The Tor Browser: security/nss/lib/dbm/src/dirent.c@b8a032363ba2 (annotated)

security/nss/lib/dbm/src/dirent.c@b8a032363ba2 (annotated)

security/nss/lib/dbm/src/dirent.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 #ifdef OS2
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 #include <dirent.h>
 #include <errno.h>
 /*#ifndef __EMX__
 #include <libx.h>
 #endif */
 #define INCL_DOSFILEMGR
 #define INCL_DOSERRORS
 #include <os2.h>
 #if OS2 >= 2
 # define FFBUF	FILEFINDBUF3
 # define Word	ULONG
   /*
    * LS20 recommends a request count of 100, but according to the
    * APAR text it does not lead to missing files, just to funny
    * numbers of returned entries.
    *
    * LS30 HPFS386 requires a count greater than 2, or some files
    * are missing (those starting with a character less that '.').
    *
    * Novell loses entries which overflow the buffer. In previous
    * versions of dirent2, this could have lead to missing files
    * when the average length of 100 directory entries was 40 bytes
    * or more (quite unlikely for files on a Novell server).
    *
    * Conclusion: Make sure that the entries all fit into the buffer
    * and that the buffer is large enough for more than 2 entries
    * (each entry is at most 300 bytes long). And ignore the LS20
    * effect.
    */
 # define Count	25
 # define BufSz	(25 * (sizeof(FILEFINDBUF3)+1))
 #else
 # define FFBUF	FILEFINDBUF
 # define Word	USHORT
 # define BufSz	1024
 # define Count	3
 #endif
 #if defined(__IBMC__) || defined(__IBMCPP__)
   #define error(rc) _doserrno = rc, errno = EOS2ERR
 #elif defined(MICROSOFT)
   #define error(rc) _doserrno = rc, errno = 255
 #else
   #define error(rc) errno = 255
 #endif
 struct _dirdescr {
 	HDIR		handle;		/* DosFindFirst handle */
 	char		fstype;		/* filesystem type */
 	Word		count;		/* valid entries in <ffbuf> */
 	long		number;		/* absolute number of next entry */
 	int		index;		/* relative number of next entry */
 	FFBUF *		next;		/* pointer to next entry */
 	char		name[MAXPATHLEN+3]; /* directory name */
 	unsigned	attrmask;	/* attribute mask for seekdir */
 	struct dirent	entry;		/* buffer for directory entry */
 	BYTE		ffbuf[BufSz];
 };
 /*
  * Return first char of filesystem type, or 0 if unknown.
  */
 static char
 getFSType(const char *path)
 {
 	static char cache[1+26];
 	char drive[3], info[512];
 	Word unit, infolen;
 	char r;
 	if (isalpha(path[0]) && path[1] == ':') {
 		unit = toupper(path[0]) - '@';
 		path += 2;
 	} else {
 		ULONG driveMap;
 #if OS2 >= 2
 		if (DosQueryCurrentDisk(&unit, &driveMap))
 #else
 		if (DosQCurDisk(&unit, &driveMap))
 #endif
 			return 0;
 	}
 	if ((path[0] == '\\' || path[0] == '/')
 	 && (path[1] == '\\' || path[1] == '/'))
 		return 0;
 	if (cache [unit])
 		return cache [unit];
 	drive[0] = '@' + unit;
 	drive[1] = ':';
 	drive[2] = '\0';
 	infolen = sizeof info;
 #if OS2 >= 2
 	if (DosQueryFSAttach(drive, 0, FSAIL_QUERYNAME, (PVOID)info, &infolen))
 		return 0;
 	if (infolen >= sizeof(FSQBUFFER2)) {
 		FSQBUFFER2 *p = (FSQBUFFER2 *)info;
 		r = p->szFSDName[p->cbName];
 	} else
 #else
 	if (DosQFSAttach((PSZ)drive, 0, FSAIL_QUERYNAME, (PVOID)info, &infolen, 0))
 		return 0;
 	if (infolen >= 9) {
 		char *p = info + sizeof(USHORT);
 		p += sizeof(USHORT) + *(USHORT *)p + 1 + sizeof(USHORT);
 		r = *p;
 	} else
 #endif
 		r = 0;
 	return cache [unit] = r;
 }
 char *
 abs_path(const char *name, char *buffer, int len)
 {
 	char buf[4];
 	if (isalpha(name[0]) && name[1] == ':' && name[2] == '\0') {
 		buf[0] = name[0];
 		buf[1] = name[1];
 		buf[2] = '.';
 		buf[3] = '\0';
 		name = buf;
 	}
 #if OS2 >= 2
 	if (DosQueryPathInfo((PSZ)name, FIL_QUERYFULLNAME, buffer, len))
 #else
 	if (DosQPathInfo((PSZ)name, FIL_QUERYFULLNAME, (PBYTE)buffer, len, 0L))
 #endif
 		return NULL;
 	return buffer;
 }
 DIR *
 openxdir(const char *path, unsigned att_mask)
 {
 	DIR *dir;
 	char name[MAXPATHLEN+3];
 	Word rc;
 	dir = malloc(sizeof(DIR));
 	if (dir == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
