547 lines
20 KiB
C
547 lines
20 KiB
C
/*
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**********************************************************************
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* Copyright (C) 1998-1999, 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 ustring.h
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*
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* Modification History:
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*
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* Date Name Description
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* 12/07/98 bertrand Creation.
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*******************************************************************************
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*/
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#ifndef USTRING_H
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#define USTRING_H
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#include "unicode/utypes.h"
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/**
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* Determine the length of an array of UChar.
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*
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* @param s The array of UChars, NULL (U+0000) terminated.
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* @return The number of UChars in <TT>chars</TT>, minus the terminator.
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* @stable
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*/
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U_CAPI int32_t U_EXPORT2
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u_strlen(const UChar *s);
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/**
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* Concatenate two ustrings. Appends a copy of <TT>src</TT>,
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* including the null terminator, to <TT>dst</TT>. The initial copied
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* character from <TT>src</TT> overwrites the null terminator in <TT>dst</TT>.
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* @param dst The destination string.
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* @param src The source string.
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* @return A pointer to <TT>dst</TT>.
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* @stable
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*/
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U_CAPI UChar* U_EXPORT2
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u_strcat(UChar *dst,
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const UChar *src);
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/**
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* Concatenate two ustrings.
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* Appends at most <TT>n</TT> characters from <TT>src</TT> to <TT>dst</TT>.
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* Adds a null terminator.
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* @param dst The destination string.
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* @param src The source string.
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* @param n The maximum number of characters to compare.
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* @return A pointer to <TT>dst</TT>.
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* @stable
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*/
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U_CAPI UChar* U_EXPORT2
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u_strncat(UChar *dst,
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const UChar *src,
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int32_t n);
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/**
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* Find the first occurrence of a specified character in a ustring.
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*
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* @param s The string to search.
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* @param c The character to find.
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* @return A pointer to the first occurrence of <TT>c</TT> in <TT>s</TT>,
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* or a null pointer if <TT>s</TT> does not contain <TT>c</TT>.
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* @stable
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*/
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U_CAPI UChar* U_EXPORT2
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u_strchr(const UChar *s,
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UChar c);
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/**
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* Find the first occurrence of a substring in a string.
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*
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* @param s The string to search.
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* @return A pointer to the first occurrence of <TT>substring</TT> in
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* <TT>s</TT>, or a null pointer if <TT>substring</TT>
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* is not in <TT>s</TT>.
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*/
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U_CAPI UChar * U_EXPORT2
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u_strstr(const UChar *s, const UChar *substring);
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/**
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* Find the first occurence of a specified code point in a string.
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*
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* @param s The string to search.
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* @param c The code point (0..0x10ffff) to find.
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* @return A pointer to the first occurrence of <TT>c</TT> in <TT>s</TT>,
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* or a null pointer if there is no such character.
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* If <TT>c</TT> is represented with several UChars, then the returned
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* pointer will point to the first of them.
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* @draft
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*/
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U_CAPI UChar * U_EXPORT2
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u_strchr32(const UChar *s, UChar32 c);
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/**
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* Locates the first occurrence in the string str of any of the characters
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* in the string accept.
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* Works just like C's strpbrk but with Unicode.
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* @return A pointer to the character in str that matches one of the
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* characters in accept, or NULL if no such character is found.
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* @draft
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*/
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U_CAPI UChar * U_EXPORT2
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u_strpbrk(const UChar *string, const UChar *matchSet);
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/**
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* Returns the number of consecutive characters in string1,
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* beginning with the first, that do not occur somewhere in string2.
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* Works just like C's strcspn but with Unicode.
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* @see u_strspn
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* @draft
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*/
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U_CAPI int32_t U_EXPORT2
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u_strcspn(const UChar *string, const UChar *matchSet);
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/**
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* Returns the number of consecutive characters in string1,
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* beginning with the first, that occur somewhere in string2.
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* Works just like C's strspn but with Unicode.
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* @see u_strcspn
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* @draft
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*/
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U_CAPI int32_t U_EXPORT2
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u_strspn(const UChar *string, const UChar *matchSet);
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/**
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* The string tokenizer API allows an application to break a string into
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* tokens. Unlike strtok(), the saveState (the current pointer within the
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* original string) is maintained in saveState. In the first call, the
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* argument src is a pointer to the string. In subsequent calls to
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* return successive tokens of that string, src must be specified as
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* NULL. The value saveState is set by this function to maintain the
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* function's position within the string, and on each subsequent call
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* you must return the same value. This function does handle surrogate
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* pairs. This function is similar to the strtok_r() the POSIX Threads
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* Extension (1003.1c-1995) version.
