/* Copyright (C) 2000-2002, 2004-2005 Free Software Foundation, Inc.
   This file is part of the GNU LIBICONV Library.

   The GNU LIBICONV Library is free software; you can redistribute it
   and/or modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.

   The GNU LIBICONV Library is distributed in the hope that it will be
   useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
   Fifth Floor, Boston, MA 02110-1301, USA.  */

/* Create a table from Unicode to CHARSET. */

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

#include <iconv-internal/iconv.h>

#ifdef __riscos__
#define ALIASES_FILE "Files.Aliases"
#else
#define ALIASES_FILE "Files/Aliases"
#endif

int main (int argc, char* argv[])
{
  const char* charset;
  iconv_t cd;
  int bmp_only;
  const char *ucpath;
  int alen;
  char aliases[4096];

  if (argc != 2) {
    fprintf(stderr,"Usage: table-to charset\n");
    exit(1);
  }
  charset = argv[1];

  /* ensure the !Unicode resource exists */
#ifdef __riscos__
  ucpath = "Unicode:");
#else
  ucpath = getenv("UNICODE_DIR");
#endif

  if (ucpath == NULL) {
    fprintf(stderr, "Unicode resource not found\n");
    exit(1);
  }

  strncpy(aliases, ucpath, sizeof(aliases));
  alen = strlen(ucpath);
#ifndef __riscos__
  if (aliases[alen - 1] != '/') {
    strncat(aliases, "/", sizeof(aliases) - alen - 1);
    alen += 1;
  }
#endif
  strncat(aliases, ALIASES_FILE, sizeof(aliases) - alen - 1);
  aliases[sizeof(aliases) - 1] = '\0';

  if (iconv_initialise(aliases) == 0) {
    fprintf(stderr, "Failed initialising iconv library\n");
    exit(1);
  }

  cd = iconv_open(charset,"UCS-4-INTERNAL");
  if (cd == (iconv_t)(-1)) {
    perror("iconv_open");
    exit(1);
  }

  /* When testing UTF-8, stop at 0x10000, otherwise the output file gets too
     big. */
  bmp_only = (strcmp(charset,"UTF-8") == 0);

  {
    unsigned int i;
    unsigned char buf[10];
    for (i = 0; i < (bmp_only ? 0x10000 : 0x110000); i++) {
      unsigned int in = i;
      const char* inbuf = (const char*) &in;
      size_t inbytesleft = sizeof(unsigned int);
      char* outbuf = (char*)buf;
      size_t outbytesleft = sizeof(buf);
      size_t result;
      size_t result2 = 0;
      iconv(cd,NULL,NULL,NULL,NULL);
      result = iconv(cd,(char**)&inbuf,&inbytesleft,&outbuf,&outbytesleft);
      if (result != (size_t)(-1))
        result2 = iconv(cd,NULL,NULL,&outbuf,&outbytesleft);
      if (result == (size_t)(-1) || result2 == (size_t)(-1)) {
        if (errno != EILSEQ && !(errno == EINVAL && in == 0xfeff)) {
          int saved_errno = errno;
          fprintf(stderr,"0x%02X: iconv error: ",i);
          errno = saved_errno;
          perror("");
          exit(1);
        }
      } else if (result == 0) /* ignore conversions with transliteration */ {
        if (inbytesleft == 0 && outbytesleft < sizeof(buf)) {
          unsigned int jmax = sizeof(buf) - outbytesleft;
          unsigned int j;
          printf("0x");
          for (j = 0; j < jmax; j++)
            printf("%02X",buf[j]);
          printf("\t0x%04X\n",i);
        } else if (inbytesleft == 0 && i >= 0xe0000 && i < 0xe0080) {
          /* Language tags may silently be dropped. */
        } else {
          fprintf(stderr,"0x%02X: inbytes = %ld, outbytes = %ld\n",i,(long)(sizeof(unsigned int)-inbytesleft),(long)(sizeof(buf)-outbytesleft));
          exit(1);
        }
      }
    }
  }

  if (iconv_close(cd) < 0) {
    perror("iconv_close");
    exit(1);
  }

  iconv_finalise();

  if (ferror(stdin) || ferror(stdout) || fclose(stdout)) {
    fprintf(stderr,"I/O error\n");
    exit(1);
  }

  exit(0);
}