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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 strcasecmp (const char *@var{s1}, const char *@var{s2})
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16
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17 A case-insensitive @code{strcmp}.
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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 typedef unsigned char uc;
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36 static const unsigned char charmap[] = {
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37 (uc)'\000',(uc)'\001',(uc)'\002',(uc)'\003',(uc)'\004',(uc)'\005',(uc)'\006',(uc)'\007',
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38 (uc)'\010',(uc)'\011',(uc)'\012',(uc)'\013',(uc)'\014',(uc)'\015',(uc)'\016',(uc)'\017',
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39 (uc)'\020',(uc)'\021',(uc)'\022',(uc)'\023',(uc)'\024',(uc)'\025',(uc)'\026',(uc)'\027',
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40 (uc)'\030',(uc)'\031',(uc)'\032',(uc)'\033',(uc)'\034',(uc)'\035',(uc)'\036',(uc)'\037',
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41 (uc)'\040',(uc)'\041',(uc)'\042',(uc)'\043',(uc)'\044',(uc)'\045',(uc)'\046',(uc)'\047',
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42 (uc)'\050',(uc)'\051',(uc)'\052',(uc)'\053',(uc)'\054',(uc)'\055',(uc)'\056',(uc)'\057',
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43 (uc)'\060',(uc)'\061',(uc)'\062',(uc)'\063',(uc)'\064',(uc)'\065',(uc)'\066',(uc)'\067',
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44 (uc)'\070',(uc)'\071',(uc)'\072',(uc)'\073',(uc)'\074',(uc)'\075',(uc)'\076',(uc)'\077',
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45 (uc)'\100',(uc)'\141',(uc)'\142',(uc)'\143',(uc)'\144',(uc)'\145',(uc)'\146',(uc)'\147',
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46 (uc)'\150',(uc)'\151',(uc)'\152',(uc)'\153',(uc)'\154',(uc)'\155',(uc)'\156',(uc)'\157',
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47 (uc)'\160',(uc)'\161',(uc)'\162',(uc)'\163',(uc)'\164',(uc)'\165',(uc)'\166',(uc)'\167',
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48 (uc)'\170',(uc)'\171',(uc)'\172',(uc)'\133',(uc)'\134',(uc)'\135',(uc)'\136',(uc)'\137',
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49 (uc)'\140',(uc)'\141',(uc)'\142',(uc)'\143',(uc)'\144',(uc)'\145',(uc)'\146',(uc)'\147',
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50 (uc)'\150',(uc)'\151',(uc)'\152',(uc)'\153',(uc)'\154',(uc)'\155',(uc)'\156',(uc)'\157',
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51 (uc)'\160',(uc)'\161',(uc)'\162',(uc)'\163',(uc)'\164',(uc)'\165',(uc)'\166',(uc)'\167',
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52 (uc)'\170',(uc)'\171',(uc)'\172',(uc)'\173',(uc)'\174',(uc)'\175',(uc)'\176',(uc)'\177',
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53 (uc)'\200',(uc)'\201',(uc)'\202',(uc)'\203',(uc)'\204',(uc)'\205',(uc)'\206',(uc)'\207',
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54 (uc)'\210',(uc)'\211',(uc)'\212',(uc)'\213',(uc)'\214',(uc)'\215',(uc)'\216',(uc)'\217',
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55 (uc)'\220',(uc)'\221',(uc)'\222',(uc)'\223',(uc)'\224',(uc)'\225',(uc)'\226',(uc)'\227',
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56 (uc)'\230',(uc)'\231',(uc)'\232',(uc)'\233',(uc)'\234',(uc)'\235',(uc)'\236',(uc)'\237',
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57 (uc)'\240',(uc)'\241',(uc)'\242',(uc)'\243',(uc)'\244',(uc)'\245',(uc)'\246',(uc)'\247',
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58 (uc)'\250',(uc)'\251',(uc)'\252',(uc)'\253',(uc)'\254',(uc)'\255',(uc)'\256',(uc)'\257',
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59 (uc)'\260',(uc)'\261',(uc)'\262',(uc)'\263',(uc)'\264',(uc)'\265',(uc)'\266',(uc)'\267',
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60 (uc)'\270',(uc)'\271',(uc)'\272',(uc)'\273',(uc)'\274',(uc)'\275',(uc)'\276',(uc)'\277',
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61 (uc)'\300',(uc)'\341',(uc)'\342',(uc)'\343',(uc)'\344',(uc)'\345',(uc)'\346',(uc)'\347',
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62 (uc)'\350',(uc)'\351',(uc)'\352',(uc)'\353',(uc)'\354',(uc)'\355',(uc)'\356',(uc)'\357',
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63 (uc)'\360',(uc)'\361',(uc)'\362',(uc)'\363',(uc)'\364',(uc)'\365',(uc)'\366',(uc)'\367',
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64 (uc)'\370',(uc)'\371',(uc)'\372',(uc)'\333',(uc)'\334',(uc)'\335',(uc)'\336',(uc)'\337',
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65 (uc)'\340',(uc)'\341',(uc)'\342',(uc)'\343',(uc)'\344',(uc)'\345',(uc)'\346',(uc)'\347',
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66 (uc)'\350',(uc)'\351',(uc)'\352',(uc)'\353',(uc)'\354',(uc)'\355',(uc)'\356',(uc)'\357',
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67 (uc)'\360',(uc)'\361',(uc)'\362',(uc)'\363',(uc)'\364',(uc)'\365',(uc)'\366',(uc)'\367',
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68 (uc)'\370',(uc)'\371',(uc)'\372',(uc)'\373',(uc)'\374',(uc)'\375',(uc)'\376',(uc)'\377',
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69 };
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70
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71 int
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72 strcasecmp(const char *s1, const char *s2)
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73 {
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74 register unsigned char u1, u2;
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75
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76 for (;;) {
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77 u1 = (unsigned char) *s1++;
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78 u2 = (unsigned char) *s2++;
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79 if (charmap[u1] != charmap[u2]) {
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80 return charmap[u1] - charmap[u2];
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81 }
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82 if (u1 == '\0') {
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83 return 0;
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84 }
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85 }
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86 }
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87
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