C API: Unicode case mapping functions using a UCaseMap service object. More...

#include "unicode/utypes.h"
#include "unicode/localpointer.h"
#include "unicode/stringoptions.h"
#include "unicode/ustring.h"

Namespaces
	icu
	File coll.h.

Typedefs
typedef struct UCaseMap	UCaseMap
	C typedef for struct UCaseMap. More...

Functions
UCaseMap *	ucasemap_open (const char locale, uint32_t options, UErrorCode pErrorCode)
	Open a UCaseMap service object for a locale and a set of options. More...

void	ucasemap_close (UCaseMap *csm)
	Close a UCaseMap service object. More...

const char *	ucasemap_getLocale (const UCaseMap *csm)
	Get the locale ID that is used for language-dependent case mappings. More...

uint32_t	ucasemap_getOptions (const UCaseMap *csm)
	Get the options bit set that is used for case folding and string comparisons. More...

void	ucasemap_setLocale (UCaseMap csm, const char locale, UErrorCode *pErrorCode)
	Set the locale ID that is used for language-dependent case mappings. More...

void	ucasemap_setOptions (UCaseMap csm, uint32_t options, UErrorCode pErrorCode)
	Set the options bit set that is used for case folding and string comparisons. More...

const UBreakIterator *	ucasemap_getBreakIterator (const UCaseMap *csm)
	Get the break iterator that is used for titlecasing. More...

void	ucasemap_setBreakIterator (UCaseMap csm, UBreakIterator iterToAdopt, UErrorCode *pErrorCode)
	Set the break iterator that is used for titlecasing. More...

int32_t	ucasemap_toTitle (UCaseMap csm, UChar dest, int32_t destCapacity, const UChar src, int32_t srcLength, UErrorCode pErrorCode)
	Titlecase a UTF-16 string. More...

int32_t	ucasemap_utf8ToLower (const UCaseMap csm, char dest, int32_t destCapacity, const char src, int32_t srcLength, UErrorCode pErrorCode)
	Lowercase the characters in a UTF-8 string. More...

int32_t	ucasemap_utf8ToUpper (const UCaseMap csm, char dest, int32_t destCapacity, const char src, int32_t srcLength, UErrorCode pErrorCode)
	Uppercase the characters in a UTF-8 string. More...

int32_t	ucasemap_utf8ToTitle (UCaseMap csm, char dest, int32_t destCapacity, const char src, int32_t srcLength, UErrorCode pErrorCode)
	Titlecase a UTF-8 string. More...

int32_t	ucasemap_utf8FoldCase (const UCaseMap csm, char dest, int32_t destCapacity, const char src, int32_t srcLength, UErrorCode pErrorCode)
	Case-folds the characters in a UTF-8 string. More...

Detailed Description

C API: Unicode case mapping functions using a UCaseMap service object.

The service object takes care of memory allocations, data loading, and setup for the attributes, as usual.

Currently, the functionality provided here does not overlap with uchar.h and ustring.h, except for ucasemap_toTitle().

ucasemap_utf8XYZ() functions operate directly on UTF-8 strings.

Definition in file ucasemap.h.

Typedef Documentation

◆ UCaseMap

typedef struct UCaseMap UCaseMap

C typedef for struct UCaseMap.

Stable:: ICU 3.4

Definition at line 48 of file ucasemap.h.

Function Documentation

◆ ucasemap_close()

void ucasemap_close ( UCaseMap * csm )

Close a UCaseMap service object.

Parameters

csm	Object to be closed.

Stable:: ICU 3.4

◆ ucasemap_getBreakIterator()

const UBreakIterator* ucasemap_getBreakIterator ( const UCaseMap * csm )

Get the break iterator that is used for titlecasing.

Do not modify the returned break iterator.

Parameters

csm	UCaseMap service object.

