Mail Archives: djgpp-workers/2000/07/30/16:06:32
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This is probably the last part of my symlink patch which does
not require the symlink support itself. The patch is very big
because all the Eli's artwork of coding in stat() has been moved
to lstat(). That thing alone has added 70 kbytes. Unfortunately,
CVS has no way for expressing file moving.
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Index: src/docs/kb/wc204.txi
===================================================================
RCS file: /cvs/djgpp/djgpp/src/docs/kb/wc204.txi,v
retrieving revision 1.15
diff -u -r1.15 wc204.txi
--- wc204.txi 2000/07/26 17:54:44 1.15
+++ wc204.txi 2000/07/30 19:53:31
@@ -84,7 +84,9 @@
@email{restone@@skypoint.com, Richard E. Stone}.
@findex lchown AT r{, added to the library}
-New function @code{lchown} has been added for UNIX compatibility.
+@findex lstat AT r{, added to the library}
+New functions @code{lchown} and @code{lstat} have been added for
+UNIX compatibility.
@findex setitimer AT r{, and zero @code{it_interval.tv_usec}}
Calling the @code{setitimer} function with both
Index: src/libc/posix/sys/stat/lstat.c
===================================================================
RCS file: lstat.c
diff -N lstat.c
--- /dev/null Tue May 5 16:32:27 1998
+++ lstat.c Sun Jul 30 15:53:45 2000
@@ -0,0 +1,953 @@
+/* Copyright (C) 2000 DJ Delorie, see COPYING.DJ for details */
+/* Copyright (C) 1999 DJ Delorie, see COPYING.DJ for details */
+/* Copyright (C) 1998 DJ Delorie, see COPYING.DJ for details */
+/* Copyright (C) 1997 DJ Delorie, see COPYING.DJ for details */
+/* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */
+/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
+/* This is file LSTAT.C */
+/*
+ * Almost a 100% U**X-compatible stat()/lstat() substitute.
+ *
+ * Note:
+ *
+ * The actual function implemented here is lstat(), not stat(). The
+ * stat() now is just a lstat() wrapper.
+ *
+ * Rationale:
+ *
+ * Many Unix-born programs make heavy use of stat() library
+ * function to make decisions on files' equality, size, access
+ * attributes etc. In the MS-DOS environment, many implementations
+ * of stat() are crippled, because DOS makes it very hard to get to
+ * certain pieces of information about files and directories. Thus
+ * porting a program to DOS is usually an exercise in #ifdef'ing.
+ * This implementation facilitates porting Unix programs to MS-DOS
+ * by providing stat() which is much more Unix-compatible than those
+ * of most DOS-based C compilers (e.g., Borland's).
+ * Specifically, the following issues are taken care of:
+ *
+ * 1. This stat() doesn't fail for root directories, returning
+ * valid information.
+ * 2. Directory size is not reported zero; the number of used
+ * directory entries multiplied by entry size is returned instead.
+ * 3. Mode bits are set for all 3 groups (user, group, other).
+ * 4. Directories are NOT reported read-only, unless one of R, H or S
+ * attributes is set.
+ * 5. Directories have their execute bit set, as they do under Unix.
+ * 6. Device names (such as /dev/con, lpt1, aux etc.) are treated as
+ * if they were on a special drive called `@:' (st_dev = -1).
+ * The "character special" mode bit is set for these devices.
+ * 7. The inode number (st_ino) is taken from the starting cluster
+ * number of the file. If the cluster number is unavailable, it
+ * is invented using the file's name in a manner that minimizes
+ * the possibility of inventing an inode which already belongs
+ * to another file. See below for details.
+ * 8. Executable files are found based on files' extensions and
+ * magic numbers present at their beginning, and their execute
+ * bits are set.
+ *
+ * Lossage:
+ *
+ * Beautiful as the above sounds, this implementation does fail
+ * under certain circumstances. The following is a list of known
+ * problems:
+ *
+ * 1. The time fields for a root directory cannot be obtained, so
+ * they are set to the beginning of the Epoch.
+ * 2. For files which reside on networked drives, the inode number
+ * is invented, because network redirectors usually do not
+ * bring that info with them. This is not a total lossage, but
+ * it could get us a different inode for each program run.
+ * 3. Empty files do not have a starting cluster number, because
+ * DOS doesn't allocate one until you actually write something
+ * to a file. For these the inode is also invented.
+ * 4. If the st_ino field is a 16 bit number, the invented inode
+ * numbers are from 65535 and down, assuming that most disks have
+ * unused portions near their end. Valid cluster numbers are 16-bit
+ * unsigned integers, so a possibility of a clash exists, although
+ * the last 80 or more cluster numbers are unused on all drives
+ * I've seen. If the st_ino is 32 bit, then invented inodes are
+ * all greater than 64k, which totally eliminates a possibility
+ * of a clash with an actual cluster number.
+ * 5. The method of computing directory size is an approximation:
+ * a directory might consume much more space, if it has many
+ * deleted entries. Still, this is a close approximation, and
+ * it does follow the logic of reporting size for a regular file:
+ * only the actually used space is returned.
+ * 6. As this implementation relies heavily on undocumented DOS
+ * features, it will fail to get actual file info in environments
+ * other than native DOS, such as DR-DOS, OS/2 etc. For these,
+ * the function will return whatever info is available with
+ * conventional DOS calls, which is no less than any other
+ * implementation could do. This stat() might also fail for
+ * future DOS versions, if the layout of internal DOS data
+ * area is changed; however, this seems unlikely.
+ *
+ * Copyright (c) 1994-96 Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
+ *
+ * This software may be used freely so long as this copyright notice is
+ * left intact. There is no warranty on this software.
+ *
+ */
+
+/*
+ * Tested with DJGPP port of GNU C compiler, versions 1.11maint5 and 1.12,
+ * under MS-DOS 3.3, 4.01, 5.0, 6.20 (with and without DoubleSpace) and
+ * with networked drives under XFS 1.86, Novell Netware 3.22, and
+ * TSoft NFS 0.24Beta.
+ *
+ */
+
+#include <libc/stubs.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <time.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dos.h>
+#include <dir.h>
+#include <sys/fsext.h>
+#include <dpmi.h>
+#include <go32.h>
+#include <libc/farptrgs.h>
+#include <libc/bss.h>
+#include <libc/dosio.h>
+
+#include "xstat.h"
+
+int __getdisk(void);
+int __findfirst(const char *, struct ffblk *, int);
+int __findnext(struct ffblk *);
+
+#define ALL_FILES (FA_RDONLY|FA_HIDDEN|FA_SYSTEM|FA_DIREC|FA_ARCH)
+
+#define _STAT_INODE 1 /* should we bother getting inode numbers? */
+#define _STAT_EXEC_EXT 2 /* get execute bits from file extension? */
+#define _STAT_EXEC_MAGIC 4 /* get execute bits from magic signature? */
+#define _STAT_DIRSIZE 8 /* compute directory size? */
+#define _STAT_ROOT_TIME 0x10 /* try to get root dir time stamp? */
+#define _STAT_WRITEBIT 0x20 /* fstat() needs write bit? */
+
+/* Should we bother about executables at all? */
+#define _STAT_EXECBIT (_STAT_EXEC_EXT | _STAT_EXEC_MAGIC)
+
+/* The structure of the full directory entry. This is the 32-byte
+ record present for each file/subdirectory in a DOS directory.
+ Although the ``packed'' attribute seems to be unnecessary, I use
+ it to be sure it will still work for future versions of GCC. */
+
+struct full_dirent {
+ char fname[8] __attribute__ ((packed));
+ char fext[3] __attribute__ ((packed));
+ unsigned char fattr __attribute__ ((packed));
+ unsigned char freserved[10] __attribute__ ((packed));
+ unsigned short ftime __attribute__ ((packed));
+ unsigned short fdate __attribute__ ((packed));
+ unsigned short fcluster __attribute__ ((packed));
+ unsigned int fsize __attribute__ ((packed));
+};
+
+
+/* Static variables to speed up SDA DOS Swappable Data Area access on
+ subsequent calls. */
+
+/* The count of number of SDA's we have. It is more than 1 for DOS
+ 4.x only. If it has a value of 0, the function init_dirent_table()
+ will be called to compute the addresses where we are to look for
+ directory entry of our file. A value of -1 means this method is
+ unsupported for this version of DOS. */
+static int dirent_count;
+
+/* The table of places to look for our directory entry.
+ Each entry in the table is a linear offset from the beginning of
+ conventional memory which points to a particular location within
+ one of the SDA's, where the entry of a file being stat()'ed could
+ appear. The offsets are computed once (when the routine is first
+ called) and then reused for other calls. The actual storage for
+ the table is malloc()'ed when this function is first called. */
+static unsigned int * dirent_table;
+
+/* When we have only one SDA, this is where its only place to look for
+ directory entry is stored. */
+static unsigned int dirent_place;
+
+/* This holds the fail bits from the last call to init_dirent_table(),
+ so we can return them every time get_inode_from_sda() is called. */
+static unsigned short init_dirent_table_bits;
+
+/* Holds the last seen value of __bss_count, to be safe for
+ restarted programs (emacs). */
+static int stat_count = -1;
+
+/*
+ * Parts of the following code is derived from file DOSSWAP.C,
+ * which came with ``Undocumented DOS'', 1st edition.
+ */
+
+/* Compute table of pointers to look for directory entry of a file. */
+static int
+init_dirent_table (void)
+{
+ short get_sda_func;
+ unsigned short dirent_offset;
+ unsigned short true_dos_version;
+ unsigned short dos_major, dos_minor;
+ __dpmi_regs regs;
+
+ if (dirent_count == -1) /* we already tried and found we can't */
+ return 0;
+
+ /* Compute INT 21h function number and offset of directory entry
+ from start of SDA. These depend on the DOS version.
