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scuffed-code/icu4c/source/common/unicode/ustring.h
Markus Scherer 3d38617bdc ICU-2248 modularize icu, allow parts to not be built 
X-SVN-Rev: 9900
2002-09-20 01:54:48 +00:00

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/*
**********************************************************************
* Copyright (C) 1998-2001, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
*
* File ustring.h
*
* Modification History:
*
* Date Name Description
* 12/07/98 bertrand Creation.
******************************************************************************
*/
#ifndef USTRING_H
#define USTRING_H
#include "unicode/utypes.h"
/** Simple declaration for u_strToTitle() to avoid including unicode/ubrk.h. */
#ifndef UBRK_TYPEDEF_UBREAK_ITERATOR
# define UBRK_TYPEDEF_UBREAK_ITERATOR
typedef void *UBreakIterator;
#endif
/**
* \file
* \brief C API: Unicode string handling functions
*
* These C API functions provide Unicode string handling.
*
* Some functions are equivalent in name, signature, and behavior to the ANSI C <string.h>
* functions. (For example, they do not check for bad arguments like NULL string pointers.)
* In some cases, only the thread-safe variant of such a function is implemented here
* (see u_strtok_r()).
*
* Other functions provide more Unicode-specific functionality like locale-specific
* upper/lower-casing and string comparison in code point order.
*
* ICU uses 16-bit Unicode (UTF-16) in the form of arrays of UChar code units.
* UTF-16 encodes each Unicode code point with either one or two UChar code units.
* Some APIs accept a 32-bit UChar32 value for a single code point.
* (This is the default form of Unicode, and a forward-compatible extension of the original,
* fixed-width form that was known as UCS-2. UTF-16 superseded UCS-2 with Unicode 2.0
* in 1996.)
*
* Although UTF-16 is a variable-width encoding form (like some legacy multi-byte encodings),
* it is much more efficient even for random access because the code unit values
* for single-unit characters vs. lead units vs. trail units are completely disjoint.
* This means that it is easy to determine character (code point) boundaries from
* random offsets in the string.
* (It also means, e.g., that u_strstr() does not need to verify that a match was
* found on actual character boundaries; with some legacy encodings, strstr() may need to
* scan back to the start of the text to verify this.)
*
* Unicode (UTF-16) string processing is optimized for the single-unit case.
* Although it is important to support supplementary characters
* (which use pairs of lead/trail code units called "surrogates"),
* their occurrence is rare. Almost all characters in modern use require only
* a single UChar code unit (i.e., their code point values are <=0xffff).
*/
/**
* Determine the length of an array of UChar.
*
* @param s The array of UChars, NULL (U+0000) terminated.
* @return The number of UChars in <TT>chars</TT>, minus the terminator.
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strlen(const UChar *s);
/**
* Count Unicode code points in the length UChar code units of the string.
* A code point may occupy either one or two UChar code units.
* Counting code points involves reading all code units.
*
* This functions is basically the inverse of the UTF_FWD_N() macro (see utf.h).
*
* @param s The input string.
* @param length The number of UChar code units to be checked, or -1 to count all
* code points before the first NUL (U+0000).
* @return The number of code points in the specified code units.
* @draft ICU 2.0
*/
U_CAPI int32_t U_EXPORT2
u_countChar32(const UChar *s, int32_t length);
/**
* Concatenate two ustrings. Appends a copy of <TT>src</TT>,
* including the null terminator, to <TT>dst</TT>. The initial copied
* character from <TT>src</TT> overwrites the null terminator in <TT>dst</TT>.
*
* @param dst The destination string.
* @param src The source string.
* @return A pointer to <TT>dst</TT>.
* @stable
*/
U_CAPI UChar* U_EXPORT2
u_strcat(UChar *dst,
const UChar *src);
/**
* Concatenate two ustrings.
* Appends at most <TT>n</TT> characters from <TT>src</TT> to <TT>dst</TT>.
* Adds a null terminator.
*
* @param dst The destination string.
* @param src The source string.
* @param n The maximum number of characters to compare.
* @return A pointer to <TT>dst</TT>.
* @stable
*/
U_CAPI UChar* U_EXPORT2
u_strncat(UChar *dst,
const UChar *src,
int32_t n);
/**
* Find the first occurrence of a specified character in a ustring.
*
* @param s The string to search.
* @param c The character to find.
* @return A pointer to the first occurrence of <TT>c</TT> in <TT>s</TT>,
* or a null pointer if <TT>s</TT> does not contain <TT>c</TT>.
* @stable
*/
U_CAPI UChar* U_EXPORT2
u_strchr(const UChar *s,
UChar c);
/**
* Find the first occurrence of a substring in a string.