 	strncpy(name, path, MAXPATHLEN);
 	name[MAXPATHLEN] = '\0';
 	switch (name[strlen(name)-1]) {
 	default:
 		strcat(name, "\\");
 	case '\\':
 	case '/':
 	case ':':
 		;
 	}
 	strcat(name, ".");
 	if (!abs_path(name, dir->name, MAXPATHLEN+1))
 		strcpy(dir->name, name);
 	if (dir->name[strlen(dir->name)-1] == '\\')
 		strcat(dir->name, "*");
 	else
 		strcat(dir->name, "\\*");
 	dir->fstype = getFSType(dir->name);
 	dir->attrmask = att_mask | A_DIR;
 	dir->handle = HDIR_CREATE;
 	dir->count = 100;
 #if OS2 >= 2
 	rc = DosFindFirst(dir->name, &dir->handle, dir->attrmask,
 		dir->ffbuf, sizeof dir->ffbuf, &dir->count, FIL_STANDARD);
 #else
 	rc = DosFindFirst((PSZ)dir->name, &dir->handle, dir->attrmask,
 		(PFILEFINDBUF)dir->ffbuf, sizeof dir->ffbuf, &dir->count, 0);
 #endif
 	switch (rc) {
 	default:
 		free(dir);
 		error(rc);
 		return NULL;
 	case NO_ERROR:
 	case ERROR_NO_MORE_FILES:
 		;
 	}
 	dir->number = 0;
 	dir->index = 0;
 	dir->next = (FFBUF *)dir->ffbuf;
 	return (DIR *)dir;
 }
 DIR *
 opendir(const char *pathname)
 {
 	return openxdir(pathname, 0);
 }
 struct dirent *
 readdir(DIR *dir)
 {
 	static int dummy_ino = 2;
 	if (dir->index == dir->count) {
 		Word rc;
 		dir->count = 100;
 #if OS2 >= 2
 		rc = DosFindNext(dir->handle, dir->ffbuf,
 			sizeof dir->ffbuf, &dir->count);
 #else
 		rc = DosFindNext(dir->handle, (PFILEFINDBUF)dir->ffbuf,
 			sizeof dir->ffbuf, &dir->count);
 #endif
 		if (rc) {
 			error(rc);
 			return NULL;
 		}
 		dir->index = 0;
 		dir->next = (FFBUF *)dir->ffbuf;
 	}
 	if (dir->index == dir->count)
 		return NULL;
 	memcpy(dir->entry.d_name, dir->next->achName, dir->next->cchName);
 	dir->entry.d_name[dir->next->cchName] = '\0';
 	dir->entry.d_ino = dummy_ino++;
 	dir->entry.d_reclen = dir->next->cchName;
 	dir->entry.d_namlen = dir->next->cchName;
 	dir->entry.d_size = dir->next->cbFile;
 	dir->entry.d_attribute = dir->next->attrFile;
 	dir->entry.d_time = *(USHORT *)&dir->next->ftimeLastWrite;
 	dir->entry.d_date = *(USHORT *)&dir->next->fdateLastWrite;
 	switch (dir->fstype) {
 	case 'F': /* FAT */
 	case 'C': /* CDFS */
 		if (dir->next->attrFile & FILE_DIRECTORY)
 			strupr(dir->entry.d_name);
 		else
 			strlwr(dir->entry.d_name);
 	}
 #if OS2 >= 2
 	dir->next = (FFBUF *)((BYTE *)dir->next + dir->next->oNextEntryOffset);
 #else
 	dir->next = (FFBUF *)((BYTE *)dir->next->achName + dir->next->cchName + 1);
 #endif
 	++dir->number;
 	++dir->index;
 	return &dir->entry;
 }
 long
 telldir(DIR *dir)
 {
 	return dir->number;
 }
 void
 seekdir(DIR *dir, long off)
 {
 	if (dir->number > off) {
 		char name[MAXPATHLEN+2];
 		Word rc;
 		DosFindClose(dir->handle);
 		strcpy(name, dir->name);
 		strcat(name, "*");
 		dir->handle = HDIR_CREATE;
 		dir->count = 32767;
 #if OS2 >= 2
 		rc = DosFindFirst(name, &dir->handle, dir->attrmask,
 			dir->ffbuf, sizeof dir->ffbuf, &dir->count, FIL_STANDARD);
 #else
 		rc = DosFindFirst((PSZ)name, &dir->handle, dir->attrmask,
 			(PFILEFINDBUF)dir->ffbuf, sizeof dir->ffbuf, &dir->count, 0);
 #endif
 		switch (rc) {
 		default:
 			error(rc);
 			return;
 		case NO_ERROR:
 		case ERROR_NO_MORE_FILES:
 			;
 		}
 		dir->number = 0;
 		dir->index = 0;
 		dir->next = (FFBUF *)dir->ffbuf;
 	}
 	while (dir->number < off && readdir(dir))
 		;
 }
 void
 closedir(DIR *dir)
 {
 	DosFindClose(dir->handle);
 	free(dir);
 }
 /*****************************************************************************/
 #ifdef TEST
 main(int argc, char **argv)
 {
 	int i;
 	DIR *dir;
 	struct dirent *ep;
 	for (i = 1; i < argc; ++i) {
 		dir = opendir(argv[i]);
 		if (!dir)
 			continue;
 		while (ep = readdir(dir))
 			if (strchr("\\/:", argv[i] [strlen(argv[i]) - 1]))
 				printf("%s%s\n", argv[i], ep->d_name);
 			else
 				printf("%s/%s\n", argv[i], ep->d_name);
 		closedir(dir);
 	}
 	return 0;
 }
 #endif
 #endif /* OS2 */

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security/nss/lib/dbm/src/dirent.c@b8a032363ba2 (annotated)

security/nss/lib/dbm/src/dirent.c