/*
*******************************************************************************
*
* Copyright (C) 1997-2014, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: loclikely.cpp
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2010feb25
* created by: Markus W. Scherer
*
* Code for likely and minimized locale subtags, separated out from other .cpp files
* that then do not depend on resource bundle code and likely-subtags data.
*/
#include "unicode/utypes.h"
#include "unicode/locid.h"
#include "unicode/putil.h"
#include "unicode/uloc.h"
#include "unicode/ures.h"
#include "unicode/uscript.h"
#include "cmemory.h"
#include "cstring.h"
#include "ulocimp.h"
#include "ustr_imp.h"
/**
* This function looks for the localeID in the likelySubtags resource.
*
* @param localeID The tag to find.
* @param buffer A buffer to hold the matching entry
* @param bufferLength The length of the output buffer
* @return A pointer to "buffer" if found, or a null pointer if not.
*/
static const char* U_CALLCONV
findLikelySubtags(const char* localeID,
char* buffer,
int32_t bufferLength,
UErrorCode* err) {
const char* result = NULL;
if (!U_FAILURE(*err)) {
int32_t resLen = 0;
const UChar* s = NULL;
UErrorCode tmpErr = U_ZERO_ERROR;
UResourceBundle* subtags = ures_openDirect(NULL, "likelySubtags", &tmpErr);
if (U_SUCCESS(tmpErr)) {
s = ures_getStringByKey(subtags, localeID, &resLen, &tmpErr);
if (U_FAILURE(tmpErr)) {
/*
* If a resource is missing, it's not really an error, it's
* just that we don't have any data for that particular locale ID.
*/
if (tmpErr != U_MISSING_RESOURCE_ERROR) {
*err = tmpErr;
}
}
else if (resLen >= bufferLength) {
/* The buffer should never overflow. */
*err = U_INTERNAL_PROGRAM_ERROR;
}
else {
u_UCharsToChars(s, buffer, resLen + 1);
result = buffer;
}
ures_close(subtags);
} else {
*err = tmpErr;
}
}
return result;
}
/**
* Append a tag to a buffer, adding the separator if necessary. The buffer
* must be large enough to contain the resulting tag plus any separator
* necessary. The tag must not be a zero-length string.
*
* @param tag The tag to add.
* @param tagLength The length of the tag.
* @param buffer The output buffer.
* @param bufferLength The length of the output buffer. This is an input/ouput parameter.
**/
static void U_CALLCONV
appendTag(
const char* tag,
int32_t tagLength,
char* buffer,
int32_t* bufferLength) {
if (*bufferLength > 0) {
buffer[*bufferLength] = '_';
++(*bufferLength);
}
uprv_memmove(
&buffer[*bufferLength],
tag,
tagLength);
*bufferLength += tagLength;
}
/**
* These are the canonical strings for unknown languages, scripts and regions.
**/
static const char* const unknownLanguage = "und";
static const char* const unknownScript = "Zzzz";
static const char* const unknownRegion = "ZZ";
/**
* Create a tag string from the supplied parameters. The lang, script and region
* parameters may be NULL pointers. If they are, their corresponding length parameters
* must be less than or equal to 0.
*
* If any of the language, script or region parameters are empty, and the alternateTags
* parameter is not NULL, it will be parsed for potential language, script and region tags
* to be used when constructing the new tag. If the alternateTags parameter is NULL, or
* it contains no language tag, the default tag for the unknown language is used.
*
* If the length of the new string exceeds the capacity of the output buffer,
* the function copies as many bytes to the output buffer as it can, and returns
* the error U_BUFFER_OVERFLOW_ERROR.
*
* If an illegal argument is provided, the function returns the error
* U_ILLEGAL_ARGUMENT_ERROR.
*
* Note that this function can return the warning U_STRING_NOT_TERMINATED_WARNING if
* the tag string fits in the output buffer, but the null terminator doesn't.
*
* @param lang The language tag to use.
* @param langLength The length of the language tag.
* @param script The script tag to use.
* @param scriptLength The length of the script tag.
* @param region The region tag to use.
* @param regionLength The length of the region tag.
* @param trailing Any trailing data to append to the new tag.
* @param trailingLength The length of the trailing data.
* @param alternateTags A string containing any alternate tags.
* @param tag The output buffer.
* @param tagCapacity The capacity of the output buffer.
* @param err A pointer to a UErrorCode for error reporting.
