/* Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.

   The GNU C 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 C 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 C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <argp.h>
#include <errno.h>
#include <fcntl.h>
#include <libintl.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef _POSIX2_LOCALEDEF
# include <sys/mman.h>
#endif
#include <sys/stat.h>

#include "error.h"
#include "charset.h"
#include "locfile.h"
#include "locales.h"


/* This is a special entry of the copylist.  For all categories we don't
   have a definition we use the data for the POSIX locale.  */
struct copy_def_list_t copy_posix =
{
  next: NULL,
  name: "POSIX",
  mask: (1 << LC_ALL) - 1,
  locale: NULL
};


/* List of copied locales.  */
struct copy_def_list_t *copy_list;

/* If this is defined be POSIX conform.  */
int posix_conformance;

/* If not zero give a lot more messages.  */
int verbose;

/* If not zero suppress warnings and information messages.  */
int be_quiet;

/* If not zero force output even if warning were issued.  */
static int force_output;

/* Name of the character map file.  */
static const char *charmap_file;

/* Name of the locale definition file.  */
static const char *input_file;

/* Name of the repertoire map file.  */
const char *repertoiremap;


/* Name and version of program.  */
static void print_version (FILE *stream, struct argp_state *state);
void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;

#define OPT_POSIX 1
#define OPT_QUIET 2

/* Definitions of arguments for argp functions.  */
static const struct argp_option options[] =
{
  { NULL, 0, NULL, 0, N_("Input Files:") },
  { "charmap", 'f', N_("FILE"), 0,
    N_("Symbolic character names defined in FILE") },
  { "inputfile", 'i', N_("FILE"), 0,
    N_("Source definitions are found in FILE") },
  { "repertoire-map", 'u', N_("FILE"), 0,
    N_("FILE contains mapping from symbolic names to UCS4 values") },

  { NULL, 0, NULL, 0, N_("Output control:") },
  { "force", 'c', NULL, 0,
    N_("Create output even if warning messages were issued") },
  { "posix", OPT_POSIX, NULL, 0, N_("Be strictly POSIX conform") },
  { "quiet", OPT_QUIET, NULL, 0,
    N_("Suppress warnings and information messages") },
  { "verbose", 'v', NULL, 0, N_("Print more messages") },
  { NULL, 0, NULL, 0, NULL }
};

/* Short description of program.  */
static const char doc[] = N_("Compile locale specification");

/* Strings for arguments in help texts.  */
static const char args_doc[] = N_("NAME");

/* Prototype for option handler.  */
static error_t parse_opt (int key, char *arg, struct argp_state *state);

/* Function to print some extra text in the help message.  */
static char *more_help (int key, const char *text, void *input);

/* Data structure to communicate with argp functions.  */
static struct argp argp =
{
  options, parse_opt, args_doc, doc, NULL, more_help
};


/* Prototypes for global functions.  */
void *xmalloc (size_t __n);

/* Prototypes for local functions.  */
static void error_print (void);
static const char *construct_output_path (char *path);
static const char *normalize_codeset (const char *codeset, size_t name_len);


int
main (int argc, char *argv[])
{
  const char *output_path;
  int cannot_write_why;
  struct charset_t *charset;
  struct localedef_t *localedef;
  struct copy_def_list_t *act_add_locdef;
  int remaining;

  /* Set initial values for global variables.  */
  posix_conformance = getenv ("POSIXLY_CORRECT") != NULL;
  error_print_progname = error_print;

  /* Set locale.  Do not set LC_ALL because the other categories must
     not be affected (according to POSIX.2).  */
  setlocale (LC_MESSAGES, "");
  setlocale (LC_CTYPE, "");

  /* Initialize the message catalog.  */
  textdomain (_libc_intl_domainname);

  /* Parse and process arguments.  */
  argp_err_exit_status = 4;
  argp_parse (&argp, argc, argv, 0, &remaining, NULL);

  /* POSIX.2 requires to be verbose about missing characters in the
     character map.  */
  verbose |= posix_conformance;

  if (argc - remaining != 1)
    {
      /* We need exactly one non-option parameter.  */
      argp_help (&argp, stdout, ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR,
		 program_invocation_short_name);
      exit (4);
    }

  /* The parameter describes the output path of the constructed files.
     If the described files cannot be written return a NULL pointer.  */
  output_path  = construct_output_path (argv[remaining]);
  cannot_write_why = errno;

  /* Now that the parameters are processed we have to reset the local
     ctype locale.  (P1003.2 4.35.5.2)  */
  setlocale (LC_CTYPE, "POSIX");

  /* Look whether the system really allows locale definitions.  POSIX
     defines error code 3 for this situation so I think it must be
     a fatal error (see P1003.2 4.35.8).  */
  if (sysconf (_SC_2_LOCALEDEF) < 0)
    error (3, 0, _("FATAL: system does not define `_POSIX2_LOCALEDEF'"));

  /* Process charmap file.  */
  charset = charmap_read (charmap_file);

