d07396f94d
ICU-20041 ICU4C NumberingSystem class doesn't handle out-of-memory (OOM) failures. - Not all code paths in the NumberingSystem class check for OOM failures. This can lead to crashes in some cases as null pointers will be dereferenced without any checks. - Change to use nullptr instead of NULL. - Don't stomp on OOM errors when attempting to load resources. We should report back OOM to the caller. - Use LocalPointer in order simplify the code and for automatic clean-up of memory. - Use LocalUResourceBundlePointer as well to help simply things even more.
360 lines
11 KiB
C++
360 lines
11 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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* Copyright (C) 2010-2015, International Business Machines Corporation and
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* others. All Rights Reserved.
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*******************************************************************************
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*
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*
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* File NUMSYS.CPP
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*
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* Modification History:*
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* Date Name Description
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*
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********************************************************************************
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*/
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#include "unicode/utypes.h"
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#include "unicode/localpointer.h"
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#include "unicode/uchar.h"
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#include "unicode/unistr.h"
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#include "unicode/ures.h"
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#include "unicode/ustring.h"
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#include "unicode/uloc.h"
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#include "unicode/schriter.h"
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#include "unicode/numsys.h"
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#include "cstring.h"
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#include "uassert.h"
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#include "uresimp.h"
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#include "numsys_impl.h"
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#if !UCONFIG_NO_FORMATTING
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U_NAMESPACE_BEGIN
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// Useful constants
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#define DEFAULT_DIGITS UNICODE_STRING_SIMPLE("0123456789");
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static const char gNumberingSystems[] = "numberingSystems";
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static const char gNumberElements[] = "NumberElements";
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static const char gDefault[] = "default";
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static const char gNative[] = "native";
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static const char gTraditional[] = "traditional";
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static const char gFinance[] = "finance";
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static const char gDesc[] = "desc";
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static const char gRadix[] = "radix";
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static const char gAlgorithmic[] = "algorithmic";
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static const char gLatn[] = "latn";
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(NumberingSystem)
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(NumsysNameEnumeration)
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/**
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* Default Constructor.
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*
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* @draft ICU 4.2
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*/
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NumberingSystem::NumberingSystem() {
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radix = 10;
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algorithmic = FALSE;
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UnicodeString defaultDigits = DEFAULT_DIGITS;
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desc.setTo(defaultDigits);
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uprv_strcpy(name,gLatn);
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}
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/**
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* Copy constructor.
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* @draft ICU 4.2
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*/
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NumberingSystem::NumberingSystem(const NumberingSystem& other)
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: UObject(other) {
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*this=other;
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}
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NumberingSystem* U_EXPORT2
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NumberingSystem::createInstance(int32_t radix_in, UBool isAlgorithmic_in, const UnicodeString & desc_in, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return nullptr;
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}
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if ( radix_in < 2 ) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return nullptr;
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}
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if ( !isAlgorithmic_in ) {
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if ( desc_in.countChar32() != radix_in ) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return nullptr;
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}
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}
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LocalPointer<NumberingSystem> ns(new NumberingSystem(), status);
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if (U_FAILURE(status)) {
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return nullptr;
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}
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ns->setRadix(radix_in);
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ns->setDesc(desc_in);
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ns->setAlgorithmic(isAlgorithmic_in);
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ns->setName(nullptr);
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return ns.orphan();
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}
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NumberingSystem* U_EXPORT2
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NumberingSystem::createInstance(const Locale & inLocale, UErrorCode& status) {
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if (U_FAILURE(status)) {
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return nullptr;
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}
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UBool nsResolved = TRUE;
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UBool usingFallback = FALSE;
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char buffer[ULOC_KEYWORDS_CAPACITY];
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int32_t count = inLocale.getKeywordValue("numbers", buffer, sizeof(buffer), status);
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if (U_FAILURE(status) || status == U_STRING_NOT_TERMINATED_WARNING) {
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// the "numbers" keyword exceeds ULOC_KEYWORDS_CAPACITY; ignore and use default.
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count = 0;
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status = U_ZERO_ERROR;
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}
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if ( count > 0 ) { // @numbers keyword was specified in the locale
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U_ASSERT(count < ULOC_KEYWORDS_CAPACITY);
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buffer[count] = '\0'; // Make sure it is null terminated.
