/* File IO for GNU Emacs.
-Copyright (C) 1985-1988, 1993-2012 Free Software Foundation, Inc.
+Copyright (C) 1985-1988, 1993-2013 Free Software Foundation, Inc.
This file is part of GNU Emacs.
#include <selinux/context.h>
#endif
+#ifdef HAVE_POSIX_ACL
+#include <sys/acl.h>
+#endif
+
#include <c-ctype.h>
#include "lisp.h"
#endif
#include "systime.h"
+#include <allocator.h>
+#include <careadlinkat.h>
#include <stat-time.h>
#ifdef HPUX
/* Set by auto_save_1 if an error occurred during the last auto-save. */
static bool auto_save_error_occurred;
+/* If VALID_TIMESTAMP_FILE_SYSTEM, then TIMESTAMP_FILE_SYSTEM is the device
+ number of a file system where time stamps were observed to to work. */
+static bool valid_timestamp_file_system;
+static dev_t timestamp_file_system;
+
/* The symbol bound to coding-system-for-read when
insert-file-contents is called for recovering a file. This is not
an actual coding system name, but just an indicator to tell
static Lisp_Object Qset_file_times;
static Lisp_Object Qfile_selinux_context;
static Lisp_Object Qset_file_selinux_context;
+static Lisp_Object Qfile_acl;
+static Lisp_Object Qset_file_acl;
static Lisp_Object Qfile_newer_than_file_p;
Lisp_Object Qinsert_file_contents;
+Lisp_Object Qchoose_write_coding_system;
Lisp_Object Qwrite_region;
static Lisp_Object Qverify_visited_file_modtime;
static Lisp_Object Qset_visited_file_modtime;
strcat (res, "/");
beg = res;
p = beg + strlen (beg);
+ dostounix_filename (beg);
+ tem_fn = make_specified_string (beg, -1, p - beg,
+ STRING_MULTIBYTE (filename));
}
+ else
+ tem_fn = make_specified_string (beg - 2, -1, p - beg + 2,
+ STRING_MULTIBYTE (filename));
+ }
+ else if (STRING_MULTIBYTE (filename))
+ {
+ tem_fn = ENCODE_FILE (make_specified_string (beg, -1, p - beg, 1));
+ dostounix_filename (SSDATA (tem_fn));
+ tem_fn = DECODE_FILE (tem_fn);
+ }
+ else
+ {
+ dostounix_filename (beg);
+ tem_fn = make_specified_string (beg, -1, p - beg, 0);
}
- tem_fn = ENCODE_FILE (make_specified_string (beg, -1, p - beg,
- STRING_MULTIBYTE (filename)));
- dostounix_filename (SSDATA (tem_fn));
- return DECODE_FILE (tem_fn);
+ return tem_fn;
#else /* DOS_NT */
return make_specified_string (beg, -1, p - beg, STRING_MULTIBYTE (filename));
#endif /* DOS_NT */
return Ffile_name_directory (filename);
}
-/* Convert from file name SRC of length SRCLEN to directory name
- in DST. On UNIX, just make sure there is a terminating /.
- Return the length of DST in bytes. */
+/* Convert from file name SRC of length SRCLEN to directory name in
+ DST. MULTIBYTE non-zero means the file name in SRC is a multibyte
+ string. On UNIX, just make sure there is a terminating /. Return
+ the length of DST in bytes. */
static ptrdiff_t
-file_name_as_directory (char *dst, const char *src, ptrdiff_t srclen)
+file_name_as_directory (char *dst, const char *src, ptrdiff_t srclen,
+ bool multibyte)
{
if (srclen == 0)
{
srclen++;
}
#ifdef DOS_NT
- {
- Lisp_Object tem_fn = make_specified_string (dst, -1, srclen, 1);
+ if (multibyte)
+ {
+ Lisp_Object tem_fn = make_specified_string (dst, -1, srclen, 1);
- tem_fn = ENCODE_FILE (tem_fn);
- dostounix_filename (SSDATA (tem_fn));
- tem_fn = DECODE_FILE (tem_fn);
- memcpy (dst, SSDATA (tem_fn), (srclen = SBYTES (tem_fn)) + 1);
- }
+ tem_fn = ENCODE_FILE (tem_fn);
+ dostounix_filename (SSDATA (tem_fn));
+ tem_fn = DECODE_FILE (tem_fn);
+ memcpy (dst, SSDATA (tem_fn), (srclen = SBYTES (tem_fn)) + 1);
+ }
+ else
+ dostounix_filename (dst);
#endif
return srclen;
}
}
buf = alloca (SBYTES (file) + 10);
- length = file_name_as_directory (buf, SSDATA (file), SBYTES (file));
+ length = file_name_as_directory (buf, SSDATA (file), SBYTES (file),
+ STRING_MULTIBYTE (file));
return make_specified_string (buf, -1, length, STRING_MULTIBYTE (file));
}
\f
-/* Convert from directory name SRC of length SRCLEN to
- file name in DST. On UNIX, just make sure there isn't
- a terminating /. Return the length of DST in bytes. */
+/* Convert from directory name SRC of length SRCLEN to file name in
+ DST. MULTIBYTE non-zero means the file name in SRC is a multibyte
+ string. On UNIX, just make sure there isn't a terminating /.