  /* Now read the locale file.  */
  localedef = locfile_read (input_file, charset);
  if (localedef->failed != 0)
    error (4, errno, _("cannot open locale definition file `%s'"), input_file);

  /* Make sure all categories are defined.  */
  copy_posix.next = copy_list;
  copy_list = &copy_posix;

  /* Perhaps we saw some `copy' instructions.  Process the given list.
     We use a very simple algorithm: we look up the list from the
     beginning every time.  */
  do
    {
      int cat = 0;

      for (act_add_locdef = copy_list; act_add_locdef != NULL;
	   act_add_locdef = act_add_locdef->next)
	{
	  for (cat = LC_CTYPE; cat <= LC_MESSAGES; ++cat)
	    if ((act_add_locdef->mask & (1 << cat)) != 0)
	      {
		act_add_locdef->mask &= ~(1 << cat);
		break;
	      }
	  if (cat <= LC_MESSAGES)
	    break;
	}

      if (act_add_locdef != NULL)
	{
	  int avail = 0;

	  if (act_add_locdef->locale == NULL)
	    {
	      /* Saving the mask is an ugly trick to prevent the reader
		 from modifying `copy_posix' if we currently process it.  */
	      int save_mask = act_add_locdef->mask;
	      act_add_locdef->locale = locfile_read (act_add_locdef->name,
						     charset);
	      act_add_locdef->mask = save_mask;
	    }

	  if (! act_add_locdef->locale->failed)
	    {
	      avail = act_add_locdef->locale->categories[cat].generic != NULL;
	      if (avail)
		{
		  localedef->categories[cat].generic
		    = act_add_locdef->locale->categories[cat].generic;
		  localedef->avail |= 1 << cat;
		}
	    }

	  if (! avail)
	    {
	      static const char *locale_names[] =
	      {
		"LC_COLLATE", "LC_CTYPE", "LC_MONETARY",
		"LC_NUMERIC", "LC_TIME", "LC_MESSAGES"
	      };
	      char *fname;
	      int fd;
	      struct stat st;

	      asprintf (&fname, LOCALEDIR "/%s/%s", act_add_locdef->name,
			locale_names[cat]);
	      fd = open (fname, O_RDONLY);
	      if (fd == -1)
		{
		  free (fname);

		  asprintf (&fname, LOCALEDIR "/%s/%s/SYS_%s",
			    act_add_locdef->name, locale_names[cat],
			    locale_names[cat]);

		  fd = open (fname, O_RDONLY);
		  if (fd == -1)
		    error (5, 0, _("\
locale file `%s', used in `copy' statement, not found"),
			   act_add_locdef->name);
		}

	      if (fstat (fd, &st) < 0)
		error (5, errno, _("\
cannot `stat' locale file `%s'"),
		       fname);

	      localedef->len[cat] = st.st_size;
#ifdef _POSIX_MAPPED_FILES
	      localedef->categories[cat].generic
		= mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);

	      if (localedef->categories[cat].generic == MAP_FAILED)
#endif	/* _POSIX_MAPPED_FILES */
		{
		  size_t left = st.st_size;
		  void *read_ptr;

		  localedef->categories[cat].generic
		    = xmalloc (st.st_size);
		  read_ptr = localedef->categories[cat].generic;

		  do
		    {
		      long int n;
		      n = read (fd, read_ptr, left);
		      if (n == -1)
			error (5, errno, _("cannot read locale file `%s'"),
			       fname);
		      read_ptr += n;
		      left -= n;
		    }
		  while (left > 0);
		}

	      close (fd);
	      free (fname);

	      localedef->binary |= 1 << cat;
	    }
	}
    }
  while (act_add_locdef != NULL);

  /* Check the categories we processed in source form.  */
  check_all_categories (localedef, charset);

  /* We are now able to write the data files.  If warning were given we
     do it only if it is explicitly requested (--force).  */
  if (error_message_count == 0 || force_output != 0)
    {
      if (cannot_write_why != 0)
	error (4, cannot_write_why, _("cannot write output files to `%s'"),
	       output_path);
      else
	write_all_categories (localedef, charset, output_path);
    }
  else
    error (4, 0, _("no output file produced because warning were issued"));

  /* This exit status is prescribed by POSIX.2 4.35.7.  */
  exit (error_message_count != 0);
}


/* Handle program arguments.  */
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
  switch (key)
    {
    case OPT_QUIET:
      be_quiet = 1;
      break;
    case OPT_POSIX:
      posix_conformance = 1;
      break;
    case 'c':
      force_output = 1;
      break;
    case 'f':
      charmap_file = arg;
      break;
    case 'i':
      input_file = arg;
      break;
    case 'u':
      repertoiremap = arg;
      break;
    case 'v':
      verbose = 1;
      break;
    default:
      return ARGP_ERR_UNKNOWN;
    }
  return 0;
}


static char *
more_help (int key, const char *text, void *input)
{
  char *cp;

  switch (key)
    {
    case ARGP_KEY_HELP_EXTRA:
      /* We print some extra information.  */
      asprintf (&cp, gettext ("\
System's directory for character maps : %s\n\
                       repertoire maps: %s\n\
                       locale path    : %s\n\
%s"),
		CHARMAP_PATH, REPERTOIREMAP_PATH, LOCALE_PATH, gettext ("\
Report bugs using the `glibcbug' script to <bugs@gnu.org>.\n"));
      return cp;
    default:
      break;
    }
  return (char *) text;
}

