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Annotation of 43BSDReno/lib/libc/string/strcasecmp.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1987 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #include <sys/stdc.h>
        !            21: #include <string.h>
        !            22: 
        !            23: #if defined(LIBC_SCCS) && !defined(lint)
        !            24: static const char sccsid[] = "@(#)strcasecmp.c 5.9 (Berkeley) 6/1/90";
        !            25: #endif /* LIBC_SCCS and not lint */
        !            26: 
        !            27: typedef unsigned char u_char;
        !            28: 
        !            29: /*
        !            30:  * This array is designed for mapping upper and lower case letter
        !            31:  * together for a case independent comparison.  The mappings are
        !            32:  * based upon ascii character sequences.
        !            33:  */
        !            34: static const u_char charmap[] = {
        !            35:        '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
        !            36:        '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
        !            37:        '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
        !            38:        '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
        !            39:        '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
        !            40:        '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
        !            41:        '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
        !            42:        '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
        !            43:        '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
        !            44:        '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
        !            45:        '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
        !            46:        '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
        !            47:        '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
        !            48:        '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
        !            49:        '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
        !            50:        '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
        !            51:        '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
        !            52:        '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
        !            53:        '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
        !            54:        '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
        !            55:        '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
        !            56:        '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
        !            57:        '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
        !            58:        '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
        !            59:        '\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
        !            60:        '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
        !            61:        '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
        !            62:        '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
        !            63:        '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
        !            64:        '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
        !            65:        '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
        !            66:        '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
        !            67: };
        !            68: 
        !            69: int
        !            70: strcasecmp(s1, s2)
        !            71:        const char *s1, *s2;
        !            72: {
        !            73:        register const u_char *cm = charmap,
        !            74:                        *us1 = (const u_char *)s1,
        !            75:                        *us2 = (const u_char *)s2;
        !            76: 
        !            77:        while (cm[*us1] == cm[*us2++])
        !            78:                if (*us1++ == '\0')
        !            79:                        return (0);
        !            80:        return (cm[*us1] - cm[*--us2]);
        !            81: }
        !            82: 
        !            83: int
        !            84: strncasecmp(s1, s2, n)
        !            85:        const char *s1, *s2;
        !            86:        register size_t n;
        !            87: {
        !            88:        if (n != 0) {
        !            89:                register const u_char *cm = charmap,
        !            90:                                *us1 = (const u_char *)s1,
        !            91:                                *us2 = (const u_char *)s2;
        !            92: 
        !            93:                do {
        !            94:                        if (cm[*us1] != cm[*us2++])
        !            95:                                return (cm[*us1] - cm[*--us2]);
        !            96:                        if (*us1++ == '\0')
        !            97:                                break;
        !            98:                } while (--n != 0);
        !            99:        }
        !           100:        return (0);
        !           101: }

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