fribidi_remove_bidi_marks (3) - Linux Manuals

fribidi_remove_bidi_marks: remove bidi marks out of an string


fribidi_remove_bidi_marks - remove bidi marks out of an string


#include <fribidi.h>

extern FriBidiStrIndex fribidi_remove_bidi_marks
       FriBidiChar *str,

       const FriBidiStrIndex len,

       FriBidiStrIndex *positions_to_this,

       FriBidiStrIndex *position_from_this_list,

       FriBidiLevel *embedding_levels



FriBidiChar *str
Input string to clean.
const FriBidiStrIndex len
Input string length.
FriBidiStrIndex *positions_to_this
List mapping positions to the order used in str.
FriBidiStrIndex *position_from_this_list
List mapping positions from the order used in str.
FriBidiLevel *embedding_levels
List of embedding levels.


This function removes the bidi and boundary-neutral marks out of an string and the accompanying lists. It implements rule X9 of the Unicode Bidirectional Algorithm available at, with the exception that it removes U+200E LEFT-TO-RIGHT MARK and U+200F RIGHT-TO-LEFT MARK too.

If any of the input lists are NULL, the list is skipped. If str is the visual string, then positions_to_this is positions_L_to_V and position_from_this_list is positions_V_to_L; if str is the logical string, the other way. Moreover, the position maps should be filled with valid entries.

A position map pointing to a removed character is filled with -1. By the way, you should not use embedding_levels if str is visual string.

For best results this function should be run on a whole paragraph, not lines; but feel free to do otherwise if you know what you are doing.


New length of the string, or -1 if an error occurred (memory allocation failure most probably).