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-rw-r--r--Build/source/libs/icu/icu-xetex/common/ustrcase.c981
1 files changed, 981 insertions, 0 deletions
diff --git a/Build/source/libs/icu/icu-xetex/common/ustrcase.c b/Build/source/libs/icu/icu-xetex/common/ustrcase.c
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index 00000000000..402201d8dc0
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+++ b/Build/source/libs/icu/icu-xetex/common/ustrcase.c
@@ -0,0 +1,981 @@
+/*
+*******************************************************************************
+*
+* Copyright (C) 2001-2007, International Business Machines
+* Corporation and others. All Rights Reserved.
+*
+*******************************************************************************
+* file name: ustrcase.c
+* encoding: US-ASCII
+* tab size: 8 (not used)
+* indentation:4
+*
+* created on: 2002feb20
+* created by: Markus W. Scherer
+*
+* Implementation file for string casing C API functions.
+* Uses functions from uchar.c for basic functionality that requires access
+* to the Unicode Character Database (uprops.dat).
+*/
+
+#include "unicode/utypes.h"
+#include "unicode/uloc.h"
+#include "unicode/ustring.h"
+#include "unicode/ucasemap.h"
+#include "unicode/ubrk.h"
+#include "cmemory.h"
+#include "ucase.h"
+#include "unormimp.h"
+#include "ustr_imp.h"
+
+/* string casing ------------------------------------------------------------ */
+
+/* append a full case mapping result, see UCASE_MAX_STRING_LENGTH */
+static U_INLINE int32_t
+appendResult(UChar *dest, int32_t destIndex, int32_t destCapacity,
+ int32_t result, const UChar *s) {
+ UChar32 c;
+ int32_t length;
+
+ /* decode the result */
+ if(result<0) {
+ /* (not) original code point */
+ c=~result;
+ length=-1;
+ } else if(result<=UCASE_MAX_STRING_LENGTH) {
+ c=U_SENTINEL;
+ length=result;
+ } else {
+ c=result;
+ length=-1;
+ }
+
+ if(destIndex<destCapacity) {
+ /* append the result */
+ if(length<0) {
+ /* code point */
+ UBool isError=FALSE;
+ U16_APPEND(dest, destIndex, destCapacity, c, isError);
+ if(isError) {
+ /* overflow, nothing written */
+ destIndex+=U16_LENGTH(c);
+ }
+ } else {
+ /* string */
+ if((destIndex+length)<=destCapacity) {
+ while(length>0) {
+ dest[destIndex++]=*s++;
+ --length;
+ }
+ } else {
+ /* overflow */
+ destIndex+=length;
+ }
+ }
+ } else {
+ /* preflight */
+ if(length<0) {
+ destIndex+=U16_LENGTH(c);
+ } else {
+ destIndex+=length;
+ }
+ }
+ return destIndex;
+}
+
+static UChar32 U_CALLCONV
+utf16_caseContextIterator(void *context, int8_t dir) {
+ UCaseContext *csc=(UCaseContext *)context;
+ UChar32 c;
+
+ if(dir<0) {
+ /* reset for backward iteration */
+ csc->index=csc->cpStart;
+ csc->dir=dir;
+ } else if(dir>0) {
+ /* reset for forward iteration */
+ csc->index=csc->cpLimit;
+ csc->dir=dir;
+ } else {
+ /* continue current iteration direction */
+ dir=csc->dir;
+ }
+
+ if(dir<0) {
+ if(csc->start<csc->index) {
+ U16_PREV((const UChar *)csc->p, csc->start, csc->index, c);
+ return c;
+ }
+ } else {
+ if(csc->index<csc->limit) {
+ U16_NEXT((const UChar *)csc->p, csc->index, csc->limit, c);
+ return c;
+ }
+ }
+ return U_SENTINEL;
+}
+
+/*
+ * Case-maps [srcStart..srcLimit[ but takes
+ * context [0..srcLength[ into account.
