postgresql/src/port/dirent.c

/*-------------------------------------------------------------------------
 *
 * dirent.c
 *	  opendir/readdir/closedir for win32/msvc
 *
 * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  $PostgreSQL: pgsql/src/port/dirent.c,v 1.2 2006/06/26 12:58:17 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"
#include <dirent.h>


struct DIR {
	char *dirname;
	struct dirent ret; /* Used to return to caller */
	HANDLE handle;
};

DIR* opendir(const char *dirname)
{
	DWORD attr;
	DIR *d;

	/* Make sure it is a directory */
	attr = GetFileAttributes(dirname);
	if (attr == INVALID_FILE_ATTRIBUTES) 
	{
		errno = ENOENT;
		return NULL;
	}
	if ((attr & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY)
	{
		errno = ENOTDIR;
		return NULL;
	}

	d = malloc(sizeof(DIR));
	if (!d)
	{
		errno = ENOMEM;
		return NULL;
	}
	d->dirname = malloc(strlen(dirname)+4);
	if (!d->dirname)
	{
		errno = ENOMEM;
		free(d);
		return NULL;
	}
	strcpy(d->dirname, dirname);
	if (d->dirname[strlen(d->dirname)-1] != '/' &&
	    d->dirname[strlen(d->dirname)-1] != '\\')
		strcat(d->dirname,"\\"); /* Append backslash if not already there */
	strcat(d->dirname,"*");          /* Search for entries named anything */
	d->handle = INVALID_HANDLE_VALUE;
	d->ret.d_ino = 0; /* no inodes on win32 */
	d->ret.d_reclen =  0; /* not used on win32 */

	return d;
}

struct dirent* readdir(DIR * d)
{
	WIN32_FIND_DATA fd;

	if (d->handle == INVALID_HANDLE_VALUE)
	{
		d->handle = FindFirstFile(d->dirname, &fd);
		if (d->handle == INVALID_HANDLE_VALUE)
		{
			errno = ENOENT;
			return NULL;
		}
	}
	else 
	{
		if (!FindNextFile(d->handle, &fd))
		{
			if (GetLastError() == ERROR_NO_MORE_FILES)
			{
				/* No more files, force errno=0 (unlike mingw) */
				errno = 0;
				return NULL;
			}
			_dosmaperr(GetLastError());
			return NULL;
		}
	}
	strcpy(d->ret.d_name, fd.cFileName); /* Both strings are MAX_PATH long */
	d->ret.d_namlen = strlen(d->ret.d_name);
	return &d->ret;
}

int closedir(DIR *d)
{
	if (d->handle != INVALID_HANDLE_VALUE)
		FindClose(d->handle);
	free(d->dirname);
	free(d);
	return 0;
}