Manual

UTF-8 string routines

About UTF-8 string routines
UTF-8 string types
- ALLEGRO_USTR
- ALLEGRO_USTR_INFO
Creating and destroying strings
Predefined strings
- al_ustr_empty_string
Creating strings by referencing other data
Sizes and offsets
Getting code points
Inserting into strings
Appending to strings
Removing parts of strings
Assigning one string to another
Replacing parts of string
- al_ustr_set_chr
- al_ustr_replace_range
Searching
Comparing
UTF-16 conversion
Low-level UTF-8 routines
- al_utf8_width
- al_utf8_encode
Low-level UTF-16 routines
- al_utf16_width
- al_utf16_encode

al_utf8_width

size_t al_utf8_width(int c) Introduced in 5.0.0

Returns the number of bytes that would be occupied by the specified code point when encoded in UTF-8. This is between 1 and 4 bytes for legal code point values. Otherwise returns 0.

See also: al_utf8_encode, al_utf16_width

Examples: ex_utf8

Most helpful discussions:

Possible bug in allegro utf8 function
Official algui thread.