+ Return the length of DST in bytes. */
static ptrdiff_t
-directory_file_name (char *dst, char *src, ptrdiff_t srclen)
+directory_file_name (char *dst, char *src, ptrdiff_t srclen, bool multibyte)
{
/* Process as Unix format: just remove any final slash.
But leave "/" unchanged; do not change it to "". */
srclen--;
}
#ifdef DOS_NT
- {
- Lisp_Object tem_fn = make_specified_string (dst, -1, srclen, 1);
+ if (multibyte)
+ {
+ Lisp_Object tem_fn = make_specified_string (dst, -1, srclen, 1);
- tem_fn = ENCODE_FILE (tem_fn);
- dostounix_filename (SSDATA (tem_fn));
- tem_fn = DECODE_FILE (tem_fn);
- memcpy (dst, SSDATA (tem_fn), (srclen = SBYTES (tem_fn)) + 1);
- }
+ tem_fn = ENCODE_FILE (tem_fn);
+ dostounix_filename (SSDATA (tem_fn));
+ tem_fn = DECODE_FILE (tem_fn);
+ memcpy (dst, SSDATA (tem_fn), (srclen = SBYTES (tem_fn)) + 1);
+ }
+ else
+ dostounix_filename (dst);
#endif
return srclen;
}
}
buf = alloca (SBYTES (directory) + 20);
- length = directory_file_name (buf, SSDATA (directory), SBYTES (directory));
+ length = directory_file_name (buf, SSDATA (directory), SBYTES (directory),
+ STRING_MULTIBYTE (directory));
return make_specified_string (buf, -1, length, STRING_MULTIBYTE (directory));
}
/* `egetenv' may return a unibyte string, which will bite us since
we expect the directory to be multibyte. */
tem = build_string (newdir);
- if (!STRING_MULTIBYTE (tem))
+ if (multibyte && !STRING_MULTIBYTE (tem))
{
hdir = DECODE_FILE (tem);
newdir = SSDATA (hdir);
unblock_input ();
if (pw)
{
+ Lisp_Object tem;
+
newdir = pw->pw_dir;
+ /* `getpwnam' may return a unibyte string, which will
+ bite us since we expect the directory to be
+ multibyte. */
+ tem = build_string (newdir);
+ if (multibyte && !STRING_MULTIBYTE (tem))
+ {
+ hdir = DECODE_FILE (tem);
+ newdir = SSDATA (hdir);
+ }
nm = p;
#ifdef DOS_NT
collapse_newdir = 0;
adir = alloca (MAXPATHLEN + 1);
if (!getdefdir (c_toupper (drive) - 'A' + 1, adir))
adir = NULL;
+ else if (multibyte)
+ {
+ Lisp_Object tem = build_string (adir);
+
+ tem = DECODE_FILE (tem);
+ memcpy (adir, SSDATA (tem), SBYTES (tem) + 1);
+ }
}
if (!adir)
{
indirectly by prepending newdir to nm if necessary, and using
cwd (or the wd of newdir's drive) as the new newdir. */
char *adir;
+
if (IS_DRIVE (newdir[0]) && IS_DEVICE_SEP (newdir[1]))
{
drive = (unsigned char) newdir[0];
{
ptrdiff_t newlen = strlen (newdir);
char *tmp = alloca (newlen + strlen (nm) + 2);
- file_name_as_directory (tmp, newdir, newlen);
+ file_name_as_directory (tmp, newdir, newlen, multibyte);
strcat (tmp, nm);
nm = tmp;
}
if (drive)
{
if (!getdefdir (c_toupper (drive) - 'A' + 1, adir))
- newdir = "/";
+ strcpy (adir, "/");
}
else
getcwd (adir, MAXPATHLEN + 1);
+ if (multibyte)
+ {
+ Lisp_Object tem = build_string (adir);
+
+ tem = DECODE_FILE (tem);
+ memcpy (adir, SSDATA (tem), SBYTES (tem) + 1);
+ }
newdir = adir;
}
strcpy (target, newdir);
}
else
- file_name_as_directory (target, newdir, length);
+ file_name_as_directory (target, newdir, length, multibyte);
}
strcat (target, nm);
target[1] = ':';
}
result = make_specified_string (target, -1, o - target, multibyte);
- result = ENCODE_FILE (result);
- dostounix_filename (SSDATA (result));
- result = DECODE_FILE (result);
+ if (multibyte)
+ {
+ result = ENCODE_FILE (result);
+ dostounix_filename (SSDATA (result));
+ result = DECODE_FILE (result);
+ }
+ else
+ dostounix_filename (SSDATA (result));
#else /* !DOS_NT */
result = make_specified_string (target, -1, o - target, multibyte);
#endif /* !DOS_NT */
memcpy (nm, SDATA (filename), SBYTES (filename) + 1);
#ifdef DOS_NT
- {
- Lisp_Object encoded_filename = ENCODE_FILE (filename);
- Lisp_Object tem_fn;
-
- dostounix_filename (SDATA (encoded_filename));
- tem_fn = DECODE_FILE (encoded_filename);
- nm = alloca (SBYTES (tem_fn) + 1);
- memcpy (nm, SDATA (tem_fn), SBYTES (tem_fn) + 1);
- substituted = (memcmp (nm, SDATA (filename), SBYTES (filename)) != 0);
- if (substituted)
- filename = tem_fn;
- }
+ if (multibyte)
+ {
+ Lisp_Object encoded_filename = ENCODE_FILE (filename);
+ Lisp_Object tem_fn;
+
+ dostounix_filename (SDATA (encoded_filename));
+ tem_fn = DECODE_FILE (encoded_filename);
+ nm = alloca (SBYTES (tem_fn) + 1);
+ memcpy (nm, SDATA (tem_fn), SBYTES (tem_fn) + 1);
+ substituted = (memcmp (nm, SDATA (filename), SBYTES (filename)) != 0);
+ if (substituted)
+ filename = tem_fn;
+ }
+ else
+ {
+ dostounix_filename (nm);
+ substituted = (memcmp (nm, SDATA (filename), SBYTES (filename)) != 0);
+ }
#endif
endp = nm + SBYTES (filename);
If PRESERVE-UID-GID is non-nil, we try to transfer the
uid and gid of FILE to NEWNAME.