+ We need exact knowledge about DOS internals, so we need the
+ TRUE DOS version (not the simulated one by SETVER), if that's
+ available. */
+ true_dos_version = _get_dos_version(1);
+ dos_major = true_dos_version >> 8;
+ dos_minor = true_dos_version & 0xff;
+
+ if ((dos_major == 3) && (dos_minor >= 10))
+ {
+ get_sda_func = 0x5d06;
+ dirent_offset = 0x1a7;
+ }
+ else if (dos_major == 4)
+ {
+ /* According to ``Undocumented DOS, 2nd edition'', I could have
+ used 5d06 here, as for DOS 5 and above, but I like to be
+ defensive. In fact, the above book itself uses 5d0b, contrary
+ to its own recommendation. */
+ get_sda_func = 0x5d0b;
+ dirent_offset = 0x1b3;
+ }
+ else if (dos_major >= 5)
+ {
+ get_sda_func = 0x5d06;
+ dirent_offset = 0x1b3;
+ }
+ else
+ {
+ _djstat_fail_bits |= _STFAIL_OSVER;
+ dirent_count = -1;
+ return 0;
+ }
+
+ _djstat_fail_bits &= ~_STFAIL_OSVER; /* version is OK */
+
+ /* Get the pointer to SDA by calling undocumented function 5dh of INT 21. */
+ regs.x.ax = get_sda_func;
+ __dpmi_int(0x21, ®s);
+ if (regs.x.flags & 1)
+ {
+ _djstat_fail_bits |= _STFAIL_SDA;
+ dirent_count = -1; /* if the call failed, never try this later */
+ return 0;
+ }
+
+ _djstat_fail_bits &= ~_STFAIL_SDA; /* Get SDA succeeded */
+
+ /* DOS 4.x might have several SDA's, which means we might have more
+ than one place to look into. (It is typical of DOS 4 to complicate
+ things.)
+ Compute all the possible addresses where we will have to look. */
+ if (dos_major == 4)
+ {
+ /* The pointer returned by INT 21h, AX=5D0b points to a header
+ which holds a number of SDA's and then an array of that number
+ of records each one of which includes address of an SDA (DWORD)
+ and its length and type (encoded in a WORD).
+ While walking this list of SDA's, we add to each pointer the
+ offset of directory entry and stash the resulting address in
+ our table for later use. */
+
+ int sda_list_walker = MK_FOFF(regs.x.ds, regs.x.si);
+ int i;
+ int *tbl;
+
+ dirent_count = _farpeekw(_dos_ds, sda_list_walker); /* number of SDA's */
+
+ /* Allocate storage for table. */
+ tbl = dirent_table = (int *)malloc(dirent_count*sizeof(int));
+ if (!dirent_table)
+ {
+ /* If malloc() failed, maybe later it will succeed, so don't
+ store -1 in dirent_count. */
+ dirent_count = 0;
+ _djstat_fail_bits |= _STFAIL_DCOUNT;
+ return 0;
+ }
+
+ memset(dirent_table, 0, dirent_count*sizeof(int));
+ _djstat_fail_bits &= ~_STFAIL_DCOUNT; /* dirent_count seems OK */
+
+ /* Walk the array of pointers, computing addresses of directory
+ entries and stashing them in our table. */
+ _farsetsel(_dos_ds);
+ for (i = dirent_count, sda_list_walker += 2; i--; sda_list_walker += 6)
+ {
+ int sda_start = _farnspeekl(sda_list_walker);
+ unsigned short sda_len = _farnspeekw(sda_list_walker + 4) & 0x7fff;
+
+ /* Let's be defensive here: if this SDA is too short to have
+ place for directory entry, we won't use it. */
+ if (sda_len > dirent_offset)
+ *tbl++ = sda_start + dirent_offset;
+ else
+ dirent_count--;
+ }
+ }
+
+ /* DOS 3.1 and 5.0 or later. We have only one SDA pointed to by
+ whatever INT 21h, AH=5d returns. */
+ else
+ {
+ dirent_count = 1;
+ dirent_place = MK_FOFF(regs.x.ds, regs.x.si) + dirent_offset;
+ dirent_table = &dirent_place;
+ }
+
+ return 1;
+}
+
+/* Get inode number by searching DOS Swappable Data Area.
+ The entire directory entry for a file found by FindFirst/FindNext
+ appears at a certain (version-dependent) offset in the SDA after
+ one of those function is called.
+ Should be called immediately after calling DOS FindFirst function,
+ before the info is overwritten by somebody who calls it again. */
+static unsigned int
+get_inode_from_sda(const char *mybasename)
+{
+ int count = dirent_count;
+ unsigned int * dirent_p = dirent_table;
+ unsigned short dos_mem_base = _dos_ds;
+ unsigned short our_mem_base = _my_ds();
+ char * dot = strchr(mybasename, '.');
+ size_t total_len = strlen(mybasename);
+ int name_len = dot ? dot - mybasename : total_len;
+ int ext_len = dot ? total_len - name_len - 1 : 0;
+ int cluster_offset = offsetof(struct full_dirent, fcluster);
+
+ /* Restore failure bits set by last call to init_dirent_table(), so
+ they will be reported as if it were called now. */
+ _djstat_fail_bits |= init_dirent_table_bits;
+
+ /* Force reinitialization in restarted programs (emacs). */
+ if (stat_count != __bss_count)
+ {
+ stat_count = __bss_count;
+ dirent_count = 0;
+ }
+
+ /* Initialize the table of SDA entries where we are to look for
+ our file. */
+ if (!dirent_count && !init_dirent_table())
+ {
+ /* Don't save the truename failure bit. */
+ init_dirent_table_bits = (_djstat_fail_bits & ~_STFAIL_TRUENAME);
+ return 0;
+ }
+ init_dirent_table_bits = (_djstat_fail_bits & ~_STFAIL_TRUENAME);
+ if (dirent_count == -1)
+ return 0;
+
+ count = dirent_count;
+ dirent_p = dirent_table;
+
+ _farsetsel(dos_mem_base);
+
+ /* This is DOS 4.x lossage: this loop might execute many times.
+ For other DOS versions it is executed exactly once. */
+ while (count--)
+ {
+ unsigned int src_address = *dirent_p;
+ char cmp_buf[sizeof(struct full_dirent)];
+
+ /* Copy the directory entry from the SDA to local storage.
+ The filename is stored there in infamous DOS format: name and
+ extension blank-padded to 8/3 characters, no dot between them. */
+ movedata(dos_mem_base, src_address, our_mem_base, (unsigned int)cmp_buf,
+ sizeof(struct full_dirent));
+
+ /* If this is the filename we are looking for, return
+ its starting cluster. */
+ if (!strncmp(cmp_buf, mybasename, name_len) &&
+ (ext_len == 0 || !strncmp(cmp_buf + 8, dot + 1, ext_len)))
+ return (unsigned int)_farnspeekw(*dirent_p + cluster_offset);
+
+ /* This is not our file. Search more, if more addresses left. */
+ dirent_p++;
+ }
+
+ /* If not found, give up. */
+ _djstat_fail_bits |= _STFAIL_BADSDA;
+ return 0;
+}
+
+int _ioctl_get_first_cluster(const char *);
+
+/* Get the number of the first cluster of PATHNAME using
+ the IOCTL call Int 21h/AX=440Dh/CX=0871h, if that call
+ is supported by the OS. Return the cluster number, or
+ a negative number if this service isn't supported. */
+
+int
+_ioctl_get_first_cluster(const char *pathname)
+{
+ __dpmi_regs r;
+
+ /* See if the IOCTL GetFirstCluster call is supported. */
+ r.x.ax = 0x4411; /* query generic IOCTL capability by drive */
+ r.h.bl = pathname[0] & 0x1f; /* drive number (1=A:) */
+ r.x.cx = 0x871;
+ __dpmi_int(0x21, &r);
+ if ((r.x.flags & 1) == 0 && r.x.ax == 0)
+ {
+ r.x.ax = 0x440d; /* Generic IOCTL */
+ r.x.cx = 0x0871; /* category code 08h, minor code 71h */
+ r.x.bx = 1; /* pathname uses current OEM character set */
+ r.x.ds = __tb >> 4;
+ r.x.dx = __tb & 0x0f;
+ _put_path(pathname);
+ __dpmi_int(0x21, &r);
+ if ((r.x.flags & 1) == 0)
+ return ( ((int)r.x.dx << 16) + r.x.ax );
+ }
+ return -1;
+}
+
+static char blanks_8[] = " ";
+
+static int
+stat_assist(const char *path, struct stat *statbuf)
+{
+ struct ffblk ff_blk;
+ char canon_path[MAX_TRUE_NAME];
+ char pathname[MAX_TRUE_NAME];
+ short drv_no;
+ unsigned dos_ftime;
+
+ _djstat_fail_bits = 0;
+
+ memset(statbuf, 0, sizeof(struct stat));
+ memset(&dos_ftime, 0, sizeof(dos_ftime));
+
+ /* Fields which are constant under DOS. */
+ statbuf->st_uid = getuid();
+ statbuf->st_gid = getgid();
+ statbuf->st_nlink = 1;
+#ifndef NO_ST_BLKSIZE
+ statbuf->st_blksize = _go32_info_block.size_of_transfer_buffer;
+#endif
+
+ /* Make the path explicit. This makes the rest of our job much
+ easier by getting rid of some constructs which, if present,
+ confuse `_truename' and/or `findfirst'. In particular, it
+ deletes trailing slashes, makes "d:" explicit, and allows us
+ to make an illusion of having a ".." entry in root directories. */
+ _fixpath (path, pathname);
+
+ /* Get the drive number. It is always explicit, since we
+ called `_fixpath' on the original pathname. */
+ drv_no = toupper((unsigned char)pathname[0]) - 'A';
+
+ /* Produce canonical pathname, with all the defaults resolved and
+ all redundant parts removed. This calls undocumented DOS
+ function 60h. */
+ if (_truename(path, canon_path) || _truename(pathname, canon_path))
+ {
+ /* Detect character device names which must be treated specially.
