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[deliverable/binutils-gdb.git] / binutils / windres.c

/* windres.c -- a program to manipulate Windows resources
   Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007
   Free Software Foundation, Inc.
   Written by Ian Lance Taylor, Cygnus Support.

   This file is part of GNU Binutils.

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

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */

/* This program can read and write Windows resources in various
   formats.  In particular, it can act like the rc resource compiler
   program, and it can act like the cvtres res to COFF conversion
   program.

   It is based on information taken from the following sources:

   * Microsoft documentation.

   * The rcl program, written by Gunther Ebert
     <gunther.ebert@ixos-leipzig.de>.

   * The res2coff program, written by Pedro A. Aranda <paag@tid.es>.  */

#include "sysdep.h"
#include <assert.h>
#include <time.h>
#include "bfd.h"
#include "getopt.h"
#include "libiberty.h"
#include "safe-ctype.h"
#include "obstack.h"
#include "bucomm.h"
#include "windres.h"

/* Used by resrc.c at least.  */

int verbose = 0;

/* An enumeration of format types.  */

enum res_format
{
  /* Unknown format.  */
  RES_FORMAT_UNKNOWN,
  /* Textual RC file.  */
  RES_FORMAT_RC,
  /* Binary RES file.  */
  RES_FORMAT_RES,
  /* COFF file.  */
  RES_FORMAT_COFF
};

/* A structure used to map between format types and strings.  */

struct format_map
{
  const char *name;
  enum res_format format;
};

/* A mapping between names and format types.  */

static const struct format_map format_names[] =
{
  { "rc", RES_FORMAT_RC },
  { "res", RES_FORMAT_RES },
  { "coff", RES_FORMAT_COFF },
  { NULL, RES_FORMAT_UNKNOWN }
};

/* A mapping from file extensions to format types.  */

static const struct format_map format_fileexts[] =
{
  { "rc", RES_FORMAT_RC },
  { "res", RES_FORMAT_RES },
  { "exe", RES_FORMAT_COFF },
  { "obj", RES_FORMAT_COFF },
  { "o", RES_FORMAT_COFF },
  { NULL, RES_FORMAT_UNKNOWN }
};

/* A list of include directories.  */

struct include_dir
{
  struct include_dir *next;
  char *dir;
};

static struct include_dir *include_dirs;

/* Static functions.  */

static void res_init (void);
static int extended_menuitems (const struct menuitem *);
static enum res_format format_from_name (const char *, int);
static enum res_format format_from_filename (const char *, int);
static void usage (FILE *, int);
static int cmp_res_entry (const void *, const void *);
static struct res_directory *sort_resources (struct res_directory *);
static void reswr_init (void);
static const char * quot (const char *);
\f
/* When we are building a resource tree, we allocate everything onto
   an obstack, so that we can free it all at once if we want.  */

#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free

/* The resource building obstack.  */

static struct obstack res_obstack;

/* Initialize the resource building obstack.  */

static void
res_init (void)
{
  obstack_init (&res_obstack);
}

/* Allocate space on the resource building obstack.  */

void *
res_alloc (size_t bytes)
{
  return (void *) obstack_alloc (&res_obstack, bytes);
}

/* We also use an obstack to save memory used while writing out a set
   of resources.  */

static struct obstack reswr_obstack;

/* Initialize the resource writing obstack.  */

static void
reswr_init (void)
{
  obstack_init (&reswr_obstack);
}

/* Allocate space on the resource writing obstack.  */

void *
reswr_alloc (size_t bytes)
{
  return (void *) obstack_alloc (&reswr_obstack, bytes);
}
\f
/* Open a file using the include directory search list.  */

FILE *
open_file_search (const char *filename, const char *mode, const char *errmsg,
		  char **real_filename)
{
  FILE *e;
  struct include_dir *d;

  e = fopen (filename, mode);
  if (e != NULL)
    {
      *real_filename = xstrdup (filename);
      return e;
    }

  if (errno == ENOENT)
    {
      for (d = include_dirs; d != NULL; d = d->next)
	{
	  char *n;

	  n = (char *) xmalloc (strlen (d->dir) + strlen (filename) + 2);
	  sprintf (n, "%s/%s", d->dir, filename);
	  e = fopen (n, mode);
	  if (e != NULL)
	    {
	      *real_filename = n;
	      return e;
	    }

	  if (errno != ENOENT)
	    break;
	}
    }

  fatal (_("can't open %s `%s': %s"), errmsg, filename, strerror (errno));