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*
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* @param src String containing token(s). This will be modified.
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* @param delim Set of delimiter characters (Unicode code points).
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* @param saveState The current pointer within the original string,
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* which is set by this function.
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* @return A pointer to the next token found in src, or NULL
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* when there are no more tokens.
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* @draft
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*/
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U_CAPI UChar * U_EXPORT2
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u_strtok_r(UChar *src,
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const UChar *delim,
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UChar **saveState);
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/**
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* Compare two Unicode strings for bitwise equality (code unit order).
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*
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* @param s1 A string to compare.
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* @param s2 A string to compare.
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* @return 0 if <TT>s1</TT> and <TT>s2</TT> are bitwise equal; a negative
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* value if <TT>s1</TT> is bitwise less than <TT>s2,/TT>; a positive
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* value if <TT>s1</TT> is bitwise greater than <TT>s2,/TT>.
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* @stable
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*/
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U_CAPI int32_t U_EXPORT2
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u_strcmp(const UChar *s1,
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const UChar *s2);
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/**
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* Compare two Unicode strings in code point order.
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* This is different in UTF-16 from u_strcmp() if supplementary characters are present:
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* In UTF-16, supplementary characters (with code points U+10000 and above) are
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* stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
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* which means that they compare as less than some other BMP characters like U+feff.
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* This function compares Unicode strings in code point order.
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* If eihter of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
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*
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* @param s1 A string to compare.
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* @param s2 A string to compare.
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* @return a negative/zero/positive integer corresponding to whether
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* the first string is less than/equal to/greater than the second one
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* in code point order
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* @draft
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*/
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U_CAPI int32_t U_EXPORT2
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u_strcmpCodePointOrder(const UChar *s1, const UChar *s2);
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/**
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* Compare two ustrings for bitwise equality.
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* Compares at most <TT>n</TT> characters.
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* @param s1 A string to compare.
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* @param s2 A string to compare.
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* @param n The maximum number of characters to compare.
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* @return 0 if <TT>s1</TT> and <TT>s2</TT> are bitwise equal; a negative
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* value if <TT>s1</TT> is bitwise less than <TT>s2,/TT>; a positive
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* value if <TT>s1</TT> is bitwise greater than <TT>s2,/TT>.
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* @stable
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*/
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U_CAPI int32_t U_EXPORT2
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u_strncmp(const UChar *ucs1,
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const UChar *ucs2,
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int32_t n);
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/**
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* Compare two strings case-insensitively using full case folding.
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* This is equivalent to u_strcmp(u_strFoldCase(s1, options), u_strFoldCase(s2, options)).
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*
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* @param s1 A string to compare.
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* @param s2 A string to compare.
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* @param options Either U_FOLD_CASE_DEFAULT or U_FOLD_CASE_EXCLUDE_SPECIAL_I
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* @return A negative, zero, or positive integer indicating the comparison result.
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* @draft
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*/
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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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/**
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* Compare two strings case-insensitively using full case folding.
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* This is equivalent to u_strcmp(u_strFoldCase(s1, at most n, options), u_strFoldCase(s2, at most n, options)).
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*
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* @param s1 A string to compare.
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* @param s2 A string to compare.
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* @param n The maximum number of characters each string to case-fold and then compare.
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* @param options Either U_FOLD_CASE_DEFAULT or U_FOLD_CASE_EXCLUDE_SPECIAL_I
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* @return A negative, zero, or positive integer indicating the comparison result.
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* @draft
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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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* Compare two strings case-insensitively using full case folding.
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* This is equivalent to u_strcmp(u_strFoldCase(s1, n, options), u_strFoldCase(s2, n, options)).
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*
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* @param s1 A string to compare.
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* @param s2 A string to compare.
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* @param n The number of characters in each string to case-fold and then compare.
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* @param options Either U_FOLD_CASE_DEFAULT or U_FOLD_CASE_EXCLUDE_SPECIAL_I
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* @return A negative, zero, or positive integer indicating the comparison result.
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* @draft
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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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/**
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* Copy a ustring.
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* Adds a null terminator.
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* @param dst The destination string.
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* @param src The source string.
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* @return A pointer to <TT>dst</TT>.
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* @stable
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*/
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U_CAPI UChar* U_EXPORT2
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u_strcpy(UChar *dst,
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const UChar *src);
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/**
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* Copy a ustring.
