/*
**********************************************************************
*   Copyright (C) 1998-1999, 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"

/** 
 * 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);

/**
 * 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);

/**
 * Compare two ustrings for bitwise equality.
 *
 * @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 ustrings for bitwise equality. 
 * Compares at most <TT>n</TT> characters.
 * @param s1 A string to compare.
 * @param s2 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);

/**
 * 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 *ucs1,
               const char *s2 );

/**
 * 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 *ucs1,
            const char *s2,
            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 *s1,
            const UChar *us2 );

/**
 * 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>
 */
#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

#endif