release/src/router/apcupsd/src/lib/strcasecmp.c

   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 #if defined(QNX)
  23 #include <sys/types.h>
  24 #else
  25
  26 #ifndef u_char
  27 typedef unsigned char u_char;
  28 #endif
  29
  30 #endif
  31
  32 /*
  33  * This array is designed for mapping upper and lower case letter
  34  * together for a case independent comparison.  The mappings are
  35  * based upon ascii character sequences.
  36  */
  37 static u_char charmap[] = {
  38         '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
  39         '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
  40         '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
  41         '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
  42         '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
  43         '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
  44         '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
  45         '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
  46         '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
  47         '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
  48         '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
  49         '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
  50         '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
  51         '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
  52         '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
  53         '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
  54         '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
  55         '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
  56         '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
  57         '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
  58         '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
  59         '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
  60         '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
  61         '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
  62         '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
  63         '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
  64         '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
  65         '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
  66         '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
  67         '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
  68         '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
  69         '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
  70 };
  71
  72 strcasecmp(s1, s2)
  73         char *s1, *s2;
  74 {
  75         register u_char *cm = charmap,
  76                         *us1 = (u_char *)s1,
  77                         *us2 = (u_char *)s2;
  78
  79         while (cm[*us1] == cm[*us2++])
  80                 if (*us1++ == '\0')
  81                         return(0);
  82         return(cm[*us1] - cm[*--us2]);
  83 }
  84
  85 strncasecmp(s1, s2, n)
  86         char *s1, *s2;
  87         register int n;
  88 {
  89         register u_char *cm = charmap,
  90                         *us1 = (u_char *)s1,
  91                         *us2 = (u_char *)s2;
  92
  93         while (--n >= 0 && cm[*us1] == cm[*us2++])
  94                 if (*us1++ == '\0')
  95                         return(0);
  96         return(n < 0 ? 0 : cm[*us1] - cm[*--us2]);
  97 }