/* Print the version information.  */
static void
print_version (FILE *stream, struct argp_state *state)
{
  fprintf (stream, "localedef (GNU %s) %s\n", PACKAGE, VERSION);
  fprintf (stream, gettext ("\
Copyright (C) %s Free Software Foundation, Inc.\n\
This is free software; see the source for copying conditions.  There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
"), "1999");
  fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
}


void
def_to_process (const char *name, int category)
{
  struct copy_def_list_t *new, **rp;

  for (rp = &copy_list; *rp != NULL; rp = &(*rp)->next)
    if (strcmp (name, (*rp)->name) == 0)
      break;

  if (*rp == NULL)
    {
      size_t cnt;

      *rp = (struct copy_def_list_t *) xmalloc (sizeof (**rp));

      (*rp)->next = NULL;
      (*rp)->name = name;
      (*rp)->mask = 0;
      (*rp)->locale = NULL;

      for (cnt = 0; cnt < 6; ++cnt)
	{
	  (*rp)->binary[cnt].data = NULL;
	  (*rp)->binary[cnt].len = 0;
	}
    }
  new = *rp;

  if ((new->mask & category) != 0)
    /* We already have the information.  This cannot happen.  */
    error (5, 0, _("\
category data requested more than once: should not happen"));

  new->mask |= category;
}


/* The address of this function will be assigned to the hook in the error
   functions.  */
static void
error_print ()
{
  /* We don't want the program name to be printed in messages.  Emacs'
     compile.el does not like this.  */
}


/* The parameter to localedef describes the output path.  If it does
   contain a '/' character it is a relative path.  Otherwise it names the
   locale this definition is for.  */
static const char *
construct_output_path (char *path)
{
  const char *normal = NULL;
  char *result;

  if (strchr (path, '/') == NULL)
    {
      /* This is a system path.  First examine whether the locale name
	 contains a reference to the codeset.  This should be
	 normalized.  */
      char *startp, *endp;

      startp = path;
      /* We must be prepared for finding a CEN name or a location of
	 the introducing `.' where it is not possible anymore.  */
      while (*startp != '\0' && *startp != '@' && *startp != '.'
	     && *startp != '+' && *startp != ',')
	++startp;
      if (*startp == '.')
	{
	  /* We found a codeset specification.  Now find the end.  */
	  endp = ++startp;
	  while (*endp != '\0' && *endp != '@')
	    ++endp;

	  if (endp > startp)
	    normal = normalize_codeset (startp, endp - startp);
	}
      else
	/* This is to keep gcc quiet.  */
	endp = NULL;

      /* We put an additional '\0' at the end of the string because at
	 the end of the function we need another byte for the trailing
	 '/'.  */
      if (normal == NULL)
	asprintf (&result, "%s/%s%c", LOCALEDIR, path, '\0');
      else
	asprintf (&result, "%s/%.*s%s%s%c", LOCALEDIR, startp - path, path,
		  normal, endp, '\0');
    }
  else
    {
      /* This is a user path.  Please note the additional byte in the
	 memory allocation.  */
      result = xmalloc (strlen (path) + 2);
      strcpy (result, path);
    }

  errno = 0;

  if (euidaccess (result, W_OK) == -1)
    /* Perhaps the directory does not exist now.  Try to create it.  */
    if (errno == ENOENT)
      {
	errno = 0;
	mkdir (result, 0777);
      }

  strcat (result, "/");

  return result;
}

/* Normalize codeset name.  There is no standard for the codeset
   names.  Normalization allows the user to use any of the common
   names.  */
static const char *
normalize_codeset (codeset, name_len)
     const char *codeset;
     size_t name_len;
{
  int len = 0;
  int only_digit = 1;
  char *retval;
  char *wp;
  size_t cnt;

  for (cnt = 0; cnt < name_len; ++cnt)
    if (isalnum (codeset[cnt]))
      {
	++len;

	if (isalpha (codeset[cnt]))
	  only_digit = 0;
      }

  retval = (char *) malloc ((only_digit ? 3 : 0) + len + 1);

  if (retval != NULL)
    {
      if (only_digit)
	wp = stpcpy (retval, "iso");
      else
	wp = retval;

      for (cnt = 0; cnt < name_len; ++cnt)
	if (isalpha (codeset[cnt]))
	  *wp++ = _tolower (codeset[cnt]);
	else if (isdigit (codeset[cnt]))
	  *wp++ = codeset[cnt];

      *wp = '\0';
    }

  return (const char *) retval;
}