  /* Return a value to avoid a compiler warning.  */
  return NULL;
}
\f
/* Compare two resource ID's.  We consider name entries to come before
   numeric entries, because that is how they appear in the COFF .rsrc
   section.  */

int
res_id_cmp (struct res_id a, struct res_id b)
{
  if (! a.named)
    {
      if (b.named)
	return 1;
      if (a.u.id > b.u.id)
	return 1;
      else if (a.u.id < b.u.id)
	return -1;
      else
	return 0;
    }
  else
    {
      unichar *as, *ase, *bs, *bse;

      if (! b.named)
	return -1;

      as = a.u.n.name;
      ase = as + a.u.n.length;
      bs = b.u.n.name;
      bse = bs + b.u.n.length;

      while (as < ase)
	{
	  int i;

	  if (bs >= bse)
	    return 1;
	  i = (int) *as - (int) *bs;
	  if (i != 0)
	    return i;
	  ++as;
	  ++bs;
	}

      if (bs < bse)
	return -1;

      return 0;
    }
}

/* Print a resource ID.  */

void
res_id_print (FILE *stream, struct res_id id, int quote)
{
  if (! id.named)
    fprintf (stream, "%lu", id.u.id);
  else
    {
      if (quote)
	putc ('"', stream);
      unicode_print (stream, id.u.n.name, id.u.n.length);
      if (quote)
	putc ('"', stream);
    }
}

/* Print a list of resource ID's.  */

void
res_ids_print (FILE *stream, int cids, const struct res_id *ids)
{
  int i;

  for (i = 0; i < cids; i++)
    {
      res_id_print (stream, ids[i], 1);
      if (i + 1 < cids)
	fprintf (stream, ": ");
    }
}

/* Convert an ASCII string to a resource ID.  */

void
res_string_to_id (struct res_id *res_id, const char *string)
{
  res_id->named = 1;
  unicode_from_ascii (&res_id->u.n.length, &res_id->u.n.name, string);
}

/* Define a resource.  The arguments are the resource tree, RESOURCES,
   and the location at which to put it in the tree, CIDS and IDS.
   This returns a newly allocated res_resource structure, which the
   caller is expected to initialize.  If DUPOK is non-zero, then if a
   resource with this ID exists, it is returned.  Otherwise, a warning
   is issued, and a new resource is created replacing the existing
   one.  */

struct res_resource *
define_resource (struct res_directory **resources, int cids,
		 const struct res_id *ids, int dupok)
{
  struct res_entry *re = NULL;
  int i;

  assert (cids > 0);
  for (i = 0; i < cids; i++)
    {
      struct res_entry **pp;

      if (*resources == NULL)
	{
	  static unsigned long timeval;

	  /* Use the same timestamp for every resource created in a
             single run.  */
	  if (timeval == 0)
	    timeval = time (NULL);

	  *resources = ((struct res_directory *)
			res_alloc (sizeof **resources));
	  (*resources)->characteristics = 0;
	  (*resources)->time = timeval;
	  (*resources)->major = 0;
	  (*resources)->minor = 0;
	  (*resources)->entries = NULL;
	}

      for (pp = &(*resources)->entries; *pp != NULL; pp = &(*pp)->next)
	if (res_id_cmp ((*pp)->id, ids[i]) == 0)
	  break;

      if (*pp != NULL)
	re = *pp;
      else
	{
	  re = (struct res_entry *) res_alloc (sizeof *re);
	  re->next = NULL;
	  re->id = ids[i];
	  if ((i + 1) < cids)
	    {
	      re->subdir = 1;
	      re->u.dir = NULL;
	    }
	  else
	    {
	      re->subdir = 0;
	      re->u.res = NULL;
	    }