*
* @param s The string to search.
* @param substring The substring to find
* @return A pointer to the first occurrence of <TT>substring</TT> in
* <TT>s</TT>, or a null pointer if <TT>substring</TT>
* is not in <TT>s</TT>.
* @stable
*/
U_CAPI UChar * U_EXPORT2
u_strstr(const UChar *s, const UChar *substring);
/**
* Find the first occurence of a specified code point in a string.
*
* This function finds code points, which differs for BMP code points
* from u_strchr() only for surrogates:
* While u_strchr() finds any surrogate code units in a string,
* u_strchr32() finds only unmatched surrogate code points,
* i.e., only those that do not combine with an adjacent surrogate
* to form a supplementary code point.
* For example, in a string "\ud800\udc00" u_strchr()
* will find code units U+d800 at 0 and U+dc00 at 1,
* but u_strchr32() will find neither because they
* combine to the code point U+10000.
* Either function will find U+d800 in "a\ud800b".
* This behavior ensures that UTF_GET_CHAR(u_strchr32(c))==c.
*
* @param s The string to search.
* @param c The code point (0..0x10ffff) to find.
* @return A pointer to the first occurrence of <TT>c</TT> in <TT>s</TT>,
* or a null pointer if there is no such character.
* If <TT>c</TT> is represented with several UChars, then the returned
* pointer will point to the first of them.
* @stable
*/
U_CAPI UChar * U_EXPORT2
u_strchr32(const UChar *s, UChar32 c);
/**
* Locates the first occurrence in the string str of any of the characters
* in the string accept.
* Works just like C's strpbrk but with Unicode.
*
* @return A pointer to the character in str that matches one of the
* characters in accept, or NULL if no such character is found.
* @stable
*/
U_CAPI UChar * U_EXPORT2
u_strpbrk(const UChar *string, const UChar *matchSet);
/**
* Returns the number of consecutive characters in string1,
* beginning with the first, that do not occur somewhere in string2.
* Works just like C's strcspn but with Unicode.
*
* @see u_strspn
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strcspn(const UChar *string, const UChar *matchSet);
/**
* Returns the number of consecutive characters in string1,
* beginning with the first, that occur somewhere in string2.
* Works just like C's strspn but with Unicode.
*
* @see u_strcspn
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strspn(const UChar *string, const UChar *matchSet);
/**
* The string tokenizer API allows an application to break a string into
* tokens. Unlike strtok(), the saveState (the current pointer within the
* original string) is maintained in saveState. In the first call, the
* argument src is a pointer to the string. In subsequent calls to
* return successive tokens of that string, src must be specified as
* NULL. The value saveState is set by this function to maintain the
* function's position within the string, and on each subsequent call
* you must give this argument the same variable. This function does
* handle surrogate pairs. This function is similar to the strtok_r()
* the POSIX Threads Extension (1003.1c-1995) version.
*
* @param src String containing token(s). This string will be modified.
* After the first call to u_strtok_r(), this argument must
* be NULL to get to the next token.
* @param delim Set of delimiter characters (Unicode code points).
* @param saveState The current pointer within the original string,
* which is set by this function. The saveState
* parameter should the address of a local variable of type
* UChar *. (i.e. defined "Uhar *myLocalSaveState" and use
* &myLocalSaveState for this parameter).
* @return A pointer to the next token found in src, or NULL
* when there are no more tokens.
* @stable
*/
U_CAPI UChar * U_EXPORT2
u_strtok_r(UChar *src,
const UChar *delim,
UChar **saveState);
/**
* Compare two Unicode strings for bitwise equality (code unit order).
*
* @param s1 A string to compare.
* @param s2 A string to compare.
* @return 0 if <TT>s1</TT> and <TT>s2</TT> are bitwise equal; a negative
* value if <TT>s1</TT> is bitwise less than <TT>s2,/TT>; a positive
* value if <TT>s1</TT> is bitwise greater than <TT>s2,/TT>.
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strcmp(const UChar *s1,
const UChar *s2);
/**
* Compare two Unicode strings in code point order.
* See u_strCompare for details.
*
* @param s1 A string to compare.
* @param s2 A string to compare.
* @return a negative/zero/positive integer corresponding to whether
* the first string is less than/equal to/greater than the second one
* in code point order
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strcmpCodePointOrder(const UChar *s1, const UChar *s2);
/**
* Compare two Unicode strings (binary order).
*
* The comparison can be done in code unit order or in code point order.
* They differ only in UTF-16 when
* comparing supplementary code points (U+10000..U+10ffff)
* to BMP code points near the end of the BMP (i.e., U+e000..U+ffff).