-If PRESERVE-SELINUX-CONTEXT is non-nil and SELinux is enabled
-on the system, we copy the SELinux context of FILE to NEWNAME. */)
- (Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists, Lisp_Object keep_time, Lisp_Object preserve_uid_gid, Lisp_Object preserve_selinux_context)
+If PRESERVE-EXTENDED-ATTRIBUTES is non-nil, we try to copy additional
+attributes of FILE to NEWNAME, such as its SELinux context and ACL
+entries (depending on how Emacs was built). */)
+ (Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists, Lisp_Object keep_time, Lisp_Object preserve_uid_gid, Lisp_Object preserve_extended_attributes)
{
int ifd, ofd;
int n;
security_context_t con;
int conlength = 0;
#endif
+#ifdef HAVE_POSIX_ACL
+ acl_t acl = NULL;
+#endif
encoded_file = encoded_newname = Qnil;
GCPRO4 (file, newname, encoded_file, encoded_newname);
if (!NILP (handler))
RETURN_UNGCPRO (call7 (handler, Qcopy_file, file, newname,
ok_if_already_exists, keep_time, preserve_uid_gid,
- preserve_selinux_context));
+ preserve_extended_attributes));
encoded_file = ENCODE_FILE (file);
encoded_newname = ENCODE_FILE (newname);
out_st.st_mode = 0;
#ifdef WINDOWSNT
+ if (!NILP (preserve_extended_attributes))
+ {
+#ifdef HAVE_POSIX_ACL
+ acl = acl_get_file (SDATA (encoded_file), ACL_TYPE_ACCESS);
+ if (acl == NULL && errno != ENOTSUP)
+ report_file_error ("Getting ACL", Fcons (file, Qnil));
+#endif
+ }
if (!CopyFile (SDATA (encoded_file),
SDATA (encoded_newname),
FALSE))
- report_file_error ("Copying file", Fcons (file, Fcons (newname, Qnil)));
+ {
+ /* CopyFile doesn't set errno when it fails. By far the most
+ "popular" reason is that the target is read-only. */
+ if (GetLastError () == 5)
+ errno = EACCES;
+ else
+ errno = EPERM;
+ report_file_error ("Copying file", Fcons (file, Fcons (newname, Qnil)));
+ }
/* CopyFile retains the timestamp by default. */
else if (NILP (keep_time))
{
/* Restore original attributes. */
SetFileAttributes (filename, attributes);
}
+#ifdef HAVE_POSIX_ACL
+ if (acl != NULL)
+ {
+ bool fail =
+ acl_set_file (SDATA (encoded_newname), ACL_TYPE_ACCESS, acl) != 0;
+ if (fail && errno != ENOTSUP)
+ report_file_error ("Setting ACL", Fcons (newname, Qnil));
+
+ acl_free (acl);
+ }
+#endif
#else /* not WINDOWSNT */
immediate_quit = 1;
ifd = emacs_open (SSDATA (encoded_file), O_RDONLY, 0);
if (fstat (ifd, &st) != 0)
report_file_error ("Input file status", Fcons (file, Qnil));
-#if HAVE_LIBSELINUX
- if (!NILP (preserve_selinux_context) && is_selinux_enabled ())
+ if (!NILP (preserve_extended_attributes))
{
- conlength = fgetfilecon (ifd, &con);
- if (conlength == -1)
- report_file_error ("Doing fgetfilecon", Fcons (file, Qnil));
- }
+#if HAVE_LIBSELINUX
+ if (is_selinux_enabled ())
+ {
+ conlength = fgetfilecon (ifd, &con);
+ if (conlength == -1)
+ report_file_error ("Doing fgetfilecon", Fcons (file, Qnil));
+ }
+#endif
+
+#ifdef HAVE_POSIX_ACL
+ acl = acl_get_fd (ifd);
+ if (acl == NULL && errno != ENOTSUP)
+ report_file_error ("Getting ACL", Fcons (file, Qnil));
#endif
+ }
if (out_st.st_mode != 0
&& st.st_dev == out_st.st_dev && st.st_ino == out_st.st_ino)
}
#endif
+#ifdef HAVE_POSIX_ACL
+ if (acl != NULL)
+ {
+ bool fail = acl_set_fd (ofd, acl) != 0;
+ if (fail && errno != ENOTSUP)
+ report_file_error ("Setting ACL", Fcons (newname, Qnil));
+
+ acl_free (acl);
+ }
+#endif
+
if (!NILP (keep_time))
{
EMACS_TIME atime = get_stat_atime (&st);
return Qt;
}
-/* Delete file FILENAME.
