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Tcl_UtfToTitle

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NAME

Tcl_UniCharToUpper, Tcl_UniCharToLower, Tcl_UniCharToTitle, Tcl_UtfToUpper, Tcl_UtfToLower, Tcl_UtfToTitle - routines for manipulating 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.

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DESCRIPTION

The first three routines convert the case of individual Unicode characters:

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 different 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 original string length.

Tcl_UtfToLower is the same as Tcl_UtfToUpper except it turns each character 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 following 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