* In code unit order, high BMP code points sort after supplementary code points
* because they are stored as pairs of surrogates which are at U+d800..U+dfff.
*
* This functions works with strings of different explicitly specified lengths
* unlike the ANSI C-like u_strcmp() and u_memcmp() etc.
* NUL-terminated strings are possible with length arguments of -1.
*
* @param s1 First source string.
* @param length1 Length of first source string, or -1 if NUL-terminated.
*
* @param s2 Second source string.
* @param length2 Length of second source string, or -1 if NUL-terminated.
*
* @param codePointOrder Choose between code unit order (FALSE)
* and code point order (TRUE).
*
* @return <0 or 0 or >0 as usual for string comparisons
*
* @draft ICU 2.2
*/
U_CAPI int32_t U_EXPORT2
u_strCompare(const UChar *s1, int32_t length1,
const UChar *s2, int32_t length2,
UBool codePointOrder);
#ifndef U_COMPARE_CODE_POINT_ORDER
/* see also unistr.h and unorm.h */
/**
* Option bit for u_strCaseCompare, u_strcasecmp, unorm_compare, etc:
* Compare strings in code point order instead of code unit order.
* @draft ICU 2.2
*/
#define U_COMPARE_CODE_POINT_ORDER 0x8000
#endif
/**
* Compare two strings case-insensitively using full case folding.
* This is equivalent to
* u_strCompare(u_strFoldCase(s1, options),
* u_strFoldCase(s2, options),
* (options&U_COMPARE_CODE_POINT_ORDER)!=0).
*
* The comparison can be done in UTF-16 code unit order or in code point order.
* They differ only when comparing supplementary code points (U+10000..U+10ffff)
* to BMP code points near the end of the BMP (i.e., U+e000..U+ffff).
* In code unit order, high BMP code points sort after supplementary code points
* because they are stored as pairs of surrogates which are at U+d800..U+dfff.
*
* This functions works with strings of different explicitly specified lengths
* unlike the ANSI C-like u_strcmp() and u_memcmp() etc.
* NUL-terminated strings are possible with length arguments of -1.
*
* @param s1 First source string.
* @param length1 Length of first source string, or -1 if NUL-terminated.
*
* @param s2 Second source string.
* @param length2 Length of second source string, or -1 if NUL-terminated.
*
* @param options A bit set of options:
* - U_FOLD_CASE_DEFAULT or 0 is used for default options:
* Comparison in code unit order with default case folding.
*
* - U_COMPARE_CODE_POINT_ORDER
* Set to choose code point order instead of code unit order
* (see u_strCompare for details).
*
* - U_FOLD_CASE_EXCLUDE_SPECIAL_I
*
* @return <0 or 0 or >0 as usual for string comparisons
*
* @draft ICU 2.2
*/
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);
/**
* Compare two ustrings for bitwise equality.
* Compares at most <TT>n</TT> characters.
*
* @param ucs1 A string to compare.
* @param ucs2 A string to compare.
* @param n The maximum number of characters to compare.
* @return 0 if <TT>s1</TT> and <TT>s2</TT> are bitwise equal; a negative
* value if <TT>s1</TT> is bitwise less than <TT>s2,/TT>; a positive
* value if <TT>s1</TT> is bitwise greater than <TT>s2,/TT>.
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strncmp(const UChar *ucs1,
const UChar *ucs2,
int32_t n);
/**
* Compare two Unicode strings in code point order.
* This is different in UTF-16 from u_strncmp() if supplementary characters are present.
* For details, see u_strCompare().
*
* @param s1 A string to compare.
* @param s2 A string to compare.
* @param n The maximum number of characters to compare.
* @return a negative/zero/positive integer corresponding to whether
* the first string is less than/equal to/greater than the second one
* in code point order
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strncmpCodePointOrder(const UChar *s1, const UChar *s2, int32_t n);
/**
* Compare two strings case-insensitively using full case folding.
* This is equivalent to u_strcmp(u_strFoldCase(s1, options), u_strFoldCase(s2, options)).
*
* @param s1 A string to compare.
* @param s2 A string to compare.
* @param options A bit set of options:
* - U_FOLD_CASE_DEFAULT or 0 is used for default options:
* Comparison in code unit order with default case folding.
*
* - U_COMPARE_CODE_POINT_ORDER
* Set to choose code point order instead of code unit order
* (see u_strCompare for details).
*
* - U_FOLD_CASE_EXCLUDE_SPECIAL_I
*
* @return A negative, zero, or positive integer indicating the comparison result.