+ */
+static int32_t
+_caseMap(const UCaseMap *csm, UCaseMapFull *map,
+ UChar *dest, int32_t destCapacity,
+ const UChar *src, UCaseContext *csc,
+ int32_t srcStart, int32_t srcLimit,
+ UErrorCode *pErrorCode) {
+ const UChar *s;
+ UChar32 c, c2;
+ int32_t srcIndex, destIndex;
+ int32_t locCache;
+
+ locCache=csm->locCache;
+
+ /* case mapping loop */
+ srcIndex=srcStart;
+ destIndex=0;
+ while(srcIndex<srcLimit) {
+ csc->cpStart=srcIndex;
+ U16_NEXT(src, srcIndex, srcLimit, c);
+ csc->cpLimit=srcIndex;
+ c=map(csm->csp, c, utf16_caseContextIterator, csc, &s, csm->locale, &locCache);
+ if((destIndex<destCapacity) && (c<0 ? (c2=~c)<=0xffff : UCASE_MAX_STRING_LENGTH<c && (c2=c)<=0xffff)) {
+ /* fast path version of appendResult() for BMP results */
+ dest[destIndex++]=(UChar)c2;
+ } else {
+ destIndex=appendResult(dest, destIndex, destCapacity, c, s);
+ }
+ }
+
+ if(destIndex>destCapacity) {
+ *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
+ }
+ return destIndex;
+}
+
+static void
+setTempCaseMapLocale(UCaseMap *csm, const char *locale, UErrorCode *pErrorCode) {
+ /*
+ * We could call ucasemap_setLocale(), but here we really only care about
+ * the initial language subtag, we need not return the real string via
+ * ucasemap_getLocale(), and we don't care about only getting "x" from
+ * "x-some-thing" etc.
+ *
+ * We ignore locales with a longer-than-3 initial subtag.
+ *
+ * We also do not fill in the locCache because it is rarely used,
+ * and not worth setting unless we reuse it for many case mapping operations.
+ * (That's why UCaseMap was created.)
+ */
+ int i;
+ char c;
+
+ /* the internal functions require locale!=NULL */
+ if(locale==NULL) {
+ locale=uloc_getDefault();
+ }
+ for(i=0; i<4 && (c=locale[i])!=0 && c!='-' && c!='_'; ++i) {
+ csm->locale[i]=c;
+ }
+ if(i<=3) {
+ csm->locale[i]=0; /* Up to 3 non-separator characters. */
+ } else {
+ csm->locale[0]=0; /* Longer-than-3 initial subtag: Ignore. */
+ }
+}
+
+/*
+ * Set parameters on an empty UCaseMap, for UCaseMap-less API functions.
+ * Do this fast because it is called with every function call.
+ */
+static U_INLINE void
+setTempCaseMap(UCaseMap *csm, const char *locale, UErrorCode *pErrorCode) {
+ if(csm->csp==NULL) {
+ csm->csp=ucase_getSingleton(pErrorCode);
+ if(U_FAILURE(*pErrorCode)) {
+ return;
+ }
+ }
+ if(locale!=NULL && locale[0]==0) {
+ csm->locale[0]=0;
+ } else {
+ setTempCaseMapLocale(csm, locale, pErrorCode);
+ }
+}
+
+#if !UCONFIG_NO_BREAK_ITERATION
+
+/*
+ * Internal titlecasing function.
+ */
+static int32_t
+_toTitle(UCaseMap *csm,
+ UChar *dest, int32_t destCapacity,
+ const UChar *src, UCaseContext *csc,
+ int32_t srcLength,
+ UErrorCode *pErrorCode) {
+ const UChar *s;
+ UChar32 c;
+ int32_t prev, titleStart, titleLimit, index, destIndex, length;
+ UBool isFirstIndex;
+
+ if(csm->iter!=NULL) {
+ ubrk_setText(csm->iter, src, srcLength, pErrorCode);
+ } else {
+ csm->iter=ubrk_open(UBRK_WORD, csm->locale,
+ src, srcLength,
+ pErrorCode);
+ }
+ if(U_FAILURE(*pErrorCode)) {
+ return 0;
+ }
+
+ /* set up local variables */
+ destIndex=0;
+ prev=0;
+ isFirstIndex=TRUE;
+
+ /* titlecasing loop */
+ while(prev<srcLength) {
+ /* find next index where to titlecase */
+ if(isFirstIndex) {
+ isFirstIndex=FALSE;
+ index=ubrk_first(csm->iter);
+ } else {
+ index=ubrk_next(csm->iter);
+ }
+ if(index==UBRK_DONE || index>srcLength) {
+ index=srcLength;
+ }
+
+ /*
+ * Unicode 4 & 5 section 3.13 Default Case Operations:
+ *
+ * R3 toTitlecase(X): Find the word boundaries based on Unicode Standard Annex
+ * #29, "Text Boundaries." Between each pair of word boundaries, find the first
+ * cased character F. If F exists, map F to default_title(F); then map each
+ * subsequent character C to default_lower(C).