	  *pp = re;
	}

      if ((i + 1) < cids)
	{
	  if (! re->subdir)
	    {
	      fprintf (stderr, "%s: ", program_name);
	      res_ids_print (stderr, i, ids);
	      fprintf (stderr, _(": expected to be a directory\n"));
	      xexit (1);
	    }

	  resources = &re->u.dir;
	}
    }

  if (re->subdir)
    {
      fprintf (stderr, "%s: ", program_name);
      res_ids_print (stderr, cids, ids);
      fprintf (stderr, _(": expected to be a leaf\n"));
      xexit (1);
    }

  if (re->u.res != NULL)
    {
      if (dupok)
	return re->u.res;

      fprintf (stderr, _("%s: warning: "), program_name);
      res_ids_print (stderr, cids, ids);
      fprintf (stderr, _(": duplicate value\n"));
    }

  re->u.res = ((struct res_resource *)
	       res_alloc (sizeof (struct res_resource)));
  memset (re->u.res, 0, sizeof (struct res_resource));

  re->u.res->type = RES_TYPE_UNINITIALIZED;
  return re->u.res;
}

/* Define a standard resource.  This is a version of define_resource
   that just takes type, name, and language arguments.  */

struct res_resource *
define_standard_resource (struct res_directory **resources, int type,
			  struct res_id name, int language, int dupok)
{
  struct res_id a[3];

  a[0].named = 0;
  a[0].u.id = type;
  a[1] = name;
  a[2].named = 0;
  a[2].u.id = language;
  return define_resource (resources, 3, a, dupok);
}

/* Comparison routine for resource sorting.  */

static int
cmp_res_entry (const void *p1, const void *p2)
{
  const struct res_entry **re1, **re2;

  re1 = (const struct res_entry **) p1;
  re2 = (const struct res_entry **) p2;
  return res_id_cmp ((*re1)->id, (*re2)->id);
}

/* Sort the resources.  */

static struct res_directory *
sort_resources (struct res_directory *resdir)
{
  int c, i;
  struct res_entry *re;
  struct res_entry **a;

  if (resdir->entries == NULL)
    return resdir;

  c = 0;
  for (re = resdir->entries; re != NULL; re = re->next)
    ++c;

  /* This is a recursive routine, so using xmalloc is probably better
     than alloca.  */
  a = (struct res_entry **) xmalloc (c * sizeof (struct res_entry *));

  for (i = 0, re = resdir->entries; re != NULL; re = re->next, i++)
    a[i] = re;

  qsort (a, c, sizeof (struct res_entry *), cmp_res_entry);

  resdir->entries = a[0];
  for (i = 0; i < c - 1; i++)
    a[i]->next = a[i + 1];
  a[i]->next = NULL;

  free (a);

  /* Now sort the subdirectories.  */

  for (re = resdir->entries; re != NULL; re = re->next)
    if (re->subdir)
      re->u.dir = sort_resources (re->u.dir);

  return resdir;
}
\f
/* Return whether the dialog resource DIALOG is a DIALOG or a
   DIALOGEX.  */

int
extended_dialog (const struct dialog *dialog)
{
  const struct dialog_control *c;

  if (dialog->ex != NULL)
    return 1;

  for (c = dialog->controls; c != NULL; c = c->next)
    if (c->data != NULL || c->help != 0)
      return 1;

  return 0;
}

/* Return whether MENUITEMS are a MENU or a MENUEX.  */

int
extended_menu (const struct menu *menu)
{
  return extended_menuitems (menu->items);
}

static int
extended_menuitems (const struct menuitem *menuitems)
{
  const struct menuitem *mi;

  for (mi = menuitems; mi != NULL; mi = mi->next)
    {
      if (mi->help != 0 || mi->state != 0)
	return 1;
      if (mi->popup != NULL && mi->id != 0)
	return 1;
      if ((mi->type
	   & ~ (MENUITEM_CHECKED
		| MENUITEM_GRAYED
		| MENUITEM_HELP
		| MENUITEM_INACTIVE
		| MENUITEM_MENUBARBREAK
		| MENUITEM_MENUBREAK))
	  != 0)
	return 1;
      if (mi->popup != NULL)
	{
	  if (extended_menuitems (mi->popup))
	    return 1;
	}
    }

  return 0;
}
\f
/* Convert a string to a format type, or exit if it can't be done.  */

static enum res_format
format_from_name (const char *name, int exit_on_error)
{
  const struct format_map *m;

  for (m = format_names; m->name != NULL; m++)
    if (strcasecmp (m->name, name) == 0)
      break;

  if (m->name == NULL && exit_on_error)
    {
      non_fatal (_("unknown format type `%s'"), name);
      fprintf (stderr, _("%s: supported formats:"), program_name);
      for (m = format_names; m->name != NULL; m++)
	fprintf (stderr, " %s", m->name);
      fprintf (stderr, "\n");
      xexit (1);
    }

  return m->format;
}

/* Work out a format type given a file name.  If INPUT is non-zero,
   it's OK to look at the file itself.  */

static enum res_format
format_from_filename (const char *filename, int input)
{
  const char *ext;
  FILE *e;
  unsigned char b1, b2, b3, b4, b5;
  int magic;

