2.11BSD#431 - /usr/src/libexec/tcpd/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: /* Some environments don't define u_char -- WZV */
  23: #if 0
  24: #include <sys/types.h>
  25: #else
  26: typedef unsigned char u_char;
  27: #endif
  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 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', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
  60:     '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
  61:     '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
  62:     '\370', '\371', '\372', '\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: strcasecmp(s1, s2)
  70:     char *s1, *s2;
  71: {
  72:     register u_char *cm = charmap,
  73:             *us1 = (u_char *)s1,
  74:             *us2 = (u_char *)s2;
  75: 
  76:     while (cm[*us1] == cm[*us2++])
  77:         if (*us1++ == '\0')
  78:             return(0);
  79:     return(cm[*us1] - cm[*--us2]);
  80: }
  81: 
  82: strncasecmp(s1, s2, n)
  83:     char *s1, *s2;
  84:     register int n;
  85: {
  86:     register u_char *cm = charmap,
  87:             *us1 = (u_char *)s1,
  88:             *us2 = (u_char *)s2;
  89: 
  90:     while (--n >= 0 && cm[*us1] == cm[*us2++])
  91:         if (*us1++ == '\0')
  92:             return(0);
  93:     return(n < 0 ? 0 : cm[*us1] - cm[*--us2]);
  94: }

Defined functions

Defined variables