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
ustrcase_setTempCaseMapLocale(UCaseMap * csm,const char * locale)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
setTempCaseMap(UCaseMap * csm,const char * locale)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
u_strToLower(UChar * dest,int32_t destCapacity,const UChar * src,int32_t srcLength,const char * locale,UErrorCode * pErrorCode)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
u_strToUpper(UChar * dest,int32_t destCapacity,const UChar * src,int32_t srcLength,const char * locale,UErrorCode * pErrorCode)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