  /* If we have an extension, see if we recognize it as implying a
     particular format.  */
  ext = strrchr (filename, '.');
  if (ext != NULL)
    {
      const struct format_map *m;

      ++ext;
      for (m = format_fileexts; m->name != NULL; m++)
	if (strcasecmp (m->name, ext) == 0)
	  return m->format;
    }

  /* If we don't recognize the name of an output file, assume it's a
     COFF file.  */
  if (! input)
    return RES_FORMAT_COFF;

  /* Read the first few bytes of the file to see if we can guess what
     it is.  */
  e = fopen (filename, FOPEN_RB);
  if (e == NULL)
    fatal ("%s: %s", filename, strerror (errno));

  b1 = getc (e);
  b2 = getc (e);
  b3 = getc (e);
  b4 = getc (e);
  b5 = getc (e);

  fclose (e);

  /* A PE executable starts with 0x4d 0x5a.  */
  if (b1 == 0x4d && b2 == 0x5a)
    return RES_FORMAT_COFF;

  /* A COFF .o file starts with a COFF magic number.  */
  magic = (b2 << 8) | b1;
  switch (magic)
    {
    case 0x14c: /* i386 */
    case 0x166: /* MIPS */
    case 0x184: /* Alpha */
    case 0x268: /* 68k */
    case 0x1f0: /* PowerPC */
    case 0x290: /* PA */
      return RES_FORMAT_COFF;
    }

  /* A RES file starts with 0x0 0x0 0x0 0x0 0x20 0x0 0x0 0x0.  */
  if (b1 == 0 && b2 == 0 && b3 == 0 && b4 == 0 && b5 == 0x20)
    return RES_FORMAT_RES;

  /* If every character is printable or space, assume it's an RC file.  */
  if ((ISPRINT (b1) || ISSPACE (b1))
      && (ISPRINT (b2) || ISSPACE (b2))
      && (ISPRINT (b3) || ISSPACE (b3))
      && (ISPRINT (b4) || ISSPACE (b4))
      && (ISPRINT (b5) || ISSPACE (b5)))
    return RES_FORMAT_RC;

  /* Otherwise, we give up.  */
  fatal (_("can not determine type of file `%s'; use the -J option"),
	 filename);

  /* Return something to silence the compiler warning.  */
  return RES_FORMAT_UNKNOWN;
}

/* Print a usage message and exit.  */

static void
usage (FILE *stream, int status)
{
  fprintf (stream, _("Usage: %s [option(s)] [input-file] [output-file]\n"),
	   program_name);
  fprintf (stream, _(" The options are:\n\
  -i --input=<file>            Name input file\n\
  -o --output=<file>           Name output file\n\
  -J --input-format=<format>   Specify input format\n\
  -O --output-format=<format>  Specify output format\n\
  -F --target=<target>         Specify COFF target\n\
     --preprocessor=<program>  Program to use to preprocess rc file\n\
  -I --include-dir=<dir>       Include directory when preprocessing rc file\n\
  -D --define <sym>[=<val>]    Define SYM when preprocessing rc file\n\
  -U --undefine <sym>          Undefine SYM when preprocessing rc file\n\
  -v --verbose                 Verbose - tells you what it's doing\n\
  -l --language=<val>          Set language when reading rc file\n\
     --use-temp-file           Use a temporary file instead of popen to read\n\
                               the preprocessor output\n\
     --no-use-temp-file        Use popen (default)\n"));
#ifdef YYDEBUG
  fprintf (stream, _("\
     --yydebug                 Turn on parser debugging\n"));
#endif
  fprintf (stream, _("\
  -r                           Ignored for compatibility with rc\n\
  @<file>                      Read options from <file>\n\
  -h --help                    Print this help message\n\
  -V --version                 Print version information\n"));
  fprintf (stream, _("\
FORMAT is one of rc, res, or coff, and is deduced from the file name\n\
extension if not specified.  A single file name is an input file.\n\
No input-file is stdin, default rc.  No output-file is stdout, default rc.\n"));

  list_supported_targets (program_name, stream);

  if (REPORT_BUGS_TO[0] && status == 0)
    fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);

  exit (status);
}

/* Quote characters that will confuse the shell when we run the preprocessor.  */

static const char *
quot (const char *string)
{
  static char *buf = 0;
  static int buflen = 0;
  int slen = strlen (string);
  const char *src;
  char *dest;

  if ((buflen < slen * 2 + 2) || !buf)
    {
      buflen = slen * 2 + 2;
      if (buf)
	free (buf);
      buf = (char *) xmalloc (buflen);
    }

  for (src=string, dest=buf; *src; src++, dest++)
    {
      if (*src == '(' || *src == ')' || *src == ' ')
	*dest++ = '\\';
      *dest = *src;
    }
  *dest = 0;
  return buf;
}