* @return The length of the tag string, which may be greater than tagCapacity, or -1 on error.
**/
static int32_t U_CALLCONV
createTagStringWithAlternates(
const char* lang,
int32_t langLength,
const char* script,
int32_t scriptLength,
const char* region,
int32_t regionLength,
const char* trailing,
int32_t trailingLength,
const char* alternateTags,
char* tag,
int32_t tagCapacity,
UErrorCode* err) {
if (U_FAILURE(*err)) {
goto error;
}
else if (tag == NULL ||
tagCapacity <= 0 ||
langLength >= ULOC_LANG_CAPACITY ||
scriptLength >= ULOC_SCRIPT_CAPACITY ||
regionLength >= ULOC_COUNTRY_CAPACITY) {
goto error;
}
else {
/**
* ULOC_FULLNAME_CAPACITY will provide enough capacity
* that we can build a string that contains the language,
* script and region code without worrying about overrunning
* the user-supplied buffer.
**/
char tagBuffer[ULOC_FULLNAME_CAPACITY];
int32_t tagLength = 0;
int32_t capacityRemaining = tagCapacity;
UBool regionAppended = FALSE;
if (langLength > 0) {
appendTag(
lang,
langLength,
tagBuffer,
&tagLength);
}
else if (alternateTags == NULL) {
/*
* Append the value for an unknown language, if
* we found no language.
*/
appendTag(
unknownLanguage,
(int32_t)uprv_strlen(unknownLanguage),
tagBuffer,
&tagLength);
}
else {
/*
* Parse the alternateTags string for the language.
*/
char alternateLang[ULOC_LANG_CAPACITY];
int32_t alternateLangLength = sizeof(alternateLang);
alternateLangLength =
uloc_getLanguage(
alternateTags,
alternateLang,
alternateLangLength,
err);
if(U_FAILURE(*err) ||
alternateLangLength >= ULOC_LANG_CAPACITY) {
goto error;
}
else if (alternateLangLength == 0) {
/*
* Append the value for an unknown language, if
* we found no language.
*/
appendTag(
unknownLanguage,
(int32_t)uprv_strlen(unknownLanguage),
tagBuffer,
&tagLength);
}
else {
appendTag(
alternateLang,
alternateLangLength,
tagBuffer,
&tagLength);
}
}
if (scriptLength > 0) {
appendTag(
script,
scriptLength,
tagBuffer,
&tagLength);
}
else if (alternateTags != NULL) {
/*
* Parse the alternateTags string for the script.
*/
char alternateScript[ULOC_SCRIPT_CAPACITY];
const int32_t alternateScriptLength =
uloc_getScript(
alternateTags,
alternateScript,
sizeof(alternateScript),
err);
if (U_FAILURE(*err) ||
alternateScriptLength >= ULOC_SCRIPT_CAPACITY) {
goto error;
}
else if (alternateScriptLength > 0) {
appendTag(
alternateScript,
alternateScriptLength,
tagBuffer,
&tagLength);
}
}
if (regionLength > 0) {
appendTag(
region,
regionLength,
tagBuffer,
&tagLength);
regionAppended = TRUE;
}
else if (alternateTags != NULL) {
/*
* Parse the alternateTags string for the region.
*/
char alternateRegion[ULOC_COUNTRY_CAPACITY];
const int32_t alternateRegionLength =
uloc_getCountry(
alternateTags,
alternateRegion,
sizeof(alternateRegion),
err);
if (U_FAILURE(*err) ||
alternateRegionLength >= ULOC_COUNTRY_CAPACITY) {
goto error;
}
else if (alternateRegionLength > 0) {
appendTag(
alternateRegion,
alternateRegionLength,
tagBuffer,
&tagLength);
regionAppended = TRUE;
}
}
{
const int32_t toCopy =
tagLength >= tagCapacity ? tagCapacity : tagLength;
/**
* Copy the partial tag from our internal buffer to the supplied
* target.
**/
uprv_memcpy(
tag,
tagBuffer,
toCopy);
capacityRemaining -= toCopy;
}
if (trailingLength > 0) {
if (*trailing != '@' && capacityRemaining > 0) {
tag[tagLength++] = '_';
--capacityRemaining;
if (capacityRemaining > 0 && !regionAppended) {
/* extra separator is required */
tag[tagLength++] = '_';
--capacityRemaining;
}
}
if (capacityRemaining > 0) {
/*
* Copy the trailing data into the supplied buffer. Use uprv_memmove, since we
* don't know if the user-supplied buffers overlap.
