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 | #if defined(LIBC_SCCS) && !defined(lint)
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14 | static char sccsid[] = "@(#)strcasecmp.c 5.5 (Berkeley) 11/24/87";
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15 | #endif /* LIBC_SCCS and not lint */
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16 |
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17 | /*
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18 | * This array is designed for mapping upper and lower case letter
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19 | * together for a case independent comparison. The mappings are
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20 | * based upon ascii character sequences.
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21 | */
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22 | static unsigned char charmap[] = {
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23 | '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
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24 | '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
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25 | '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
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26 | '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
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27 | '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
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28 | '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
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29 | '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
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30 | '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
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31 | '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
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32 | '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
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33 | '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
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34 | '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
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35 | '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
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36 | '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
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37 | '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
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38 | '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
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39 | '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
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40 | '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
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41 | '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
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42 | '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
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43 | '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
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44 | '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
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45 | '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
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46 | '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
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47 | '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
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48 | '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
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49 | '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
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50 | '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
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51 | '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
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52 | '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
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53 | '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
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54 | '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
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55 | };
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56 |
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57 | int
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58 | strcasecmp(s1, s2)
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59 | char *s1, *s2;
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60 | {
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61 | register unsigned char u1, u2;
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62 |
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63 | for (;;) {
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64 | u1 = (unsigned char) *s1++;
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65 | u2 = (unsigned char) *s2++;
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66 | if (charmap[u1] != charmap[u2]) {
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67 | return charmap[u1] - charmap[u2];
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68 | }
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69 | if (u1 == '\0') {
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70 | return 0;
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71 | }
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72 | }
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73 | }
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74 | int
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75 | strncasecmp(s1, s2, n)
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76 | char *s1, *s2;
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77 | int n;
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78 | {
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79 | register unsigned char u1, u2;
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80 | int i;
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81 | for (i=0;i<n;i++) {
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82 | u1 = (unsigned char) *s1++;
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83 | u2 = (unsigned char) *s2++;
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84 | if (charmap[u1] != charmap[u2]) {
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85 | return charmap[u1] - charmap[u2];
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86 | }
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87 | if (u1 == '\0') {
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88 | return 0;
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89 | }
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90 | }
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91 | return 0;
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92 | }
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93 |
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94 |
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95 |
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96 |
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