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Annotation of 43BSDTahoe/lib/libc/gen/strcasecmp.c, revision 1.1.1.1

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 the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #if defined(LIBC_SCCS) && !defined(lint)
                     19: static char sccsid[] = "@(#)strcasecmp.c       5.6 (Berkeley) 6/27/88";
                     20: #endif /* LIBC_SCCS and not lint */
                     21: 
                     22: #include <sys/types.h>
                     23: 
                     24: /*
                     25:  * This array is designed for mapping upper and lower case letter
                     26:  * together for a case independent comparison.  The mappings are
                     27:  * based upon ascii character sequences.
                     28:  */
                     29: static u_char charmap[] = {
                     30:        '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
                     31:        '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
                     32:        '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
                     33:        '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
                     34:        '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
                     35:        '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
                     36:        '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
                     37:        '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
                     38:        '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
                     39:        '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
                     40:        '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
                     41:        '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
                     42:        '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
                     43:        '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
                     44:        '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
                     45:        '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
                     46:        '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
                     47:        '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
                     48:        '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
                     49:        '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
                     50:        '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
                     51:        '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
                     52:        '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
                     53:        '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
                     54:        '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
                     55:        '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
                     56:        '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
                     57:        '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
                     58:        '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
                     59:        '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
                     60:        '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
                     61:        '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
                     62: };
                     63: 
                     64: strcasecmp(s1, s2)
                     65:        char *s1, *s2;
                     66: {
                     67:        register u_char *cm = charmap,
                     68:                        *us1 = (u_char *)s1,
                     69:                        *us2 = (u_char *)s2;
                     70: 
                     71:        while (cm[*us1] == cm[*us2++])
                     72:                if (*us1++ == '\0')
                     73:                        return(0);
                     74:        return(cm[*us1] - cm[*--us2]);
                     75: }
                     76: 
                     77: strncasecmp(s1, s2, n)
                     78:        char *s1, *s2;
                     79:        register int n;
                     80: {
                     81:        register u_char *cm = charmap,
                     82:                        *us1 = (u_char *)s1,
                     83:                        *us2 = (u_char *)s2;
                     84: 
                     85:        while (--n >= 0 && cm[*us1] == cm[*us2++])
                     86:                if (*us1++ == '\0')
                     87:                        return(0);
                     88:        return(n < 0 ? 0 : cm[*us1] - cm[*--us2]);
                     89: }

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