+ We could simply call FindFirst and test the 6th bit, but some
+ versions of DOS have trouble with this (see Ralph Brown's
+ Interrupt List, ``214E'', under `Bugs'). Instead we use
+ truename() which calls INT 21/AX=6000H. For character devices
+ it returns X:/DEVNAME, where ``X'' is the current drive letter
+ (note the FORWARD slash!). E.g., for CON or \dev\con it will
+ return C:/CON.
+ We will pretend that devices all reside on a special drive
+ called `@', which corresponds to st_dev = -1. This is because
+ these devices have no files, and we must invent inode numbers
+ for them; this scheme allows to lower a risk of clash between
+ invented inode and one which belongs to a real file. This is
+ also compatible with what our fstat() does.
+ */
+ char_dev:
+ if (canon_path[2] == '/')
+ {
+ char dev_name[9]; /* devices are at most 8 characters long */
+
+ strncpy(dev_name, canon_path + 3, 8); /* the name without `X:/' */
+ dev_name[8] = '\0';
+ strcpy(canon_path, "@:\\dev\\");
+ strcat(canon_path, dev_name);
+ strncat(canon_path, blanks_8, 8 - strlen(dev_name)); /* blank-pad */
+ canon_path[15] = '\0'; /* ensure zero-termination */
+
+ /* Invent inode */
+ statbuf->st_ino = _invent_inode(canon_path, 0, 0);
+
+ /* Device code. */
+ statbuf->st_dev = -1;
+#ifdef HAVE_ST_RDEV
+ statbuf->st_rdev = -1;
+#endif
+
+ /* Set mode bits, including character special bit.
+ Should we treat printer devices as write-only? */
+ statbuf->st_mode |= (S_IFCHR | READ_ACCESS | WRITE_ACCESS);
+
+ /* We will arrange things so that devices have current time in
+ the access-time and modified-time fields of struct stat, and
+ zero (the beginning of times) in creation-time field. This
+ is consistent with what DOS FindFirst function returns for
+ character device names (if it succeeds--see above). */
+ statbuf->st_atime = statbuf->st_mtime = time(0);
+ statbuf->st_ctime = _file_time_stamp(dos_ftime);
+
+ return 0;
+ }
+ else if (canon_path[0] >= 'A' && canon_path[0] <= 'z' &&
+ canon_path[1] == ':' && canon_path[2] == '\\')
+ {
+ /* _truename() returned a name with a drive letter. (This is
+ always so for local drives, but some network redirectors
+ also do this.) We will take this to be the TRUE drive
+ letter, because _truename() knows about SUBST and JOIN.
+ If the canonicalized path returns in the UNC form (which
+ means the drive is remote), it cannot be SUBSTed or JOINed,
+ because SUBST.EXE and JOIN.EXE won't let you do it; so, for
+ these cases, there is no problem in believing the drive
+ number we've got from the original path (or is there?). */
+ drv_no = toupper((unsigned char)canon_path[0]) - 'A';
+ }
+ }
+ else
+ {
+ /* _truename() failed. (This really shouldn't happen, but who knows?)
+ At least uppercase all letters, convert forward slashes to backward
+ ones, and pray... */
+ register const char *src = pathname;
+ register char *dst = canon_path;
+
+ while ( (*dst = (*src > 'a' && *src < 'z'
+ ? *src++ - ('a' - 'A')
+ : *src++)) != '\0')
+ {
+ if (*dst == '/')
+ *dst = '\\';
+ dst++;
+ }
+
+ _djstat_fail_bits |= _STFAIL_TRUENAME;
+ }
+
+ /* Call DOS FindFirst function, which will bring us most of the info. */
+ if (!__findfirst(pathname, &ff_blk, ALL_FILES))
+ {
+ /* Time fields. */
+ dos_ftime =
+ ( (unsigned short)ff_blk.ff_fdate << 16 ) +
+ (unsigned short)ff_blk.ff_ftime;
+
+ /* If the IOCTL GetFirstCluster call is available, try it first. */
+ if ( (_djstat_flags & _STAT_INODE) == 0
+ && (statbuf->st_ino = _ioctl_get_first_cluster(pathname)) <= 0)
+ {
+
+ /* For networked drives, don't believe the starting cluster
+ that the network redirector feeds us; always invent inode.
+ This is because network redirectors leave bogus values there,
+ and we don't have enough info to decide if the starting
+ cluster value is real or just a left-over from previous call.
+ For local files, try first using DOS SDA to get the inode from
+ the file's starting cluster number; if that fails, invent inode.
+ Note that the if clause below tests for non-zero value returned
+ by is_remote_drive(), which includes possible failure (-1).
+ This is because findfirst() already succeeded for our pathname,
+ and therefore the drive is a legal one; the only possibility that
+ is_remote_drive() fails is that some network redirector takes
+ over IOCTL functions in an incompatible way, which means the
+ drive is remote. QED. */
+ if (statbuf->st_ino == 0 /* don't try SDA if IOCTL call succeeded */
+ || _is_remote_drive(drv_no)
+ || (statbuf->st_ino = get_inode_from_sda(ff_blk.ff_name)) == 0)
+ {
+ _djstat_fail_bits |= _STFAIL_HASH;
+ statbuf->st_ino =
+ _invent_inode(canon_path, dos_ftime, ff_blk.ff_fsize);
+ }
+ else if (toupper ((unsigned char)canon_path[0]) != toupper ((unsigned char)pathname[0])
+ && canon_path[1] == ':'
+ && canon_path[2] == '\\'
+ && canon_path[3] == '\0')
+ /* The starting cluster in SDA for the root of JOINed drive
+ actually belongs to the directory where that drive is
+ ``mounted''. This can potentially be the cluster of
+ another file on the JOINed drive. We cannot allow this. */
+ statbuf->st_ino = 1;
+ }
+
+ /* File size. */
+ statbuf->st_size = ff_blk.ff_fsize;
+
+ /* Mode bits. */
+ statbuf->st_mode |= READ_ACCESS;
+ if ( !(ff_blk.ff_attrib & 0x07) ) /* no R, H or S bits set */
+ statbuf->st_mode |= WRITE_ACCESS;
+
+ /* Sometimes `_truename' doesn't return X:/FOO for character
+ devices. However, FindFirst returns attribute 40h for them. */
+ if (ff_blk.ff_attrib == 0x40)
+ {
+ size_t cplen = strlen (canon_path);
+ char *pslash = canon_path + cplen - 1;
+
+ while (pslash > canon_path + 2 && *pslash != '\\')
+ pslash--;
+
+ /* Force it into X:/FOO form. */
+ if (canon_path[1] == ':')
+ {
+ if (pslash > canon_path + 2)
+ memmove (canon_path + 2, pslash,
+ cplen - (pslash - canon_path) + 1);
+ canon_path[2] = '/';
+ goto char_dev;
+ }
+ }
+
+ /* Directories should have Execute bits set. */
+ if (ff_blk.ff_attrib & 0x10)
+ statbuf->st_mode |= (S_IFDIR | EXEC_ACCESS);
+
+ else
+ {
+ /* This is a regular file. */
+ char *extension = strrchr(ff_blk.ff_name, '.');
+
+ /* Set regular file bit. */
+ statbuf->st_mode |= S_IFREG;
+
+ if ((_djstat_flags & _STAT_EXECBIT) != _STAT_EXECBIT)
+ {
+ /* Set execute bits based on file's extension and
+ first 2 bytes. */
+ if (extension)
+ extension++; /* get past the dot */
+ if (_is_executable(pathname, -1, extension))
+ statbuf->st_mode |= EXEC_ACCESS;
+ }
+ }
+ }
+ else if ((_djstat_fail_bits & _STFAIL_TRUENAME))
+ {
+ /* If both `findfirst' and `_truename' failed, this must
+ be a non-existent file or an illegal/inaccessible drive. */
+ if (errno == ENMFILE)
+ errno = ENODEV;
+ return -1;
+ }
+ else if (pathname[3] == '\0')
+ {
+ /* Detect root directories. These are special because, unlike
+ subdirectories, FindFirst fails for them. We look at PATHNAME
+ because a network redirector could tweak what `_truename'
+ returns to be utterly unrecognizable as root directory. PATHNAME
+ always begins with "d:/", so it is root if PATHNAME[3] = 0. */
+
+ /* Mode bits. */
+ statbuf->st_mode |= (S_IFDIR|READ_ACCESS|WRITE_ACCESS|EXEC_ACCESS);
+
+ /* Root directory will have an inode = 1. Valid cluster numbers
+ for real files under DOS start with 2. */
+ statbuf->st_ino = 1;
+
+ /* Simulate zero size. This is what FindFirst returns for every
+ sub-directory. Later we might compute a better approximation
+ (see below). */
+ ff_blk.ff_fsize = 0L;
+
+ /* The time fields are left to be zero, unless the user wants us
+ to try harder. In the latter case, we check if the root has
+ a volume label entry, and use its time if it has. */
+
+ if ( (_djstat_flags & _STAT_ROOT_TIME) == 0 )
+ {
+ char buf[7];
+ int volume_found = 0;
+
+ strcpy(buf, pathname);
+ strcat(buf, "*.*");
+ /* Floppies written by Windows 9X and NT include entries
+ that have volume label bit set, but are actually parts
+ of an LFN entry. Non-LFN platforms might be fooled to
+ take them as volume labels, and report bogus time stamps. */
+ volume_found = __findfirst(buf, &ff_blk, FA_LABEL) == 0;
+ while (volume_found
+ && (ff_blk.ff_attrib & (FA_HIDDEN|FA_SYSTEM)) != 0)
+ volume_found = __findnext(&ff_blk) == 0;
+ if (volume_found)
+ dos_ftime = ( (unsigned)ff_blk.ff_fdate << 16 ) + ff_blk.ff_ftime;
+ else
+ _djstat_fail_bits |= _STFAIL_LABEL;
+ }
+ }
+ else
+ {
+ int e = errno; /* errno value from original FindFirst on PATHNAME */
+ int i = 0;
+ int j = strlen (pathname) - 1;
+
