NAME
set_ucodepage - Sets 8-bit to Unicode conversion tables. Allegro game
programming library.
SYNOPSIS
#include <allegro.h>
void set_ucodepage(const unsigned short *table, const unsigned short
*extras);
DESCRIPTION
When you select the U_ASCII_CP encoding mode, a set of tables are used
to convert between 8-bit characters and their Unicode equivalents. You
can use this function to specify a custom set of mapping tables, which
allows you to support different 8-bit codepages.
The `table' parameter points to an array of 256 shorts, which contain
the Unicode value for each character in your codepage. The `extras'
parameter, if not NULL, points to a list of mapping pairs, which will
be used when reducing Unicode data to your codepage. Each pair consists
of a Unicode value, followed by the way it should be represented in
your codepage. The list is terminated by a zero Unicode value. This
allows you to create a many->one mapping, where many different Unicode
characters can be represented by a single codepage value (eg. for
reducing accented vowels to 7-bit ASCII).
Allegro will use the `table' parameter when it needs to convert an
ASCII string to an Unicode string. But when Allegro converts an Unicode
string to ASCII, it will use both parameters. First, it will loop
through the `table' parameter looking for an index position pointing at
the Unicode value it is trying to convert (ie. the `table' parameter is
also used for reverse matching). If that fails, the `extras' list is
used. If that fails too, Allegro will put the character `^', giving up
the conversion.
Note that Allegro comes with a default `table' and `extras' parameters
set internally. The default `table' will convert 8-bit characters to
`^'. The default `extras' list reduces Latin-1 and Extended-A
characters to 7 bits in a sensible way (eg. an accented vowel will be
reduced to the same vowel without the accent).
SEE ALSO
set_uformat(3alleg)