/* Utility and Unix shadow routines for XEmacs on Windows NT.
   Copyright (C) 1994, 1995 Free Software Foundation, Inc.

This file is part of XEmacs.

XEmacs 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, or (at your option) any
later version.

XEmacs 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 XEmacs; see the file COPYING.  If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.


   Geoff Voelker (voelker@cs.washington.edu) 7-29-94 */

/* Adapted for XEmacs by David Hobley <david@spook-le0.cia.com.au> */
/* Sync'ed with Emacs 19.34.6 by Marc Paquette <marcpa@cam.org> */
/* Adapted to fpTeX 0.4 by Fabrice Popineau <Fabrice.Popineau@supelec.fr> */

#ifdef __MINGW32__

#include <kpathsea/config.h>
#include <kpathsea/c-proto.h>
#include <kpathsea/win32lib.h>
#include <kpathsea/lib.h>

/* Normalize filename by converting all path separators to
   the specified separator.  Also conditionally convert upper
   case path name components to lower case.
   Returns the index of the first meaningful char in the path
   past any drive specifier of unc name specifier.
   Remove any multiple path separators after a leading
   drive specifier or double path separator.
*/

int
normalize_filename (char *fp, char path_sep)
{
  char *p;
  int ret, i;

  /* Always lower-case drive letters a-z, even if the filesystem
     preserves case in filenames.
     This is so filenames can be compared by string comparison
     functions that are case-sensitive.  Even case-preserving filesystems
     do not distinguish case in drive letters.  */
  if (fp[1] == ':' && *fp >= 'A' && *fp <= 'Z') {
    *fp += 'a' - 'A';
  }

  /* Remove unneeded double slashes */
  ret = (IS_UNC_NAME(fp) ? 2 :
	 NAME_BEGINS_WITH_DEVICE(fp) ? 
	 (IS_DIR_SEP(*(fp+2)) ? 3 : 2) : IS_DIR_SEP(*fp) ? 1 : 0);
  for (i = ret, p = fp+i; 
       IS_DIR_SEP(*p); 
       i++, p++);
  if (i > ret) {
    int len = strlen(fp+i);
    /* remove unneeded slashes, for the sake of win95 */
#if 0
    fprintf(stderr, "moving %s to %s\n", fp+ret, fp+i);
#endif
    memcpy(fp+ret, fp+i, len);
    *(char *)(fp+ret+len) = '\0';
  }

  /* conditionnally rewrite to same path_sep, slash preferably */
  if (path_sep) {
    for (p = fp; *p; p++)
      if (IS_DIR_SEP(*p))
	*p = path_sep;
  }

#if 0
    fprintf(stderr, "normalize_filename returned (%d) %s\n", ret, fp);
#endif  

  return ret;
}


/* Destructively turn backslashes into slashes.  */
void
dostounix_filename (char *p)
{
  normalize_filename (p, '/');
}

/* Destructively turn slashes into backslashes.  */
void
unixtodos_filename (char *p)
{
  normalize_filename (p, '\\');
}

/* Remove all CR's that are followed by a LF.
   (From msdos.c...probably should figure out a way to share it,
   although this code isn't going to ever change.)  */
int
crlf_to_lf (int n, unsigned char *buf, unsigned *lf_count)
{
  unsigned char *np = buf;
  unsigned char *startp = buf;
  unsigned char *endp = buf + n;

  if (n == 0)
    return n;
  while (buf < endp - 1)
    {
      if (*buf == 0x0a)
	(*lf_count)++;
      if (*buf == 0x0d)
	{
	  if (*(++buf) != 0x0a)
	    *np++ = 0x0d;
	}
      else
	*np++ = *buf++;
    }
  if (buf < endp)
    {
      if (*buf == 0x0a)
	(*lf_count)++;
    *np++ = *buf++;
    }
  return np - startp;
}

/* Parse the root part of file name, if present.  Return length and
    optionally store pointer to char after root.  */
int
_parse_root (char * name, char ** pPath)
{
  char * start = name;

  if (name == NULL)
    return 0;

  /* find the root name of the volume if given */
  if (isalpha (name[0]) && name[1] == ':')
    {
      /* skip past drive specifier */
      name += 2;
      if (IS_DIR_SEP (name[0]))
	name++;
    }
  else if (IS_DIR_SEP (name[0]) && IS_DIR_SEP (name[1]))
    {
      int slashes = 2;
      name += 2;
      do
        {
	  if (IS_DIR_SEP (*name) && --slashes == 0)
	    break;
	  name++;
	}
      while ( *name );
      if (IS_DIR_SEP (name[0]))
	name++;
    }

  if (pPath)
    *pPath = name;

  return name - start;
}

/* Get long base name for name; name is assumed to be absolute.  */
static int
get_long_basename (char * name, char * buf, int size)
{
  WIN32_FIND_DATA find_data;
  HANDLE dir_handle;
  int len = 0;
#ifdef PIGSFLY
  char *p;