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strcasecmp(const UChar *s1, const UChar *s2, uint32_t options);
/**
* Compare two strings case-insensitively using full case folding.
* This is equivalent to u_strcmp(u_strFoldCase(s1, at most n, options),
* u_strFoldCase(s2, at most n, options)).
*
* @param s1 A string to compare.
* @param s2 A string to compare.
* @param n The maximum number of characters each string to case-fold and then compare.
* @param options A bit set of options:
* - U_FOLD_CASE_DEFAULT or 0 is used for default options:
* Comparison in code unit order with default case folding.
*
* - U_COMPARE_CODE_POINT_ORDER
* Set to choose code point order instead of code unit order
* (see u_strCompare for details).
*
* - U_FOLD_CASE_EXCLUDE_SPECIAL_I
*
* @return A negative, zero, or positive integer indicating the comparison result.
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strncasecmp(const UChar *s1, const UChar *s2, int32_t n, uint32_t options);
/**
* Compare two strings case-insensitively using full case folding.
* This is equivalent to u_strcmp(u_strFoldCase(s1, n, options),
* u_strFoldCase(s2, n, options)).
*
* @param s1 A string to compare.
* @param s2 A string to compare.
* @param length The number of characters in each string to case-fold and then compare.
* @param options A bit set of options:
* - U_FOLD_CASE_DEFAULT or 0 is used for default options:
* Comparison in code unit order with default case folding.
*
* - U_COMPARE_CODE_POINT_ORDER
* Set to choose code point order instead of code unit order
* (see u_strCompare for details).
*
* - U_FOLD_CASE_EXCLUDE_SPECIAL_I
*
* @return A negative, zero, or positive integer indicating the comparison result.
* @draft ICU 2.0
*/
U_CAPI int32_t U_EXPORT2
u_memcasecmp(const UChar *s1, const UChar *s2, int32_t length, uint32_t options);
/**
* Copy a ustring. Adds a null terminator.
*
* @param dst The destination string.
* @param src The source string.
* @return A pointer to <TT>dst</TT>.
* @stable
*/
U_CAPI UChar* U_EXPORT2
u_strcpy(UChar *dst,
const UChar *src);
/**
* Copy a ustring.
* Copies at most <TT>n</TT> characters. The result will be null terminated
* if the length of <TT>src</TT> is less than <TT>n</TT>.
*
* @param dst The destination string.
* @param src The source string.
* @param n The maximum number of characters to copy.
* @return A pointer to <TT>dst</TT>.
* @stable
*/
U_CAPI UChar* U_EXPORT2
u_strncpy(UChar *dst,
const UChar *src,
int32_t n);
/**
* Copy a byte string encoded in the default codepage to a ustring.
* Adds a null terminator.
* Performs a host byte to UChar conversion
*
* @param dst The destination string.
* @param src The source string.
* @return A pointer to <TT>dst</TT>.
* @stable
*/
U_CAPI UChar* U_EXPORT2 u_uastrcpy(UChar *dst,
const char *src );
/**
* Copy a byte string encoded in the default codepage to a ustring.
* Copies at most <TT>n</TT> characters. The result will be null terminated
* if the length of <TT>src</TT> is less than <TT>n</TT>.
* Performs a host byte to UChar conversion
*
* @param dst The destination string.
* @param src The source string.
* @param n The maximum number of characters to copy.
* @return A pointer to <TT>dst</TT>.
* @stable
*/
U_CAPI UChar* U_EXPORT2 u_uastrncpy(UChar *dst,
const char *src,
int32_t n);
/**
* Copy ustring to a byte string encoded in the default codepage.
* Adds a null terminator.
* Performs a UChar to host byte conversion
*
* @param dst The destination string.
* @param src The source string.
* @return A pointer to <TT>dst</TT>.
* @stable
*/
U_CAPI char* U_EXPORT2 u_austrcpy(char *dst,
const UChar *src );
/**
* Copy ustring to a byte string encoded in the default codepage.
* Copies at most <TT>n</TT> characters. The result will be null terminated
* if the length of <TT>src</TT> is less than <TT>n</TT>.
* Performs a UChar to host byte conversion
*
* @param dst The destination string.
* @param src The source string.
* @param n The maximum number of characters to copy.
* @return A pointer to <TT>dst</TT>.
* @stable
*/
U_CAPI char* U_EXPORT2 u_austrncpy(char *dst,
const UChar *src,
int32_t n );
/**
* Synonym for memcpy(), but with UChars only.
* @param dest The destination string
* @param src The source string
* @param count The number of characters to copy
* @return A pointer to <TT>dest</TT>
* @stable
*/
U_CAPI UChar* U_EXPORT2
u_memcpy(UChar *dest, const UChar *src, int32_t count);
/**
* Synonym for memmove(), but with UChars only.
