func strneqvcmp * * what: compare two strings with an equivalence mapping * * arg: + char const* + str1 + first string + * arg: + char const* + str2 + second string + * arg: + int + ct + compare length + * * ret_type: int * ret_desc: the difference between two differing characters * * doc: * * Using a character mapping, two strings are compared for "equivalence". * Each input character is mapped to a comparison character and the * mapped-to characters are compared for the two NUL terminated input strings. * The comparison is limited to @code{ct} bytes. * This function name is mapped to option_strneqvcmp so as to not conflict * with the POSIX name space. * * err: none checked. Caller responsible for seg faults. =*/ int strneqvcmp( tCC* s1, tCC* s2, int ct ) { for (; ct > 0; --ct) { unsigned char u1 = (unsigned char) *s1++; unsigned char u2 = (unsigned char) *s2++; int dif = charmap[ u1 ] - charmap[ u2 ]; if (dif != 0) return dif; if (u1 == NUL) return 0; } return 0; } /*=export_func streqvcmp * * what: compare two strings with an equivalence mapping * * arg: + char const* + str1 + first string + * arg: + char const* + str2 + second string + * * ret_type: int * ret_desc: the difference between two differing characters * * doc: * * Using a character mapping, two strings are compared for "equivalence". * Each input character is mapped to a comparison character and the * mapped-to characters are compared for the two NUL terminated input strings. * This function name is mapped to option_streqvcmp so as to not conflict * with the POSIX name space. * * err: none checked. Caller responsible for seg faults. =*/ int streqvcmp( tCC* s1, tCC* s2 ) { for (;;) { unsigned char u1 = (unsigned char) *s1++; unsigned char u2 = (unsigned char) *s2++; int dif = charmap[ u1 ] - charmap[ u2 ]; if (dif != 0) return dif; if (u1 == NUL) return 0; } } /*=export_func streqvmap * * what: Set the character mappings for the streqv functions * * arg: + char + From + Input character + * arg: + char + To + Mapped-to character + * arg: + int + ct + compare length + * * doc: * * Set the character mapping. If the count (@code{ct}) is set to zero, then * the map is cleared by setting all entries in the map to their index * value. Otherwise, the "@code{From}" character is mapped to the "@code{To}" * character. If @code{ct} is greater than 1, then @code{From} and @code{To} * are incremented and the process repeated until @code{ct} entries have been * set. For example, * @example * streqvmap( 'a', 'A', 26 ); * @end example * @noindent * will alter the mapping so that all English lower case letters * will map to upper case. * * This function name is mapped to option_streqvmap so as to not conflict * with the POSIX name space. * * err: none. =*/ void streqvmap( char From, char To, int ct ) { if (ct == 0) { ct = sizeof( charmap ) - 1; do { charmap[ ct ] = ct; } while (--ct >= 0); } else { int chTo = (int)To & 0xFF; int chFrom = (int)From & 0xFF; do { charmap[ chFrom ] = (unsigned)chTo; chFrom++; chTo++; if ((chFrom >= sizeof( charmap )) || (chTo >= sizeof( charmap ))) break; } while (--ct > 0); } } /*=export_func strequate * * what: map a list of characters to the same value * * arg: + char const* + ch_list + characters to equivalence + * * doc: * * Each character in the input string get mapped to the first character * in the string. * This function name is mapped to option_strequate so as to not conflict * with the POSIX name space. * * err: none. =*/ void strequate( char const* s ) { if ((s != NULL) && (*s != NUL)) { unsigned char equiv = (unsigned)*s; while (*s != NUL) charmap[ (unsigned)*(s++) ] = equiv; } } /*=export_func strtransform * * what: convert a string into its mapped-to value * * arg: + char* + dest + output string + * arg: + char const* + src + input string + * * doc: * * Each character in the input string is mapped and the mapped-to * character is put into the output. * This function name is mapped to option_strtransform so as to not conflict * with the POSIX name space. * * The source and destination may be the same. * * err: none. =*/ void strtransform( char* d, char const* s ) { do { *(d++) = (char)charmap[ (unsigned)*s ]; } while (*(s++) != NUL); } /* * Local Variables: * mode: C * c-file-style: "stroustrup" * indent-tabs-mode: nil * End: * end of autoopts/streqvcmp.c */