File: dirent.c

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/*
 * $LynxId: dirent.c,v 1.3 2009/03/11 00:31:33 tom Exp $
 *
 * dir.c for MS-DOS by Samuel Lam <skl@van-bc.UUCP>, June/87 
 */

/* #ifdef WIN32 */
/* 
 * @(#)dir.c 1.4 87/11/06 Public Domain. 
 * 
 *  A public domain implementation of BSD directory routines for 
 *  MS-DOS.  Written by Michael Rendell ({uunet,utai}michael@garfield), 
 *  August 1897 
 *  Ported to OS/2 by Kai Uwe Rommel 
 *  December 1989, February 1990 
 *  Ported to Windows NT 22 May 91 
 *    other mods Summer '92 brianmo@microsoft.com 
 *  opendirx() was horribly written, very inefficient, and did not take care
 *    of all cases.  It is still not too clean, but it is far more efficient.
 *    Changes made by Gordon Chaffee (chaffee@bugs-bunny.cs.berkeley.edu)
 */


/*Includes: 
 *    crt 
 */
#ifdef HAVE_CONFIG_H
#include "lynx_cfg.h"
#endif

#include <windows.h>
#include <stdlib.h>
#include <string.h>
#include <sys\types.h>
#include <sys\stat.h>

#include "dirent.h"

#define stat _stat

/* 
 *    NT specific 
 */
#include <stdio.h>

/* 
 *    random typedefs 
 */
#define HDIR        HANDLE
#define HFILE       HANDLE
#define PHFILE      PHANDLE

#ifndef INVALID_HANDLE_VALUE
#define INVALID_HANDLE_VALUE ((HDIR) 0xffffffff)
#endif

/* 
 *    local functions 
 */
static char *getdirent(char *);
static void free_dircontents(struct _dircontents *);

static HDIR FindHandle;
static WIN32_FIND_DATA FileFindData;

static struct dirent dp;

DIR *opendirx(char *name, char *pattern)
{
    struct stat statb;
    DIR *dirp;
    char c;
    char *s;
    struct _dircontents *dp;
    int len;
    int unc;
    char path[OFS_MAXPATHNAME];
    register char *ip, *op;

    for (ip = name, op = path;; op++, ip++) {
	*op = *ip;
	if (*ip == '\0') {
	    break;
	}
    }
    len = ip - name;
    if (len > 0) {
	unc = ((path[0] == '\\' || path[0] == '/') &&
	       (path[1] == '\\' || path[1] == '/'));
	c = path[len - 1];
	if (unc) {
	    if (c != '\\' && c != '/') {
		path[len] = '/';
		len++;
		path[len] = '\0';
	    }
	} else {
	    if ((c == '\\' || c == '/') && (len > 1)) {
		len--;
		path[len] = '\0';

		if (path[len - 1] == ':') {
		    path[len] = '/';
		    len++;
		    path[len] = '.';
		    len++;
		    path[len] = '\0';
		}
	    } else if (c == ':') {
		path[len] = '.';
		len++;
		path[len] = '\0';
	    }
	}
    } else {
	unc = 0;
	path[0] = '.';
	path[1] = '\0';
	len = 1;
    }

    if (stat(path, &statb) < 0 || (statb.st_mode & S_IFMT) != S_IFDIR) {
	return NULL;
    }
    dirp = malloc(sizeof(DIR));
    if (dirp == NULL) {
	return dirp;
    }
    c = path[len - 1];
    if (c == '.') {
	if (len == 1) {
	    len--;
	} else {
	    c = path[len - 2];
	    if (c == '\\' || c == ':') {
		len--;
	    } else {
		path[len] = '/';
		len++;
	    }
	}
    } else if (!unc && ((len != 1) || (c != '\\' && c != '/'))) {
	path[len] = '/';
	len++;
    }
    strcpy(path + len, pattern);

    dirp->dd_loc = 0;
    dirp->dd_contents = dirp->dd_cp = NULL;

    if ((s = getdirent(path)) == NULL) {
	return dirp;
    }
    do {
	if (((dp = malloc(sizeof(struct _dircontents))) == NULL) ||
	     ((dp->_d_entry = malloc(strlen(s) + 1)) == NULL)) {
	    if (dp)
		free(dp);
	    free_dircontents(dirp->dd_contents);

	    return NULL;
	}
	if (dirp->dd_contents)
	    dirp->dd_cp = dirp->dd_cp->_d_next = dp;
	else
	    dirp->dd_contents = dirp->dd_cp = dp;

	strcpy(dp->_d_entry, s);
	dp->_d_next = NULL;

    }
    while ((s = getdirent(NULL)) != NULL);

    dirp->dd_cp = dirp->dd_contents;
    return dirp;
}

DIR *opendir(char *name)
{
    return opendirx(name, "*");
}

void closedir(DIR * dirp)
{
    free_dircontents(dirp->dd_contents);
    free(dirp);
}

struct dirent *readdir(DIR * dirp)
{
    /* static struct dirent dp; */
    if (dirp->dd_cp == NULL)
	return NULL;

    /*strcpy(dp.d_name,dirp->dd_cp->_d_entry); */

    dp.d_name = dirp->dd_cp->_d_entry;

    dp.d_namlen = dp.d_reclen =
	strlen(dp.d_name);

    dp.d_ino = (ino_t) (dirp->dd_loc + 1);	/* fake the inode */

    dirp->dd_cp = dirp->dd_cp->_d_next;
    dirp->dd_loc++;


    return &dp;
}

void seekdir(DIR * dirp, long off)
{
    long i = off;
    struct _dircontents *dp;

    if (off >= 0) {
	for (dp = dirp->dd_contents; --i >= 0 && dp; dp = dp->_d_next);

	dirp->dd_loc = off - (i + 1);
	dirp->dd_cp = dp;
    }
}


long telldir(DIR * dirp)
{
    return dirp->dd_loc;
}

static void free_dircontents(struct _dircontents *dp)
{
    struct _dircontents *odp;

    while (dp) {
	if (dp->_d_entry)
	    free(dp->_d_entry);

	dp = (odp = dp)->_d_next;
	free(odp);
    }
}
/* end of "free_dircontents" */

static char *getdirent(char *dir)
{
    int got_dirent;

    if (dir != NULL) {		/* get first entry */
	if ((FindHandle = FindFirstFile(dir, &FileFindData))
	    == INVALID_HANDLE_VALUE) {
	    return NULL;
	}
	got_dirent = 1;
    } else			/* get next entry */
	got_dirent = FindNextFile(FindHandle, &FileFindData);

    if (got_dirent)
	return FileFindData.cFileName;
    else {
	FindClose(FindHandle);
	return NULL;
    }
}
/* end of getdirent() */

struct passwd *_cdecl
 getpwnam(char *name)
{
    return NULL;
}

struct passwd *_cdecl
 getpwuid(int uid)
{
    return NULL;
}

int getuid()
{
    return 0;
}

void _cdecl
 endpwent(void)
{
}

/* #endif */