*/
const int32_t toCopy =
trailingLength >= capacityRemaining ? capacityRemaining : trailingLength;
uprv_memmove(
&tag[tagLength],
trailing,
toCopy);
}
}
tagLength += trailingLength;
return u_terminateChars(
tag,
tagCapacity,
tagLength,
err);
}
error:
/**
* An overflow indicates the locale ID passed in
* is ill-formed. If we got here, and there was
* no previous error, it's an implicit overflow.
**/
if (*err == U_BUFFER_OVERFLOW_ERROR ||
U_SUCCESS(*err)) {
*err = U_ILLEGAL_ARGUMENT_ERROR;
}
return -1;
}
/**
* Create a tag string from the supplied parameters. The lang, script and region
* parameters may be NULL pointers. If they are, their corresponding length parameters
* must be less than or equal to 0. If the lang parameter is an empty string, the
* default value for an unknown language is written to the output buffer.
*
* If the length of the new string exceeds the capacity of the output buffer,
* the function copies as many bytes to the output buffer as it can, and returns
* the error U_BUFFER_OVERFLOW_ERROR.
*
* If an illegal argument is provided, the function returns the error
* U_ILLEGAL_ARGUMENT_ERROR.
*
* @param lang The language tag to use.
* @param langLength The length of the language tag.
* @param script The script tag to use.
* @param scriptLength The length of the script tag.
* @param region The region tag to use.
* @param regionLength The length of the region tag.
* @param trailing Any trailing data to append to the new tag.
* @param trailingLength The length of the trailing data.
* @param tag The output buffer.
* @param tagCapacity The capacity of the output buffer.
* @param err A pointer to a UErrorCode for error reporting.
* @return The length of the tag string, which may be greater than tagCapacity.
**/
static int32_t U_CALLCONV
createTagString(
const char* lang,
int32_t langLength,
const char* script,
int32_t scriptLength,
const char* region,
int32_t regionLength,
const char* trailing,
int32_t trailingLength,
char* tag,
int32_t tagCapacity,
UErrorCode* err)
{
return createTagStringWithAlternates(
lang,
langLength,
script,
scriptLength,
region,
regionLength,
trailing,
trailingLength,
NULL,
tag,
tagCapacity,
err);
}
/**
* Parse the language, script, and region subtags from a tag string, and copy the
* results into the corresponding output parameters. The buffers are null-terminated,
* unless overflow occurs.
*
* The langLength, scriptLength, and regionLength parameters are input/output
* parameters, and must contain the capacity of their corresponding buffers on
* input. On output, they will contain the actual length of the buffers, not
* including the null terminator.
*
* If the length of any of the output subtags exceeds the capacity of the corresponding
* buffer, the function copies as many bytes to the output buffer as it can, and returns
* the error U_BUFFER_OVERFLOW_ERROR. It will not parse any more subtags once overflow
* occurs.
*
* If an illegal argument is provided, the function returns the error
* U_ILLEGAL_ARGUMENT_ERROR.
*
* @param localeID The locale ID to parse.
* @param lang The language tag buffer.
* @param langLength The length of the language tag.
* @param script The script tag buffer.
* @param scriptLength The length of the script tag.
* @param region The region tag buffer.
* @param regionLength The length of the region tag.
* @param err A pointer to a UErrorCode for error reporting.
* @return The number of chars of the localeID parameter consumed.
**/
static int32_t U_CALLCONV
parseTagString(
const char* localeID,
char* lang,
int32_t* langLength,
char* script,
int32_t* scriptLength,
char* region,
int32_t* regionLength,
UErrorCode* err)
{
const char* position = localeID;
int32_t subtagLength = 0;
if(U_FAILURE(*err) ||
localeID == NULL ||
lang == NULL ||
langLength == NULL ||
script == NULL ||
scriptLength == NULL ||
region == NULL ||
regionLength == NULL) {
goto error;
}
subtagLength = ulocimp_getLanguage(position, lang, *langLength, &position);
u_terminateChars(lang, *langLength, subtagLength, err);
/*
* Note that we explicit consider U_STRING_NOT_TERMINATED_WARNING
* to be an error, because it indicates the user-supplied tag is
* not well-formed.