/* Long options.  */

/* 150 isn't special; it's just an arbitrary non-ASCII char value.  */

#define OPTION_PREPROCESSOR	150
#define OPTION_USE_TEMP_FILE	(OPTION_PREPROCESSOR + 1)
#define OPTION_NO_USE_TEMP_FILE	(OPTION_USE_TEMP_FILE + 1)
#define OPTION_YYDEBUG		(OPTION_NO_USE_TEMP_FILE + 1)

static const struct option long_options[] =
{
  {"input", required_argument, 0, 'i'},
  {"output", required_argument, 0, 'o'},
  {"input-format", required_argument, 0, 'J'},
  {"output-format", required_argument, 0, 'O'},
  {"target", required_argument, 0, 'F'},
  {"preprocessor", required_argument, 0, OPTION_PREPROCESSOR},
  {"include-dir", required_argument, 0, 'I'},
  {"define", required_argument, 0, 'D'},
  {"undefine", required_argument, 0, 'U'},
  {"verbose", no_argument, 0, 'v'},
  {"language", required_argument, 0, 'l'},
  {"use-temp-file", no_argument, 0, OPTION_USE_TEMP_FILE},
  {"no-use-temp-file", no_argument, 0, OPTION_NO_USE_TEMP_FILE},
  {"yydebug", no_argument, 0, OPTION_YYDEBUG},
  {"version", no_argument, 0, 'V'},
  {"help", no_argument, 0, 'h'},
  {0, no_argument, 0, 0}
};

/* This keeps gcc happy when using -Wmissing-prototypes -Wstrict-prototypes.  */
int main (int, char **);

/* The main function.  */

int
main (int argc, char **argv)
{
  int c;
  char *input_filename;
  char *output_filename;
  enum res_format input_format;
  enum res_format input_format_tmp;
  enum res_format output_format;
  char *target;
  char *preprocessor;
  char *preprocargs;
  const char *quotedarg;
  int language;
  struct res_directory *resources;
  int use_temp_file;

#if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
  setlocale (LC_MESSAGES, "");
#endif
#if defined (HAVE_SETLOCALE)
  setlocale (LC_CTYPE, "");
#endif
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  program_name = argv[0];
  xmalloc_set_program_name (program_name);

  expandargv (&argc, &argv);

  bfd_init ();
  set_default_bfd_target ();

  res_init ();

  input_filename = NULL;
  output_filename = NULL;
  input_format = RES_FORMAT_UNKNOWN;
  output_format = RES_FORMAT_UNKNOWN;
  target = NULL;
  preprocessor = NULL;
  preprocargs = NULL;
  language = 0x409;   /* LANG_ENGLISH, SUBLANG_ENGLISH_US.  */
  use_temp_file = 0;

  while ((c = getopt_long (argc, argv, "f:i:l:o:I:J:O:F:D:U:rhHvV", long_options,
			   (int *) 0)) != EOF)
    {
      switch (c)
	{
	case 'i':
	  input_filename = optarg;
	  break;

	case 'f':
	  /* For compatibility with rc we accept "-fo <name>" as being the
	     equivalent of "-o <name>".  We do not advertise this fact
	     though, as we do not want users to use non-GNU like command
	     line switches.  */
	  if (*optarg != 'o')
	    fatal (_("invalid option -f\n"));
	  optarg++;
	  if (* optarg == 0)
	    {
	      if (optind == argc)
		fatal (_("No filename following the -fo option.\n"));
	      optarg = argv [optind++];
	    }
	  /* Fall through.  */

	case 'o':
	  output_filename = optarg;
	  break;

	case 'J':
	  input_format = format_from_name (optarg, 1);
	  break;

	case 'O':
	  output_format = format_from_name (optarg, 1);
	  break;

	case 'F':
	  target = optarg;
	  break;

	case OPTION_PREPROCESSOR:
	  preprocessor = optarg;
	  break;