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if ( !uprv_strcmp(buffer,gDefault) || !uprv_strcmp(buffer,gNative) ||
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!uprv_strcmp(buffer,gTraditional) || !uprv_strcmp(buffer,gFinance)) {
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nsResolved = FALSE;
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}
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} else {
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uprv_strcpy(buffer, gDefault);
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nsResolved = FALSE;
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}
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if (!nsResolved) { // Resolve the numbering system ( default, native, traditional or finance ) into a "real" numbering system
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UErrorCode localStatus = U_ZERO_ERROR;
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LocalUResourceBundlePointer resource(ures_open(nullptr, inLocale.getName(), &localStatus));
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LocalUResourceBundlePointer numberElementsRes(ures_getByKey(resource.getAlias(), gNumberElements, nullptr, &localStatus));
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// Don't stomp on the catastrophic failure of OOM.
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if (localStatus == U_MEMORY_ALLOCATION_ERROR) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return nullptr;
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}
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while (!nsResolved) {
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localStatus = U_ZERO_ERROR;
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count = 0;
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const UChar *nsName = ures_getStringByKeyWithFallback(numberElementsRes.getAlias(), buffer, &count, &localStatus);
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// Don't stomp on the catastrophic failure of OOM.
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if (localStatus == U_MEMORY_ALLOCATION_ERROR) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return nullptr;
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}
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if ( count > 0 && count < ULOC_KEYWORDS_CAPACITY ) { // numbering system found
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u_UCharsToChars(nsName, buffer, count);
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buffer[count] = '\0'; // Make sure it is null terminated.
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nsResolved = TRUE;
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}
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if (!nsResolved) { // Fallback behavior per TR35 - traditional falls back to native, finance and native fall back to default
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if (!uprv_strcmp(buffer,gNative) || !uprv_strcmp(buffer,gFinance)) {
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uprv_strcpy(buffer,gDefault);
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} else if (!uprv_strcmp(buffer,gTraditional)) {
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uprv_strcpy(buffer,gNative);
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} else { // If we get here we couldn't find even the default numbering system
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usingFallback = TRUE;
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nsResolved = TRUE;
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}
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}
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}
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}
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if (usingFallback) {
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status = U_USING_FALLBACK_WARNING;
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NumberingSystem *ns = new NumberingSystem();
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if (ns == nullptr) {
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status = U_MEMORY_ALLOCATION_ERROR;
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}
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return ns;
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} else {
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return NumberingSystem::createInstanceByName(buffer, status);
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}
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}
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NumberingSystem* U_EXPORT2
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NumberingSystem::createInstance(UErrorCode& status) {
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return NumberingSystem::createInstance(Locale::getDefault(), status);
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}
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NumberingSystem* U_EXPORT2
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NumberingSystem::createInstanceByName(const char *name, UErrorCode& status) {
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int32_t radix = 10;
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int32_t algorithmic = 0;
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LocalUResourceBundlePointer numberingSystemsInfo(ures_openDirect(nullptr, gNumberingSystems, &status));
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LocalUResourceBundlePointer nsCurrent(ures_getByKey(numberingSystemsInfo.getAlias(), gNumberingSystems, nullptr, &status));
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LocalUResourceBundlePointer nsTop(ures_getByKey(nsCurrent.getAlias(), name, nullptr, &status));
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UnicodeString nsd = ures_getUnicodeStringByKey(nsTop.getAlias(), gDesc, &status);
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ures_getByKey(nsTop.getAlias(), gRadix, nsCurrent.getAlias(), &status);
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radix = ures_getInt(nsCurrent.getAlias(), &status);
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ures_getByKey(nsTop.getAlias(), gAlgorithmic, nsCurrent.getAlias(), &status);
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algorithmic = ures_getInt(nsCurrent.getAlias(), &status);
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UBool isAlgorithmic = ( algorithmic == 1 );
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if (U_FAILURE(status)) {
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// Don't stomp on the catastrophic failure of OOM.
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if (status != U_MEMORY_ALLOCATION_ERROR) {
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status = U_UNSUPPORTED_ERROR;
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}
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return nullptr;
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}
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LocalPointer<NumberingSystem> ns(NumberingSystem::createInstance(radix, isAlgorithmic, nsd, status), status);
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if (U_FAILURE(status)) {
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return nullptr;
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}
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ns->setName(name);
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return ns.orphan();
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}
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/**
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* Destructor.