*/
if(U_FAILURE(*err)) {
goto error;
}
*langLength = subtagLength;
/*
* If no language was present, use the value of unknownLanguage
* instead. Otherwise, move past any separator.
*/
if (*langLength == 0) {
uprv_strcpy(
lang,
unknownLanguage);
*langLength = (int32_t)uprv_strlen(lang);
}
else if (_isIDSeparator(*position)) {
++position;
}
subtagLength = ulocimp_getScript(position, script, *scriptLength, &position);
u_terminateChars(script, *scriptLength, subtagLength, err);
if(U_FAILURE(*err)) {
goto error;
}
*scriptLength = subtagLength;
if (*scriptLength > 0) {
if (uprv_strnicmp(script, unknownScript, *scriptLength) == 0) {
/**
* If the script part is the "unknown" script, then don't return it.
**/
*scriptLength = 0;
}
/*
* Move past any separator.
*/
if (_isIDSeparator(*position)) {
++position;
}
}
subtagLength = ulocimp_getCountry(position, region, *regionLength, &position);
u_terminateChars(region, *regionLength, subtagLength, err);
if(U_FAILURE(*err)) {
goto error;
}
*regionLength = subtagLength;
if (*regionLength > 0) {
if (uprv_strnicmp(region, unknownRegion, *regionLength) == 0) {
/**
* If the region part is the "unknown" region, then don't return it.
**/
*regionLength = 0;
}
} else if (*position != 0 && *position != '@') {
/* back up over consumed trailing separator */
--position;
}
exit:
return (int32_t)(position - localeID);
error:
/**
* If we get here, we have no explicit error, it's the result of an
* illegal argument.
**/
if (!U_FAILURE(*err)) {
*err = U_ILLEGAL_ARGUMENT_ERROR;
}
goto exit;
}
static int32_t U_CALLCONV
createLikelySubtagsString(
const char* lang,
int32_t langLength,
const char* script,
int32_t scriptLength,
const char* region,
int32_t regionLength,
const char* variants,
int32_t variantsLength,
char* tag,
int32_t tagCapacity,
UErrorCode* err)
{
/**
* ULOC_FULLNAME_CAPACITY will provide enough capacity
* that we can build a string that contains the language,
* script and region code without worrying about overrunning
* the user-supplied buffer.
**/
char tagBuffer[ULOC_FULLNAME_CAPACITY];
char likelySubtagsBuffer[ULOC_FULLNAME_CAPACITY];
if(U_FAILURE(*err)) {
goto error;
}
/**
* Try the language with the script and region first.
**/
if (scriptLength > 0 && regionLength > 0) {
const char* likelySubtags = NULL;
createTagString(
lang,
langLength,
script,
scriptLength,
region,
regionLength,
NULL,
0,
tagBuffer,
sizeof(tagBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
likelySubtags =
findLikelySubtags(
tagBuffer,
likelySubtagsBuffer,
sizeof(likelySubtagsBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
if (likelySubtags != NULL) {
/* Always use the language tag from the
maximal string, since it may be more
specific than the one provided. */
return createTagStringWithAlternates(
NULL,
0,
NULL,
0,
NULL,
0,
variants,
variantsLength,
likelySubtags,
tag,
tagCapacity,
err);
}
}
/**
* Try the language with just the script.
**/
if (scriptLength > 0) {
const char* likelySubtags = NULL;
createTagString(
lang,
langLength,
script,
scriptLength,
NULL,
0,
NULL,
0,
tagBuffer,
sizeof(tagBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
likelySubtags =
findLikelySubtags(
tagBuffer,
likelySubtagsBuffer,
sizeof(likelySubtagsBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
if (likelySubtags != NULL) {
/* Always use the language tag from the
maximal string, since it may be more
specific than the one provided. */
return createTagStringWithAlternates(
NULL,
0,
NULL,
0,
region,
regionLength,
variants,
variantsLength,
likelySubtags,
tag,
tagCapacity,
err);
}
}
/**
* Try the language with just the region.
**/
if (regionLength > 0) {
const char* likelySubtags = NULL;
createTagString(
lang,
langLength,
NULL,
0,
region,
regionLength,
NULL,
0,
tagBuffer,
sizeof(tagBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
likelySubtags =
findLikelySubtags(
tagBuffer,
likelySubtagsBuffer,
sizeof(likelySubtagsBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
if (likelySubtags != NULL) {
/* Always use the language tag from the
maximal string, since it may be more
specific than the one provided. */
return createTagStringWithAlternates(
NULL,
0,
script,
scriptLength,
NULL,
0,
variants,
variantsLength,
likelySubtags,
tag,
tagCapacity,
err);
}
}
/**
* Finally, try just the language.