+ /* Check for volume labels. We did not mix FA_LABEL with
+ other attributes in the call to `__findfirst' above,
+ because some environments will return bogus info in
+ that case. For instance, Win95 and WinNT seem to
+ ignore `pathname' and return the volume label even if it
+ doesn't fit the name in `pathname'. This fools us to
+ think that a non-existent file exists and is a volume
+ label. Hence we test the returned name to be PATHNAME. */
+ if (!__findfirst(pathname, &ff_blk, FA_LABEL))
+ {
+ i = strlen (ff_blk.ff_name) - 1;
+
+ if (j >= i)
+ {
+ for ( ; i >= 0 && j >= 0; i--, j--)
+ if (toupper ((unsigned char)ff_blk.ff_name[i]) != toupper ((unsigned char)pathname[j]))
+ break;
+ }
+ }
+
+ if (i < 0 && pathname[j] == '/')
+ {
+ /* Indeed a label. */
+ statbuf->st_mode = READ_ACCESS;
+#ifdef S_IFLABEL
+ statbuf->st_mode |= S_IFLABEL;
+#endif
+ statbuf->st_ino = 1;
+ statbuf->st_size = 0;
+ dos_ftime = ( (unsigned)ff_blk.ff_fdate << 16 ) + ff_blk.ff_ftime;
+ }
+ else
+ {
+ /* FindFirst on volume labels might set errno to ENMFILE or even
+ to something more strange like EINVAl; correct that. */
+ errno = e; /* restore errno from the original FindFirst */
+ if (errno == ENMFILE)
+ errno = ENOENT;
+ return -1;
+ }
+ }
+
+ /* Device code. */
+ statbuf->st_dev = drv_no;
+#ifdef HAVE_ST_RDEV
+ statbuf->st_rdev = drv_no;
+#endif
+
+ /* Time fields. */
+ statbuf->st_atime = statbuf->st_mtime = statbuf->st_ctime =
+ _file_time_stamp(dos_ftime);
+
+ if ( ! strcmp(ff_blk.lfn_magic,"LFN32") )
+ {
+ unsigned xtime;
+ xtime = *(unsigned *)&ff_blk.lfn_ctime;
+ if(xtime) /* May be zero if file written w/o lfn active */
+ statbuf->st_ctime = _file_time_stamp(xtime);
+ xtime = *(unsigned *)&ff_blk.lfn_atime;
+ if(xtime > dos_ftime) /* Accessed time is date only, no time */
+ statbuf->st_atime = _file_time_stamp(xtime);
+ }
+
+ if ( (statbuf->st_mode & S_IFMT) == S_IFDIR
+ && (_djstat_flags & _STAT_DIRSIZE) == 0 )
+ {
+ /* Under DOS, directory entries for subdirectories have
+ zero size. Therefore, FindFirst brings us zero size
+ when called on a directory. (Some network redirectors
+ might do a better job, thus below we also test for zero size
+ actually being returned.) If we have zero-size directory,
+ we compute here the actual directory size by reading its
+ entries, then multiply their number by 32 (the size of a
+ directory entry under DOS). This might lose in the case
+ that many files were deleted from a once huge directory,
+ because AFAIK, directories don't return unused clusters to
+ the disk pool. Still, it is a good approximation of the
+ actual directory size.
+
+ We also take this opportunity to return the number of links
+ for directories as Unix programs expect it to be: the number
+ of subdirectories, plus 2 (the directory itself and the ``.''
+ entry).
+
+ The (max) size of the root directory could also be taken from
+ the disk BIOS Parameter Block (BPB) which can be obtained
+ by calling IOCTL (INT 21/AH=44H), subfunction 0DH, minor
+ function 60H. But we will treat all directories the same,
+ even at performance cost, because it's more robust for
+ networked drives. */
+
+ size_t pathlen = strlen (pathname);
+ char lastc = pathname[pathlen - 1];
+ char *search_spec = (char *)alloca (pathlen + 10); /* need only +5 */
+ int nfiles = 0, nsubdirs = 0, done;
+ size_t extra = 0;
+ int add_extra = 0;
+
+ strcpy(search_spec, pathname);
+ if (lastc == '/')
+ strcat(search_spec, "*.*");
+ else
+ strcat(search_spec, "/*.*");
+
+ if (statbuf->st_size == 0 && _USE_LFN)
+ {
+ /* VFAT filesystems use additional directory entries to
+ store the long filenames. */
+ char fstype[40];
+
+ if ((_get_volume_info(pathname,0,0,fstype) & _FILESYS_LFN_SUPPORTED)
+ && strncmp(fstype, "FAT", 4) == 0)
+ add_extra = 1;
+ }
+
+ /* Count files and subdirectories. */
+ for (done = __findfirst(search_spec, &ff_blk, ALL_FILES);
+ !done;
+ done = __findnext(&ff_blk))
+ {
+ register char *fname = ff_blk.ff_name;
+
+ /* Don't count "." and ".." entries. This will show empty
+ directories as size 0. */
+ if (! (fname[0] == '.'
+ && (fname[1] == '\0'
+ || (fname[1] == '.'
+ && fname[2] == '\0'))))
+ {
+ char fn[13];
+
+ nfiles++;
+ if (ff_blk.ff_attrib & 0x10)
+ nsubdirs++;
+ /* For each 13 characters of the long filename, a
+ 32-byte directory entry is used. */
+ if (add_extra && strcmp(_lfn_gen_short_fname(fname, fn), fname))
+ extra += (strlen(fname) + 12) / 13;
+ }
+ }
+
+ statbuf->st_nlink = nsubdirs + 2;
+ if (statbuf->st_size == 0)
+ statbuf->st_size = (nfiles + extra) * sizeof(struct full_dirent);
+ }
+
+ return 0;
+}
+
+/* Main entry point. This is library lstat() function.
+ */
+
+int
+lstat(const char *path, struct stat *statbuf)
+{
+ int e = errno;
+ int pathlen, ret;
+
+ if (!path || !statbuf)
+ {
+ errno = EFAULT;
+ return -1;
+ }
+
+ if ((pathlen = strlen (path)) >= MAX_TRUE_NAME)
+ {
+ errno = ENAMETOOLONG;
+ return -1;
+ }
+
+ /* Fail if PATH includes wildcard characters supported by FindFirst,
+ or if it is empty. */
+ if (memchr(path, '*', pathlen) || memchr(path, '?', pathlen)
+ || path[0] == '\0')
+ {
+ errno = ENOENT; /* since no such filename is possible */
+ return -1;
+ }
+
+ if (__FSEXT_call_open_handlers(__FSEXT_stat, &ret, &path))
+ return ret;
+
+ if (stat_assist(path, statbuf) == -1)
+ {
+ return -1; /* errno set by stat_assist() */
+ }
+ else
+ {
+ errno = e;
+ return 0;
+ }
+}
+
+#ifdef TEST
+
+unsigned short _djstat_flags = 0;
+
+void
+main(int argc, char *argv[])
+{
+ struct stat stat_buf;
+ char *endp;
+
+ if (argc < 2)
+ {
+ fprintf (stderr, "Usage: %s <_djstat_flags> <file...>\n", argv[0]);
+ exit(0);
+ }
+
+ if (lstat(*argv, &stat_buf) != 0)
+ perror ("lstat failed on argv[0]");
+ else
+ fprintf(stderr, "DOS %d.%d (%s)\n", _osmajor, _osminor, _os_flavor);
+ argc--; argv++;
+
+ _djstat_flags = (unsigned short)strtoul(*argv, &endp, 0);
+ argc--; argv++;
+
+ while (argc--)
+ {
+ if (!lstat(*argv, &stat_buf))
+ {
+ fprintf(stderr, "%s: %d %6u %o %d %d %ld %lu %s", *argv,
+ stat_buf.st_dev,
+ (unsigned)stat_buf.st_ino,
+ stat_buf.st_mode,
+ stat_buf.st_nlink,
+ stat_buf.st_uid,
+ (long)stat_buf.st_size,
+ (unsigned long)stat_buf.st_mtime,
+ ctime(&stat_buf.st_mtime));
+ _djstat_describe_lossage(stderr);
+ }
+ else
+ {
+ fprintf(stderr, "%s: lossage", *argv);
+ perror(" ");
+ _djstat_describe_lossage(stderr);
+ }
+
+ ++argv;
+ }
+
+ exit (0);
+}
+
+#endif
Index: src/libc/posix/sys/stat/lstat.txh
===================================================================
RCS file: lstat.txh
diff -N lstat.txh
--- /dev/null Tue May 5 16:32:27 1998
+++ lstat.txh Sun Jul 30 15:53:46 2000
@@ -0,0 +1,117 @@
+@node lstat, io
+@subheading Syntax
+
+@example
+#include <sys/stat.h>
+
+int lstat(const char *file, struct stat *sbuf);
+@end example
+
+@subheading Description
+
+This function obtains the status of the file @var{file} and stores
+it in @var{sbuf}, which has this structure:
+
+@smallexample
+struct stat @{
+ time_t st_atime; /* time of last access */
+ time_t st_ctime; /* time of file's creation */
+ dev_t st_dev; /* The drive number (0 = a:) */
+ gid_t st_gid; /* what getgid() returns */
+ ino_t st_ino; /* starting cluster or unique identifier */
+ mode_t st_mode; /* file mode - S_IF* and S_IRUSR/S_IWUSR */
+ time_t st_mtime; /* time that the file was last written */
+ nlink_t st_nlink; /* 2 + number of subdirs, or 1 for files */
+ off_t st_size; /* size of file in bytes */
+ off_t st_blksize; /* the size of transfer buffer */
+ uid_t st_uid; /* what getuid() returns */
+@};
+@end smallexample
+
+The @code{st_atime}, @code{st_ctime} and @code{st_mtime} have different
+values only when long file names are supported (e.g. on Windows 9X);
+otherwise, they all have the same value: the time that the file was last
+written AT footnote{
+Even when long file names @emph{are} supported, the three time values
+returned by @code{stat} might be identical if the file was last written
+by a program which used legacy DOS functions that don't know about long
+file names.}. Most Windows 9X VFAT filesystems only support the date of
+the file's last access (the time is set to zero); therefore, the DJGPP
+implementation of @code{stat} sets the @code{st_atime} member to the
+same value as @code{st_mtime} if the time part of @code{st_atime}
+returned by the filesystem is zero (to prevent the situation where the
+file appears to have been created @emph{after} it was last accessed,
+which doesn't look good).
