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dirent.c
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C/C++ Source or Header
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1995-04-29
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9KB
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390 lines
/*****************************************************************************
* $Id: dirent2.c,v 1.10 1995/04/28 22:40:36 ak Exp $
*****************************************************************************
* $Log: dirent2.c,v $
* Revision 1.10 1995/04/28 22:40:36 ak
* Cleanup. Make dirent2 layout compatible to EMX to avoid trouble
* with include-files. Moved struct defs to implementation.
*
* Revision 1.9 1994/11/18 22:39:48 ak
* Use a request count of 100 to avoid LS20 bug.
*
* Revision 1.8 1994/02/17 11:57:06 ak
* Bugfix upper/lowercase conversion.
*
* Revision 1.7 1994/02/14 14:07:26 edvkai
* Added abs_path (like dirent.c), it's needed in some places.
*
* Revision 1.6 1994/02/08 14:59:51 edvkai
* fstype caching.
* different buffer sizes.
* no double slashes
*
* Revision 1.5 1994/01/05 13:46:36 edvkai
* Old openxdir included directories by default, so dirent2 should do as well.
*
* Revision 1.4 1994/01/03 12:30:46 edvkai
* *** empty log message ***
*
* Revision 1.3 1994/01/03 12:30:21 edvkai
* *** empty log message ***
*
* Revision 1.2 1993/12/30 18:11:37 edvkai
* opendir omitted directories.
*
* Revision 1.1 1993/12/30 17:58:15 edvkai
* Initial revision
*
*****************************************************************************/
#ifdef OS2
static char *rcsid = "$Id: dirent2.c,v 1.10 1995/04/28 22:40:36 ak Exp $";
#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 looses 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__)
#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(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 */