Returns: titlecasing break iterator

Stable:: ICU 3.8

◆ ucasemap_getLocale()

const char* ucasemap_getLocale ( const UCaseMap * csm )

Get the locale ID that is used for language-dependent case mappings.

Parameters

csm	UCaseMap service object.

Returns: locale ID

Stable:: ICU 3.4

◆ ucasemap_getOptions()

uint32_t ucasemap_getOptions ( const UCaseMap * csm )

Get the options bit set that is used for case folding and string comparisons.

Parameters

csm	UCaseMap service object.

Returns: options bit set

Stable:: ICU 3.4

◆ ucasemap_open()

UCaseMap* ucasemap_open	(	const char *	locale,
		uint32_t	options,
		UErrorCode *	pErrorCode
	)

Open a UCaseMap service object for a locale and a set of options.

The locale ID and options are preprocessed so that functions using the service object need not process them in each call.

Parameters

locale	ICU locale ID, used for language-dependent upper-/lower-/title-casing according to the Unicode standard. Usual semantics: ""=root, NULL=default locale, etc.
options	Options bit set, used for case folding and string comparisons. Same flags as for u_foldCase(), u_strFoldCase(), u_strCaseCompare(), etc. Use 0 or U_FOLD_CASE_DEFAULT for default behavior.
pErrorCode	Must be a valid pointer to an error code value, which must not indicate a failure before the function call.

Returns: Pointer to a UCaseMap service object, if successful.

See also: U_FOLD_CASE_DEFAULT; U_FOLD_CASE_EXCLUDE_SPECIAL_I; U_TITLECASE_NO_LOWERCASE; U_TITLECASE_NO_BREAK_ADJUSTMENT

Stable:: ICU 3.4

◆ ucasemap_setBreakIterator()

void ucasemap_setBreakIterator	(	UCaseMap *	csm,
		UBreakIterator *	iterToAdopt,
		UErrorCode *	pErrorCode
	)

Set the break iterator that is used for titlecasing.

The UCaseMap service object releases a previously set break iterator and "adopts" this new one, taking ownership of it. It will be released in a subsequent call to ucasemap_setBreakIterator() or ucasemap_close().

Break iterator operations are not thread-safe. Therefore, titlecasing functions use non-const UCaseMap objects. It is not possible to titlecase strings concurrently using the same UCaseMap.

Parameters

csm	UCaseMap service object.
iterToAdopt	Break iterator to be adopted for titlecasing.
pErrorCode	Must be a valid pointer to an error code value, which must not indicate a failure before the function call.

See also: ucasemap_toTitle; ucasemap_utf8ToTitle

Stable:: ICU 3.8

◆ ucasemap_setLocale()

void ucasemap_setLocale	(	UCaseMap *	csm,
		const char *	locale,
		UErrorCode *	pErrorCode
	)

Set the locale ID that is used for language-dependent case mappings.

Parameters

csm	UCaseMap service object.
locale	Locale ID, see ucasemap_open().
pErrorCode	Must be a valid pointer to an error code value, which must not indicate a failure before the function call.

See also: ucasemap_open

Stable:: ICU 3.4

◆ ucasemap_setOptions()

void ucasemap_setOptions	(	UCaseMap *	csm,
		uint32_t	options,
		UErrorCode *	pErrorCode
	)

Set the options bit set that is used for case folding and string comparisons.

Parameters

csm	UCaseMap service object.
options	Options bit set, see ucasemap_open().
pErrorCode	Must be a valid pointer to an error code value, which must not indicate a failure before the function call.

See also: ucasemap_open

Stable:: ICU 3.4

◆ ucasemap_toTitle()

int32_t ucasemap_toTitle	(	UCaseMap *	csm,
		UChar *	dest,
		int32_t	destCapacity,
		const UChar *	src,
		int32_t	srcLength,
		UErrorCode *	pErrorCode
	)

Titlecase a UTF-16 string.