+
+Some members of @code{struct stat} are very expensive to compute. If
+your application is a heavy user of @code{stat} and is too slow, you can
+disable computation of the members your application doesn't need, as
+described in @ref{_djstat_flags}.
+
+@subheading Return Value
+
+Zero on success, nonzero on failure (and @var{errno} set).
+
+@subheading Portability
+
+@portability !ansi, !posix
+
+@subheading Example
+
+@example
+struct stat s;
+lstat("data.txt", &s);
+if (S_ISDIR(s.st_mode))
+ printf("is directory\n");
+@end example
+
+@subheading Implementation Notes
+
+Supplying a 100% Unix-compatible @code{lstat} function under DOS is an
+implementation nightmare. The following notes describe some of the
+obscure points specific to @code{lstat}s behavior in DJGPP.
+
+1. The @samp{drive} for character devices (like @code{con}, @code{/dev/null}
+and others is returned as -1. For drives networked by Novell Netware, it
+is returned as -2.
+
+2. The starting cluster number of a file serves as its inode number. For
+files whose starting cluster number is inaccessible (empty files, files on
+Windows 9X, on networked drives, etc.) the @code{st_inode} field will be
+@emph{invented}
+in a way which guarantees that no two different files will get the same
+inode number (thus it is unique). This invented inode will also be
+different from any real cluster number of any local file. However, only
+on plain DOS, and only for local, non-empty files/directories the inode
+is guaranteed to be consistent between @code{stat} and @code{fstat}
+function calls.
+
+3. The WRITE access mode bit is set only for the user (unless the file is
+read-only, hidden or system). EXECUTE bit is set for directories, files
+which can be executed from the DOS prompt (batch files, .com, .dll and .exe
+executables) or run by @code{go32-v2}.
+
+4. Size of directories is reported as the number of its files (sans `.' and
+`..' entries) multiplied by 32 bytes (the size of directory entry). On FAT
+filesystems that support the LFN API (such as Windows 9X), the reported
+size of the directory accounts for additional space used to store the long
+file names.
+
+5. Time stamp for root directories is taken from the volume label entry,
+if that's available; otherwise, it is reported as 1-Jan-1980.
+
+6. The variable @code{_djstat_flags} (@pxref{_djstat_flags}) controls
+what hard-to-get fields of @code{struct stat} are needed by the
+application.
+
+7. @code{stat} should not be used to get an up-to-date info about a file
+which is open and has been written to, because @code{stat} will only
+return correct data after the file is closed. Use @code{fstat}
+(@pxref{fstat}) while the file is open. Alternatively, you can call
+@code{fflush} and @code{fsync} to make the OS flush all the file's data
+to the disk, before calling @code{stat}.
+
+8. The number of links @code{st_nlink} is always 1 for files other than
+directories. For directories, it is the number of subdirectories plus
+2. This is so that programs written for Unix that depend on this to
+optimize recursive traversal of the directory tree, will still work.
Index: src/libc/posix/sys/stat/makefile
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/posix/sys/stat/makefile,v
retrieving revision 1.1
diff -u -r1.1 makefile
--- makefile 1995/04/05 05:59:56 1.1
+++ makefile 2000/07/30 19:53:46
@@ -6,6 +6,7 @@
SRC += fixpath.c
SRC += fstat.c
SRC += is_exec.c
+SRC += lstat.c
SRC += mkdir.c
SRC += mkfifo.c
SRC += st_loss.c
Index: src/libc/posix/sys/stat/stat.c
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/posix/sys/stat/stat.c,v
retrieving revision 1.7
diff -u -r1.7 stat.c
--- stat.c 1999/06/03 17:27:40 1.7
+++ stat.c 2000/07/30 19:53:46
@@ -1,898 +1,27 @@
+/* Copyright (C) 2000 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1999 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1998 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1997 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
-/* This is file STAT.C */
-/*
- * Almost a 100% U**X-compatible stat() substitute.
- *
- * Usage:
- *
- * That's easy: put this into libc.a, then just call stat() as usual.
- *
- * Rationale:
- *
- * Many Unix-born programs make heavy use of stat() library
- * function to make decisions on files' equality, size, access
- * attributes etc. In the MS-DOS environment, many implementations
- * of stat() are crippled, because DOS makes it very hard to get to
- * certain pieces of information about files and directories. Thus
- * porting a program to DOS is usually an exercise in #ifdef'ing.
- * This implementation facilitates porting Unix programs to MS-DOS
- * by providing stat() which is much more Unix-compatible than those
- * of most DOS-based C compilers (e.g., Borland's).
- * Specifically, the following issues are taken care of:
- *
- * 1. This stat() doesn't fail for root directories, returning
- * valid information.
- * 2. Directory size is not reported zero; the number of used
- * directory entries multiplied by entry size is returned instead.
- * 3. Mode bits are set for all 3 groups (user, group, other).
- * 4. Directories are NOT reported read-only, unless one of R, H or S
- * attributes is set.
- * 5. Directories have their execute bit set, as they do under Unix.
- * 6. Device names (such as /dev/con, lpt1, aux etc.) are treated as
- * if they were on a special drive called `@:' (st_dev = -1).
- * The "character special" mode bit is set for these devices.
- * 7. The inode number (st_ino) is taken from the starting cluster
- * number of the file. If the cluster number is unavailable, it
- * is invented using the file's name in a manner that minimizes
- * the possibility of inventing an inode which already belongs
- * to another file. See below for details.
- * 8. Executable files are found based on files' extensions and
- * magic numbers present at their beginning, and their execute
- * bits are set.
- *
- * Lossage:
- *
- * Beautiful as the above sounds, this implementation does fail
- * under certain circumstances. The following is a list of known
- * problems:
- *
- * 1. The time fields for a root directory cannot be obtained, so
- * they are set to the beginning of the Epoch.
- * 2. For files which reside on networked drives, the inode number
- * is invented, because network redirectors usually do not
- * bring that info with them. This is not a total lossage, but
- * it could get us a different inode for each program run.
- * 3. Empty files do not have a starting cluster number, because
- * DOS doesn't allocate one until you actually write something
- * to a file. For these the inode is also invented.
- * 4. If the st_ino field is a 16 bit number, the invented inode
- * numbers are from 65535 and down, assuming that most disks have
- * unused portions near their end. Valid cluster numbers are 16-bit
- * unsigned integers, so a possibility of a clash exists, although
- * the last 80 or more cluster numbers are unused on all drives
- * I've seen. If the st_ino is 32 bit, then invented inodes are
- * all greater than 64k, which totally eliminates a possibility
- * of a clash with an actual cluster number.
- * 5. The method of computing directory size is an approximation:
- * a directory might consume much more space, if it has many
- * deleted entries. Still, this is a close approximation, and
- * it does follow the logic of reporting size for a regular file:
- * only the actually used space is returned.
- * 6. As this implementation relies heavily on undocumented DOS
- * features, it will fail to get actual file info in environments
- * other than native DOS, such as DR-DOS, OS/2 etc. For these,
- * the function will return whatever info is available with
- * conventional DOS calls, which is no less than any other
- * implementation could do. This stat() might also fail for
- * future DOS versions, if the layout of internal DOS data
- * area is changed; however, this seems unlikely.
- *
- * Copyright (c) 1994-96 Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
- *
- * This software may be used freely so long as this copyright notice is
- * left intact. There is no warranty on this software.
- *
- */
-/*
- * Tested with DJGPP port of GNU C compiler, versions 1.11maint5 and 1.12,
- * under MS-DOS 3.3, 4.01, 5.0, 6.20 (with and without DoubleSpace) and
- * with networked drives under XFS 1.86, Novell Netware 3.22, and
- * TSoft NFS 0.24Beta.
- *
+/* Main entry point. This is library stat() function.
+ Actual code has been moved to lstat() in lstat.c.
*/
-#include <libc/stubs.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <unistd.h>
-#include <time.h>
-#include <stdio.h>
-#include <string.h>
-#include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <sys/types.h>
#include <sys/stat.h>
-#include <dos.h>
-#include <dir.h>
-#include <sys/fsext.h>
-#include <dpmi.h>
-#include <go32.h>
-#include <libc/farptrgs.h>
-#include <libc/bss.h>
-#include <libc/dosio.h>
+#include <errno.h>
+#include <stdio.h>
+#include <libc/symlink.h>
+#ifdef TEST
#include "xstat.h"
-
-int __getdisk(void);
-int __findfirst(const char *, struct ffblk *, int);
-int __findnext(struct ffblk *);
-
-#define ALL_FILES (FA_RDONLY|FA_HIDDEN|FA_SYSTEM|FA_DIREC|FA_ARCH)
-
-#define _STAT_INODE 1 /* should we bother getting inode numbers? */
-#define _STAT_EXEC_EXT 2 /* get execute bits from file extension? */
-#define _STAT_EXEC_MAGIC 4 /* get execute bits from magic signature? */
-#define _STAT_DIRSIZE 8 /* compute directory size? */
-#define _STAT_ROOT_TIME 0x10 /* try to get root dir time stamp? */
-#define _STAT_WRITEBIT 0x20 /* fstat() needs write bit? */
-
-/* Should we bother about executables at all? */
-#define _STAT_EXECBIT (_STAT_EXEC_EXT | _STAT_EXEC_MAGIC)
-
-/* The structure of the full directory entry. This is the 32-byte
- record present for each file/subdirectory in a DOS directory.
