447 lines
13 KiB
C
447 lines
13 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: ustrcase.c
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2002feb20
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* created by: Markus W. Scherer
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*
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* Implementation file for string casing C API functions.
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* Uses functions from uchar.c for basic functionality that requires access
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* to the Unicode Character Database (uprops.dat).
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*/
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#include "unicode/utypes.h"
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#include "unicode/ustring.h"
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#include "unicode/ubrk.h"
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#include "cmemory.h"
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#include "ustr_imp.h"
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/* string casing ------------------------------------------------------------ */
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/*
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* Internal titlecasing function,
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* using u_internalStrToLower() and u_internalToTitle().
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*
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* Must get titleIter!=NULL.
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*/
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U_CFUNC int32_t
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u_internalStrToTitle(UChar *dest, int32_t destCapacity,
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const UChar *src, int32_t srcLength,
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UBreakIterator *titleIter,
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const char *locale,
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UErrorCode *pErrorCode) {
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UCharIterator iter;
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UChar32 c;
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int32_t prev, index, destIndex, length;
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UBool isFirstIndex;
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/* set up local variables */
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uiter_setString(&iter, src, srcLength);
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destIndex=0;
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prev=0;
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isFirstIndex=TRUE;
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/* titlecasing loop */
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while(prev<srcLength) {
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/* find next index where to titlecase */
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if(isFirstIndex) {
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isFirstIndex=FALSE;
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index=ubrk_first(titleIter);
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} else {
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index=ubrk_next(titleIter);
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}
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if(index==UBRK_DONE || index>srcLength) {
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index=srcLength;
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}
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/* lowercase [prev..index[ */
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if(prev<index) {
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if(destIndex<destCapacity) {
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length=u_internalStrToLower(dest+destIndex, destCapacity-destIndex,
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src, srcLength,
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prev, index,
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locale,
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pErrorCode);
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} else {
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length=u_internalStrToLower(NULL, 0,
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src, srcLength,
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prev, index,
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locale,
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pErrorCode);
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}
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destIndex+=length;
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}
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if(index>=srcLength) {
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break;
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}
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/* titlecase the character at the found index */
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UTF_NEXT_CHAR(src, index, srcLength, c);
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iter.move(&iter, index, UITER_ZERO);
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if(destIndex<destCapacity) {
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length=u_internalToTitle(c, &iter,
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dest+destIndex, destCapacity-destIndex,
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locale);
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} else {
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length=u_internalToTitle(c, &iter, NULL, 0, locale);
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}
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if(length<0) {
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length=-length;
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}
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destIndex+=length;
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prev=index;
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}
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return destIndex;
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}
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/*
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* Implement argument checking and buffer handling
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* for string case mapping as a common function.
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*/
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enum {
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TO_LOWER,
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TO_UPPER,
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TO_TITLE,
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FOLD_CASE
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};
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static int32_t
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u_strCaseMap(UChar *dest, int32_t destCapacity,
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const UChar *src, int32_t srcLength,
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UBreakIterator *titleIter,
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const char *locale,
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uint32_t options,
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int32_t toWhichCase,
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UErrorCode *pErrorCode) {
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UChar buffer[300];
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UChar *temp;
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int32_t destLength;
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UBool ownTitleIter;
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/* check argument values */
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if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
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return 0;
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}
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if( destCapacity<0 ||
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(dest==NULL && destCapacity>0) ||
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src==NULL ||
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srcLength<-1
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) {
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*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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}
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/* get the string length */
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if(srcLength==-1) {
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srcLength=u_strlen(src);
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}
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/* check for overlapping source and destination */
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if( dest!=NULL &&
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((src>=dest && src<(dest+destCapacity)) ||
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(dest>=src && dest<(src+srcLength)))
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) {
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/* overlap: provide a temporary destination buffer and later copy the result */
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if(destCapacity<=(sizeof(buffer)/U_SIZEOF_UCHAR)) {
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/* the stack buffer is large enough */