**/
{
const char* likelySubtags = NULL;
createTagString(
lang,
langLength,
NULL,
0,
NULL,
0,
NULL,
0,
tagBuffer,
sizeof(tagBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
likelySubtags =
findLikelySubtags(
tagBuffer,
likelySubtagsBuffer,
sizeof(likelySubtagsBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
if (likelySubtags != NULL) {
/* Always use the language tag from the
maximal string, since it may be more
specific than the one provided. */
return createTagStringWithAlternates(
NULL,
0,
script,
scriptLength,
region,
regionLength,
variants,
variantsLength,
likelySubtags,
tag,
tagCapacity,
err);
}
}
return u_terminateChars(
tag,
tagCapacity,
0,
err);
error:
if (!U_FAILURE(*err)) {
*err = U_ILLEGAL_ARGUMENT_ERROR;
}
return -1;
}
#define CHECK_TRAILING_VARIANT_SIZE(trailing, trailingLength) \
{ int32_t count = 0; \
int32_t i; \
for (i = 0; i < trailingLength; i++) { \
if (trailing[i] == '-' || trailing[i] == '_') { \
count = 0; \
if (count > 8) { \
goto error; \
} \
} else if (trailing[i] == '@') { \
break; \
} else if (count > 8) { \
goto error; \
} else { \
count++; \
} \
} \
}
static int32_t
_uloc_addLikelySubtags(const char* localeID,
char* maximizedLocaleID,
int32_t maximizedLocaleIDCapacity,
UErrorCode* err)
{
char lang[ULOC_LANG_CAPACITY];
int32_t langLength = sizeof(lang);
char script[ULOC_SCRIPT_CAPACITY];
int32_t scriptLength = sizeof(script);
char region[ULOC_COUNTRY_CAPACITY];
int32_t regionLength = sizeof(region);
const char* trailing = "";
int32_t trailingLength = 0;
int32_t trailingIndex = 0;
int32_t resultLength = 0;
if(U_FAILURE(*err)) {
goto error;
}
else if (localeID == NULL ||
maximizedLocaleID == NULL ||
maximizedLocaleIDCapacity <= 0) {
goto error;
}
trailingIndex = parseTagString(
localeID,
lang,
&langLength,
script,
&scriptLength,
region,
®ionLength,
err);
if(U_FAILURE(*err)) {
/* Overflow indicates an illegal argument error */
if (*err == U_BUFFER_OVERFLOW_ERROR) {
*err = U_ILLEGAL_ARGUMENT_ERROR;
}
goto error;
}
/* Find the length of the trailing portion. */
while (_isIDSeparator(localeID[trailingIndex])) {
trailingIndex++;
}
trailing = &localeID[trailingIndex];
trailingLength = (int32_t)uprv_strlen(trailing);
CHECK_TRAILING_VARIANT_SIZE(trailing, trailingLength);
resultLength =
createLikelySubtagsString(
lang,
langLength,
script,
scriptLength,
region,
regionLength,
trailing,
trailingLength,
maximizedLocaleID,
maximizedLocaleIDCapacity,
err);
if (resultLength == 0) {
const int32_t localIDLength = (int32_t)uprv_strlen(localeID);
/*
* If we get here, we need to return localeID.
*/
uprv_memcpy(
maximizedLocaleID,
localeID,
localIDLength <= maximizedLocaleIDCapacity ?
localIDLength : maximizedLocaleIDCapacity);
resultLength =
u_terminateChars(
maximizedLocaleID,
maximizedLocaleIDCapacity,
localIDLength,
err);
}
return resultLength;
error:
if (!U_FAILURE(*err)) {
*err = U_ILLEGAL_ARGUMENT_ERROR;
}
return -1;
}
static int32_t
_uloc_minimizeSubtags(const char* localeID,
char* minimizedLocaleID,
int32_t minimizedLocaleIDCapacity,
UErrorCode* err)
{
/**
* ULOC_FULLNAME_CAPACITY will provide enough capacity
* that we can build a string that contains the language,
* script and region code without worrying about overrunning
* the user-supplied buffer.
