diff options
author | Denis Bitouzé <dbitouze@wanadoo.fr> | 2021-02-25 18:23:07 +0000 |
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committer | Denis Bitouzé <dbitouze@wanadoo.fr> | 2021-02-25 18:23:07 +0000 |
commit | c6101f91d071883b48b1b4b51e5eba0f36d9a78d (patch) | |
tree | 1bf7f5a881d7a4f5c5bf59d0b2821943dd822372 /Build/extra/djgpp/stat.c | |
parent | 07ee7222e389b0777456b427a55c22d0e6ffd267 (diff) |
French translation for tlmgr updated
git-svn-id: svn://tug.org/texlive/trunk@57912 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/extra/djgpp/stat.c')
-rw-r--r-- | Build/extra/djgpp/stat.c | 935 |
1 files changed, 0 insertions, 935 deletions
diff --git a/Build/extra/djgpp/stat.c b/Build/extra/djgpp/stat.c deleted file mode 100644 index 69fe270b848..00000000000 --- a/Build/extra/djgpp/stat.c +++ /dev/null @@ -1,935 +0,0 @@ -/* 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@is.elta.co.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 <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 *basename) -{ - 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(basename, '.'); - size_t total_len = strlen(basename); - int name_len = dot ? dot - basename : 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 & 0x000fffff; - 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, basename, 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(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(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 (canon_path[0]) != toupper (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]; - - strcpy(buf, pathname); - strcat(buf, "*.*"); - if (!__findfirst(buf, &ff_blk, FA_LABEL)) - 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 (ff_blk.ff_name[i]) != toupper (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; - - 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. */ - if (memchr(path, '*', pathlen) || memchr(path, '?', pathlen)) - { - errno = ENOENT; /* since no such filename is possible */ - return -1; - } - - 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 (stat(*argv, &stat_buf) != 0) - perror ("stat 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 (!stat(*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 - |