+ *
+ * In this implementation, segment [prev..index[ into 3 parts:
+ * a) uncased characters (copy as-is) [prev..titleStart[
+ * b) first case letter (titlecase) [titleStart..titleLimit[
+ * c) subsequent characters (lowercase) [titleLimit..index[
+ */
+ if(prev<index) {
+ /* find and copy uncased characters [prev..titleStart[ */
+ titleStart=titleLimit=prev;
+ U16_NEXT(src, titleLimit, index, c);
+ if((csm->options&U_TITLECASE_NO_BREAK_ADJUSTMENT)==0 && UCASE_NONE==ucase_getType(csm->csp, c)) {
+ /* Adjust the titlecasing index (titleStart) to the next cased character. */
+ for(;;) {
+ titleStart=titleLimit;
+ if(titleLimit==index) {
+ /*
+ * only uncased characters in [prev..index[
+ * stop with titleStart==titleLimit==index
+ */
+ break;
+ }
+ U16_NEXT(src, titleLimit, index, c);
+ if(UCASE_NONE!=ucase_getType(csm->csp, c)) {
+ break; /* cased letter at [titleStart..titleLimit[ */
+ }
+ }
+ length=titleStart-prev;
+ if(length>0) {
+ if((destIndex+length)<=destCapacity) {
+ uprv_memcpy(dest+destIndex, src+prev, length*U_SIZEOF_UCHAR);
+ }
+ destIndex+=length;
+ }
+ }
+
+ if(titleStart<titleLimit) {
+ /* titlecase c which is from [titleStart..titleLimit[ */
+ csc->cpStart=titleStart;
+ csc->cpLimit=titleLimit;
+ c=ucase_toFullTitle(csm->csp, c, utf16_caseContextIterator, csc, &s, csm->locale, &csm->locCache);
+ destIndex=appendResult(dest, destIndex, destCapacity, c, s);
+
+ /* lowercase [titleLimit..index[ */
+ if(titleLimit<index) {
+ if((csm->options&U_TITLECASE_NO_LOWERCASE)==0) {
+ /* Normal operation: Lowercase the rest of the word. */
+ destIndex+=
+ _caseMap(
+ csm, ucase_toFullLower,
+ dest+destIndex, destCapacity-destIndex,
+ src, csc,
+ titleLimit, index,
+ pErrorCode);
+ } else {
+ /* Optionally just copy the rest of the word unchanged. */
+ length=index-titleLimit;
+ if((destIndex+length)<=destCapacity) {
+ uprv_memcpy(dest+destIndex, src+titleLimit, length*U_SIZEOF_UCHAR);
+ }
+ destIndex+=length;
+ }
+ }
+ }
+ }
+
+ prev=index;
+ }
+
+ if(destIndex>destCapacity) {
+ *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
+ }
+ return destIndex;
+}
+
+#endif
+
+/* functions available in the common library (for unistr_case.cpp) */
+
+U_CFUNC int32_t
+ustr_toLower(const UCaseProps *csp,
+ UChar *dest, int32_t destCapacity,
+ const UChar *src, int32_t srcLength,
+ const char *locale,
+ UErrorCode *pErrorCode) {
+ UCaseMap csm={ NULL };
+ UCaseContext csc={ NULL };
+
+ csm.csp=csp;
+ setTempCaseMap(&csm, locale, pErrorCode);
+ csc.p=(void *)src;
+ csc.limit=srcLength;
+
+ return _caseMap(&csm, ucase_toFullLower,
+ dest, destCapacity,
+ src, &csc, 0, srcLength,
+ pErrorCode);
+}
+
+U_CFUNC int32_t
+ustr_toUpper(const UCaseProps *csp,
+ UChar *dest, int32_t destCapacity,
+ const UChar *src, int32_t srcLength,
+ const char *locale,
+ UErrorCode *pErrorCode) {
+ UCaseMap csm={ NULL };
+ UCaseContext csc={ NULL };
+
+ csm.csp=csp;
+ setTempCaseMap(&csm, locale, pErrorCode);
+ csc.p=(void *)src;
+ csc.limit=srcLength;
+
+ return _caseMap(&csm, ucase_toFullUpper,
+ dest, destCapacity,