- Although the ``packed'' attribute seems to be unnecessary, I use
- it to be sure it will still work for future versions of GCC. */
-
-struct full_dirent {
- char fname[8] __attribute__ ((packed));
- char fext[3] __attribute__ ((packed));
- unsigned char fattr __attribute__ ((packed));
- unsigned char freserved[10] __attribute__ ((packed));
- unsigned short ftime __attribute__ ((packed));
- unsigned short fdate __attribute__ ((packed));
- unsigned short fcluster __attribute__ ((packed));
- unsigned int fsize __attribute__ ((packed));
-};
-
-
-/* Static variables to speed up SDA DOS Swappable Data Area access on
- subsequent calls. */
-
-/* The count of number of SDA's we have. It is more than 1 for DOS
- 4.x only. If it has a value of 0, the function init_dirent_table()
- will be called to compute the addresses where we are to look for
- directory entry of our file. A value of -1 means this method is
- unsupported for this version of DOS. */
-static int dirent_count;
-
-/* The table of places to look for our directory entry.
- Each entry in the table is a linear offset from the beginning of
- conventional memory which points to a particular location within
- one of the SDA's, where the entry of a file being stat()'ed could
- appear. The offsets are computed once (when the routine is first
- called) and then reused for other calls. The actual storage for
- the table is malloc()'ed when this function is first called. */
-static unsigned int * dirent_table;
-
-/* When we have only one SDA, this is where its only place to look for
- directory entry is stored. */
-static unsigned int dirent_place;
-
-/* This holds the fail bits from the last call to init_dirent_table(),
- so we can return them every time get_inode_from_sda() is called. */
-static unsigned short init_dirent_table_bits;
-
-/* Holds the last seen value of __bss_count, to be safe for
- restarted programs (emacs). */
-static int stat_count = -1;
-
-/*
- * Parts of the following code is derived from file DOSSWAP.C,
- * which came with ``Undocumented DOS'', 1st edition.
- */
-
-/* Compute table of pointers to look for directory entry of a file. */
-static int
-init_dirent_table (void)
-{
- short get_sda_func;
- unsigned short dirent_offset;
- unsigned short true_dos_version;
- unsigned short dos_major, dos_minor;
- __dpmi_regs regs;
-
- if (dirent_count == -1) /* we already tried and found we can't */
- return 0;
-
- /* Compute INT 21h function number and offset of directory entry
- from start of SDA. These depend on the DOS version.
- We need exact knowledge about DOS internals, so we need the
- TRUE DOS version (not the simulated one by SETVER), if that's
- available. */
- true_dos_version = _get_dos_version(1);
- dos_major = true_dos_version >> 8;
- dos_minor = true_dos_version & 0xff;
-
- if ((dos_major == 3) && (dos_minor >= 10))
- {
- get_sda_func = 0x5d06;
- dirent_offset = 0x1a7;
- }
- else if (dos_major == 4)
- {
- /* According to ``Undocumented DOS, 2nd edition'', I could have
- used 5d06 here, as for DOS 5 and above, but I like to be
- defensive. In fact, the above book itself uses 5d0b, contrary
- to its own recommendation. */
- get_sda_func = 0x5d0b;
- dirent_offset = 0x1b3;
- }
- else if (dos_major >= 5)
- {
- get_sda_func = 0x5d06;
- dirent_offset = 0x1b3;
- }
- else
- {
- _djstat_fail_bits |= _STFAIL_OSVER;
- dirent_count = -1;
- return 0;
- }
-
- _djstat_fail_bits &= ~_STFAIL_OSVER; /* version is OK */
-
- /* Get the pointer to SDA by calling undocumented function 5dh of INT 21. */
- regs.x.ax = get_sda_func;
- __dpmi_int(0x21, ®s);
- if (regs.x.flags & 1)
- {
- _djstat_fail_bits |= _STFAIL_SDA;
- dirent_count = -1; /* if the call failed, never try this later */
- return 0;
- }
-
- _djstat_fail_bits &= ~_STFAIL_SDA; /* Get SDA succeeded */
-
- /* DOS 4.x might have several SDA's, which means we might have more
- than one place to look into. (It is typical of DOS 4 to complicate
- things.)
- Compute all the possible addresses where we will have to look. */
- if (dos_major == 4)
- {
- /* The pointer returned by INT 21h, AX=5D0b points to a header
- which holds a number of SDA's and then an array of that number
- of records each one of which includes address of an SDA (DWORD)
- and its length and type (encoded in a WORD).
- While walking this list of SDA's, we add to each pointer the
- offset of directory entry and stash the resulting address in
- our table for later use. */
-
- int sda_list_walker = MK_FOFF(regs.x.ds, regs.x.si);
- int i;
- int *tbl;
-
- dirent_count = _farpeekw(_dos_ds, sda_list_walker); /* number of SDA's */
-
- /* Allocate storage for table. */
- tbl = dirent_table = (int *)malloc(dirent_count*sizeof(int));
- if (!dirent_table)
- {
- /* If malloc() failed, maybe later it will succeed, so don't
- store -1 in dirent_count. */
- dirent_count = 0;
- _djstat_fail_bits |= _STFAIL_DCOUNT;
- return 0;
- }
-
- memset(dirent_table, 0, dirent_count*sizeof(int));
- _djstat_fail_bits &= ~_STFAIL_DCOUNT; /* dirent_count seems OK */
-
- /* Walk the array of pointers, computing addresses of directory
- entries and stashing them in our table. */
- _farsetsel(_dos_ds);
- for (i = dirent_count, sda_list_walker += 2; i--; sda_list_walker += 6)
- {
- int sda_start = _farnspeekl(sda_list_walker);
- unsigned short sda_len = _farnspeekw(sda_list_walker + 4) & 0x7fff;
-
- /* Let's be defensive here: if this SDA is too short to have
- place for directory entry, we won't use it. */
- if (sda_len > dirent_offset)
- *tbl++ = sda_start + dirent_offset;
- else
- dirent_count--;
- }
- }
-
- /* DOS 3.1 and 5.0 or later. We have only one SDA pointed to by
- whatever INT 21h, AH=5d returns. */
- else
- {
- dirent_count = 1;
- dirent_place = MK_FOFF(regs.x.ds, regs.x.si) + dirent_offset;
- dirent_table = &dirent_place;
- }
-
- return 1;
-}
-
-/* Get inode number by searching DOS Swappable Data Area.
- The entire directory entry for a file found by FindFirst/FindNext
- appears at a certain (version-dependent) offset in the SDA after
- one of those function is called.
- Should be called immediately after calling DOS FindFirst function,
- before the info is overwritten by somebody who calls it again. */
-static unsigned int
-get_inode_from_sda(const char *mybasename)
-{
- int count = dirent_count;
- unsigned int * dirent_p = dirent_table;
- unsigned short dos_mem_base = _dos_ds;
- unsigned short our_mem_base = _my_ds();
- char * dot = strchr(mybasename, '.');
- size_t total_len = strlen(mybasename);
- int name_len = dot ? dot - mybasename : total_len;
- int ext_len = dot ? total_len - name_len - 1 : 0;
- int cluster_offset = offsetof(struct full_dirent, fcluster);
-
- /* Restore failure bits set by last call to init_dirent_table(), so
- they will be reported as if it were called now. */
- _djstat_fail_bits |= init_dirent_table_bits;
-
- /* Force reinitialization in restarted programs (emacs). */
- if (stat_count != __bss_count)
- {
- stat_count = __bss_count;
- dirent_count = 0;
- }
-
- /* Initialize the table of SDA entries where we are to look for
- our file. */
- if (!dirent_count && !init_dirent_table())
- {
- /* Don't save the truename failure bit. */
- init_dirent_table_bits = (_djstat_fail_bits & ~_STFAIL_TRUENAME);
- return 0;
- }
- init_dirent_table_bits = (_djstat_fail_bits & ~_STFAIL_TRUENAME);
- if (dirent_count == -1)
- return 0;
-
- count = dirent_count;
- dirent_p = dirent_table;
-
- _farsetsel(dos_mem_base);
-
- /* This is DOS 4.x lossage: this loop might execute many times.
- For other DOS versions it is executed exactly once. */
- while (count--)
- {
- unsigned int src_address = *dirent_p;
- char cmp_buf[sizeof(struct full_dirent)];
-
- /* Copy the directory entry from the SDA to local storage.
