icuSources/common/uscript.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 **********************************************************************
   5 *   Copyright (C) 1997-2014, International Business Machines
   6 *   Corporation and others.  All Rights Reserved.
   7 **********************************************************************
   8 *
   9 * File USCRIPT.C
  10 *
  11 * Modification History:
  12 *
  13 *   Date        Name        Description
  14 *   07/06/2001    Ram         Creation.
  15 ******************************************************************************
  16 */
  17
  18 #include "unicode/uchar.h"
  19 #include "unicode/uscript.h"
  20 #include "unicode/uloc.h"
  21 #include "cmemory.h"
  22 #include "cstring.h"
  23
  24 static const UScriptCode JAPANESE[3] = { USCRIPT_KATAKANA, USCRIPT_HIRAGANA, USCRIPT_HAN };
  25 static const UScriptCode KOREAN[2] = { USCRIPT_HANGUL, USCRIPT_HAN };
  26 static const UScriptCode HAN_BOPO[2] = { USCRIPT_HAN, USCRIPT_BOPOMOFO };
  27
  28 static int32_t
  29 setCodes(const UScriptCode *src, int32_t length,
  30          UScriptCode *dest, int32_t capacity, UErrorCode *err) {
  31     int32_t i;
  32     if(U_FAILURE(*err)) { return 0; }
  33     if(length > capacity) {
  34         *err = U_BUFFER_OVERFLOW_ERROR;
  35         return length;
  36     }
  37     for(i = 0; i < length; ++i) {
  38         dest[i] = src[i];
  39     }
  40     return length;
  41 }
  42
  43 static int32_t
  44 setOneCode(UScriptCode script, UScriptCode *scripts, int32_t capacity, UErrorCode *err) {
  45     if(U_FAILURE(*err)) { return 0; }
  46     if(1 > capacity) {
  47         *err = U_BUFFER_OVERFLOW_ERROR;
  48         return 1;
  49     }
  50     scripts[0] = script;
  51     return 1;
  52 }
  53
  54 static int32_t
  55 getCodesFromLocale(const char *locale,
  56                    UScriptCode *scripts, int32_t capacity, UErrorCode *err) {
  57     UErrorCode internalErrorCode = U_ZERO_ERROR;
  58     char lang[8];
  59     char script[8];
  60     int32_t scriptLength;
  61     if(U_FAILURE(*err)) { return 0; }
  62     // Multi-script languages, equivalent to the LocaleScript data
  63     // that we used to load from locale resource bundles.
  64     /*length = */ uloc_getLanguage(locale, lang, UPRV_LENGTHOF(lang), &internalErrorCode);
  65     if(U_FAILURE(internalErrorCode) || internalErrorCode == U_STRING_NOT_TERMINATED_WARNING) {
  66         return 0;
  67     }
  68     if(0 == uprv_strcmp(lang, "ja")) {
  69         return setCodes(JAPANESE, UPRV_LENGTHOF(JAPANESE), scripts, capacity, err);
  70     }
  71     if(0 == uprv_strcmp(lang, "ko")) {
  72         return setCodes(KOREAN, UPRV_LENGTHOF(KOREAN), scripts, capacity, err);
  73     }
  74     scriptLength = uloc_getScript(locale, script, UPRV_LENGTHOF(script), &internalErrorCode);
  75     if(U_FAILURE(internalErrorCode) || internalErrorCode == U_STRING_NOT_TERMINATED_WARNING) {
  76         return 0;
  77     }
  78     if(0 == uprv_strcmp(lang, "zh") && 0 == uprv_strcmp(script, "Hant")) {
  79         return setCodes(HAN_BOPO, UPRV_LENGTHOF(HAN_BOPO), scripts, capacity, err);
  80     }
  81     // Explicit script code.
  82     if(scriptLength != 0) {
  83         UScriptCode scriptCode = (UScriptCode)u_getPropertyValueEnum(UCHAR_SCRIPT, script);
  84         if(scriptCode != USCRIPT_INVALID_CODE) {
  85             if(scriptCode == USCRIPT_SIMPLIFIED_HAN || scriptCode == USCRIPT_TRADITIONAL_HAN) {
  86                 scriptCode = USCRIPT_HAN;
  87             }
  88             return setOneCode(scriptCode, scripts, capacity, err);
  89         }
  90     }
  91     return 0;
  92 }
  93
  94 /* TODO: this is a bad API and should be deprecated, ticket #11141 */
  95 U_CAPI int32_t  U_EXPORT2
  96 uscript_getCode(const char* nameOrAbbrOrLocale,
  97                 UScriptCode* fillIn,
  98                 int32_t capacity,
  99                 UErrorCode* err){
 100     UBool triedCode;
 101     char likely[ULOC_FULLNAME_CAPACITY];
 102     UErrorCode internalErrorCode;
 103     int32_t length;
 104
 105     if(U_FAILURE(*err)) {
 106         return 0;
 107     }
 108     if(nameOrAbbrOrLocale==NULL ||
 109             (fillIn == NULL ? capacity != 0 : capacity < 0)) {
 110         *err = U_ILLEGAL_ARGUMENT_ERROR;
 111         return 0;
 112     }
 113
 114     triedCode = FALSE;
 115     if(uprv_strchr(nameOrAbbrOrLocale, '-')==NULL && uprv_strchr(nameOrAbbrOrLocale, '_')==NULL ){
 116         /* try long and abbreviated script names first */
 117         UScriptCode code = (UScriptCode) u_getPropertyValueEnum(UCHAR_SCRIPT, nameOrAbbrOrLocale);
 118         if(code!=USCRIPT_INVALID_CODE) {
 119             return setOneCode(code, fillIn, capacity, err);
 120         }
 121         triedCode = TRUE;
 122     }
 123     internalErrorCode = U_ZERO_ERROR;
 124     length = getCodesFromLocale(nameOrAbbrOrLocale, fillIn, capacity, err);
 125     if(U_FAILURE(*err) || length != 0) {
 126         return length;
 127     }
 128     (void)uloc_addLikelySubtags(nameOrAbbrOrLocale,
 129                                 likely, UPRV_LENGTHOF(likely), &internalErrorCode);
 130     if(U_SUCCESS(internalErrorCode) && internalErrorCode != U_STRING_NOT_TERMINATED_WARNING) {
 131         length = getCodesFromLocale(likely, fillIn, capacity, err);
 132         if(U_FAILURE(*err) || length != 0) {
 133             return length;
 134         }
 135     }
 136     if(!triedCode) {
 137         /* still not found .. try long and abbreviated script names again */
 138         UScriptCode code = (UScriptCode) u_getPropertyValueEnum(UCHAR_SCRIPT, nameOrAbbrOrLocale);
 139         if(code!=USCRIPT_INVALID_CODE) {
 140             return setOneCode(code, fillIn, capacity, err);
 141         }
 142     }
 143     return 0;
 144 }