+ src, &csc, 0, srcLength,
+ pErrorCode);
+}
+
+#if !UCONFIG_NO_BREAK_ITERATION
+
+U_CFUNC int32_t
+ustr_toTitle(const UCaseProps *csp,
+ UChar *dest, int32_t destCapacity,
+ const UChar *src, int32_t srcLength,
+ UBreakIterator *titleIter,
+ const char *locale, uint32_t options,
+ UErrorCode *pErrorCode) {
+ UCaseMap csm={ NULL };
+ UCaseContext csc={ NULL };
+ int32_t length;
+
+ csm.csp=csp;
+ csm.iter=titleIter;
+ csm.options=options;
+ setTempCaseMap(&csm, locale, pErrorCode);
+ csc.p=(void *)src;
+ csc.limit=srcLength;
+
+ length=_toTitle(&csm,
+ dest, destCapacity,
+ src, &csc, srcLength,
+ pErrorCode);
+ if(titleIter==NULL && csm.iter!=NULL) {
+ ubrk_close(csm.iter);
+ }
+ return length;
+}
+
+#endif
+
+U_CFUNC int32_t
+ustr_foldCase(const UCaseProps *csp,
+ UChar *dest, int32_t destCapacity,
+ const UChar *src, int32_t srcLength,
+ uint32_t options,
+ UErrorCode *pErrorCode) {
+ int32_t srcIndex, destIndex;
+
+ const UChar *s;
+ UChar32 c, c2;
+
+ /* case mapping loop */
+ srcIndex=destIndex=0;
+ while(srcIndex<srcLength) {
+ U16_NEXT(src, srcIndex, srcLength, c);
+ c=ucase_toFullFolding(csp, c, &s, options);
+ if((destIndex<destCapacity) && (c<0 ? (c2=~c)<=0xffff : UCASE_MAX_STRING_LENGTH<c && (c2=c)<=0xffff)) {
+ /* fast path version of appendResult() for BMP results */
+ dest[destIndex++]=(UChar)c2;
+ } else {
+ destIndex=appendResult(dest, destIndex, destCapacity, c, s);
+ }
+ }
+
+ if(destIndex>destCapacity) {
+ *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
+ }
+ return destIndex;
+}
+
+/*
+ * Implement argument checking and buffer handling
+ * for string case mapping as a common function.
+ */
+
+/* common internal function for public API functions */
+
+static int32_t
+caseMap(const UCaseMap *csm,
+ UChar *dest, int32_t destCapacity,
+ const UChar *src, int32_t srcLength,
+ int32_t toWhichCase,
+ UErrorCode *pErrorCode) {
+ UChar buffer[300];
+ UChar *temp;
+
+ int32_t destLength;
+
+ /* check argument values */
+ if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
+ return 0;
+ }
+ if( destCapacity<0 ||
+ (dest==NULL && destCapacity>0) ||
+ src==NULL ||
+ srcLength<-1
+ ) {
+ *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
+ return 0;
+ }
+
+ /* get the string length */
+ if(srcLength==-1) {
+ srcLength=u_strlen(src);
+ }
+
+ /* check for overlapping source and destination */
+ if( dest!=NULL &&
+ ((src>=dest && src<(dest+destCapacity)) ||
+ (dest>=src && dest<(src+srcLength)))
+ ) {
+ /* overlap: provide a temporary destination buffer and later copy the result */
+ if(destCapacity<=(sizeof(buffer)/U_SIZEOF_UCHAR)) {
+ /* the stack buffer is large enough */
+ temp=buffer;
+ } else {
+ /* allocate a buffer */
+ temp=(UChar *)uprv_malloc(destCapacity*U_SIZEOF_UCHAR);
+ if(temp==NULL) {
+ *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
+ return 0;
+ }
+ }
+ } else {
+ temp=dest;
+ }
+
+ destLength=0;
+
+ if(toWhichCase==FOLD_CASE) {
+ destLength=ustr_foldCase(csm->csp, temp, destCapacity, src, srcLength,
+ csm->options, pErrorCode);
+ } else {
