/* Copyright (C) 1999-2003, 2005, 2008, 2012 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, see <https://www.gnu.org/licenses/>.  */

/* Creates the aliases2.h table. */

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

static unsigned int counter = 0;

static void emit_alias (FILE* out1, const char* tag, const char* alias, const char* c_name)
{
  fprintf(out1,"  S(%s_%u, \"",tag,counter);
  /* Output alias in upper case. */
  {
    const char* s = alias;
    for (; *s; s++) {
      unsigned char c = * (unsigned char *) s;
      if (c >= 0x80)
        exit(1);
      if (c >= 'a' && c <= 'z')
        c -= 'a'-'A';
      putc(c, out1);
    }
  }
  fprintf(out1,"\", ei_%s )\n", c_name);
  counter++;
}

static void emit_encoding (FILE* out1, FILE* out2, const char* tag, const char* const* names, size_t n, const char* c_name)
{
  fprintf(out2,"  (int)(long)&((struct stringpool2_t *)0)->stringpool_%s_%u,\n",tag,counter);
  for (; n > 0; names++, n--)
    emit_alias(out1, tag, *names, c_name);
}

int main (int argc, char* argv[])
{
  const char* tag;
  char* aliases_file_name;
  char* canonical_file_name;
  FILE* aliases_file;
  FILE* canonical_file;

  if (argc != 4) {
    fprintf(stderr, "Usage: genaliases2 tag aliases.h canonical.h\n");
    exit(1);
  }

  tag = argv[1];
  aliases_file_name = argv[2];
  canonical_file_name = argv[3];

  aliases_file = fopen(aliases_file_name, "w");
  if (aliases_file == NULL) {
    fprintf(stderr, "Could not open '%s' for writing\n", aliases_file_name);
    exit(1);
  }

  canonical_file = fopen(canonical_file_name, "w");
  if (canonical_file == NULL) {
    fprintf(stderr, "Could not open '%s' for writing\n", canonical_file_name);
    exit(1);
  }

#define DEFENCODING(xxx_names,xxx,xxx_ifuncs1,xxx_ifuncs2,xxx_ofuncs1,xxx_ofuncs2) \
  {                                                           \
    static const char* const names[] = BRACIFY xxx_names;     \
    emit_encoding(aliases_file,canonical_file,tag,names,sizeof(names)/sizeof(names[0]),#xxx); \
  }
#define BRACIFY(...) { __VA_ARGS__ }
#define DEFALIAS(xxx_alias,xxx) emit_alias(aliases_file,tag,xxx_alias,#xxx);
#ifdef USE_AIX
#include "encodings_aix.def"
#endif
#ifdef USE_OSF1
#include "encodings_osf1.def"
#endif
#ifdef USE_DOS
#include "encodings_dos.def"
#endif
#ifdef USE_EXTRA
#include "encodings_extra.def"
#endif
#undef DEFALIAS
#undef BRACIFY
#undef DEFENCODING
  if (ferror(aliases_file) || fclose(aliases_file))
    exit(1);
  if (ferror(canonical_file) || fclose(canonical_file))
    exit(1);
  exit(0);
}