+/* Delete file FILENAME, returning true if successful.
This ignores `delete-by-moving-to-trash'. */
-void
+bool
internal_delete_file (Lisp_Object filename)
{
- internal_condition_case_2 (Fdelete_file, filename, Qnil,
- Qt, internal_delete_file_1);
+ Lisp_Object tem;
+
+ tem = internal_condition_case_2 (Fdelete_file, filename, Qnil,
+ Qt, internal_delete_file_1);
+ return NILP (tem);
}
\f
DEFUN ("rename-file", Frename_file, Srename_file, 2, 3,
return Qnil;
}
\f
+/* Relative to directory FD, return the symbolic link value of FILENAME.
+ On failure, return nil. */
+Lisp_Object
+emacs_readlinkat (int fd, char const *filename)
+{
+ static struct allocator const emacs_norealloc_allocator =
+ { xmalloc, NULL, xfree, memory_full };
+ Lisp_Object val;
+ char readlink_buf[1024];
+ char *buf = careadlinkat (fd, filename, readlink_buf, sizeof readlink_buf,
+ &emacs_norealloc_allocator, readlinkat);
+ if (!buf)
+ return Qnil;
+
+ val = build_string (buf);
+ if (buf[0] == '/' && strchr (buf, ':'))
+ val = concat2 (build_string ("/:"), val);
+ if (buf != readlink_buf)
+ xfree (buf);
+ val = DECODE_FILE (val);
+ return val;
+}
+
DEFUN ("file-symlink-p", Ffile_symlink_p, Sfile_symlink_p, 1, 1, 0,
doc: /* Return non-nil if file FILENAME is the name of a symbolic link.
The value is the link target, as a string.
(Lisp_Object filename)
{
Lisp_Object handler;
- char *buf;
- Lisp_Object val;
- char readlink_buf[READLINK_BUFSIZE];
CHECK_STRING (filename);
filename = Fexpand_file_name (filename, Qnil);
filename = ENCODE_FILE (filename);
- buf = emacs_readlink (SSDATA (filename), readlink_buf);
- if (! buf)
- return Qnil;
-
- val = build_string (buf);
- if (buf[0] == '/' && strchr (buf, ':'))
- val = concat2 (build_string ("/:"), val);
- if (buf != readlink_buf)
- xfree (buf);
- val = DECODE_FILE (val);
- return val;
+ return emacs_readlinkat (AT_FDCWD, SSDATA (filename));
}
DEFUN ("file-directory-p", Ffile_directory_p, Sfile_directory_p, 1, 1, 0,
CONTEXT should be a list (USER ROLE TYPE RANGE), where the list
elements are strings naming the components of a SELinux context.
-This function does nothing if SELinux is disabled, or if Emacs was not
-compiled with SELinux support. */)
+Value is t if setting of SELinux context was successful, nil otherwise.
+
+This function does nothing and returns nil if SELinux is disabled,
+or if Emacs was not compiled with SELinux support. */)
(Lisp_Object filename, Lisp_Object context)
{
Lisp_Object absname;
context_free (parsed_con);
freecon (con);
+ return fail ? Qnil : Qt;
}
else
report_file_error ("Doing lgetfilecon", Fcons (absname, Qnil));
return Qnil;
}
\f
+DEFUN ("file-acl", Ffile_acl, Sfile_acl, 1, 1, 0,
+ doc: /* Return ACL entries of file named FILENAME.
+The entries are returned in a format suitable for use in `set-file-acl'
+but is otherwise undocumented and subject to change.
+Return nil if file does not exist or is not accessible, or if Emacs
+was unable to determine the ACL entries. */)
+ (Lisp_Object filename)
+{
+ Lisp_Object absname;
+ Lisp_Object handler;
+#ifdef HAVE_POSIX_ACL
+ acl_t acl;
+ Lisp_Object acl_string;
+ char *str;
+#endif
+
+ absname = expand_and_dir_to_file (filename,
+ BVAR (current_buffer, directory));
+
+ /* If the file name has special constructs in it,
+ call the corresponding file handler. */
+ handler = Ffind_file_name_handler (absname, Qfile_acl);
+ if (!NILP (handler))
+ return call2 (handler, Qfile_acl, absname);
+
+#ifdef HAVE_POSIX_ACL
+ absname = ENCODE_FILE (absname);
+
+ acl = acl_get_file (SSDATA (absname), ACL_TYPE_ACCESS);
+ if (acl == NULL)
+ return Qnil;
+
+ str = acl_to_text (acl, NULL);
+ if (str == NULL)
+ {
+ acl_free (acl);
+ return Qnil;
+ }
+
+ acl_string = build_string (str);
+ acl_free (str);
+ acl_free (acl);
+
+ return acl_string;
+#endif
+
+ return Qnil;
+}
+
+DEFUN ("set-file-acl", Fset_file_acl, Sset_file_acl,
+ 2, 2, 0,
+ doc: /* Set ACL of file named FILENAME to ACL-STRING.