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* Copies at most <TT>n</TT> characters. The result will be null terminated
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* if the length of <TT>src</TT> is less than <TT>n</TT>.
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* @param dst The destination string.
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* @param src The source string.
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* @param n The maximum number of characters to copy.
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* @return A pointer to <TT>dst</TT>.
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* @stable
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*/
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U_CAPI UChar* U_EXPORT2
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u_strncpy(UChar *dst,
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const UChar *src,
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int32_t n);
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/**
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* Copy a byte string encoded in the default codepage to a ustring.
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* Adds a null terminator.
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* Performs a host byte to UChar conversion
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*
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* @param dst The destination string.
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* @param src The source string.
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* @return A pointer to <TT>dst</TT>.
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* @stable
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*/
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U_CAPI UChar* U_EXPORT2 u_uastrcpy(UChar *dst,
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const char *src );
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/**
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* Copy a byte string encoded in the default codepage to a ustring.
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* Copies at most <TT>n</TT> characters. The result will be null terminated
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* if the length of <TT>src</TT> is less than <TT>n</TT>.
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* Performs a host byte to UChar conversion
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*
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* @param dst The destination string.
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* @param src The source string.
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* @param n The maximum number of characters to copy.
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* @return A pointer to <TT>dst</TT>.
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* @stable
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*/
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U_CAPI UChar* U_EXPORT2 u_uastrncpy(UChar *dst,
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const char *src,
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int32_t n);
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/**
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* Copy ustring to a byte string encoded in the default codepage.
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* Adds a null terminator.
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* Performs a UChar to host byte conversion
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*
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* @param dst The destination string.
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* @param src The source string.
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* @return A pointer to <TT>dst</TT>.
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* @stable
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*/
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U_CAPI char* U_EXPORT2 u_austrcpy(char *dst,
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const UChar *src );
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/**
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* Copy ustring to a byte string encoded in the default codepage.
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* Copies at most <TT>n</TT> characters. The result will be null terminated
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* if the length of <TT>src</TT> is less than <TT>n</TT>.
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* Performs a UChar to host byte conversion
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*
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* @param dst The destination string.
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* @param src The source string.
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* @param n The maximum number of characters to copy.
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* @return A pointer to <TT>dst</TT>.
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* @stable
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*/
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U_CAPI char* U_EXPORT2 u_austrncpy(char *dst,
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const UChar *src,
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int32_t n );
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/**
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* Unicode String literals in C.
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* We need one macro to declare a variable for the string
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* and to statically preinitialize it if possible,
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* and a second macro to dynamically intialize such a string variable if necessary.
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*
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* The macros are defined for maximum performance.
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* They work only for strings that contain "invariant characters", i.e.,
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* only latin letters, digits, and some punctuation.
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* See utypes.h for details.
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*
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* A pair of macros for a single string must be used with the same
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* parameters.
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* The string parameter must be a C string literal.
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* The length of the string, not including the terminating
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* <code>NUL</code>, must be specified as a constant.
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* The U_STRING_DECL macro should be invoked exactly once for one
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* such string variable before it is used.
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*
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* Usage:
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* <pre>
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*   U_STRING_DECL(ustringVar1, "Quick-Fox 2", 11);
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*   U_STRING_DECL(ustringVar2, "jumps 5%", 8);
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*   static UBool didInit=FALSE;
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*  
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*   int32_t function() {
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*   if(!didInit) {
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*   U_STRING_INIT(ustringVar1, "Quick-Fox 2", 11);
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*   U_STRING_INIT(ustringVar2, "jumps 5%", 8);
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*   didInit=TRUE;
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*   }
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*   return u_strcmp(ustringVar1, ustringVar2);
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*   }
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* </pre>
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*/
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#if U_SIZEOF_WCHAR_T==U_SIZEOF_UCHAR && U_CHARSET_FAMILY==U_ASCII_FAMILY
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# define U_STRING_DECL(var, cs, length) static const wchar_t var[(length)+1]={ L ## cs }
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# define U_STRING_INIT(var, cs, length)
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#elif U_SIZEOF_UCHAR==1 && U_CHARSET_FAMILY==U_ASCII_FAMILY
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# define U_STRING_DECL(var, cs, length) static const UChar var[(length)+1]={ (const UChar *)cs }
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# define U_STRING_INIT(var, cs, length)
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#else
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# define U_STRING_DECL(var, cs, length) static UChar var[(length)+1]
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# define U_STRING_INIT(var, cs, length) u_charsToUChars(cs, var, length+1)
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#endif
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/**
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* Unescape a string of characters and write the resulting
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* Unicode characters to the destination buffer. The following escape
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* sequences are recognized:
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*
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* \uhhhh 4 hex digits; h in [0-9A-Fa-f]
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* \Uhhhhhhhh 8 hex digits
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* \xhh 1-2 hex digits
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* \ooo 1-3 octal digits; o in [0-7]
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*
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* as well as the standard ANSI C escapes:
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*
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* \a => U+0007, \b => U+0008, \t => U+0009, \n => U+000A,
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* \v => U+000B, \f => U+000C, \r => U+000D,
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* \" => U+0022, \' => U+0027, \? => U+003F, \\ => U+005C
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*
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* Anything else following a backslash is generically escaped. For
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* example, "[a\-z]" returns "[a-z]".