  /* If the last component of NAME has a wildcard character, 
     return it as the basename.  */
  p = name + strlen (name);
  while (*p != '\\' && *p != ':' && p > name) p--;
  if (p > name) p++;
  if (strchr (p, '*') || strchr (p, '?'))
    {
      if ((len = strlen (p)) < size)
	memcpy (buf, p, len + 1);
      else
	len = 0;
      return len;
    }
#endif

  dir_handle = FindFirstFile (name, &find_data);
  if (dir_handle != INVALID_HANDLE_VALUE)
    {
      if ((len = strlen (find_data.cFileName)) < size)
	memcpy (buf, find_data.cFileName, len + 1);
      else
	len = 0;
      FindClose (dir_handle);
    }
  return len;
}

/* Get long name for file, if possible (assumed to be absolute).  */
BOOL
win32_get_long_filename (char * name, char * buf, int size)
{
  char * o = buf;
  char * p;
  char * q;
  char full[ MAX_PATH ];
  int len;

  len = strlen (name);
  if (len >= MAX_PATH)
    return FALSE;

  /* Use local copy for destructive modification.  */
  memcpy (full, name, len+1);
  unixtodos_filename (full);

  /* Copy root part verbatim.  */
  len = _parse_root (full, &p);
  memcpy (o, full, len);
  o += len;
  size -= len;

  do
    {
      q = p;
      p = strchr (q, '\\');
      if (p) *p = '\0';
      len = get_long_basename (full, o, size);
      if (len > 0)
	{
	  o += len;
	  size -= len;
	  if (p != NULL)
	    {
	      *p++ = '\\';
	      if (size < 2)
		return FALSE;
	      *o++ = '\\';
	      size--;
	      *o = '\0';
	    }
	}
      else
	return FALSE;
    }
  while (p != NULL && *p);

  return TRUE;
}

/* Map filename to a legal 8.3 name if necessary. */
const char *
map_win32_filename (const char * name, const char ** pPath)
{
  static char shortname[MAX_PATH];
  char * str = shortname;
  char c;
  const char * path;
  const char * save_name = name;

  if (is_fat_volume (name, &path)) /* truncate to 8.3 */
    {
      register int left = 8;	/* maximum number of chars in part */
      register int extn = 0;	/* extension added? */
      register int dots = 2;	/* maximum number of dots allowed */

      while (name < path)
	*str++ = *name++;	/* skip past UNC header */

      while ((c = *name++))
        {
	  switch ( c )
	    {
	    case '\\':
	    case '/':
	      *str++ = '\\';
	      extn = 0;		/* reset extension flags */
	      dots = 2;		/* max 2 dots */
	      left = 8;		/* max length 8 for main part */
	      break;
	    case ':':
	      *str++ = ':';
	      extn = 0;		/* reset extension flags */
	      dots = 2;		/* max 2 dots */
	      left = 8;		/* max length 8 for main part */
	      break;
	    case '.':
	      if ( dots )
	        {
		  /* Convert path components of the form .xxx to _xxx,
		     but leave . and .. as they are.  This allows .emacs
		     to be read as _emacs, for example.  */

		  if (! *name ||
		      *name == '.' ||
		      IS_DIR_SEP (*name))
		    {
		      *str++ = '.';
		      dots--;
		    }
		  else
		    {
		      *str++ = '_';
		      left--;
		      dots = 0;
		    }
		}
	      else if ( !extn )
	        {
		  *str++ = '.';
		  extn = 1;		/* we've got an extension */
		  left = 3;		/* 3 chars in extension */
		}
	      else
	        {
		  /* any embedded dots after the first are converted to _ */
		  *str++ = '_';
		}
	      break;
	    case '~':
	    case '#':			/* don't lose these, they're important */
	      if ( ! left )
		str[-1] = c;		/* replace last character of part */
	      /* FALLTHRU */
	    default:
	      if ( left )
	        {
		  *str++ = tolower (c);	/* map to lower case (looks nicer) */
		  left--;
		  dots = 0;		/* started a path component */
		}
	      break;
	    }
	}
      *str = '\0';
    }
  else
    {
      strcpy (shortname, name);
      unixtodos_filename (shortname);
    }

  if (pPath)
    *pPath = shortname + (path - save_name);

  return shortname;
}

#endif