+ UCaseContext csc={ NULL };
+
+ csc.p=(void *)src;
+ csc.limit=srcLength;
+
+ if(toWhichCase==TO_LOWER) {
+ destLength=_caseMap(csm, ucase_toFullLower,
+ temp, destCapacity,
+ src, &csc,
+ 0, srcLength,
+ pErrorCode);
+ } else if(toWhichCase==TO_UPPER) {
+ destLength=_caseMap(csm, ucase_toFullUpper,
+ temp, destCapacity,
+ src, &csc,
+ 0, srcLength,
+ pErrorCode);
+ } else /* if(toWhichCase==TO_TITLE) */ {
+#if UCONFIG_NO_BREAK_ITERATION
+ *pErrorCode=U_UNSUPPORTED_ERROR;
+#else
+ /* UCaseMap is actually non-const in toTitle() APIs. */
+ destLength=_toTitle((UCaseMap *)csm, temp, destCapacity,
+ src, &csc, srcLength,
+ pErrorCode);
+#endif
+ }
+ }
+ if(temp!=dest) {
+ /* copy the result string to the destination buffer */
+ if(destLength>0) {
+ int32_t copyLength= destLength<=destCapacity ? destLength : destCapacity;
+ if(copyLength>0) {
+ uprv_memmove(dest, temp, copyLength*U_SIZEOF_UCHAR);
+ }
+ }
+ if(temp!=buffer) {
+ uprv_free(temp);
+ }
+ }
+
+ return u_terminateUChars(dest, destCapacity, destLength, pErrorCode);
+}
+
+/* public API functions */
+
+U_CAPI int32_t U_EXPORT2
+u_strToLower(UChar *dest, int32_t destCapacity,
+ const UChar *src, int32_t srcLength,
+ const char *locale,
+ UErrorCode *pErrorCode) {
+ UCaseMap csm={ NULL };
+ setTempCaseMap(&csm, locale, pErrorCode);
+ return caseMap(&csm,
+ dest, destCapacity,
+ src, srcLength,
+ TO_LOWER, pErrorCode);
+}
+
+U_CAPI int32_t U_EXPORT2
+u_strToUpper(UChar *dest, int32_t destCapacity,
+ const UChar *src, int32_t srcLength,
+ const char *locale,
+ UErrorCode *pErrorCode) {
+ UCaseMap csm={ NULL };
+ setTempCaseMap(&csm, locale, pErrorCode);
+ return caseMap(&csm,
+ dest, destCapacity,
+ src, srcLength,
+ TO_UPPER, pErrorCode);
+}
+
+#if !UCONFIG_NO_BREAK_ITERATION
+
+U_CAPI int32_t U_EXPORT2
+u_strToTitle(UChar *dest, int32_t destCapacity,
+ const UChar *src, int32_t srcLength,
+ UBreakIterator *titleIter,
+ const char *locale,
+ UErrorCode *pErrorCode) {
+ UCaseMap csm={ NULL };
+ int32_t length;
+
+ csm.iter=titleIter;
+ setTempCaseMap(&csm, locale, pErrorCode);
+ length=caseMap(&csm,
+ dest, destCapacity,
+ src, srcLength,
+ TO_TITLE, pErrorCode);
+ if(titleIter==NULL && csm.iter!=NULL) {
+ ubrk_close(csm.iter);
+ }
+ return length;
+}
+
+U_CAPI int32_t U_EXPORT2
+ucasemap_toTitle(UCaseMap *csm,
+ UChar *dest, int32_t destCapacity,
+ const UChar *src, int32_t srcLength,
+ UErrorCode *pErrorCode) {
+ return caseMap(csm,
+ dest, destCapacity,
+ src, srcLength,
+ TO_TITLE, pErrorCode);
+}
+
+#endif
+
+U_CAPI int32_t U_EXPORT2
+u_strFoldCase(UChar *dest, int32_t destCapacity,
+ const UChar *src, int32_t srcLength,
+ uint32_t options,
+ UErrorCode *pErrorCode) {
+ UCaseMap csm={ NULL };
+ csm.csp=ucase_getSingleton(pErrorCode);
+ csm.options=options;
+ return caseMap(&csm,
+ dest, destCapacity,
+ src, srcLength,
+ FOLD_CASE, pErrorCode);
+}
+
+/* case-insensitive string comparisons -------------------------------------- */
+
+/*
+ * This function is a copy of unorm_cmpEquivFold() minus the parts for
+ * canonical equivalence.
