GNU gperf is a perfect hash function generator

GNU gperf

// lang-utf8.gperf
struct language {
  const char *foreign_name;
  const char *english_name;
  const char *locale;
};
%%
አማርኛ,       "Amharic",    NULL
česky,      "Czech",      "cs_CZ.UTF-8"
Dansk,      "Danish",     "da_DK.UTF-8"
English,    "English",    "en_GB.UTF-8"
Suomi,      "Finnish",    "fi_FI.UTF-8"
Français,   "French",     "fr_FR.UTF-8"
Deutsch,    "German",     "de_DE.UTF-8"
Ελληνικά,   "Greek",      "el_GR.UTF-8"
עברית,      "Hebrew",     "he_IL.UTF-8"
Italiano,   "Italian",    "it_IT.UTF-8"
Norsk,      "Norwegian",  "no_NO.UTF-8"
Русский,    "Russian",    "ru_RU.UTF-8"
Español,    "Spanish",    "es_ES.UTF-8"
Svenska,    "Swedish",    "sv_SE.UTF-8"
ภาษาไทย,    "Thai",       "th_TH.UTF-8"
Türkçe,     "Turkish",    "tr_TR.UTF-8"
Tiếng Việt, "Vietnamese", "vi_VN.UTF-8"
日本語,     "Japanese",   "ja_JP.UTF-8"
繁體中文,   "Chinese",    "zh_TW.UTF-8"
한글,       "Korean",     "ko_KR.UTF-8"
%%

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

int main(int argc, char* argv[]) {
  if (argc < 2) {
    return EXIT_FAILURE;
  }
  char* str = argv[1];
  struct language * l = in_word_set(str, strlen(str));
  if (l != NULL) {
    printf("foreign_name: %s, english_name: %s, locale: %s\n",
        l->foreign_name,  l->english_name, l->locale);
  } else {
    printf("NULL\n");
  }
  return EXIT_SUCCESS;
}
/*
$ gperf  -k1 -t -I -K foreign_name < lang-utf8.gperf > lang-utf8.c 
$ gcc -o lang-utf8 lang-utf8.c
$ ./lang-utf8 繁體中文
foreign_name: 繁體中文, english_name: Chinese, locale: zh_TW.UTF-8
*/