fontconfig/src/fcstat.c

443 lines
10 KiB
C

/*
* Copyright © 2000 Keith Packard
* Copyright © 2005 Patrick Lam
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the author(s) not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. The authors make no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "fcint.h"
#include "fcarch.h"
#include <dirent.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_SYS_VFS_H
#include <sys/vfs.h>
#endif
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#ifdef HAVE_SYS_STATFS_H
#include <sys/statfs.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_MOUNT_H
#include <sys/mount.h>
#endif
#include <errno.h>
#ifdef _WIN32
#ifdef __GNUC__
typedef long long INT64;
#define EPOCH_OFFSET 11644473600ll
#else
#define EPOCH_OFFSET 11644473600i64
typedef __int64 INT64;
#endif
/* Workaround for problems in the stat() in the Microsoft C library:
*
* 1) stat() uses FindFirstFile() to get the file
* attributes. Unfortunately this API doesn't return correct values
* for modification time of a directory until some time after a file
* or subdirectory has been added to the directory. (This causes
* run-test.sh to fail, for instance.) GetFileAttributesEx() is
* better, it returns the updated timestamp right away.
*
* 2) stat() does some strange things related to backward
* compatibility with the local time timestamps on FAT volumes and
* daylight saving time. This causes problems after the switches
* to/from daylight saving time. See
* http://bugzilla.gnome.org/show_bug.cgi?id=154968 , especially
* comment #30, and http://www.codeproject.com/datetime/dstbugs.asp .
* We don't need any of that, FAT and Win9x are as good as dead. So
* just use the UTC timestamps from NTFS, converted to the Unix epoch.
*/
int
FcStat (const FcChar8 *file, struct stat *statb)
{
WIN32_FILE_ATTRIBUTE_DATA wfad;
char full_path_name[MAX_PATH];
char *basename;
DWORD rc;
if (!GetFileAttributesEx ((LPCSTR) file, GetFileExInfoStandard, &wfad))
return -1;
statb->st_dev = 0;
/* Calculate a pseudo inode number as a hash of the full path name.
* Call GetLongPathName() to get the spelling of the path name as it
* is on disk.
*/
rc = GetFullPathName ((LPCSTR) file, sizeof (full_path_name), full_path_name, &basename);
if (rc == 0 || rc > sizeof (full_path_name))
return -1;
rc = GetLongPathName (full_path_name, full_path_name, sizeof (full_path_name));
statb->st_ino = FcStringHash ((const FcChar8 *) full_path_name);
statb->st_mode = _S_IREAD | _S_IWRITE;
statb->st_mode |= (statb->st_mode >> 3) | (statb->st_mode >> 6);
if (wfad.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
statb->st_mode |= _S_IFDIR;
else
statb->st_mode |= _S_IFREG;
statb->st_nlink = 1;
statb->st_uid = statb->st_gid = 0;
statb->st_rdev = 0;
if (wfad.nFileSizeHigh > 0)
return -1;
statb->st_size = wfad.nFileSizeLow;
statb->st_atime = (*(INT64 *)&wfad.ftLastAccessTime)/10000000 - EPOCH_OFFSET;
statb->st_mtime = (*(INT64 *)&wfad.ftLastWriteTime)/10000000 - EPOCH_OFFSET;
statb->st_ctime = statb->st_mtime;
return 0;
}
#else
int
FcStat (const FcChar8 *file, struct stat *statb)
{
return stat ((char *) file, statb);
}
/* Adler-32 checksum implementation */
struct Adler32 {
int a;
int b;
};
static void
Adler32Init (struct Adler32 *ctx)
{
ctx->a = 1;
ctx->b = 0;
}
static void
Adler32Update (struct Adler32 *ctx, const char *data, int data_len)
{
while (data_len--)
{
ctx->a = (ctx->a + *data++) % 65521;
ctx->b = (ctx->b + ctx->a) % 65521;
}
}
static int
Adler32Finish (struct Adler32 *ctx)
{
return ctx->a + (ctx->b << 16);
}
#ifdef HAVE_STRUCT_DIRENT_D_TYPE
/* dirent.d_type can be relied upon on FAT filesystem */
static FcBool
FcDirChecksumScandirFilter(const struct dirent *entry)
{
return entry->d_type != DT_DIR;
}
#endif
static int
FcDirChecksumScandirSorter(const struct dirent **lhs, const struct dirent **rhs)
{
return strcmp((*lhs)->d_name, (*rhs)->d_name);
}
static void
free_dirent (struct dirent **p)
{
struct dirent **x;
for (x = p; *x != NULL; x++)
free (*x);
free (p);
}
int
FcScandir (const char *dirp,
struct dirent ***namelist,
int (*filter) (const struct dirent *),
int (*compar) (const struct dirent **, const struct dirent **));
int
FcScandir (const char *dirp,
struct dirent ***namelist,
int (*filter) (const struct dirent *),