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temp=buffer;
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} else {
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/* allocate a buffer */
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temp=(UChar *)uprv_malloc(destCapacity*U_SIZEOF_UCHAR);
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if(temp==NULL) {
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*pErrorCode=U_MEMORY_ALLOCATION_ERROR;
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return 0;
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}
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}
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} else {
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temp=dest;
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}
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ownTitleIter=FALSE;
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if(toWhichCase==TO_LOWER) {
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destLength=u_internalStrToLower(temp, destCapacity,
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src, srcLength,
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0, srcLength,
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locale, pErrorCode);
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} else if(toWhichCase==TO_UPPER) {
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destLength=u_internalStrToUpper(temp, destCapacity, src, srcLength,
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locale, pErrorCode);
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} else if(toWhichCase==TO_TITLE) {
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if(titleIter==NULL) {
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titleIter=ubrk_open(UBRK_TITLE, locale,
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src, srcLength,
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pErrorCode);
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ownTitleIter=(UBool)U_SUCCESS(*pErrorCode);
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}
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if(U_SUCCESS(*pErrorCode)) {
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destLength=u_internalStrToTitle(temp, destCapacity, src, srcLength,
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titleIter, locale, pErrorCode);
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}
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} else {
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destLength=u_internalStrFoldCase(temp, destCapacity, src, srcLength,
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options, pErrorCode);
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}
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if(temp!=dest) {
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/* copy the result string to the destination buffer */
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if(destLength>0) {
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uprv_memmove(dest, temp, destLength*U_SIZEOF_UCHAR);
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}
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if(temp!=buffer) {
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uprv_free(temp);
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}
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}
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if(ownTitleIter) {
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ubrk_close(titleIter);
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}
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return u_terminateUChars(dest, destCapacity, destLength, pErrorCode);
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}
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U_CAPI int32_t U_EXPORT2
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u_strToLower(UChar *dest, int32_t destCapacity,
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const UChar *src, int32_t srcLength,
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const char *locale,
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UErrorCode *pErrorCode) {
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return u_strCaseMap(dest, destCapacity,
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src, srcLength,
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NULL, locale, 0,
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TO_LOWER, pErrorCode);
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}
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U_CAPI int32_t U_EXPORT2
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u_strToUpper(UChar *dest, int32_t destCapacity,
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const UChar *src, int32_t srcLength,
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const char *locale,
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UErrorCode *pErrorCode) {
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return u_strCaseMap(dest, destCapacity,
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src, srcLength,
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NULL, locale, 0,
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TO_UPPER, pErrorCode);
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}
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U_CAPI int32_t U_EXPORT2
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u_strToTitle(UChar *dest, int32_t destCapacity,
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const UChar *src, int32_t srcLength,
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UBreakIterator *titleIter,
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const char *locale,
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UErrorCode *pErrorCode) {
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return u_strCaseMap(dest, destCapacity,
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src, srcLength,
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titleIter, locale, 0,
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TO_TITLE, pErrorCode);
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}
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U_CAPI int32_t U_EXPORT2
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u_strFoldCase(UChar *dest, int32_t destCapacity,
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const UChar *src, int32_t srcLength,
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uint32_t options,
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UErrorCode *pErrorCode) {
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return u_strCaseMap(dest, destCapacity,
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src, srcLength,
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NULL, NULL, options,
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FOLD_CASE, pErrorCode);
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}
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/* case-insensitive string comparisons */
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U_CAPI int32_t U_EXPORT2
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u_strcasecmp(const UChar *s1, const UChar *s2, uint32_t options) {
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UChar t1[32], t2[32]; /* temporary buffers holding case-folded parts of s1 and s2 */
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UChar32 c;
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UChar uc;
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int32_t pos1, pos2, len1, len2, result;
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if(!uprv_haveProperties()) {
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/* hardcode ASCII strcasecmp() */
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UChar c1, c2;
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for(;;) {
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c1=*s1++;
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if((uint16_t)(c1-0x41)<26) {
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c1+=0x20;
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}
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c2=*s2++;
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if((uint16_t)(c2-0x41)<26) {
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c2+=0x20;
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}
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result=(int32_t)c1-(int32_t)c2;
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if(result!=0 || c1==0) {
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return result;
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}
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}
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}
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pos1=pos2=len1=len2=0;
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for(;;) {
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/* make sure that the temporary buffers are not empty */
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if(pos1>=len1) {
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c=*s1++;
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if(c!=0) {
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if(UTF_IS_FIRST_SURROGATE(c) && UTF_IS_SECOND_SURROGATE(uc=*s1)) {
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c=UTF16_GET_PAIR_VALUE(c, uc);
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++s1;
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}
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len1=u_internalFoldCase(c, t1, 32, options);
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if(len1<0) {
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len1=-len1;
