/*
 * Copyright (c) 2004, Richard Levitte <richard@levitte.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include <windows.h>
#include <tchar.h>
#ifndef LPDIR_H
#include "LPdir.h"
#endif

/* We're most likely overcautious here, but let's reserve for
    broken WinCE headers and explicitly opt for UNICODE call.
    Keep in mind that our WinCE builds are compiled with -DUNICODE
    [as well as -D_UNICODE]. */
#if defined(LP_SYS_WINCE) && !defined(FindFirstFile)
# define FindFirstFile FindFirstFileW
#endif
#if defined(LP_SYS_WINCE) && !defined(FindNextFile)
# define FindNextFile FindNextFileW
#endif

#ifndef NAME_MAX
#define NAME_MAX 255
#endif

struct LP_dir_context_st
{
  WIN32_FIND_DATA ctx;
  HANDLE handle;
  char entry_name[NAME_MAX+1];
};

const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
{
  if (ctx == NULL || directory == NULL)
    {
      errno = EINVAL;
      return 0;
    }

  errno = 0;
  if (*ctx == NULL)
    {
      const char *extdir = directory;
      char *extdirbuf = NULL;
      size_t dirlen = strlen (directory);

      if (dirlen == 0)
	{
	  errno = ENOENT;
	  return 0;
	}

      *ctx = (LP_DIR_CTX *)malloc(sizeof(LP_DIR_CTX));
      if (*ctx == NULL)
	{
	  errno = ENOMEM;
	  return 0;
	}
      memset(*ctx, '\0', sizeof(LP_DIR_CTX));

      if (directory[dirlen-1] != '*')
	{
	  extdirbuf = (char *)malloc(dirlen + 3);
	  if (extdirbuf == NULL)
	    {
	      free(*ctx);
	      *ctx = NULL;
	      errno = ENOMEM;
	      return 0;
	    }
	  if (directory[dirlen-1] != '/' && directory[dirlen-1] != '\\')
	    extdir = strcat(strcpy (extdirbuf,directory),"/*");
	  else
	    extdir = strcat(strcpy (extdirbuf,directory),"*");
	}

      if (sizeof(TCHAR) != sizeof(char))
	{
	  TCHAR *wdir = NULL;
	  /* len_0 denotes string length *with* trailing 0 */ 
	  size_t index = 0,len_0 = strlen(extdir) + 1;

	  wdir = (TCHAR *)calloc(len_0, sizeof(TCHAR));
	  if (wdir == NULL)
	    {
	      if (extdirbuf != NULL)
		{
		  free (extdirbuf);
		}
	      free(*ctx);
	      *ctx = NULL;
	      errno = ENOMEM;
	      return 0;
	    }

#ifdef LP_MULTIBYTE_AVAILABLE
	  if (!MultiByteToWideChar(CP_ACP, 0, extdir, len_0, (WCHAR *)wdir, len_0))
#endif
	    for (index = 0; index < len_0; index++)
	      wdir[index] = (TCHAR)extdir[index];

	  (*ctx)->handle = FindFirstFile(wdir, &(*ctx)->ctx);

	  free(wdir);
	}
      else
	{
	  (*ctx)->handle = FindFirstFile((TCHAR *)extdir, &(*ctx)->ctx);
	}
      if (extdirbuf != NULL)
	{
	  free (extdirbuf);
	}

      if ((*ctx)->handle == INVALID_HANDLE_VALUE)
	{
	  free(*ctx);
	  *ctx = NULL;
	  errno = EINVAL;
	  return 0;
	}
    }
  else
    {
      if (FindNextFile((*ctx)->handle, &(*ctx)->ctx) == FALSE)
	{
	  return 0;
	}
    }
  if (sizeof(TCHAR) != sizeof(char))
    {
      TCHAR *wdir = (*ctx)->ctx.cFileName;
      size_t index, len_0 = 0;

      while (wdir[len_0] && len_0 < (sizeof((*ctx)->entry_name) - 1)) len_0++;
      len_0++;

#ifdef LP_MULTIBYTE_AVAILABLE
      if (!WideCharToMultiByte(CP_ACP, 0, (WCHAR *)wdir, len_0, (*ctx)->entry_name,
			       sizeof((*ctx)->entry_name), NULL, 0))
#endif
	for (index = 0; index < len_0; index++)
	  (*ctx)->entry_name[index] = (char)wdir[index];
    }
  else
    strncpy((*ctx)->entry_name, (const char *)(*ctx)->ctx.cFileName,
	    sizeof((*ctx)->entry_name)-1);

  (*ctx)->entry_name[sizeof((*ctx)->entry_name)-1] = '\0';

  return (*ctx)->entry_name;
}

int LP_find_file_end(LP_DIR_CTX **ctx)
{
  if (ctx != NULL && *ctx != NULL)
    {
      FindClose((*ctx)->handle);
      free(*ctx);
      *ctx = NULL;
      return 1;
    }
  errno = EINVAL;
  return 0;
}