int (*compar) (const struct dirent **, const struct dirent **))
{
DIR *d;
struct dirent *dent, *p, **dlist, **dlp;
size_t lsize = 128, n = 0;
d = opendir (dirp);
if (!d)
return -1;
dlist = (struct dirent **) malloc (sizeof (struct dirent *) * lsize);
if (!dlist)
{
closedir (d);
errno = ENOMEM;
return -1;
}
*dlist = NULL;
while ((dent = readdir (d)))
{
if (!filter || (filter) (dent))
{
size_t dentlen = FcPtrToOffset (dent, dent->d_name) + strlen (dent->d_name) + 1;
dentlen = ((dentlen + ALIGNOF_VOID_P - 1) & ~(ALIGNOF_VOID_P - 1));
p = (struct dirent *) malloc (dentlen);
memcpy (p, dent, dentlen);
if ((n + 1) >= lsize)
{
lsize += 128;
dlp = (struct dirent **) realloc (dlist, sizeof (struct dirent *) * lsize);
if (!dlp)
{
free_dirent (dlist);
closedir (d);
errno = ENOMEM;
return -1;
}
dlist = dlp;
}
dlist[n++] = p;
dlist[n] = NULL;
}
}
closedir (d);
qsort (dlist, n, sizeof (struct dirent *), (int (*) (const void *, const void *))compar);
*namelist = dlist;
return n;
}
static int
FcDirChecksum (const FcChar8 *dir, time_t *checksum)
{
struct Adler32 ctx;
struct dirent **files;
int n;
int ret = 0;
size_t len = strlen ((const char *)dir);
Adler32Init (&ctx);
n = FcScandir ((const char *)dir, &files,
#ifdef HAVE_STRUCT_DIRENT_D_TYPE
&FcDirChecksumScandirFilter,
#else
NULL,
#endif
&FcDirChecksumScandirSorter);
if (n == -1)
return -1;
while (n--)
{
size_t dlen = strlen (files[n]->d_name);
int dtype;
#ifdef HAVE_STRUCT_DIRENT_D_TYPE
dtype = files[n]->d_type;
if (dtype == DT_UNKNOWN)
{
#endif
struct stat statb;
char *f = malloc (len + 1 + dlen + 1);
if (!f)
{
ret = -1;
goto bail;
}
memcpy (f, dir, len);
f[len] = FC_DIR_SEPARATOR;
memcpy (&f[len + 1], files[n]->d_name, dlen);
f[len + 1 + dlen] = 0;
if (lstat (f, &statb) < 0)
{
ret = -1;
free (f);
goto bail;
}
if (S_ISDIR (statb.st_mode))
{
free (f);
goto bail;
}
free (f);
dtype = statb.st_mode;
#ifdef HAVE_STRUCT_DIRENT_D_TYPE
}
#endif
Adler32Update (&ctx, files[n]->d_name, dlen + 1);
Adler32Update (&ctx, (char *)&dtype, sizeof (int));
bail:
free (files[n]);
}
free (files);
if (ret == -1)
return -1;
*checksum = Adler32Finish (&ctx);
return 0;
}
#endif /* _WIN32 */
int
FcStatChecksum (const FcChar8 *file, struct stat *statb)
{
if (FcStat (file, statb) == -1)
return -1;
#ifndef _WIN32
/* We have a workaround of the broken stat() in FcStat() for Win32.
* No need to do something further more.
*/
if (FcIsFsMtimeBroken (file))
{
if (FcDirChecksum (file, &statb->st_mtime) == -1)
return -1;
}
#endif
return 0;
}
static int
FcFStatFs (int fd, FcStatFS *statb)
{
const char *p = NULL;
int ret = -1;
FcBool flag = FcFalse;
#if defined(HAVE_FSTATVFS) && (defined(HAVE_STRUCT_STATVFS_F_BASETYPE) || defined(HAVE_STRUCT_STATVFS_F_FSTYPENAME))
struct statvfs buf;
memset (statb, 0, sizeof (FcStatFS));
if ((ret = fstatvfs (fd, &buf)) == 0)
{
# if defined(HAVE_STRUCT_STATVFS_F_BASETYPE)
p = buf.f_basetype;
# elif defined(HAVE_STRUCT_STATVFS_F_FSTYPENAME)
p = buf.f_fstypename;
# endif
}
#elif defined(HAVE_FSTATFS) && (defined(HAVE_STRUCT_STATFS_F_FLAGS) || defined(HAVE_STRUCT_STATFS_F_FSTYPENAME) || defined(__linux__))
struct statfs buf;
memset (statb, 0, sizeof (FcStatFS));
if ((ret = fstatfs (fd, &buf)) == 0)
{
# if defined(HAVE_STRUCT_STATFS_F_FLAGS) && defined(MNT_LOCAL)
statb->is_remote_fs = !(buf.f_flags & MNT_LOCAL);
flag = FcTrue;
# endif
# if defined(HAVE_STRUCT_STATFS_F_FSTYPENAME)
p = buf.f_fstypename;
# elif defined(__linux__)
switch (buf.f_type)
{
case 0x6969: /* nfs */
statb->is_remote_fs = FcTrue;
break;
case 0x4d44: /* fat */
statb->is_mtime_broken = FcTrue;
break;
default:
break;
}
return ret;
# else
# error "BUG: No way to figure out with fstatfs()"
# endif
}
#endif
if (p)
{
if (!flag && strcmp (p, "nfs") == 0)
statb->is_remote_fs = FcTrue;
if (strcmp (p, "msdosfs") == 0 ||
strcmp (p, "pcfs") == 0)
statb->is_mtime_broken = FcTrue;
}
return ret;
}
FcBool
FcIsFsMmapSafe (int fd)
{
FcStatFS statb;
if (FcFStatFs (fd, &statb) < 0)
return FcTrue;
return !statb.is_remote_fs;
}
FcBool
FcIsFsMtimeBroken (const FcChar8 *dir)
{
int fd = FcOpen ((const char *) dir, O_RDONLY);
if (fd != -1)
{
FcStatFS statb;
int ret = FcFStatFs (fd, &statb);
close (fd);
if (ret < 0)
return FcFalse;
return statb.is_mtime_broken;
}
return FcFalse;
}
#define __fcstat__
#include "fcaliastail.h"
#undef __fcstat__