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}
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pos1=0;
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} else if(pos2>=len2 && *s2==0) {
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return 0;
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} else {
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return -1;
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}
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}
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if(pos2>=len2) {
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c=*s2++;
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if(c!=0) {
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if(UTF_IS_FIRST_SURROGATE(c) && UTF_IS_SECOND_SURROGATE(uc=*s2)) {
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c=UTF16_GET_PAIR_VALUE(c, uc);
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++s2;
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}
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len2=u_internalFoldCase(c, t2, 32, options);
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if(len2<0) {
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len2=-len2;
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}
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pos2=0;
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} else {
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return 1;
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}
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}
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/* compare the head code units from both folded strings */
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result=(int32_t)t1[pos1++]-(int32_t)t2[pos2++];
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if(result!=0) {
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return result;
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}
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}
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}
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U_CFUNC int32_t
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u_internalStrcasecmp(const UChar *s1, int32_t length1,
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const UChar *s2, int32_t length2,
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uint32_t options) {
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UChar t1[32], t2[32]; /* temporary buffers holding case-folded parts of s1 and s2 */
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UChar32 c;
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UChar uc;
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int32_t pos1, pos2, len1, len2, result;
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if(!uprv_haveProperties()) {
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/* hardcode ASCII strcasecmp() */
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UChar c1, c2;
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for(;;) {
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if(length1<=0) {
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if(length2<=0) {
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return 0;
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} else {
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return -1;
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}
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} else if(length2<=0) {
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return 1;
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}
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c1=*s1++;
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if((uint16_t)(c1-0x41)<26) {
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c1+=0x20;
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}
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c2=*s2++;
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if((uint16_t)(c2-0x41)<26) {
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c2+=0x20;
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}
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result=(int32_t)c1-(int32_t)c2;
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if(result!=0) {
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return result;
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}
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--length1;
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--length2;
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}
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}
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pos1=pos2=len1=len2=0;
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for(;;) {
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/* make sure that the temporary buffers are not empty */
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if(pos1>=len1) {
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if(length1>0) {
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c=*s1++;
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if(UTF_IS_FIRST_SURROGATE(c) && length1>1 && UTF_IS_SECOND_SURROGATE(uc=*s1)) {
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c=UTF16_GET_PAIR_VALUE(c, uc);
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++s1;
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length1-=2;
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} else {
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--length1;
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}
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len1=u_internalFoldCase(c, t1, 32, options);
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if(len1<0) {
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len1=-len1;
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}
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pos1=0;
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} else if(pos2>=len2 && length2<=0) {
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return 0;
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} else {
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return -1;
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}
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}
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if(pos2>=len2) {
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if(length2>0) {
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c=*s2++;
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if(UTF_IS_FIRST_SURROGATE(c) && length2>1 && UTF_IS_SECOND_SURROGATE(uc=*s2)) {
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c=UTF16_GET_PAIR_VALUE(c, uc);
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++s2;
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length2-=2;
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} else {
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--length2;
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}
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len2=u_internalFoldCase(c, t2, 32, options);
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if(len2<0) {
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len2=-len2;
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}
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pos2=0;
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} else {
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return 1;
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}
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}
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/* compare the head code units from both folded strings */
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result=(int32_t)t1[pos1++]-(int32_t)t2[pos2++];
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if(result!=0) {
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return result;
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}
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}
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}
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U_CAPI int32_t U_EXPORT2
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u_memcasecmp(const UChar *s1, const UChar *s2, int32_t length, uint32_t options) {
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return u_internalStrcasecmp(s1, length, s2, length, options);
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}
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U_CAPI int32_t U_EXPORT2
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u_strncasecmp(const UChar *s1, const UChar *s2, int32_t n, uint32_t options) {
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/*
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* This is a simple, sub-optimal implementation:
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* Determine the actual lengths of the strings and call u_internalStrcasecmp().
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* This saves us from having an additional variant of the above strcasecmp().
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*/
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const UChar *s;
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int32_t length1, length2;
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for(s=s1, length1=0; length1<n && *s!=0; ++s, ++length1) {}
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for(s=s2, length2=0; length2<n && *s!=0; ++s, ++length2) {}
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return u_internalStrcasecmp(s1, length1, s2, length2, options);
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}
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