- The filename is stored there in infamous DOS format: name and
- extension blank-padded to 8/3 characters, no dot between them. */
- movedata(dos_mem_base, src_address, our_mem_base, (unsigned int)cmp_buf,
- sizeof(struct full_dirent));
-
- /* If this is the filename we are looking for, return
- its starting cluster. */
- if (!strncmp(cmp_buf, mybasename, name_len) &&
- (ext_len == 0 || !strncmp(cmp_buf + 8, dot + 1, ext_len)))
- return (unsigned int)_farnspeekw(*dirent_p + cluster_offset);
-
- /* This is not our file. Search more, if more addresses left. */
- dirent_p++;
- }
-
- /* If not found, give up. */
- _djstat_fail_bits |= _STFAIL_BADSDA;
- return 0;
-}
-
-int _ioctl_get_first_cluster(const char *);
-
-/* Get the number of the first cluster of PATHNAME using
- the IOCTL call Int 21h/AX=440Dh/CX=0871h, if that call
- is supported by the OS. Return the cluster number, or
- a negative number if this service isn't supported. */
-
-int
-_ioctl_get_first_cluster(const char *pathname)
-{
- __dpmi_regs r;
-
- /* See if the IOCTL GetFirstCluster call is supported. */
- r.x.ax = 0x4411; /* query generic IOCTL capability by drive */
- r.h.bl = pathname[0] & 0x1f; /* drive number (1=A:) */
- r.x.cx = 0x871;
- __dpmi_int(0x21, &r);
- if ((r.x.flags & 1) == 0 && r.x.ax == 0)
- {
- r.x.ax = 0x440d; /* Generic IOCTL */
- r.x.cx = 0x0871; /* category code 08h, minor code 71h */
- r.x.bx = 1; /* pathname uses current OEM character set */
- r.x.ds = __tb >> 4;
- r.x.dx = __tb & 0x0f;
- _put_path(pathname);
- __dpmi_int(0x21, &r);
- if ((r.x.flags & 1) == 0)
- return ( ((int)r.x.dx << 16) + r.x.ax );
- }
- return -1;
-}
-
-static char blanks_8[] = " ";
-
-static int
-stat_assist(const char *path, struct stat *statbuf)
-{
- struct ffblk ff_blk;
- char canon_path[MAX_TRUE_NAME];
- char pathname[MAX_TRUE_NAME];
- short drv_no;
- unsigned dos_ftime;
-
- _djstat_fail_bits = 0;
-
- memset(statbuf, 0, sizeof(struct stat));
- memset(&dos_ftime, 0, sizeof(dos_ftime));
-
- /* Fields which are constant under DOS. */
- statbuf->st_uid = getuid();
- statbuf->st_gid = getgid();
- statbuf->st_nlink = 1;
-#ifndef NO_ST_BLKSIZE
- statbuf->st_blksize = _go32_info_block.size_of_transfer_buffer;
-#endif
-
- /* Make the path explicit. This makes the rest of our job much
- easier by getting rid of some constructs which, if present,
- confuse `_truename' and/or `findfirst'. In particular, it
- deletes trailing slashes, makes "d:" explicit, and allows us
- to make an illusion of having a ".." entry in root directories. */
- _fixpath (path, pathname);
-
- /* Get the drive number. It is always explicit, since we
- called `_fixpath' on the original pathname. */
- drv_no = toupper((unsigned char)pathname[0]) - 'A';
-
- /* Produce canonical pathname, with all the defaults resolved and
- all redundant parts removed. This calls undocumented DOS
- function 60h. */
- if (_truename(path, canon_path) || _truename(pathname, canon_path))
- {
- /* Detect character device names which must be treated specially.
- We could simply call FindFirst and test the 6th bit, but some
- versions of DOS have trouble with this (see Ralph Brown's
- Interrupt List, ``214E'', under `Bugs'). Instead we use
- truename() which calls INT 21/AX=6000H. For character devices
- it returns X:/DEVNAME, where ``X'' is the current drive letter
- (note the FORWARD slash!). E.g., for CON or \dev\con it will
- return C:/CON.
- We will pretend that devices all reside on a special drive
- called `@', which corresponds to st_dev = -1. This is because
- these devices have no files, and we must invent inode numbers
- for them; this scheme allows to lower a risk of clash between
- invented inode and one which belongs to a real file. This is
- also compatible with what our fstat() does.
- */
- char_dev:
- if (canon_path[2] == '/')
- {
- char dev_name[9]; /* devices are at most 8 characters long */
-
- strncpy(dev_name, canon_path + 3, 8); /* the name without `X:/' */
- dev_name[8] = '\0';
- strcpy(canon_path, "@:\\dev\\");
- strcat(canon_path, dev_name);
- strncat(canon_path, blanks_8, 8 - strlen(dev_name)); /* blank-pad */
- canon_path[15] = '\0'; /* ensure zero-termination */
-
- /* Invent inode */
- statbuf->st_ino = _invent_inode(canon_path, 0, 0);
-
- /* Device code. */
- statbuf->st_dev = -1;
-#ifdef HAVE_ST_RDEV
- statbuf->st_rdev = -1;
-#endif
-
- /* Set mode bits, including character special bit.
- Should we treat printer devices as write-only? */
- statbuf->st_mode |= (S_IFCHR | READ_ACCESS | WRITE_ACCESS);
-
- /* We will arrange things so that devices have current time in
- the access-time and modified-time fields of struct stat, and
- zero (the beginning of times) in creation-time field. This
- is consistent with what DOS FindFirst function returns for
- character device names (if it succeeds--see above). */
- statbuf->st_atime = statbuf->st_mtime = time(0);
- statbuf->st_ctime = _file_time_stamp(dos_ftime);
-
- return 0;
- }
- else if (canon_path[0] >= 'A' && canon_path[0] <= 'z' &&
- canon_path[1] == ':' && canon_path[2] == '\\')
- {
- /* _truename() returned a name with a drive letter. (This is
- always so for local drives, but some network redirectors
- also do this.) We will take this to be the TRUE drive
- letter, because _truename() knows about SUBST and JOIN.
- If the canonicalized path returns in the UNC form (which
- means the drive is remote), it cannot be SUBSTed or JOINed,
- because SUBST.EXE and JOIN.EXE won't let you do it; so, for
- these cases, there is no problem in believing the drive
- number we've got from the original path (or is there?). */
- drv_no = toupper((unsigned char)canon_path[0]) - 'A';
- }
- }
- else
- {
- /* _truename() failed. (This really shouldn't happen, but who knows?)
- At least uppercase all letters, convert forward slashes to backward
- ones, and pray... */
- register const char *src = pathname;
- register char *dst = canon_path;
-
- while ( (*dst = (*src > 'a' && *src < 'z'
- ? *src++ - ('a' - 'A')
- : *src++)) != '\0')
- {
- if (*dst == '/')
- *dst = '\\';
- dst++;
- }
-
- _djstat_fail_bits |= _STFAIL_TRUENAME;
- }
-
- /* Call DOS FindFirst function, which will bring us most of the info. */
- if (!__findfirst(pathname, &ff_blk, ALL_FILES))
- {
- /* Time fields. */
- dos_ftime =
- ( (unsigned short)ff_blk.ff_fdate << 16 ) +
- (unsigned short)ff_blk.ff_ftime;
-
- /* If the IOCTL GetFirstCluster call is available, try it first. */
- if ( (_djstat_flags & _STAT_INODE) == 0
- && (statbuf->st_ino = _ioctl_get_first_cluster(pathname)) <= 0)
- {
-
- /* For networked drives, don't believe the starting cluster
- that the network redirector feeds us; always invent inode.
- This is because network redirectors leave bogus values there,
- and we don't have enough info to decide if the starting
- cluster value is real or just a left-over from previous call.
- For local files, try first using DOS SDA to get the inode from
- the file's starting cluster number; if that fails, invent inode.
- Note that the if clause below tests for non-zero value returned
- by is_remote_drive(), which includes possible failure (-1).