This function is almost a duplicate of u_strToTitle(), except that it takes ucasemap_setOptions() into account and has performance advantages from being able to use a UCaseMap object for multiple case mapping operations, saving setup time.

Casing is locale-dependent and context-sensitive. Titlecasing uses a break iterator to find the first characters of words that are to be titlecased. It titlecases those characters and lowercases all others. (This can be modified with ucasemap_setOptions().)

Note: This function takes a non-const UCaseMap pointer because it will open a default break iterator if no break iterator was set yet, and effectively call ucasemap_setBreakIterator(); also because the break iterator is stateful and will be modified during the iteration.

The titlecase break iterator can be provided to customize for arbitrary styles, using rules and dictionaries beyond the standard iterators. The standard titlecase iterator for the root locale implements the algorithm of Unicode TR 21.

This function uses only the setText(), first() and next() methods of the provided break iterator.

The result may be longer or shorter than the original. The source string and the destination buffer must not overlap.

Parameters

csm	UCaseMap service object. This pointer is non-const! See the note above for details.
dest	A buffer for the result string. The result will be NUL-terminated if the buffer is large enough. The contents is undefined in case of failure.
destCapacity	The size of the buffer (number of UChars). If it is 0, then dest may be NULL and the function will only return the length of the result without writing any of the result string.
src	The original string.
srcLength	The length of the original string. If -1, then src must be NUL-terminated.
pErrorCode	Must be a valid pointer to an error code value, which must not indicate a failure before the function call.

Returns: The length of the result string, if successful - or in case of a buffer overflow, in which case it will be greater than destCapacity.

See also: u_strToTitle

Stable:: ICU 3.8

◆ ucasemap_utf8FoldCase()

int32_t ucasemap_utf8FoldCase	(	const UCaseMap *	csm,
		char *	dest,
		int32_t	destCapacity,
		const char *	src,
		int32_t	srcLength,
		UErrorCode *	pErrorCode
	)

Case-folds the characters in a UTF-8 string.

Case-folding is locale-independent and not context-sensitive, but there is an option for whether to include or exclude mappings for dotted I and dotless i that are marked with 'T' in CaseFolding.txt.

The result may be longer or shorter than the original. The source string and the destination buffer must not overlap.

Parameters

csm	UCaseMap service object.
dest	A buffer for the result string. The result will be NUL-terminated if the buffer is large enough. The contents is undefined in case of failure.
destCapacity	The size of the buffer (number of bytes). If it is 0, then dest may be NULL and the function will only return the length of the result without writing any of the result string.
src	The original string.
srcLength	The length of the original string. If -1, then src must be NUL-terminated.
pErrorCode	Must be a valid pointer to an error code value, which must not indicate a failure before the function call.

Returns: The length of the result string, if successful - or in case of a buffer overflow, in which case it will be greater than destCapacity.

See also: u_strFoldCase; ucasemap_setOptions; U_FOLD_CASE_DEFAULT; U_FOLD_CASE_EXCLUDE_SPECIAL_I

Stable:: ICU 3.8

◆ ucasemap_utf8ToLower()

int32_t ucasemap_utf8ToLower	(	const UCaseMap *	csm,
		char *	dest,
		int32_t	destCapacity,
		const char *	src,
		int32_t	srcLength,
		UErrorCode *	pErrorCode
	)

Lowercase the characters in a UTF-8 string.

Casing is locale-dependent and context-sensitive. The result may be longer or shorter than the original. The source string and the destination buffer must not overlap.

Parameters

csm	UCaseMap service object.
dest	A buffer for the result string. The result will be NUL-terminated if the buffer is large enough. The contents is undefined in case of failure.
destCapacity	The size of the buffer (number of bytes). If it is 0, then dest may be NULL and the function will only return the length of the result without writing any of the result string.
src	The original string.
srcLength	The length of the original string. If -1, then src must be NUL-terminated.
pErrorCode	Must be a valid pointer to an error code value, which must not indicate a failure before the function call.