* @param dest The destination string
* @param src The source string
* @param count The number of characters to move
* @return A pointer to <TT>dest</TT>
* @stable
*/
U_CAPI UChar* U_EXPORT2
u_memmove(UChar *dest, const UChar *src, int32_t count);
/**
* Initialize <TT>count</TT> characters of <TT>dest</TT> to <TT>c</TT>.
*
* @param dest The destination string.
* @param c The character to initialize the string.
* @param count The maximum number of characters to set.
* @return A pointer to <TT>dest</TT>.
* @stable
*/
U_CAPI UChar* U_EXPORT2
u_memset(UChar *dest, UChar c, int32_t count);
/**
* Compare the first <TT>count</TT> UChars of each buffer.
*
* @param buf1 The first string to compare.
* @param buf2 The second string to compare.
* @param count The maximum number of UChars to compare.
* @return When buf1 < buf2, a negative number is returned.
* When buf1 == buf2, 0 is returned.
* When buf1 > buf2, a positive number is returned.
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_memcmp(const UChar *buf1, const UChar *buf2, int32_t count);
/**
* Compare two Unicode strings in code point order.
* This is different in UTF-16 from u_memcmp() if supplementary characters are present.
* For details, see u_strCompare().
*
* @param s1 A string to compare.
* @param s2 A string to compare.
* @param count The maximum number of characters to compare.
* @return a negative/zero/positive integer corresponding to whether
* the first string is less than/equal to/greater than the second one
* in code point order
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_memcmpCodePointOrder(const UChar *s1, const UChar *s2, int32_t count);
/**
* Search for a UChar within a Unicode string until <TT>count</TT>
* is reached.
*
* @param src string to search in
* @param ch character to find
* @param count maximum number of UChars in <TT>src</TT>to search for
* <TT>ch</TT>.
* @return A pointer within src, pointing to <TT>ch</TT>, or NULL if it
* was not found.
* @stable
*/
U_CAPI UChar* U_EXPORT2
u_memchr(const UChar *src, UChar ch, int32_t count);
/**
* Find the first occurence of a specified code point in a string.
*
* This function finds code points, which differs for BMP code points
* from u_memchr() only for surrogates:
* While u_memchr() finds any surrogate code units in a string,
* u_memchr32() finds only unmatched surrogate code points,
* i.e., only those that do not combine with an adjacent surrogate
* to form a supplementary code point.
* For example, in a string "\ud800\udc00" u_memchr()
* will find code units U+d800 at 0 and U+dc00 at 1,
* but u_memchr32() will find neither because they
* combine to the code point U+10000.
* Either function will find U+d800 in "a\ud800b".
* This behavior ensures that UTF_GET_CHAR(u_memchr32(c))==c.
*
* @param src string to search in
* @param ch character to find
* @param count maximum number of UChars in <TT>src</TT>to search for
* <TT>ch</TT>.
* @return A pointer within src, pointing to <TT>ch</TT>, or NULL if it
* was not found.
* @stable
*/
U_CAPI UChar* U_EXPORT2
u_memchr32(const UChar *src, UChar32 ch, int32_t count);
/**
* Unicode String literals in C.
* We need one macro to declare a variable for the string
* and to statically preinitialize it if possible,
* and a second macro to dynamically intialize such a string variable if necessary.
*
* The macros are defined for maximum performance.
* They work only for strings that contain "invariant characters", i.e.,
* only latin letters, digits, and some punctuation.
* See utypes.h for details.
*
* A pair of macros for a single string must be used with the same
* parameters.
* The string parameter must be a C string literal.
* The length of the string, not including the terminating
* <code>NUL</code>, must be specified as a constant.
* The U_STRING_DECL macro should be invoked exactly once for one
* such string variable before it is used.