**/
char maximizedTagBuffer[ULOC_FULLNAME_CAPACITY];
int32_t maximizedTagBufferLength = sizeof(maximizedTagBuffer);
char lang[ULOC_LANG_CAPACITY];
int32_t langLength = sizeof(lang);
char script[ULOC_SCRIPT_CAPACITY];
int32_t scriptLength = sizeof(script);
char region[ULOC_COUNTRY_CAPACITY];
int32_t regionLength = sizeof(region);
const char* trailing = "";
int32_t trailingLength = 0;
int32_t trailingIndex = 0;
if(U_FAILURE(*err)) {
goto error;
}
else if (localeID == NULL ||
minimizedLocaleID == NULL ||
minimizedLocaleIDCapacity <= 0) {
goto error;
}
trailingIndex =
parseTagString(
localeID,
lang,
&langLength,
script,
&scriptLength,
region,
®ionLength,
err);
if(U_FAILURE(*err)) {
/* Overflow indicates an illegal argument error */
if (*err == U_BUFFER_OVERFLOW_ERROR) {
*err = U_ILLEGAL_ARGUMENT_ERROR;
}
goto error;
}
/* Find the spot where the variants or the keywords begin, if any. */
while (_isIDSeparator(localeID[trailingIndex])) {
trailingIndex++;
}
trailing = &localeID[trailingIndex];
trailingLength = (int32_t)uprv_strlen(trailing);
CHECK_TRAILING_VARIANT_SIZE(trailing, trailingLength);
createTagString(
lang,
langLength,
script,
scriptLength,
region,
regionLength,
NULL,
0,
maximizedTagBuffer,
maximizedTagBufferLength,
err);
if(U_FAILURE(*err)) {
goto error;
}
/**
* First, we need to first get the maximization
* from AddLikelySubtags.
**/
maximizedTagBufferLength =
uloc_addLikelySubtags(
maximizedTagBuffer,
maximizedTagBuffer,
maximizedTagBufferLength,
err);
if(U_FAILURE(*err)) {
goto error;
}
/**
* Start first with just the language.
**/
{
char tagBuffer[ULOC_FULLNAME_CAPACITY];
const int32_t tagBufferLength =
createLikelySubtagsString(
lang,
langLength,
NULL,
0,
NULL,
0,
NULL,
0,
tagBuffer,
sizeof(tagBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
else if (uprv_strnicmp(
maximizedTagBuffer,
tagBuffer,
tagBufferLength) == 0) {
return createTagString(
lang,
langLength,
NULL,
0,
NULL,
0,
trailing,
trailingLength,
minimizedLocaleID,
minimizedLocaleIDCapacity,
err);
}
}
/**
* Next, try the language and region.
**/
if (regionLength > 0) {
char tagBuffer[ULOC_FULLNAME_CAPACITY];
const int32_t tagBufferLength =
createLikelySubtagsString(
lang,
langLength,
NULL,
0,
region,
regionLength,
NULL,
0,
tagBuffer,
sizeof(tagBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
else if (uprv_strnicmp(
maximizedTagBuffer,
tagBuffer,
tagBufferLength) == 0) {
return createTagString(
lang,
langLength,
NULL,
0,
region,
regionLength,
trailing,
trailingLength,
minimizedLocaleID,
minimizedLocaleIDCapacity,
err);
}
}
/**
* Finally, try the language and script. This is our last chance,
* since trying with all three subtags would only yield the
* maximal version that we already have.
**/
if (scriptLength > 0 && regionLength > 0) {
char tagBuffer[ULOC_FULLNAME_CAPACITY];
const int32_t tagBufferLength =
createLikelySubtagsString(
lang,
langLength,
script,
scriptLength,
NULL,
0,
NULL,
0,
tagBuffer,
sizeof(tagBuffer),
err);
if(U_FAILURE(*err)) {
goto error;
}
else if (uprv_strnicmp(
maximizedTagBuffer,
tagBuffer,
tagBufferLength) == 0) {
return createTagString(
lang,
langLength,
script,
scriptLength,
NULL,
0,
trailing,
trailingLength,
minimizedLocaleID,
minimizedLocaleIDCapacity,
err);
}
}
{
/**
* If we got here, return the locale ID parameter.