+ * Keep the functions in sync, and see there for how this works.
+ * The duplication is for modularization:
+ * It makes caseless (but not canonical caseless) matches independent of
+ * the normalization code.
+ */
+
+/* stack element for previous-level source/decomposition pointers */
+struct CmpEquivLevel {
+ const UChar *start, *s, *limit;
+};
+typedef struct CmpEquivLevel CmpEquivLevel;
+
+/* internal function */
+U_CFUNC int32_t
+u_strcmpFold(const UChar *s1, int32_t length1,
+ const UChar *s2, int32_t length2,
+ uint32_t options,
+ UErrorCode *pErrorCode) {
+ const UCaseProps *csp;
+
+ /* current-level start/limit - s1/s2 as current */
+ const UChar *start1, *start2, *limit1, *limit2;
+
+ /* case folding variables */
+ const UChar *p;
+ int32_t length;
+
+ /* stacks of previous-level start/current/limit */
+ CmpEquivLevel stack1[2], stack2[2];
+
+ /* case folding buffers, only use current-level start/limit */
+ UChar fold1[UCASE_MAX_STRING_LENGTH+1], fold2[UCASE_MAX_STRING_LENGTH+1];
+
+ /* track which is the current level per string */
+ int32_t level1, level2;
+
+ /* current code units, and code points for lookups */
+ UChar32 c1, c2, cp1, cp2;
+
+ /* no argument error checking because this itself is not an API */
+
+ /*
+ * assume that at least the option U_COMPARE_IGNORE_CASE is set
+ * otherwise this function would have to behave exactly as uprv_strCompare()
+ */
+ csp=ucase_getSingleton(pErrorCode);
+ if(U_FAILURE(*pErrorCode)) {
+ return 0;
+ }
+
+ /* initialize */
+ start1=s1;
+ if(length1==-1) {
+ limit1=NULL;
+ } else {
+ limit1=s1+length1;
+ }
+
+ start2=s2;
+ if(length2==-1) {
+ limit2=NULL;
+ } else {
+ limit2=s2+length2;
+ }
+
+ level1=level2=0;
+ c1=c2=-1;
+
+ /* comparison loop */
+ for(;;) {
+ /*
+ * here a code unit value of -1 means "get another code unit"
+ * below it will mean "this source is finished"
+ */
+
+ if(c1<0) {
+ /* get next code unit from string 1, post-increment */
+ for(;;) {
+ if(s1==limit1 || ((c1=*s1)==0 && (limit1==NULL || (options&_STRNCMP_STYLE)))) {
+ if(level1==0) {
+ c1=-1;
+ break;
+ }
+ } else {
+ ++s1;
+ break;
+ }
+
+ /* reached end of level buffer, pop one level */
+ do {
+ --level1;
+ start1=stack1[level1].start;
+ } while(start1==NULL);
+ s1=stack1[level1].s;
+ limit1=stack1[level1].limit;
+ }
+ }
+
+ if(c2<0) {
+ /* get next code unit from string 2, post-increment */
+ for(;;) {
+ if(s2==limit2 || ((c2=*s2)==0 && (limit2==NULL || (options&_STRNCMP_STYLE)))) {
+ if(level2==0) {
+ c2=-1;
+ break;
+ }
+ } else {
+ ++s2;
+ break;
+ }
+
+ /* reached end of level buffer, pop one level */
+ do {
+ --level2;
+ start2=stack2[level2].start;
+ } while(start2==NULL);
+ s2=stack2[level2].s;
+ limit2=stack2[level2].limit;
+ }
+ }
+
+ /*
+ * compare c1 and c2
+ * either variable c1, c2 is -1 only if the corresponding string is finished
+ */
+ if(c1==c2) {
+ if(c1<0) {
+ return 0; /* c1==c2==-1 indicating end of strings */
+ }
+ c1=c2=-1; /* make us fetch new code units */
+ continue;
+ } else if(c1<0) {
+ return -1; /* string 1 ends before string 2 */
+ } else if(c2<0) {