+ACL-STRING should contain the textual representation of the ACL
+entries in a format suitable for the platform.
+
+Value is t if setting of ACL was successful, nil otherwise.
+
+Setting ACL for local files requires Emacs to be built with ACL
+support. */)
+ (Lisp_Object filename, Lisp_Object acl_string)
+{
+ Lisp_Object absname;
+ Lisp_Object handler;
+#ifdef HAVE_POSIX_ACL
+ Lisp_Object encoded_absname;
+ acl_t acl;
+ bool fail;
+#endif
+
+ absname = Fexpand_file_name (filename, BVAR (current_buffer, directory));
+
+ /* If the file name has special constructs in it,
+ call the corresponding file handler. */
+ handler = Ffind_file_name_handler (absname, Qset_file_acl);
+ if (!NILP (handler))
+ return call3 (handler, Qset_file_acl, absname, acl_string);
+
+#ifdef HAVE_POSIX_ACL
+ if (STRINGP (acl_string))
+ {
+ acl = acl_from_text (SSDATA (acl_string));
+ if (acl == NULL)
+ {
+ report_file_error ("Converting ACL", Fcons (absname, Qnil));
+ return Qnil;
+ }
+
+ encoded_absname = ENCODE_FILE (absname);
+
+ fail = (acl_set_file (SSDATA (encoded_absname), ACL_TYPE_ACCESS,
+ acl)
+ != 0);
+ if (fail && errno != ENOTSUP)
+ report_file_error ("Setting ACL", Fcons (absname, Qnil));
+
+ acl_free (acl);
+ return fail ? Qnil : Qt;
+ }
+#endif
+
+ return Qnil;
+}
+\f
DEFUN ("file-modes", Ffile_modes, Sfile_modes, 1, 1, 0,
doc: /* Return mode bits of file named FILENAME, as an integer.
Return nil, if file does not exist or is not accessible. */)
return Qnil;
}
-
-/* Used to pass values from insert-file-contents to read_non_regular. */
-
-static int non_regular_fd;
-static ptrdiff_t non_regular_inserted;
-static int non_regular_nbytes;
-
-
-/* Read from a non-regular file.
- Read non_regular_nbytes bytes max from non_regular_fd.
- Non_regular_inserted specifies where to put the read bytes.
- Value is the number of bytes read. */
+/* Read from a non-regular file. STATE is a Lisp_Save_Value
+ object where slot 0 is the file descriptor, slot 1 specifies
+ an offset to put the read bytes, and slot 2 is the maximum
+ amount of bytes to read. Value is the number of bytes read. */
static Lisp_Object
-read_non_regular (Lisp_Object ignore)
+read_non_regular (Lisp_Object state)
{
int nbytes;
immediate_quit = 1;
QUIT;
- nbytes = emacs_read (non_regular_fd,
+ nbytes = emacs_read (XSAVE_INTEGER (state, 0),
((char *) BEG_ADDR + PT_BYTE - BEG_BYTE
- + non_regular_inserted),
- non_regular_nbytes);
+ + XSAVE_INTEGER (state, 1)),
+ XSAVE_INTEGER (state, 2));
immediate_quit = 0;
+ /* Fast recycle this object for the likely next call. */
+ free_misc (state);
return make_number (nbytes);
}
return Qnil;
}
-/* Reposition FD to OFFSET, based on WHENCE. This acts like lseek
- except that it also tests for OFFSET being out of lseek's range. */
+/* Return the file offset that VAL represents, checking for type
+ errors and overflow. */
static off_t
-emacs_lseek (int fd, EMACS_INT offset, int whence)
+file_offset (Lisp_Object val)
{
- /* Use "&" rather than "&&" to suppress a bogus GCC warning; see
- <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43772>. */
- if (! ((offset >= TYPE_MINIMUM (off_t)) & (offset <= TYPE_MAXIMUM (off_t))))
+ if (RANGED_INTEGERP (0, val, TYPE_MAXIMUM (off_t)))
+ return XINT (val);
+
+ if (FLOATP (val))
{
- errno = EINVAL;
- return -1;
+ double v = XFLOAT_DATA (val);
+ if (0 <= v
+ && (sizeof (off_t) < sizeof v
+ ? v <= TYPE_MAXIMUM (off_t)
+ : v < TYPE_MAXIMUM (off_t)))
+ return v;
}
- return lseek (fd, offset, whence);
+
+ wrong_type_argument (intern ("file-offset"), val);
}
/* Return a special time value indicating the error number ERRNUM. */
This function does code conversion according to the value of
`coding-system-for-read' or `file-coding-system-alist', and sets the
-variable `last-coding-system-used' to the coding system actually used. */)
+variable `last-coding-system-used' to the coding system actually used.
