Tcl_UtfToUpper(3)

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>

int
Tcl_UniCharToUpper(ch)

int
Tcl_UniCharToLower(ch)

int
Tcl_UniCharToTitle(ch)

Tcl_Size
Tcl_UtfToUpper(str)

Tcl_Size
Tcl_UtfToLower(str)

Tcl_Size
Tcl_UtfToTitle(str)

ARGUMENTS
The Unicode character to be converted. Pointer to the TUTF-8 byte sequence to be converted in place.

DESCRIPTION

N.B. Refer to the Tcl_UniChar documentation page for a description of the TUTF-8 encoding and related terms referenced here.

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 null-terminated TUTF-8 byte sequences in place in memory:

Tcl_UtfToUpper changes every TUTF-8 encoded 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.

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