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1 /*
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2 * Copyright (c) 1987 Regents of the University of California.
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3 * All rights reserved.
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4 *
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5 * Redistribution and use in source and binary forms are permitted
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6 * provided that this notice is preserved and that due credit is given
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7 * to the University of California at Berkeley. The name of the University
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8 * may not be used to endorse or promote products derived from this
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9 * software without specific written prior permission. This software
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10 * is provided ``as is'' without express or implied warranty.
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11 */
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12
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13 /*
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14
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15 @deftypefn Supplemental int strncasecmp (const char *@var{s1}, const char *@var{s2})
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16
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17 A case-insensitive @code{strncmp}.
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18
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19 @end deftypefn
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20
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21 */
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22
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23 #if defined(LIBC_SCCS) && !defined(lint)
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24 static char sccsid[] = "@(#)strcasecmp.c 5.5 (Berkeley) 11/24/87";
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25 #endif /* LIBC_SCCS and not lint */
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26
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27 #include <ansidecl.h>
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28 #include <stddef.h>
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29
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30 /*
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31 * This array is designed for mapping upper and lower case letter
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32 * together for a case independent comparison. The mappings are
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33 * based upon ascii character sequences.
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34 */
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35 static const unsigned char charmap[] = {
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36 '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
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37 '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
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38 '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
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39 '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
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40 '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
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41 '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
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42 '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
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43 '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
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44 '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
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45 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
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46 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
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47 '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
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48 '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
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49 '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
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50 '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
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51 '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
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52 '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
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53 '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
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54 '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
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55 '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
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56 '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
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57 '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
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58 '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
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59 '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
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60 '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
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61 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
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62 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
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63 '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
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64 '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
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65 '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
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66 '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
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67 '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
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68 };
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69
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70 int
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71 strncasecmp(const char *s1, const char *s2, register size_t n)
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72 {
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73 register unsigned char u1, u2;
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74
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75 for (; n != 0; --n) {
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76 u1 = (unsigned char) *s1++;
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77 u2 = (unsigned char) *s2++;
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78 if (charmap[u1] != charmap[u2]) {
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79 return charmap[u1] - charmap[u2];
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80 }
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81 if (u1 == '\0') {
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82 return 0;
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83 }
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84 }
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85 return 0;
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86 }
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