+
+In addition, this function decodes the inserted text from known formats
+by calling `format-decode', which see. */)
(Lisp_Object filename, Lisp_Object visit, Lisp_Object beg, Lisp_Object end, Lisp_Object replace)
{
struct stat st;
- int file_status;
EMACS_TIME mtime;
int fd;
ptrdiff_t inserted = 0;
int save_errno = 0;
char read_buf[READ_BUF_SIZE];
struct coding_system coding;
- char buffer[1 << 14];
bool replace_handled = 0;
bool set_coding_system = 0;
Lisp_Object coding_system;
orig_filename = filename;
filename = ENCODE_FILE (filename);
- fd = -1;
-
-#ifdef WINDOWSNT
- {
- Lisp_Object tem = Vw32_get_true_file_attributes;
-
- /* Tell stat to use expensive method to get accurate info. */
- Vw32_get_true_file_attributes = Qt;
- file_status = stat (SSDATA (filename), &st);
- Vw32_get_true_file_attributes = tem;
- }
-#else
- file_status = stat (SSDATA (filename), &st);
-#endif /* WINDOWSNT */
-
- if (file_status == 0)
- mtime = get_stat_mtime (&st);
- else
+ fd = emacs_open (SSDATA (filename), O_RDONLY, 0);
+ if (fd < 0)
{
- badopen:
save_errno = errno;
if (NILP (visit))
report_file_error ("Opening input file", Fcons (orig_filename, Qnil));
mtime = time_error_value (save_errno);
st.st_size = -1;
- how_much = 0;
if (!NILP (Vcoding_system_for_read))
Fset (Qbuffer_file_coding_system, Vcoding_system_for_read);
goto notfound;
}
+ /* Replacement should preserve point as it preserves markers. */
+ if (!NILP (replace))
+ record_unwind_protect (restore_point_unwind, Fpoint_marker ());
+
+ record_unwind_protect (close_file_unwind, make_number (fd));
+
+ if (fstat (fd, &st) != 0)
+ report_file_error ("Input file status", Fcons (orig_filename, Qnil));
+ mtime = get_stat_mtime (&st);
+
/* This code will need to be changed in order to work on named
pipes, and it's probably just not worth it. So we should at
least signal an error. */
build_string ("not a regular file"), orig_filename);
}
- if (fd < 0)
- if ((fd = emacs_open (SSDATA (filename), O_RDONLY, 0)) < 0)
- goto badopen;
-
- /* Replacement should preserve point as it preserves markers. */
- if (!NILP (replace))
- record_unwind_protect (restore_point_unwind, Fpoint_marker ());
-
- record_unwind_protect (close_file_unwind, make_number (fd));
-
-
if (!NILP (visit))
{
if (!NILP (beg) || !NILP (end))
}
if (!NILP (beg))
- {
- if (! RANGED_INTEGERP (0, beg, TYPE_MAXIMUM (off_t)))
- wrong_type_argument (intern ("file-offset"), beg);
- beg_offset = XFASTINT (beg);
- }
+ beg_offset = file_offset (beg);
else
beg_offset = 0;
if (!NILP (end))
- {
- if (! RANGED_INTEGERP (0, end, TYPE_MAXIMUM (off_t)))
- wrong_type_argument (intern ("file-offset"), end);
- end_offset = XFASTINT (end);
- }
+ end_offset = file_offset (end);
else
{
if (not_regular)
else
{
nread = emacs_read (fd, read_buf, 1024);
- if (nread >= 0)
+ if (nread == 1024)
{
- if (lseek (fd, st.st_size - (1024 * 3), SEEK_SET) < 0)
+ int ntail;
+ if (lseek (fd, - (1024 * 3), SEEK_END) < 0)
report_file_error ("Setting file position",
Fcons (orig_filename, Qnil));
- nread += emacs_read (fd, read_buf + nread, 1024 * 3);
+ ntail = emacs_read (fd, read_buf + nread, 1024 * 3);
+ nread = ntail < 0 ? ntail : nread + ntail;
}
}
{
int nread, bufpos;
- nread = emacs_read (fd, buffer, sizeof buffer);
+ nread = emacs_read (fd, read_buf, sizeof read_buf);
if (nread < 0)
error ("IO error reading %s: %s",
SSDATA (orig_filename), emacs_strerror (errno));
if (CODING_REQUIRE_DETECTION (&coding))
{
- coding_system = detect_coding_system ((unsigned char *) buffer,
+ coding_system = detect_coding_system ((unsigned char *) read_buf,
nread, nread, 1, 0,
coding_system);
setup_coding_system (coding_system, &coding);
bufpos = 0;
while (bufpos < nread && same_at_start < ZV_BYTE
- && FETCH_BYTE (same_at_start) == buffer[bufpos])
+ && FETCH_BYTE (same_at_start) == read_buf[bufpos])
same_at_start++, bufpos++;
/* If we found a discrepancy, stop the scan.
