Tcl_UniCharToUpper, Tcl_UniCharToLower, Tcl_UniCharToTi
tle, Tcl_UtfToUpper, Tcl_UtfToLower, Tcl_UtfToTitle - rou
tines for manipulating the case of Unicode characters and
int ch (in) The Tcl_UniChar to be converted.
char *str (in/out) Pointer to UTF-8 string to be con
verted in place.
The first three routines convert the case of individual
If ch represents a lower-case character, Tcl_UniCharToUp
per returns the corresponding upper-case character. If no
upper-case character is defined, it returns the character
If ch represents an upper-case character, Tcl_UniChar
ToLower returns the corresponding lower-case character.
If no lower-case character is defined, it returns the
If ch represents a lower-case character, Tcl_UniCharToTi
tle returns the corresponding title-case character. If no
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 con
verted 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
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
At this time, the case conversions are only defined for
the ISO8859-1 characters. Unicode characters above 0x00ff
are not modified by these routines.
utf, unicode, toupper, tolower, totitle, case