*
* Usage:
* <pre>
* &#32; U_STRING_DECL(ustringVar1, "Quick-Fox 2", 11);
* &#32; U_STRING_DECL(ustringVar2, "jumps 5%", 8);
* &#32; static UBool didInit=FALSE;
* &#32;
* &#32; int32_t function() {
* &#32; if(!didInit) {
* &#32; U_STRING_INIT(ustringVar1, "Quick-Fox 2", 11);
* &#32; U_STRING_INIT(ustringVar2, "jumps 5%", 8);
* &#32; didInit=TRUE;
* &#32; }
* &#32; return u_strcmp(ustringVar1, ustringVar2);
* &#32; }
* </pre>
* @stable
*/
#if U_SIZEOF_WCHAR_T==U_SIZEOF_UCHAR && U_CHARSET_FAMILY==U_ASCII_FAMILY
# define U_STRING_DECL(var, cs, length) static const wchar_t var[(length)+1]={ L ## cs }
# define U_STRING_INIT(var, cs, length)
#elif U_SIZEOF_UCHAR==1 && U_CHARSET_FAMILY==U_ASCII_FAMILY
# define U_STRING_DECL(var, cs, length) static const UChar var[(length)+1]={ (const UChar *)cs }
# define U_STRING_INIT(var, cs, length)
#else
# define U_STRING_DECL(var, cs, length) static UChar var[(length)+1]
# define U_STRING_INIT(var, cs, length) u_charsToUChars(cs, var, length+1)
#endif
/**
* Unescape a string of characters and write the resulting
* Unicode characters to the destination buffer. The following escape
* sequences are recognized:
*
* \uhhhh 4 hex digits; h in [0-9A-Fa-f]
* \Uhhhhhhhh 8 hex digits
* \xhh 1-2 hex digits
* \ooo 1-3 octal digits; o in [0-7]
*
* as well as the standard ANSI C escapes:
*
* \a => U+0007, \b => U+0008, \t => U+0009, \n => U+000A,
* \v => U+000B, \f => U+000C, \r => U+000D,
* \" => U+0022, \' => U+0027, \? => U+003F, \\ => U+005C
*
* Anything else following a backslash is generically escaped. For
* example, "[a\-z]" returns "[a-z]".
*
* If an escape sequence is ill-formed, this method returns an empty
* string. An example of an ill-formed sequence is "\u" followed by
* fewer than 4 hex digits.
*
* The above characters are recognized in the compiler's codepage,
* that is, they are coded as 'u', '\\', etc. Characters that are
* not parts of escape sequences are converted using u_charsToUChars().
*
* This function is similar to UnicodeString::unescape() but not
* identical to it. The latter takes a source UnicodeString, so it
* does escape recognition but no conversion.
*
* @param src a zero-terminated string of invariant characters
* @param dest pointer to buffer to receive converted and unescaped
* text and, if there is room, a zero terminator. May be NULL for
* preflighting, in which case no UChars will be written, but the
* return value will still be valid. On error, an empty string is
* stored here (if possible).
* @param destCapacity the number of UChars that may be written at
* dest. Ignored if dest == NULL.
* @return the capacity required to fully convert all of the source
* text, including the zero terminator, or 0 on error.
* @see u_unescapeAt
* @see UnicodeString#unescape()
* @see UnicodeString#unescapeAt()
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_unescape(const char *src,
UChar *dest, int32_t destCapacity);
/**
* Callback function for u_unescapeAt() that returns a character of
* the source text given an offset and a context pointer. The context
* pointer will be whatever is passed into u_unescapeAt().
*
* @param offset pointer to the offset that will be passed to u_unescapeAt().
* @context an opaque pointer passed directly into u_unescapeAt()
* @return the character represented by the escape sequence at
* offset
* @see u_unescapeAt
* @stable
*/
U_CDECL_BEGIN
typedef UChar (U_CALLCONV *UNESCAPE_CHAR_AT)(int32_t offset, void *context);
U_CDECL_END
/**
* Unescape a single sequence. The character at offset-1 is assumed
* (without checking) to be a backslash. This method takes a callback
* pointer to a function that returns the UChar at a given offset. By
* varying this callback, ICU functions are able to unescape char*
* strings, UnicodeString objects, and UFILE pointers.
*
* If offset is out of range, or if the escape sequence is ill-formed,
* (UChar32)0xFFFFFFFF is returned. See documentation of u_unescape()
* for a list of recognized sequences.
*
* @param charAt callback function that returns a UChar of the source
* text given an offset and a context pointer.
* @param offset pointer to the offset that will be passed to charAt.
* The offset value will be updated upon return to point after the
* last parsed character of the escape sequence. On error the offset
* is unchanged.
* @param length the number of characters in the source text. The
* last character of the source text is considered to be at offset
* length-1.
* @param context an opaque pointer passed directly into charAt.
* @return the character represented by the escape sequence at
* offset, or (UChar32)0xFFFFFFFF on error.
* @see u_unescape()
* @see UnicodeString#unescape()
* @see UnicodeString#unescapeAt()
* @stable
*/
U_CAPI UChar32 U_EXPORT2
u_unescapeAt(UNESCAPE_CHAR_AT charAt,
int32_t *offset,
int32_t length,
void *context);
/**
* Uppercase the characters in a 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 are allowed to overlap.