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*
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* If an escape sequence is ill-formed, this method returns an empty
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* string. An example of an ill-formed sequence is "\u" followed by
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* fewer than 4 hex digits.
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*
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* The above characters are recognized in the compiler's codepage,
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* that is, they are coded as 'u', '\\', etc. Characters that are
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* not parts of escape sequences are converted using u_charsToUChars().
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*
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* This function is similar to UnicodeString::unescape() but not
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* identical to it. The latter takes a source UnicodeString, so it
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* does escape recognition but no conversion.
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*
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* @param src a zero-terminated string of invariant characters
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* @param dest pointer to buffer to receive converted and unescaped
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* text and, if there is room, a zero terminator. May be NULL for
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* preflighting, in which case no UChars will be written, but the
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* return value will still be valid. On error, an empty string is
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* stored here (if possible).
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* @param destCapacity the number of UChars that may be written at
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* dest. Ignored if dest == NULL.
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* @return the capacity required to fully convert all of the source
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* text, including the zero terminator, or 0 on error.
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* @see u_unescapeAt
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* @see UnicodeString#unescape()
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* @see UnicodeString#unescapeAt()
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*/
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U_CAPI int32_t U_EXPORT2
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u_unescape(const char *src,
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UChar *dest, int32_t destCapacity);
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/**
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* Callback function for u_unescapeAt() that returns a character of
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* the source text given an offset and a context pointer. The context
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* pointer will be whatever is passed into u_unescapeAt().
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* @see u_unescapeAt
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*/
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U_CDECL_BEGIN
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typedef UChar (*UNESCAPE_CHAR_AT)(int32_t offset, void *context);
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U_CDECL_END
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/**
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* Unescape a single sequence. The character at offset-1 is assumed
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* (without checking) to be a backslash. This method takes a callback
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* pointer to a function that returns the UChar at a given offset. By
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* varying this callback, ICU functions are able to unescape char*
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* strings, UnicodeString objects, and UFILE pointers.
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*
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* If offset is out of range, or if the escape sequence is ill-formed,
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* (UChar32)0xFFFFFFFF is returned. See documentation of u_unescape()
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* for a list of recognized sequences.
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*
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* @param charAt callback function that returns a UChar of the source
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* text given an offset and a context pointer.
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* @param offset pointer to the offset that will be passed to charAt.
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* The offset value will be updated upon return to point after the
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* last parsed character of the escape sequence. On error the offset
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* is unchanged.
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* @param length the number of characters in the source text. The
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* last character of the source text is considered to be at offset
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* length-1.
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* @param context an opaque pointer passed directly into charAt.
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* @return the character represented by the escape sequence at
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* offset, or (UChar32)0xFFFFFFFF on error.
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* @see u_unescape()
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* @see UnicodeString#unescape()
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* @see UnicodeString#unescapeAt()
|
|
*/
|
|
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.
|
|
* @draft
|
|
*/
|
|
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.
|
|
* @draft
|
|
*/
|
|
U_CAPI int32_t U_EXPORT2
|
|
u_strToLower(UChar *dest, int32_t destCapacity,
|
|
const UChar *src, int32_t srcLength,
|
|
const char *locale,
|
|
UErrorCode *pErrorCode);
|
|
|
|
/**
|
|
* 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.
|
|
* @draft
|
|
*/
|
|
U_CAPI int32_t U_EXPORT2
|
|
u_strFoldCase(UChar *dest, int32_t destCapacity,
|
|
const UChar *src, int32_t srcLength,
|
|
uint32_t options,
|
|
UErrorCode *pErrorCode);
|
|
|
|
#endif
|