	case 'D':
	case 'U':
	  if (preprocargs == NULL)
	    {
	      quotedarg = quot (optarg);
	      preprocargs = xmalloc (strlen (quotedarg) + 3);
	      sprintf (preprocargs, "-%c%s", c, quotedarg);
	    }
	  else
	    {
	      char *n;

	      quotedarg = quot (optarg);
	      n = xmalloc (strlen (preprocargs) + strlen (quotedarg) + 4);
	      sprintf (n, "%s -%c%s", preprocargs, c, quotedarg);
	      free (preprocargs);
	      preprocargs = n;
	    }
	  break;

	case 'r':
	  /* Ignored for compatibility with rc.  */
	  break;

	case 'v':
	  verbose ++;
	  break;

	case 'I':
	  /* For backward compatibility, should be removed in the future.  */
	  input_format_tmp = format_from_name (optarg, 0);
	  if (input_format_tmp != RES_FORMAT_UNKNOWN)
	    {
	      fprintf (stderr, _("Option -I is deprecated for setting the input format, please use -J instead.\n"));
	      input_format = input_format_tmp;
	      break;
	    }

	  if (preprocargs == NULL)
	    {
	      quotedarg = quot (optarg);
	      preprocargs = xmalloc (strlen (quotedarg) + 3);
	      sprintf (preprocargs, "-I%s", quotedarg);
	    }
	  else
	    {
	      char *n;

	      quotedarg = quot (optarg);
	      n = xmalloc (strlen (preprocargs) + strlen (quotedarg) + 4);
	      sprintf (n, "%s -I%s", preprocargs, quotedarg);
	      free (preprocargs);
	      preprocargs = n;
	    }

	  {
	    struct include_dir *n, **pp;

	    n = (struct include_dir *) xmalloc (sizeof *n);
	    n->next = NULL;
	    n->dir = optarg;

	    for (pp = &include_dirs; *pp != NULL; pp = &(*pp)->next)
	      ;
	    *pp = n;
	  }

	  break;

	case 'l':
	  language = strtol (optarg, (char **) NULL, 16);
	  break;

	case OPTION_USE_TEMP_FILE:
	  use_temp_file = 1;
	  break;

	case OPTION_NO_USE_TEMP_FILE:
	  use_temp_file = 0;
	  break;

#ifdef YYDEBUG
	case OPTION_YYDEBUG:
	  yydebug = 1;
	  break;
#endif

	case 'h':
	case 'H':
	  usage (stdout, 0);
	  break;

	case 'V':
	  print_version ("windres");
	  break;

	default:
	  usage (stderr, 1);
	  break;
	}
    }

  if (input_filename == NULL && optind < argc)
    {
      input_filename = argv[optind];
      ++optind;
    }

  if (output_filename == NULL && optind < argc)
    {
      output_filename = argv[optind];
      ++optind;
    }

  if (argc != optind)
    usage (stderr, 1);

  if (input_format == RES_FORMAT_UNKNOWN)
    {
      if (input_filename == NULL)
	input_format = RES_FORMAT_RC;
      else
	input_format = format_from_filename (input_filename, 1);
    }

  if (output_format == RES_FORMAT_UNKNOWN)
    {
      if (output_filename == NULL)
	output_format = RES_FORMAT_RC;
      else
	output_format = format_from_filename (output_filename, 0);
    }

  /* Read the input file.  */
  switch (input_format)
    {
    default:
      abort ();
    case RES_FORMAT_RC:
      resources = read_rc_file (input_filename, preprocessor, preprocargs,
				language, use_temp_file);
      break;
    case RES_FORMAT_RES:
      resources = read_res_file (input_filename);
      break;
    case RES_FORMAT_COFF:
      resources = read_coff_rsrc (input_filename, target);
      break;
    }

  if (resources == NULL)
    fatal (_("no resources"));

  /* Sort the resources.  This is required for COFF, convenient for
     rc, and unimportant for res.  */
  resources = sort_resources (resources);

  /* Write the output file.  */
  reswr_init ();

  switch (output_format)
    {
    default:
      abort ();
    case RES_FORMAT_RC:
      write_rc_file (output_filename, resources);
      break;
    case RES_FORMAT_RES:
      write_res_file (output_filename, resources);
      break;
    case RES_FORMAT_COFF:
      write_coff_file (output_filename, target, resources);
      break;
    }

  xexit (0);
  return 0;
}