1 /* 2 ******************************************************************************* 3 * Copyright (C) 2011, International Business Machines 4 * Corporation and others. All Rights Reserved. 5 ******************************************************************************* 6 * file name: ustrcase_locale.cpp 7 * encoding: US-ASCII 8 * tab size: 8 (not used) 9 * indentation:4 10 * 11 * created on: 2011may31 12 * created by: Markus W. Scherer 13 * 14 * Locale-sensitive case mapping functions (ones that call uloc_getDefault()) 15 * were moved here to break dependency cycles among parts of the common library. 16 */ 17 18 #include "unicode/utypes.h" 19 #include "unicode/ucasemap.h" 20 #include "unicode/uloc.h" 21 #include "unicode/ustring.h" 22 #include "ucase.h" 23 #include "ustr_imp.h" 24 25 U_CFUNC void 26 ustrcase_setTempCaseMapLocale(UCaseMap *csm, const char *locale) { 27 /* 28 * We could call ucasemap_setLocale(), but here we really only care about 29 * the initial language subtag, we need not return the real string via 30 * ucasemap_getLocale(), and we don't care about only getting "x" from 31 * "x-some-thing" etc. 32 * 33 * We ignore locales with a longer-than-3 initial subtag. 34 * 35 * We also do not fill in the locCache because it is rarely used, 36 * and not worth setting unless we reuse it for many case mapping operations. 37 * (That's why UCaseMap was created.) 38 */ 39 int i; 40 char c; 41 42 /* the internal functions require locale!=NULL */ 43 if(locale==NULL) { 44 // Do not call uprv_getDefaultLocaleID() because that does not see 45 // changes to the default locale via uloc_setDefault(). 46 // It would also be inefficient if used frequently because uprv_getDefaultLocaleID() 47 // does not cache the locale ID. 48 // 49 // Unfortunately, uloc_getDefault() has many dependencies. 50 // We only care about a small set of language subtags, 51 // and we do not need the locale ID to be canonicalized. 52 // 53 // Best is to not call case mapping functions with a NULL locale ID. 54 locale=uloc_getDefault(); 55 } 56 for(i=0; i<4 && (c=locale[i])!=0 && c!='-' && c!='_'; ++i) { 57 csm->locale[i]=c; 58 } 59 if(i<=3) { 60 csm->locale[i]=0; /* Up to 3 non-separator characters. */ 61 } else { 62 csm->locale[0]=0; /* Longer-than-3 initial subtag: Ignore. */ 63 } 64 } 65 66 /* 67 * Set parameters on an empty UCaseMap, for UCaseMap-less API functions. 68 * Do this fast because it is called with every function call. 69 */ 70 static inline void 71 setTempCaseMap(UCaseMap *csm, const char *locale) { 72 if(csm->csp==NULL) { 73 csm->csp=ucase_getSingleton(); 74 } 75 if(locale!=NULL && locale[0]==0) { 76 csm->locale[0]=0; 77 } else { 78 ustrcase_setTempCaseMapLocale(csm, locale); 79 } 80 } 81 82 /* public API functions */ 83 84 U_CAPI int32_t U_EXPORT2 85 u_strToLower(UChar *dest, int32_t destCapacity, 86 const UChar *src, int32_t srcLength, 87 const char *locale, 88 UErrorCode *pErrorCode) { 89 UCaseMap csm=UCASEMAP_INITIALIZER; 90 setTempCaseMap(&csm, locale); 91 return ustrcase_map( 92 &csm, 93 dest, destCapacity, 94 src, srcLength, 95 ustrcase_internalToLower, pErrorCode); 96 } 97 98 U_CAPI int32_t U_EXPORT2 99 u_strToUpper(UChar *dest, int32_t destCapacity, 100 const UChar *src, int32_t srcLength, 101 const char *locale, 102 UErrorCode *pErrorCode) { 103 UCaseMap csm=UCASEMAP_INITIALIZER; 104 setTempCaseMap(&csm, locale); 105 return ustrcase_map( 106 &csm, 107 dest, destCapacity, 108 src, srcLength, 109 ustrcase_internalToUpper, pErrorCode); 110 } 111