*
* @param dest A buffer for the result string. The result will be zero-terminated if
* the buffer is large enough.
* @param 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.
* @param src The original string
* @param srcLength The length of the original string. If -1, then src must be zero-terminated.
* @param locale The locale to consider, or "" for the root locale or NULL for the default locale.
* @param pErrorCode Must be a valid pointer to an error code value,
* which must not indicate a failure before the function call.
* @return The length of the result string. It may be greater than destCapacity. In that case,
* only some of the result was written to the destination buffer.
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strToUpper(UChar *dest, int32_t destCapacity,
const UChar *src, int32_t srcLength,
const char *locale,
UErrorCode *pErrorCode);
/**
* Lowercase the characters in a 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 are allowed to overlap.
*
* @param dest A buffer for the result string. The result will be zero-terminated if
* the buffer is large enough.
* @param 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.
* @param src The original string
* @param srcLength The length of the original string. If -1, then src must be zero-terminated.
* @param locale The locale to consider, or "" for the root locale or NULL for the default locale.
* @param pErrorCode Must be a valid pointer to an error code value,
* which must not indicate a failure before the function call.
* @return The length of the result string. It may be greater than destCapacity. In that case,
* only some of the result was written to the destination buffer.
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strToLower(UChar *dest, int32_t destCapacity,
const UChar *src, int32_t srcLength,
const char *locale,
UErrorCode *pErrorCode);
#if !UCONFIG_NO_BREAK_ITERATION
/**
* Titlecase a 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.
*
* The titlecase break iterator can be provided to customize for arbitrary
* styles, using rules and dictionaries beyond the standard iterators.
* It may be more efficient to always provide an iterator to avoid
* opening and closing one for each string.
* The standard titlecase iterator for the root locale implements the
* algorithm of Unicode TR 21.
*
* This function uses only the 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 are allowed to overlap.
*
* @param dest A buffer for the result string. The result will be zero-terminated if
* the buffer is large enough.
* @param 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.
* @param src The original string
* @param srcLength The length of the original string. If -1, then src must be zero-terminated.
* @param titleIter A break iterator to find the first characters of words
* that are to be titlecased.
* If none is provided (NULL), then a standard titlecase
* break iterator is opened.
* @param locale The locale to consider, or "" for the root locale or NULL for the default locale.
* @param pErrorCode Must be a valid pointer to an error code value,
* which must not indicate a failure before the function call.
* @return The length of the result string. It may be greater than destCapacity. In that case,
* only some of the result was written to the destination buffer.
* @draft ICU 2.1
*/
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);
#endif
/**
* Case-fold the characters in a 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 'I' in CaseFolding.txt.
* The result may be longer or shorter than the original.
* The source string and the destination buffer are allowed to overlap.
*
* @param dest A buffer for the result string. The result will be zero-terminated if
* the buffer is large enough.
* @param 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.
* @param src The original string
* @param srcLength The length of the original string. If -1, then src must be zero-terminated.
* @param options Either U_FOLD_CASE_DEFAULT or U_FOLD_CASE_EXCLUDE_SPECIAL_I
* @param pErrorCode Must be a valid pointer to an error code value,
* which must not indicate a failure before the function call.
* @return The length of the result string. It may be greater than destCapacity. In that case,
* only some of the result was written to the destination buffer.
* @stable
*/
U_CAPI int32_t U_EXPORT2
u_strFoldCase(UChar *dest, int32_t destCapacity,
const UChar *src, int32_t srcLength,
uint32_t options,
UErrorCode *pErrorCode);
/**
* Converts a sequence of UChars to wchar_t units.
*
* @param dest A buffer for the result string. The result will be zero-terminated if
* the buffer is large enough.
* @param destCapacity The size of the buffer (number of wchar_t's). 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 (pre-flighting).
* @param pDestLength A pointer to receive the number of units written to the destination. If
* pDestLength!=NULL then *pDestLength is always set to the
* number of output units corresponding to the transformation of
* all the input units, even in case of a buffer overflow.
* @param src The original source string
* @param srcLength The length of the original string. If -1, then src must be zero-terminated.
* @param pErrorCode Must be a valid pointer to an error code value,
* which must not indicate a failure before the function call.
* @return The pointer to destination buffer.
* @draft ICU 2.0
*/
U_CAPI wchar_t* U_EXPORT2
u_strToWCS(wchar_t *dest,
int32_t destCapacity,
int32_t *pDestLength,
const UChar *src,
int32_t srcLength,
UErrorCode *pErrorCode);
/**
* Converts a sequence of wchar_t units to UChars
*
* @param dest A buffer for the result string. The result will be zero-terminated if
* the buffer is large enough.