Otherwise loop around and scan the next bufferful. */
if (curpos == 0)
break;
/* How much can we scan in the next step? */
- trial = min (curpos, sizeof buffer);
+ trial = min (curpos, sizeof read_buf);
if (lseek (fd, curpos - trial, SEEK_SET) < 0)
report_file_error ("Setting file position",
Fcons (orig_filename, Qnil));
total_read = nread = 0;
while (total_read < trial)
{
- nread = emacs_read (fd, buffer + total_read, trial - total_read);
+ nread = emacs_read (fd, read_buf + total_read, trial - total_read);
if (nread < 0)
error ("IO error reading %s: %s",
SDATA (orig_filename), emacs_strerror (errno));
/* Compare with same_at_start to avoid counting some buffer text
as matching both at the file's beginning and at the end. */
while (bufpos > 0 && same_at_end > same_at_start
- && FETCH_BYTE (same_at_end - 1) == buffer[bufpos - 1])
+ && FETCH_BYTE (same_at_end - 1) == read_buf[bufpos - 1])
same_at_end--, bufpos--;
/* If we found a discrepancy, stop the scan.
report_file_error ("Setting file position",
Fcons (orig_filename, Qnil));
- total = st.st_size; /* Total bytes in the file. */
- how_much = 0; /* Bytes read from file so far. */
inserted = 0; /* Bytes put into CONVERSION_BUFFER so far. */
unprocessed = 0; /* Bytes not processed in previous loop. */
GCPRO1 (conversion_buffer);
- while (how_much < total)
+ while (1)
{
- /* We read one bunch by one (READ_BUF_SIZE bytes) to allow
- quitting while reading a huge while. */
- /* `try'' is reserved in some compilers (Microsoft C). */
- int trytry = min (total - how_much, READ_BUF_SIZE - unprocessed);
+ /* Read at most READ_BUF_SIZE bytes at a time, to allow
+ quitting while reading a huge file. */
/* Allow quitting out of the actual I/O. */
immediate_quit = 1;
QUIT;
- this = emacs_read (fd, read_buf + unprocessed, trytry);
+ this = emacs_read (fd, read_buf + unprocessed,
+ READ_BUF_SIZE - unprocessed);
immediate_quit = 0;
if (this <= 0)
break;
- how_much += this;
-
BUF_TEMP_SET_PT (XBUFFER (conversion_buffer),
BUF_Z (XBUFFER (conversion_buffer)));
decode_coding_c_string (&coding, (unsigned char *) read_buf,
so defer the removal till we reach the `handled' label. */
deferred_remove_unwind_protect = 1;
- /* At this point, HOW_MUCH should equal TOTAL, or should be <= 0
- if we couldn't read the file. */
-
if (this < 0)
error ("IO error reading %s: %s",
SDATA (orig_filename), emacs_strerror (errno));
prepare_to_modify_buffer (GPT, GPT, NULL);
}
- move_gap (PT);
+ move_gap_both (PT, PT_BYTE);
if (GAP_SIZE < total)
make_gap (total - GAP_SIZE);
while (how_much < total)
{
/* try is reserved in some compilers (Microsoft C) */
- int trytry = min (total - how_much, READ_BUF_SIZE);
+ ptrdiff_t trytry = min (total - how_much, READ_BUF_SIZE);
ptrdiff_t this;
if (not_regular)
/* Maybe make more room. */
if (gap_size < trytry)
{
- make_gap (total - gap_size);
- gap_size = GAP_SIZE;
+ make_gap (trytry - gap_size);
+ gap_size = GAP_SIZE - inserted;
}
/* Read from the file, capturing `quit'. When an
error occurs, end the loop, and arrange for a quit
to be signaled after decoding the text we read. */
- non_regular_fd = fd;
- non_regular_inserted = inserted;
- non_regular_nbytes = trytry;
- nbytes = internal_condition_case_1 (read_non_regular,
- Qnil, Qerror,
- read_non_regular_quit);
+ nbytes = internal_condition_case_1
+ (read_non_regular,
+ make_save_value ("iii", (ptrdiff_t) fd, inserted, trytry),
+ Qerror, read_non_regular_quit);
+
if (NILP (nbytes))
{
read_quit = 1;
}
}
- /* Now we have read all the file data into the gap.
- If it was empty, undo marking the buffer modified. */
+ /* Now we have either read all the file data into the gap,
+ or stop reading on I/O error or quit. If nothing was
+ read, undo marking the buffer modified. */
if (inserted == 0)
{
else
Vdeactivate_mark = Qt;
+ emacs_close (fd);
+
+ /* Discard the unwind protect for closing the file. */
+ specpdl_ptr--;
+
+ if (how_much < 0)
+ error ("IO error reading %s: %s",
+ SDATA (orig_filename), emacs_strerror (errno));
+
/* Make the text read part of the buffer. */
GAP_SIZE -= inserted;
GPT += inserted;
/* Put an anchor to ensure multi-byte form ends at gap. */
*GPT_ADDR = 0;
- emacs_close (fd);
-
- /* Discard the unwind protect for closing the file. */
- specpdl_ptr--;
-
- if (how_much < 0)
- error ("IO error reading %s: %s",
- SDATA (orig_filename), emacs_strerror (errno));
-
notfound:
if (NILP (coding_system))
if (read_quit)
Fsignal (Qquit, Qnil);
- /* ??? Retval needs to be dealt with in all cases consistently. */
+ /* Retval needs to be dealt with in all cases consistently. */
if (NILP (val))
- val = Fcons (orig_filename,
- Fcons (make_number (inserted),
- Qnil));
+ val = list2 (orig_filename, make_number (inserted));
RETURN_UNGCPRO (unbind_to (count, val));
}
/* Decide the coding-system to encode the data with. */
-static Lisp_Object
-choose_write_coding_system (Lisp_Object start, Lisp_Object end, Lisp_Object filename,
- Lisp_Object append, Lisp_Object visit, Lisp_Object lockname,
- struct coding_system *coding)
+DEFUN ("choose-write-coding-system", Fchoose_write_coding_system,
+ Schoose_write_coding_system, 3, 6, 0,
+ doc: /* Choose the coding system for writing a file.
