freetype reverse map

test.c

#define _XOPEN_SOURCE 500
#include <ftw.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

#include <ft2build.h>
#include FT_FREETYPE_H

//gcc test.c -o crap -I/usr/include/freetype2/ -l freetype

static int
display_info(const char *fpath, const struct stat *sb,
             int tflag, struct FTW *ftwbuf)
{

    FT_Library  library;

    int error = FT_Init_FreeType( &library );
    FT_Face     face;
    if ( error )
    {
      return 1;
    }

    if (tflag == FTW_F) {
        error = FT_New_Face( library,
                             fpath,
                             0,
                             &face );
        if ( error == FT_Err_Unknown_File_Format )
        {
            printf("%s not a font\n", fpath);
        }
        else if ( error )
        {
            printf("unknowm error %d\n", error);
        }
        else {
            printf("font %s | name %s | style %s\n", fpath, face->family_name, face->style_name);
            printf("%d\n", face->num_charmaps);
            FT_Select_Charmap(face, FT_ENCODING_UNICODE);
            FT_UInt gindex = 0;
            //FT_ULong  charcode = FT_Get_First_Char(face, &gindex);
            //while ( gindex != 0 )
            //{
            //    printf("index: %d | charcode %d\n", gindex, charcode);
            //    charcode = FT_Get_Next_Char( face, charcode, &gindex );
            //}
            FT_Done_Face    ( face );
            FT_Done_FreeType( library );
        }
    }
    return 0;           /* To tell nftw() to continue */
}

int
main(int argc, char *argv[])
{
    int flags = 0;

    if (argc > 2 && strchr(argv[2], 'd') != NULL)
        flags |= FTW_DEPTH;
    if (argc > 2 && strchr(argv[2], 'p') != NULL)
        flags |= FTW_PHYS;

    if (nftw((argc < 2) ? "." : argv[1], display_info, 20, flags)
            == -1) {
        perror("nftw");
        exit(EXIT_FAILURE);
    }

    exit(EXIT_SUCCESS);
}