* @param 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 (pre-flighting).
* @param pDestLength A pointer to receive the number of units written to the destination. If
* pDestLength!=NULL then *pDestLength is always set to the
* number of output units corresponding to the transformation of
* all the input units, even in case of a buffer overflow.
* @param src The original source string
* @param srcLength The length of the original string. If -1, then src must be zero-terminated.
* @param pErrorCode Must be a valid pointer to an error code value,
* which must not indicate a failure before the function call.
* @return The pointer to destination buffer.
* @draft ICU 2.0
*/
U_CAPI UChar* U_EXPORT2
u_strFromWCS(UChar *dest,
int32_t destCapacity,
int32_t *pDestLength,
const wchar_t *src,
int32_t srcLength,
UErrorCode *pErrorCode);
/**
* Converts a sequence of UChars (UTF-16) to UTF-8 bytes
*
* @param dest A buffer for the result string. The result will be zero-terminated if
* the buffer is large enough.
* @param destCapacity The size of the buffer (number of chars). 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 (pre-flighting).
* @param pDestLength A pointer to receive the number of units written to the destination. If
* pDestLength!=NULL then *pDestLength is always set to the
* number of output units corresponding to the transformation of
* all the input units, even in case of a buffer overflow.
* @param src The original source string
* @param srcLength The length of the original string. If -1, then src must be zero-terminated.
* @param pErrorCode Must be a valid pointer to an error code value,
* which must not indicate a failure before the function call.
* @return The pointer to destination buffer.
* @draft ICU 2.0
*/
U_CAPI char* U_EXPORT2
u_strToUTF8(char *dest,
int32_t destCapacity,
int32_t *pDestLength,
const UChar *src,
int32_t srcLength,
UErrorCode *pErrorCode);
/**
* Converts a sequence of UTF-8 bytes to UChars (UTF-16).
*
* @param dest A buffer for the result string. The result will be zero-terminated if
* the buffer is large enough.
* @param 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 (pre-flighting).
* @param pDestLength A pointer to receive the number of units written to the destination. If
* pDestLength!=NULL then *pDestLength is always set to the
* number of output units corresponding to the transformation of
* all the input units, even in case of a buffer overflow.
* @param src The original source string
* @param srcLength The length of the original string. If -1, then src must be zero-terminated.
* @param pErrorCode Must be a valid pointer to an error code value,
* which must not indicate a failure before the function call.
* @return The pointer to destination buffer.
* @draft ICU 2.0
*/
U_CAPI UChar* U_EXPORT2
u_strFromUTF8(UChar *dest,
int32_t destCapacity,
int32_t *pDestLength,
const char *src,
int32_t srcLength,
UErrorCode *pErrorCode);
/**
* Converts a sequence of UTF32 units to UChars
*
* @param dest A buffer for the result string. The result will be zero-terminated if
* the buffer is large enough.
* @param destCapacity The size of the buffer (number of UChar32s). 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 (pre-flighting).
* @param pDestLength A pointer to receive the number of units written to the destination. If
* pDestLength!=NULL then *pDestLength is always set to the
* number of output units corresponding to the transformation of
* all the input units, even in case of a buffer overflow.
* @param src The original source string
* @param srcLength The length of the original string. If -1, then src must be zero-terminated.
* @param pErrorCode Must be a valid pointer to an error code value,
* which must not indicate a failure before the function call.
* @return The pointer to destination buffer.
* @draft ICU 2.0
*/
U_CAPI UChar32* U_EXPORT2
u_strToUTF32(UChar32 *dest,
int32_t destCapacity,
int32_t *pDestLength,
const UChar *src,
int32_t srcLength,
UErrorCode *pErrorCode);
/**
* Converts a sequence of UChars to UTF32 units.
*
* @param dest A buffer for the result string. The result will be zero-terminated if
* the buffer is large enough.
* @param 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 (pre-flighting).
* @param pDestLength A pointer to receive the number of units written to the destination. If
* pDestLength!=NULL then *pDestLength is always set to the
* number of output units corresponding to the transformation of
* all the input units, even in case of a buffer overflow.
* @param src The original source string
* @param srcLength The length of the original string. If -1, then src must be zero-terminated.
* @param pErrorCode Must be a valid pointer to an error code value,
* which must not indicate a failure before the function call.
* @return The pointer to destination buffer.
* @draft ICU 2.0
*/
U_CAPI UChar* U_EXPORT2
u_strFromUTF32(UChar *dest,
int32_t destCapacity,
int32_t *pDestLength,
const UChar32 *src,
int32_t srcLength,
UErrorCode *pErrorCode);
#endif
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