+ return 1; /* string 2 ends before string 1 */
+ }
+ /* c1!=c2 && c1>=0 && c2>=0 */
+
+ /* get complete code points for c1, c2 for lookups if either is a surrogate */
+ cp1=c1;
+ if(U_IS_SURROGATE(c1)) {
+ UChar c;
+
+ if(U_IS_SURROGATE_LEAD(c1)) {
+ if(s1!=limit1 && U16_IS_TRAIL(c=*s1)) {
+ /* advance ++s1; only below if cp1 decomposes/case-folds */
+ cp1=U16_GET_SUPPLEMENTARY(c1, c);
+ }
+ } else /* isTrail(c1) */ {
+ if(start1<=(s1-2) && U16_IS_LEAD(c=*(s1-2))) {
+ cp1=U16_GET_SUPPLEMENTARY(c, c1);
+ }
+ }
+ }
+
+ cp2=c2;
+ if(U_IS_SURROGATE(c2)) {
+ UChar c;
+
+ if(U_IS_SURROGATE_LEAD(c2)) {
+ if(s2!=limit2 && U16_IS_TRAIL(c=*s2)) {
+ /* advance ++s2; only below if cp2 decomposes/case-folds */
+ cp2=U16_GET_SUPPLEMENTARY(c2, c);
+ }
+ } else /* isTrail(c2) */ {
+ if(start2<=(s2-2) && U16_IS_LEAD(c=*(s2-2))) {
+ cp2=U16_GET_SUPPLEMENTARY(c, c2);
+ }
+ }
+ }
+
+ /*
+ * go down one level for each string
+ * continue with the main loop as soon as there is a real change
+ */
+
+ if( level1==0 &&
+ (length=ucase_toFullFolding(csp, (UChar32)cp1, &p, options))>=0
+ ) {
+ /* cp1 case-folds to the code point "length" or to p[length] */
+ if(U_IS_SURROGATE(c1)) {
+ if(U_IS_SURROGATE_LEAD(c1)) {
+ /* advance beyond source surrogate pair if it case-folds */
+ ++s1;
+ } else /* isTrail(c1) */ {
+ /*
+ * we got a supplementary code point when hitting its trail surrogate,
+ * therefore the lead surrogate must have been the same as in the other string;
+ * compare this decomposition with the lead surrogate in the other string
+ * remember that this simulates bulk text replacement:
+ * the decomposition would replace the entire code point
+ */
+ --s2;
+ c2=*(s2-1);
+ }
+ }
+
+ /* push current level pointers */
+ stack1[0].start=start1;
+ stack1[0].s=s1;
+ stack1[0].limit=limit1;
+ ++level1;
+
+ /* copy the folding result to fold1[] */
+ if(length<=UCASE_MAX_STRING_LENGTH) {
+ u_memcpy(fold1, p, length);
+ } else {
+ int32_t i=0;
+ U16_APPEND_UNSAFE(fold1, i, length);
+ length=i;
+ }
+
+ /* set next level pointers to case folding */
+ start1=s1=fold1;
+ limit1=fold1+length;
+
+ /* get ready to read from decomposition, continue with loop */
+ c1=-1;
+ continue;
+ }
+
+ if( level2==0 &&
+ (length=ucase_toFullFolding(csp, (UChar32)cp2, &p, options))>=0
+ ) {
+ /* cp2 case-folds to the code point "length" or to p[length] */
+ if(U_IS_SURROGATE(c2)) {
+ if(U_IS_SURROGATE_LEAD(c2)) {
+ /* advance beyond source surrogate pair if it case-folds */
+ ++s2;
+ } else /* isTrail(c2) */ {
+ /*
+ * we got a supplementary code point when hitting its trail surrogate,
+ * therefore the lead surrogate must have been the same as in the other string;
+ * compare this decomposition with the lead surrogate in the other string
+ * remember that this simulates bulk text replacement:
+ * the decomposition would replace the entire code point
+ */
+ --s1;
+ c1=*(s1-1);
+ }
+ }
+
+ /* push current level pointers */
+ stack2[0].start=start2;
+ stack2[0].s=s2;
+ stack2[0].limit=limit2;
+ ++level2;
+
+ /* copy the folding result to fold2[] */
+ if(length<=UCASE_MAX_STRING_LENGTH) {