**/
const int32_t localeIDLength = (int32_t)uprv_strlen(localeID);
uprv_memcpy(
minimizedLocaleID,
localeID,
localeIDLength <= minimizedLocaleIDCapacity ?
localeIDLength : minimizedLocaleIDCapacity);
return u_terminateChars(
minimizedLocaleID,
minimizedLocaleIDCapacity,
localeIDLength,
err);
}
error:
if (!U_FAILURE(*err)) {
*err = U_ILLEGAL_ARGUMENT_ERROR;
}
return -1;
}
static UBool
do_canonicalize(const char* localeID,
char* buffer,
int32_t bufferCapacity,
UErrorCode* err)
{
uloc_canonicalize(
localeID,
buffer,
bufferCapacity,
err);
if (*err == U_STRING_NOT_TERMINATED_WARNING ||
*err == U_BUFFER_OVERFLOW_ERROR) {
*err = U_ILLEGAL_ARGUMENT_ERROR;
return FALSE;
}
else if (U_FAILURE(*err)) {
return FALSE;
}
else {
return TRUE;
}
}
U_CAPI int32_t U_EXPORT2
uloc_addLikelySubtags(const char* localeID,
char* maximizedLocaleID,
int32_t maximizedLocaleIDCapacity,
UErrorCode* err)
{
char localeBuffer[ULOC_FULLNAME_CAPACITY];
if (!do_canonicalize(
localeID,
localeBuffer,
sizeof(localeBuffer),
err)) {
return -1;
}
else {
return _uloc_addLikelySubtags(
localeBuffer,
maximizedLocaleID,
maximizedLocaleIDCapacity,
err);
}
}
U_CAPI int32_t U_EXPORT2
uloc_minimizeSubtags(const char* localeID,
char* minimizedLocaleID,
int32_t minimizedLocaleIDCapacity,
UErrorCode* err)
{
char localeBuffer[ULOC_FULLNAME_CAPACITY];
if (!do_canonicalize(
localeID,
localeBuffer,
sizeof(localeBuffer),
err)) {
return -1;
}
else {
return _uloc_minimizeSubtags(
localeBuffer,
minimizedLocaleID,
minimizedLocaleIDCapacity,
err);
}
}
// Pairs of (language subtag, + or -) for finding out fast if common languages
// are LTR (minus) or RTL (plus).
static const char* LANG_DIR_STRING =
"root-en-es-pt-zh-ja-ko-de-fr-it-ar+he+fa+ru-nl-pl-th-tr-";
// Implemented here because this calls uloc_addLikelySubtags().
U_CAPI UBool U_EXPORT2
uloc_isRightToLeft(const char *locale) {
UErrorCode errorCode = U_ZERO_ERROR;
char script[8];
int32_t scriptLength = uloc_getScript(locale, script, UPRV_LENGTHOF(script), &errorCode);
if (U_FAILURE(errorCode) || errorCode == U_STRING_NOT_TERMINATED_WARNING ||
scriptLength == 0) {
// Fastpath: We know the likely scripts and their writing direction
// for some common languages.
errorCode = U_ZERO_ERROR;
char lang[8];
int32_t langLength = uloc_getLanguage(locale, lang, UPRV_LENGTHOF(lang), &errorCode);
if (U_FAILURE(errorCode) || errorCode == U_STRING_NOT_TERMINATED_WARNING ||
langLength == 0) {
return FALSE;
}
const char* langPtr = uprv_strstr(LANG_DIR_STRING, lang);
if (langPtr != NULL) {
switch (langPtr[langLength]) {
case '-': return FALSE;
case '+': return TRUE;
default: break; // partial match of a longer code
}
}
// Otherwise, find the likely script.
errorCode = U_ZERO_ERROR;
char likely[ULOC_FULLNAME_CAPACITY];
(void)uloc_addLikelySubtags(locale, likely, UPRV_LENGTHOF(likely), &errorCode);
if (U_FAILURE(errorCode) || errorCode == U_STRING_NOT_TERMINATED_WARNING) {
return FALSE;
}
scriptLength = uloc_getScript(likely, script, UPRV_LENGTHOF(script), &errorCode);
if (U_FAILURE(errorCode) || errorCode == U_STRING_NOT_TERMINATED_WARNING ||
scriptLength == 0) {
return FALSE;
}
}
UScriptCode scriptCode = (UScriptCode)u_getPropertyValueEnum(UCHAR_SCRIPT, script);
return uscript_isRightToLeft(scriptCode);
}
U_NAMESPACE_BEGIN
UBool
Locale::isRightToLeft() const {
return uloc_isRightToLeft(getBaseName());
}
U_NAMESPACE_END