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* @draft ICU 4.2
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*/
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NumberingSystem::~NumberingSystem() {
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}
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int32_t NumberingSystem::getRadix() const {
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return radix;
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}
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UnicodeString NumberingSystem::getDescription() const {
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return desc;
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}
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const char * NumberingSystem::getName() const {
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return name;
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}
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void NumberingSystem::setRadix(int32_t r) {
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radix = r;
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}
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void NumberingSystem::setAlgorithmic(UBool c) {
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algorithmic = c;
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}
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void NumberingSystem::setDesc(const UnicodeString &d) {
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desc.setTo(d);
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}
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void NumberingSystem::setName(const char *n) {
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if ( n == nullptr ) {
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name[0] = (char) 0;
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} else {
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uprv_strncpy(name,n,NUMSYS_NAME_CAPACITY);
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name[NUMSYS_NAME_CAPACITY] = '\0'; // Make sure it is null terminated.
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}
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}
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UBool NumberingSystem::isAlgorithmic() const {
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return ( algorithmic );
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}
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StringEnumeration* NumberingSystem::getAvailableNames(UErrorCode &status) {
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// TODO(ticket #11908): Init-once static cache, with u_cleanup() callback.
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static StringEnumeration* availableNames = nullptr;
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if (U_FAILURE(status)) {
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return nullptr;
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}
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if ( availableNames == nullptr ) {
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// TODO: Simple array of UnicodeString objects, based on length of table resource?
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LocalPointer<UVector> numsysNames(new UVector(uprv_deleteUObject, nullptr, status), status);
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if (U_FAILURE(status)) {
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return nullptr;
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}
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UErrorCode rbstatus = U_ZERO_ERROR;
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UResourceBundle *numberingSystemsInfo = ures_openDirect(nullptr, "numberingSystems", &rbstatus);
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numberingSystemsInfo = ures_getByKey(numberingSystemsInfo, "numberingSystems", numberingSystemsInfo, &rbstatus);
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if (U_FAILURE(rbstatus)) {
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// Don't stomp on the catastrophic failure of OOM.
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if (rbstatus == U_MEMORY_ALLOCATION_ERROR) {
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status = rbstatus;
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} else {
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status = U_MISSING_RESOURCE_ERROR;
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}
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ures_close(numberingSystemsInfo);
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return nullptr;
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}
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while ( ures_hasNext(numberingSystemsInfo) && U_SUCCESS(status) ) {
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LocalUResourceBundlePointer nsCurrent(ures_getNextResource(numberingSystemsInfo, nullptr, &rbstatus));
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if (rbstatus == U_MEMORY_ALLOCATION_ERROR) {
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status = rbstatus; // we want to report OOM failure back to the caller.
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break;
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}
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const char *nsName = ures_getKey(nsCurrent.getAlias());
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LocalPointer<UnicodeString> newElem(new UnicodeString(nsName, -1, US_INV), status);
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if (U_SUCCESS(status)) {
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numsysNames->addElement(newElem.getAlias(), status);
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if (U_SUCCESS(status)) {
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newElem.orphan(); // on success, the numsysNames vector owns newElem.
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}
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}
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}
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ures_close(numberingSystemsInfo);
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if (U_FAILURE(status)) {
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return nullptr;
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}
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availableNames = new NumsysNameEnumeration(numsysNames.getAlias(), status);
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if (availableNames == nullptr) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return nullptr;
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}
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numsysNames.orphan(); // The names got adopted.
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}
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return availableNames;
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}
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NumsysNameEnumeration::NumsysNameEnumeration(UVector *numsysNames, UErrorCode& /*status*/) {
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pos=0;
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fNumsysNames = numsysNames;
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}
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const UnicodeString*
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NumsysNameEnumeration::snext(UErrorCode& status) {
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if (U_SUCCESS(status) && (fNumsysNames != nullptr) && (pos < fNumsysNames->size())) {
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return (const UnicodeString*)fNumsysNames->elementAt(pos++);
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}
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return nullptr;
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}
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void
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NumsysNameEnumeration::reset(UErrorCode& /*status*/) {
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pos=0;
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}
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int32_t
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NumsysNameEnumeration::count(UErrorCode& /*status*/) const {
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return (fNumsysNames==nullptr) ? 0 : fNumsysNames->size();
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}
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NumsysNameEnumeration::~NumsysNameEnumeration() {
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delete fNumsysNames;
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}
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_FORMATTING */
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//eof
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