utf8.h

#ifndef _UTF8_UTILS_
#define _UTF8_UTILS_

// Copyright Patrick Louis
// https: // venam.net/blog/unix/2018/09/02/fonts-xcb.html
// https: // github.com/venam/fonts-for-xcb

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <fontconfig/fontconfig.h>

struct utf_holder {
  FcChar32 *str;
  unsigned int length;
};
struct utf_holder char_to_uint32(char *str);
void utf_holder_destroy(struct utf_holder holder);

struct utf_holder char_to_uint32(char *str) {
  struct utf_holder holder;
  FcChar32 *output = NULL;
  int length = 0, shift = 0;

  // there should be less than or same as the strlen of str
  output = (FcChar32 *)malloc(sizeof(FcChar32) * strlen(str));
  if (!output) {
    puts("couldn't allocate mem for char_to_uint32");
  }

  while (*(str + shift)) {
    shift += FcUtf8ToUcs4((FcChar8 *)(str + shift), output + length,
                          strlen(str) - shift);
    length++;
  }

  holder.length = length;
  holder.str = output;

  return holder;
}

void utf_holder_destroy(struct utf_holder holder) { free(holder.str); }

#endif