290 lines
9.0 KiB
C
290 lines
9.0 KiB
C
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/*
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* $Id: streqvcmp.c,v 4.10 2007/04/28 22:19:23 bkorb Exp $
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* Time-stamp: "2006-07-26 18:25:53 bkorb"
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*
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* String Equivalence Comparison
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*
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* These routines allow any character to be mapped to any other
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* character before comparison. In processing long option names,
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* the characters "-", "_" and "^" all need to be equivalent
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* (because they are treated so by different development environments).
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*/
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/*
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* Automated Options copyright 1992-2007 Bruce Korb
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*
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* Automated Options is free software.
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* You may redistribute it and/or modify it under the terms of the
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* GNU General Public License, as published by the Free Software
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* Foundation; either version 2, or (at your option) any later version.
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*
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* Automated Options is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Automated Options. See the file "COPYING". If not,
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* write to: The Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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* As a special exception, Bruce Korb gives permission for additional
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* uses of the text contained in his release of AutoOpts.
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*
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* The exception is that, if you link the AutoOpts library with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the AutoOpts library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by Bruce Korb under
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* the name AutoOpts. If you copy code from other sources under the
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* General Public License into a copy of AutoOpts, as the General Public
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* License permits, the exception does not apply to the code that you add
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* in this way. To avoid misleading anyone as to the status of such
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* modified files, you must delete this exception notice from them.
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*
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* If you write modifications of your own for AutoOpts, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*/
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/*
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* This array is designed for mapping upper and lower case letter
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* together for a case independent comparison. The mappings are
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* based upon ascii character sequences.
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*/
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static unsigned char charmap[] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, '\a',
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'\b', '\t', '\n', '\v', '\f', '\r', 0x0E, 0x0F,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
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' ', '!', '"', '#', '$', '%', '&', '\'',
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'(', ')', '*', '+', ',', '-', '.', '/',
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', ':', ';', '<', '=', '>', '?',
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'@', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
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'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
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'x', 'y', 'z', '[', '\\', ']', '^', '_',
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'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
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'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
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'x', 'y', 'z', '{', '|', '}', '~', 0x7f,
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0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
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0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
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0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
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0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
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0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
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0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7,
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0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
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0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
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0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
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0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
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0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
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0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
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0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
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0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
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0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF,
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};
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/*=export_func strneqvcmp
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*
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* what: compare two strings with an equivalence mapping
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*
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* arg: + char const* + str1 + first string +
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* arg: + char const* + str2 + second string +
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* arg: + int + ct + compare length +
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*
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* ret_type: int
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* ret_desc: the difference between two differing characters
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*
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* doc:
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*
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* Using a character mapping, two strings are compared for "equivalence".
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* Each input character is mapped to a comparison character and the
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* mapped-to characters are compared for the two NUL terminated input strings.
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* The comparison is limited to @code{ct} bytes.
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* This function name is mapped to option_strneqvcmp so as to not conflict
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* with the POSIX name space.
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*
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* err: none checked. Caller responsible for seg faults.
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=*/
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int
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strneqvcmp( tCC* s1, tCC* s2, int ct )
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{
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for (; ct > 0; --ct) {
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unsigned char u1 = (unsigned char) *s1++;
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unsigned char u2 = (unsigned char) *s2++;
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int dif = charmap[ u1 ] - charmap[ u2 ];
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if (dif != 0)
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return dif;
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if (u1 == NUL)
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return 0;
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}
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return 0;
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}
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/*=export_func streqvcmp
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*
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* what: compare two strings with an equivalence mapping
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*
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* arg: + char const* + str1 + first string +
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* arg: + char const* + str2 + second string +
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*
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* ret_type: int
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* ret_desc: the difference between two differing characters
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*
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* doc:
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*
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* Using a character mapping, two strings are compared for "equivalence".
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* Each input character is mapped to a comparison character and the
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* mapped-to characters are compared for the two NUL terminated input strings.
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* This function name is mapped to option_streqvcmp so as to not conflict
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* with the POSIX name space.
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*
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* err: none checked. Caller responsible for seg faults.
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=*/
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int
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streqvcmp( tCC* s1, tCC* s2 )
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{
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for (;;) {
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unsigned char u1 = (unsigned char) *s1++;
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unsigned char u2 = (unsigned char) *s2++;
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int dif = charmap[ u1 ] - charmap[ u2 ];
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if (dif != 0)
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return dif;
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if (u1 == NUL)
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return 0;
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}
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}
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/*=export_func streqvmap
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*
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* what: Set the character mappings for the streqv functions
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*
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* arg: + char + From + Input character +
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* arg: + char + To + Mapped-to character +
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* arg: + int + ct + compare length +
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*
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* doc:
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*
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* Set the character mapping. If the count (@code{ct}) is set to zero, then
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* the map is cleared by setting all entries in the map to their index
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* value. Otherwise, the "@code{From}" character is mapped to the "@code{To}"
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* character. If @code{ct} is greater than 1, then @code{From} and @code{To}
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* are incremented and the process repeated until @code{ct} entries have been
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* set. For example,
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* @example
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* streqvmap( 'a', 'A', 26 );
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* @end example
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* @noindent
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* will alter the mapping so that all English lower case letters
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* will map to upper case.
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*
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* This function name is mapped to option_streqvmap so as to not conflict
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* with the POSIX name space.
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*
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* err: none.
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=*/
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void
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streqvmap( char From, char To, int ct )
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{
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if (ct == 0) {
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ct = sizeof( charmap ) - 1;
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do {
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charmap[ ct ] = ct;
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} while (--ct >= 0);
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}
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else {
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int chTo = (int)To & 0xFF;
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int chFrom = (int)From & 0xFF;
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do {
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charmap[ chFrom ] = (unsigned)chTo;
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chFrom++;
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chTo++;
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if ((chFrom >= sizeof( charmap )) || (chTo >= sizeof( charmap )))
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break;
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} while (--ct > 0);
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}
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}
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/*=export_func strequate
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*
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* what: map a list of characters to the same value
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*
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* arg: + char const* + ch_list + characters to equivalence +
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*
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* doc:
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*
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* Each character in the input string get mapped to the first character
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* in the string.
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* This function name is mapped to option_strequate so as to not conflict
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* with the POSIX name space.
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*
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* err: none.
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=*/
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void
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strequate( char const* s )
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{
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if ((s != NULL) && (*s != NUL)) {
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unsigned char equiv = (unsigned)*s;
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while (*s != NUL)
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charmap[ (unsigned)*(s++) ] = equiv;
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}
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}
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/*=export_func strtransform
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*
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* what: convert a string into its mapped-to value
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*
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* arg: + char* + dest + output string +
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* arg: + char const* + src + input string +
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*
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* doc:
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*
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* Each character in the input string is mapped and the mapped-to
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* character is put into the output.
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* This function name is mapped to option_strtransform so as to not conflict
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* with the POSIX name space.
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*
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* err: none.
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=*/
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void
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strtransform( char* d, char const* s )
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{
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do {
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*(d++) = (char)charmap[ (unsigned)*s ];
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} while (*(s++) != NUL);
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}
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/*
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* Local Variables:
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* mode: C
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* c-file-style: "stroustrup"
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* indent-tabs-mode: nil
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* End:
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* end of autoopts/streqvcmp.c */
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