- This is because findfirst() already succeeded for our pathname,
- and therefore the drive is a legal one; the only possibility that
- is_remote_drive() fails is that some network redirector takes
- over IOCTL functions in an incompatible way, which means the
- drive is remote. QED. */
- if (statbuf->st_ino == 0 /* don't try SDA if IOCTL call succeeded */
- || _is_remote_drive(drv_no)
- || (statbuf->st_ino = get_inode_from_sda(ff_blk.ff_name)) == 0)
- {
- _djstat_fail_bits |= _STFAIL_HASH;
- statbuf->st_ino =
- _invent_inode(canon_path, dos_ftime, ff_blk.ff_fsize);
- }
- else if (toupper ((unsigned char)canon_path[0]) != toupper ((unsigned char)pathname[0])
- && canon_path[1] == ':'
- && canon_path[2] == '\\'
- && canon_path[3] == '\0')
- /* The starting cluster in SDA for the root of JOINed drive
- actually belongs to the directory where that drive is
- ``mounted''. This can potentially be the cluster of
- another file on the JOINed drive. We cannot allow this. */
- statbuf->st_ino = 1;
- }
-
- /* File size. */
- statbuf->st_size = ff_blk.ff_fsize;
-
- /* Mode bits. */
- statbuf->st_mode |= READ_ACCESS;
- if ( !(ff_blk.ff_attrib & 0x07) ) /* no R, H or S bits set */
- statbuf->st_mode |= WRITE_ACCESS;
-
- /* Sometimes `_truename' doesn't return X:/FOO for character
- devices. However, FindFirst returns attribute 40h for them. */
- if (ff_blk.ff_attrib == 0x40)
- {
- size_t cplen = strlen (canon_path);
- char *pslash = canon_path + cplen - 1;
-
- while (pslash > canon_path + 2 && *pslash != '\\')
- pslash--;
-
- /* Force it into X:/FOO form. */
- if (canon_path[1] == ':')
- {
- if (pslash > canon_path + 2)
- memmove (canon_path + 2, pslash,
- cplen - (pslash - canon_path) + 1);
- canon_path[2] = '/';
- goto char_dev;
- }
- }
-
- /* Directories should have Execute bits set. */
- if (ff_blk.ff_attrib & 0x10)
- statbuf->st_mode |= (S_IFDIR | EXEC_ACCESS);
-
- else
- {
- /* This is a regular file. */
- char *extension = strrchr(ff_blk.ff_name, '.');
-
- /* Set regular file bit. */
- statbuf->st_mode |= S_IFREG;
-
- if ((_djstat_flags & _STAT_EXECBIT) != _STAT_EXECBIT)
- {
- /* Set execute bits based on file's extension and
- first 2 bytes. */
- if (extension)
- extension++; /* get past the dot */
- if (_is_executable(pathname, -1, extension))
- statbuf->st_mode |= EXEC_ACCESS;
- }
- }
- }
- else if ((_djstat_fail_bits & _STFAIL_TRUENAME))
- {
- /* If both `findfirst' and `_truename' failed, this must
- be a non-existent file or an illegal/inaccessible drive. */
- if (errno == ENMFILE)
- errno = ENODEV;
- return -1;
- }
- else if (pathname[3] == '\0')
- {
- /* Detect root directories. These are special because, unlike
- subdirectories, FindFirst fails for them. We look at PATHNAME
- because a network redirector could tweak what `_truename'
- returns to be utterly unrecognizable as root directory. PATHNAME
- always begins with "d:/", so it is root if PATHNAME[3] = 0. */
-
- /* Mode bits. */
- statbuf->st_mode |= (S_IFDIR|READ_ACCESS|WRITE_ACCESS|EXEC_ACCESS);
-
- /* Root directory will have an inode = 1. Valid cluster numbers
- for real files under DOS start with 2. */
- statbuf->st_ino = 1;
-
- /* Simulate zero size. This is what FindFirst returns for every
- sub-directory. Later we might compute a better approximation
- (see below). */
- ff_blk.ff_fsize = 0L;
-
- /* The time fields are left to be zero, unless the user wants us
- to try harder. In the latter case, we check if the root has
- a volume label entry, and use its time if it has. */
-
- if ( (_djstat_flags & _STAT_ROOT_TIME) == 0 )
- {
- char buf[7];
- int volume_found = 0;
-
- strcpy(buf, pathname);
- strcat(buf, "*.*");
- /* Floppies written by Windows 9X and NT include entries
- that have volume label bit set, but are actually parts
- of an LFN entry. Non-LFN platforms might be fooled to
- take them as volume labels, and report bogus time stamps. */
- volume_found = __findfirst(buf, &ff_blk, FA_LABEL) == 0;
- while (volume_found
- && (ff_blk.ff_attrib & (FA_HIDDEN|FA_SYSTEM)) != 0)
- volume_found = __findnext(&ff_blk) == 0;
- if (volume_found)
- dos_ftime = ( (unsigned)ff_blk.ff_fdate << 16 ) + ff_blk.ff_ftime;
- else
- _djstat_fail_bits |= _STFAIL_LABEL;
- }
- }
- else
- {
- int e = errno; /* errno value from original FindFirst on PATHNAME */
- int i = 0;
- int j = strlen (pathname) - 1;
-
- /* Check for volume labels. We did not mix FA_LABEL with
- other attributes in the call to `__findfirst' above,
- because some environments will return bogus info in
- that case. For instance, Win95 and WinNT seem to
- ignore `pathname' and return the volume label even if it
- doesn't fit the name in `pathname'. This fools us to
- think that a non-existent file exists and is a volume
- label. Hence we test the returned name to be PATHNAME. */
- if (!__findfirst(pathname, &ff_blk, FA_LABEL))
- {
- i = strlen (ff_blk.ff_name) - 1;
-
- if (j >= i)
- {
- for ( ; i >= 0 && j >= 0; i--, j--)
- if (toupper ((unsigned char)ff_blk.ff_name[i]) != toupper ((unsigned char)pathname[j]))
- break;
- }
- }
-
- if (i < 0 && pathname[j] == '/')
- {
- /* Indeed a label. */
- statbuf->st_mode = READ_ACCESS;
-#ifdef S_IFLABEL
- statbuf->st_mode |= S_IFLABEL;
#endif
- statbuf->st_ino = 1;
- statbuf->st_size = 0;
- dos_ftime = ( (unsigned)ff_blk.ff_fdate << 16 ) + ff_blk.ff_ftime;
- }
- else
- {
- /* FindFirst on volume labels might set errno to ENMFILE or even
- to something more strange like EINVAl; correct that. */
- errno = e; /* restore errno from the original FindFirst */
- if (errno == ENMFILE)
- errno = ENOENT;
- return -1;
- }
- }
-
- /* Device code. */
- statbuf->st_dev = drv_no;
-#ifdef HAVE_ST_RDEV
- statbuf->st_rdev = drv_no;
-#endif
-
- /* Time fields. */
- statbuf->st_atime = statbuf->st_mtime = statbuf->st_ctime =
- _file_time_stamp(dos_ftime);
-
- if ( ! strcmp(ff_blk.lfn_magic,"LFN32") )
- {
- unsigned xtime;
- xtime = *(unsigned *)&ff_blk.lfn_ctime;
- if(xtime) /* May be zero if file written w/o lfn active */
- statbuf->st_ctime = _file_time_stamp(xtime);
- xtime = *(unsigned *)&ff_blk.lfn_atime;
- if(xtime > dos_ftime) /* Accessed time is date only, no time */
- statbuf->st_atime = _file_time_stamp(xtime);
- }
-
- if ( (statbuf->st_mode & S_IFMT) == S_IFDIR
- && (_djstat_flags & _STAT_DIRSIZE) == 0 )
- {
- /* Under DOS, directory entries for subdirectories have
- zero size. Therefore, FindFirst brings us zero size
- when called on a directory. (Some network redirectors
- might do a better job, thus below we also test for zero size
- actually being returned.) If we have zero-size directory,
- we compute here the actual directory size by reading its
- entries, then multiply their number by 32 (the size of a
- directory entry under DOS). This might lose in the case
- that many files were deleted from a once huge directory,
- because AFAIK, directories don't return unused clusters to
- the disk pool. Still, it is a good approximation of the
- actual directory size.
-
- We also take this opportunity to return the number of links
- for directories as Unix programs expect it to be: the number
- of subdirectories, plus 2 (the directory itself and the ``.''
- entry).
-
- The (max) size of the root directory could also be taken from
- the disk BIOS Parameter Block (BPB) which can be obtained
- by calling IOCTL (INT 21/AH=44H), subfunction 0DH, minor
- function 60H. But we will treat all directories the same,
- even at performance cost, because it's more robust for
- networked drives. */
-
- size_t pathlen = strlen (pathname);
- char lastc = pathname[pathlen - 1];
- char *search_spec = (char *)alloca (pathlen + 10); /* need only +5 */
- int nfiles = 0, nsubdirs = 0, done;
- size_t extra = 0;
- int add_extra = 0;
-
- strcpy(search_spec, pathname);
- if (lastc == '/')
- strcat(search_spec, "*.*");
- else
- strcat(search_spec, "/*.*");
-
- if (statbuf->st_size == 0 && _USE_LFN)
- {
- /* VFAT filesystems use additional directory entries to
- store the long filenames. */
- char fstype[40];
-
- if ((_get_volume_info(pathname,0,0,fstype) & _FILESYS_LFN_SUPPORTED)
- && strncmp(fstype, "FAT", 4) == 0)
- add_extra = 1;
- }
-
- /* Count files and subdirectories. */
- for (done = __findfirst(search_spec, &ff_blk, ALL_FILES);
- !done;
- done = __findnext(&ff_blk))
- {
- register char *fname = ff_blk.ff_name;
-
- /* Don't count "." and ".." entries. This will show empty
- directories as size 0. */
- if (! (fname[0] == '.'
- && (fname[1] == '\0'
- || (fname[1] == '.'
- && fname[2] == '\0'))))
- {
- char fn[13];
-
- nfiles++;
- if (ff_blk.ff_attrib & 0x10)
- nsubdirs++;
- /* For each 13 characters of the long filename, a
- 32-byte directory entry is used. */
- if (add_extra && strcmp(_lfn_gen_short_fname(fname, fn), fname))
- extra += (strlen(fname) + 12) / 13;
- }
- }
-
- statbuf->st_nlink = nsubdirs + 2;
- if (statbuf->st_size == 0)
- statbuf->st_size = (nfiles + extra) * sizeof(struct full_dirent);
- }
-
- return 0;
-}
-
-/* Main entry point. This is library stat() function.
- */
int
stat(const char *path, struct stat *statbuf)
{
- int e = errno;
- int pathlen, ret;
-
- if (!path || !statbuf)
- {
- errno = EFAULT;
- return -1;
- }
-
- if ((pathlen = strlen (path)) >= MAX_TRUE_NAME)
- {
- errno = ENAMETOOLONG;
- return -1;
- }
-
- /* Fail if PATH includes wildcard characters supported by FindFirst,
- or if it is empty. */
- if (memchr(path, '*', pathlen) || memchr(path, '?', pathlen)
- || path[0] == '\0')
- {
- errno = ENOENT; /* since no such filename is possible */
- return -1;
- }
-
- if (__FSEXT_call_open_handlers(__FSEXT_stat, &ret, &path))
- return ret;
-
- if (stat_assist(path, statbuf) == -1)
- {
- return -1; /* errno set by stat_assist() */
- }
- else
- {
- errno = e;
- return 0;
- }
+ return lstat(path, statbuf);
}
#ifdef TEST
@@ -949,4 +78,3 @@
}
#endif
-
Index: src/libc/posix/sys/stat/xstat.c
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/posix/sys/stat/xstat.c,v
retrieving revision 1.2
diff -u -r1.2 xstat.c
--- xstat.c 2000/06/19 18:00:57 1.2
+++ xstat.c 2000/07/30 19:53:47
@@ -3,7 +3,7 @@
/*
* This is file XSTAT.C
*
- * Internal assist functions which are common to stat() and fstat().
+ * Internal assist functions which are common to stat(), fstat() and lstat().
*
*
* Copyright (c) 1994-96 Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Index: src/libc/posix/sys/stat/xstat.h
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/posix/sys/stat/xstat.h,v
retrieving revision 1.3
diff -u -r1.3 xstat.h
--- xstat.h 1996/08/12 23:58:18 1.3
+++ xstat.h 2000/07/30 19:53:48
@@ -1,7 +1,7 @@
/* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
/*
- * Header for internal stat()/fstat() assist functions.
+ * Header for internal stat()/fstat()/lstat() assist functions.
*
*/
--------------EBC11F080C9A35523A985EEB--
- Raw text -