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Cygwin: reduce size of fhandler_cygdrive 

fhandler_cygdrive has a size of 696 bytes on x86_64, while the next
biggest fhandler type, fhandler_pty_master, is 584 bytes.  The members
responsible for the size are private to opendir/readdir/closedir usage.
fhandler_disk_file stores private readdir data in DIR->__d_internal
instead.  Use equivalent method with fhandler_cygdrive.  This drops
the size to 464 bytes.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2018-02-26 20:39:48 +01:00
parent b995936ab5
commit fbdae2c216
2 changed files with 26 additions and 27 deletions
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8
winsup/cygwin/fhandler.h
View File

@ -1350,14 +1350,6 @@ public:
class fhandler_cygdrive: public fhandler_disk_file
{
enum
{
DRVSZ = sizeof ("x:\\")
};
int ndrives;
const char *pdrive;
char pdrive_buf[1 + (2 * 26 * DRVSZ)];
void set_drives ();
public:
fhandler_cygdrive ();
int open (int flags, mode_t mode);

45
winsup/cygwin/fhandler_disk_file.cc
View File

@ -2362,7 +2362,7 @@ fhandler_disk_file::closedir (DIR *dir)
}
fhandler_cygdrive::fhandler_cygdrive () :
fhandler_disk_file (), ndrives (0), pdrive (NULL)
fhandler_disk_file ()
{
}
@ -2383,13 +2383,6 @@ fhandler_cygdrive::open (int flags, mode_t mode)
return open_null (flags);
}
void
fhandler_cygdrive::set_drives ()
{
pdrive = pdrive_buf;
ndrives = GetLogicalDriveStrings (sizeof pdrive_buf, pdrive_buf) / DRVSZ;
}
int
fhandler_cygdrive::fstat (struct stat *buf)
{
@ -2412,14 +2405,28 @@ fhandler_cygdrive::fstatvfs (struct statvfs *sfs)
return 0;
}
#define MAX_DRIVE_BUF_LEN (sizeof ("x:\\") * 26 + 2)
struct __DIR_drives
{
char *pdrive;
char pbuf[MAX_DRIVE_BUF_LEN];
};
#define d_drives(d) ((__DIR_drives *) (d)->__d_internal)
DIR *
fhandler_cygdrive::opendir (int fd)
{
DIR *dir;
dir = fhandler_disk_file::opendir (fd);
if (dir && !ndrives)
set_drives ();
if (dir)
{
dir->__d_internal = (uintptr_t) new __DIR_drives;
GetLogicalDriveStrings (MAX_DRIVE_BUF_LEN, d_drives(dir)->pbuf);
d_drives(dir)->pdrive = d_drives(dir)->pbuf;
}
return dir;
}
@ -2431,7 +2438,7 @@ fhandler_cygdrive::readdir (DIR *dir, dirent *de)
while (true)
{
if (!pdrive || !*pdrive)
if (!d_drives(dir)->pdrive || !*d_drives(dir)->pdrive)
{
if (!(dir->__flags & dirent_saw_dot))
{
@ -2441,7 +2448,7 @@ fhandler_cygdrive::readdir (DIR *dir, dirent *de)
}
return ENMFILE;
}
disk_type dt = get_disk_type ((drive[0] = *pdrive, drive));
disk_type dt = get_disk_type ((drive[0] = *d_drives(dir)->pdrive, drive));
if (dt == DT_SHARE_SMB)
{
/* Calling NetUseGetInfo on SMB drives allows to fetch the
@ -2463,16 +2470,16 @@ fhandler_cygdrive::readdir (DIR *dir, dirent *de)
}
}
else if (dt != DT_FLOPPY
&& GetFileAttributes (pdrive) != INVALID_FILE_ATTRIBUTES)
&& GetFileAttributes (d_drives(dir)->pdrive) != INVALID_FILE_ATTRIBUTES)
break;
pdrive = strchr (pdrive, '\0') + 1;
d_drives(dir)->pdrive = strchr (d_drives(dir)->pdrive, '\0') + 1;
}
*de->d_name = cyg_tolower (*pdrive);
*de->d_name = cyg_tolower (*d_drives(dir)->pdrive);
de->d_name[1] = '\0';
user_shared->warned_msdos = true;
de->d_ino = readdir_get_ino (pdrive, false);
de->d_ino = readdir_get_ino (d_drives(dir)->pdrive, false);
dir->__d_position++;
pdrive = strchr (pdrive, '\0') + 1;
d_drives(dir)->pdrive = strchr (d_drives(dir)->pdrive, '\0') + 1;
syscall_printf ("%p = readdir (%p) (%s)", &de, dir, de->d_name);
return 0;
}
@ -2480,13 +2487,13 @@ fhandler_cygdrive::readdir (DIR *dir, dirent *de)
void
fhandler_cygdrive::rewinddir (DIR *dir)
{
pdrive = pdrive_buf;
d_drives(dir)->pdrive = d_drives(dir)->pbuf;
dir->__d_position = 0;
}
int
fhandler_cygdrive::closedir (DIR *dir)
{
pdrive = pdrive_buf;
delete d_drives(dir);
return 0;
}