Returns: The length of the result string, if successful - or in case of a buffer overflow, in which case it will be greater than destCapacity.

See also: u_strToLower

Stable:: ICU 3.4

◆ ucasemap_utf8ToTitle()

int32_t ucasemap_utf8ToTitle	(	UCaseMap *	csm,
		char *	dest,
		int32_t	destCapacity,
		const char *	src,
		int32_t	srcLength,
		UErrorCode *	pErrorCode
	)

Titlecase a UTF-8 string.

Casing is locale-dependent and context-sensitive. Titlecasing uses a break iterator to find the first characters of words that are to be titlecased. It titlecases those characters and lowercases all others. (This can be modified with ucasemap_setOptions().)

Note: This function takes a non-const UCaseMap pointer because it will open a default break iterator if no break iterator was set yet, and effectively call ucasemap_setBreakIterator(); also because the break iterator is stateful and will be modified during the iteration.

The titlecase break iterator can be provided to customize for arbitrary styles, using rules and dictionaries beyond the standard iterators. The standard titlecase iterator for the root locale implements the algorithm of Unicode TR 21.

This function uses only the setUText(), first(), next() and close() methods of the provided break iterator.

The result may be longer or shorter than the original. The source string and the destination buffer must not overlap.

Parameters

csm	UCaseMap service object. This pointer is non-const! See the note above for details.
dest	A buffer for the result string. The result will be NUL-terminated if the buffer is large enough. The contents is undefined in case of failure.
destCapacity	The size of the buffer (number of bytes). If it is 0, then dest may be NULL and the function will only return the length of the result without writing any of the result string.
src	The original string.
srcLength	The length of the original string. If -1, then src must be NUL-terminated.
pErrorCode	Must be a valid pointer to an error code value, which must not indicate a failure before the function call.

Returns: The length of the result string, if successful - or in case of a buffer overflow, in which case it will be greater than destCapacity.

See also: u_strToTitle; U_TITLECASE_NO_LOWERCASE; U_TITLECASE_NO_BREAK_ADJUSTMENT

Stable:: ICU 3.8

◆ ucasemap_utf8ToUpper()

int32_t ucasemap_utf8ToUpper	(	const UCaseMap *	csm,
		char *	dest,
		int32_t	destCapacity,
		const char *	src,
		int32_t	srcLength,
		UErrorCode *	pErrorCode
	)

Uppercase the characters in a UTF-8 string.

Casing is locale-dependent and context-sensitive. The result may be longer or shorter than the original. The source string and the destination buffer must not overlap.

Parameters

csm	UCaseMap service object.
dest	A buffer for the result string. The result will be NUL-terminated if the buffer is large enough. The contents is undefined in case of failure.
destCapacity	The size of the buffer (number of bytes). If it is 0, then dest may be NULL and the function will only return the length of the result without writing any of the result string.
src	The original string.
srcLength	The length of the original string. If -1, then src must be NUL-terminated.
pErrorCode	Must be a valid pointer to an error code value, which must not indicate a failure before the function call.

Returns: The length of the result string, if successful - or in case of a buffer overflow, in which case it will be greater than destCapacity.

See also: u_strToUpper

Stable:: ICU 3.4

Namespaces

Typedefs

Functions

Detailed Description

Typedef Documentation

◆ UCaseMap

Function Documentation

◆ ucasemap_close()

◆ ucasemap_getBreakIterator()

◆ ucasemap_getLocale()

◆ ucasemap_getOptions()

◆ ucasemap_open()

◆ ucasemap_setBreakIterator()

◆ ucasemap_setLocale()

◆ ucasemap_setOptions()

◆ ucasemap_toTitle()

◆ ucasemap_utf8FoldCase()

◆ ucasemap_utf8ToLower()

◆ ucasemap_utf8ToTitle()

◆ ucasemap_utf8ToUpper()