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Tcl_UtfToUpper(3)	    Tcl Library Procedures	     Tcl_UtfToUpper(3)

______________________________________________________________________________

NAME
       Tcl_UniCharToUpper,	 Tcl_UniCharToLower,	   Tcl_UniCharToTitle,
       Tcl_UtfToUpper, Tcl_UtfToLower, Tcl_UtfToTitle - routines  for  manipu‐
       lating the case of Unicode characters and UTF-8 strings.

SYNOPSIS
       #include <tcl.h>

       Tcl_UniChar
       Tcl_UniCharToUpper(ch)

       Tcl_UniChar
       Tcl_UniCharToLower(ch)

       Tcl_UniChar
       Tcl_UniCharToTitle(ch)

       int
       Tcl_UtfToUpper(str)

       int
       Tcl_UtfToLower(str)

       int
       Tcl_UtfToTitle(str)

ARGUMENTS
       int    ch     (in)      The Tcl_UniChar to be converted.

       char   *str   (in/out)  Pointer	to  UTF-8  string  to  be converted in
			       place.
_________________________________________________________________

DESCRIPTION
       The first three routines convert the case of individual Unicode charac‐
       ters:

       If ch represents a lower-case character, Tcl_UniCharToUpper returns the
       corresponding upper-case character.   If	 no  upper-case	 character  is
       defined, it returns the character unchanged.

       If  ch  represents  an upper-case character, Tcl_UniCharToLower returns
       the corresponding lower-case character.	If no lower-case character  is
       defined, it returns the character unchanged.

       If ch represents a lower-case character, Tcl_UniCharToTitle returns the
       corresponding title-case character.   If	 no  title-case	 character  is
       defined,	 it  returns  the  corresponding  upper-case character.	 If no
       upper-case character is defined, it returns  the	 character  unchanged.
       Title-case is defined for a small number of characters that have a dif‐
       ferent appearance when they are at the beginning of a capitalized word.

       The next three routines convert the case of UTF-8 strings in  place  in
       memory:

       Tcl_UtfToUpper  changes	every  UTF-8  character	 in str to upper-case.
       Because changing the case of a character may change its size, the  byte
       offset  of  each	 character in the resulting string may differ from its
       original location.  Tcl_UtfToUpper writes a null byte at the end of the
       converted  string.  Tcl_UtfToUpper returns the new length of the string
       in bytes.  This new length is guaranteed to be no longer than the orig‐
       inal string length.

       Tcl_UtfToLower is the same as Tcl_UtfToUpper except it turns each char‐
       acter in the string into its lower-case equivalent.

       Tcl_UtfToTitle is the same as Tcl_UtfToUpper except it turns the	 first
       character  in the string into its title-case equivalent and all follow‐
       ing characters into their lower-case equivalents.

BUGS
       At this time, the case conversions are only defined for	the  ISO8859-1
       characters.   Unicode characters above 0x00ff are not modified by these
       routines.

KEYWORDS
       utf, unicode, toupper, tolower, totitle, case

Tcl				      8.1		     Tcl_UtfToUpper(3)
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