+ u_memcpy(fold2, p, length);
+ } else {
+ int32_t i=0;
+ U16_APPEND_UNSAFE(fold2, i, length);
+ length=i;
+ }
+
+ /* set next level pointers to case folding */
+ start2=s2=fold2;
+ limit2=fold2+length;
+
+ /* get ready to read from decomposition, continue with loop */
+ c2=-1;
+ continue;
+ }
+
+ /*
+ * no decomposition/case folding, max level for both sides:
+ * return difference result
+ *
+ * code point order comparison must not just return cp1-cp2
+ * because when single surrogates are present then the surrogate pairs
+ * that formed cp1 and cp2 may be from different string indexes
+ *
+ * example: { d800 d800 dc01 } vs. { d800 dc00 }, compare at second code units
+ * c1=d800 cp1=10001 c2=dc00 cp2=10000
+ * cp1-cp2>0 but c1-c2<0 and in fact in UTF-32 it is { d800 10001 } < { 10000 }
+ *
+ * therefore, use same fix-up as in ustring.c/uprv_strCompare()
+ * except: uprv_strCompare() fetches c=*s while this functions fetches c=*s++
+ * so we have slightly different pointer/start/limit comparisons here
+ */
+
+ if(c1>=0xd800 && c2>=0xd800 && (options&U_COMPARE_CODE_POINT_ORDER)) {
+ /* subtract 0x2800 from BMP code points to make them smaller than supplementary ones */
+ if(
+ (c1<=0xdbff && s1!=limit1 && U16_IS_TRAIL(*s1)) ||
+ (U16_IS_TRAIL(c1) && start1!=(s1-1) && U16_IS_LEAD(*(s1-2)))
+ ) {
+ /* part of a surrogate pair, leave >=d800 */
+ } else {
+ /* BMP code point - may be surrogate code point - make <d800 */
+ c1-=0x2800;
+ }
+
+ if(
+ (c2<=0xdbff && s2!=limit2 && U16_IS_TRAIL(*s2)) ||
+ (U16_IS_TRAIL(c2) && start2!=(s2-1) && U16_IS_LEAD(*(s2-2)))
+ ) {
+ /* part of a surrogate pair, leave >=d800 */
+ } else {
+ /* BMP code point - may be surrogate code point - make <d800 */
+ c2-=0x2800;
+ }
+ }
+
+ return c1-c2;
+ }
+}
+
+/* public API functions */
+
+U_CAPI int32_t U_EXPORT2
+u_strCaseCompare(const UChar *s1, int32_t length1,
+ const UChar *s2, int32_t length2,
+ uint32_t options,
+ UErrorCode *pErrorCode) {
+ /* argument checking */
+ if(pErrorCode==0 || U_FAILURE(*pErrorCode)) {
+ return 0;
+ }
+ if(s1==NULL || length1<-1 || s2==NULL || length2<-1) {
+ *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
+ return 0;
+ }
+ return u_strcmpFold(s1, length1, s2, length2,
+ options|U_COMPARE_IGNORE_CASE,
+ pErrorCode);
+}
+
+U_CAPI int32_t U_EXPORT2
+u_strcasecmp(const UChar *s1, const UChar *s2, uint32_t options) {
+ UErrorCode errorCode=U_ZERO_ERROR;
+ return u_strcmpFold(s1, -1, s2, -1,
+ options|U_COMPARE_IGNORE_CASE,
+ &errorCode);
+}
+
+U_CAPI int32_t U_EXPORT2
+u_memcasecmp(const UChar *s1, const UChar *s2, int32_t length, uint32_t options) {
+ UErrorCode errorCode=U_ZERO_ERROR;
+ return u_strcmpFold(s1, length, s2, length,
+ options|U_COMPARE_IGNORE_CASE,
+ &errorCode);
+}
+
+U_CAPI int32_t U_EXPORT2
+u_strncasecmp(const UChar *s1, const UChar *s2, int32_t n, uint32_t options) {
+ UErrorCode errorCode=U_ZERO_ERROR;
+ return u_strcmpFold(s1, n, s2, n,
+ options|(U_COMPARE_IGNORE_CASE|_STRNCMP_STYLE),
+ &errorCode);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 19:57:54 +0000