+Arguments are as for `write-region'.
+This function is for internal use only. It may prompt the user. */ )
+ (Lisp_Object start, Lisp_Object end, Lisp_Object filename,
+ Lisp_Object append, Lisp_Object visit, Lisp_Object lockname)
{
Lisp_Object val;
Lisp_Object eol_parent = Qnil;
+ /* Mimic write-region behavior. */
+ if (NILP (start))
+ {
+ XSETFASTINT (start, BEGV);
+ XSETFASTINT (end, ZV);
+ }
+
if (auto_saving
&& NILP (Fstring_equal (BVAR (current_buffer, filename),
BVAR (current_buffer, auto_save_file_name))))
}
val = coding_inherit_eol_type (val, eol_parent);
- setup_coding_system (val, coding);
-
- if (!STRINGP (start) && !NILP (BVAR (current_buffer, selective_display)))
- coding->mode |= CODING_MODE_SELECTIVE_DISPLAY;
return val;
}
instead of any buffer contents; END is ignored.
Optional fourth argument APPEND if non-nil means
- append to existing file contents (if any). If it is an integer,
+ append to existing file contents (if any). If it is a number,
seek to that offset in the file before writing.
Optional fifth argument VISIT, if t or a string, means
set the last-save-file-modtime of buffer to this file's modtime
(Lisp_Object start, Lisp_Object end, Lisp_Object filename, Lisp_Object append, Lisp_Object visit, Lisp_Object lockname, Lisp_Object mustbenew)
{
int desc;
+ int open_flags;
+ int mode;
+ off_t offset IF_LINT (= 0);
bool ok;
int save_errno = 0;
const char *fn;
We used to make this choice before calling build_annotations, but that
leads to problems when a write-annotate-function takes care of
unsavable chars (as was the case with X-Symbol). */
- Vlast_coding_system_used
- = choose_write_coding_system (start, end, filename,
- append, visit, lockname, &coding);
+ Vlast_coding_system_used =
+ Fchoose_write_coding_system (start, end, filename,
+ append, visit, lockname);
+
+ setup_coding_system (Vlast_coding_system_used, &coding);
+
+ if (!STRINGP (start) && !NILP (BVAR (current_buffer, selective_display)))
+ coding.mode |= CODING_MODE_SELECTIVE_DISPLAY;
#ifdef CLASH_DETECTION
if (!auto_saving)
#endif /* CLASH_DETECTION */
encoded_filename = ENCODE_FILE (filename);
-
fn = SSDATA (encoded_filename);
- desc = -1;
- if (!NILP (append))
+ open_flags = O_WRONLY | O_BINARY | O_CREAT;
+ open_flags |= EQ (mustbenew, Qexcl) ? O_EXCL : !NILP (append) ? 0 : O_TRUNC;
+ if (NUMBERP (append))
+ offset = file_offset (append);
+ else if (!NILP (append))
+ open_flags |= O_APPEND;
#ifdef DOS_NT
- desc = emacs_open (fn, O_WRONLY | O_BINARY, 0);
-#else /* not DOS_NT */
- desc = emacs_open (fn, O_WRONLY, 0);
-#endif /* not DOS_NT */
+ mode = S_IREAD | S_IWRITE;
+#else
+ mode = auto_saving ? auto_save_mode_bits : 0666;
+#endif
- if (desc < 0 && (NILP (append) || errno == ENOENT))
-#ifdef DOS_NT
- desc = emacs_open (fn,
- O_WRONLY | O_CREAT | O_BINARY
- | (EQ (mustbenew, Qexcl) ? O_EXCL : O_TRUNC),
- S_IREAD | S_IWRITE);
-#else /* not DOS_NT */
- desc = emacs_open (fn, O_WRONLY | O_TRUNC | O_CREAT
- | (EQ (mustbenew, Qexcl) ? O_EXCL : 0),
- auto_saving ? auto_save_mode_bits : 0666);
-#endif /* not DOS_NT */
+ desc = emacs_open (fn, open_flags, mode);
if (desc < 0)
{
record_unwind_protect (close_file_unwind, make_number (desc));
- if (!NILP (append) && !NILP (Ffile_regular_p (filename)))
+ if (NUMBERP (append))
{
- off_t ret;
-
- if (NUMBERP (append))
- ret = emacs_lseek (desc, XINT (append), SEEK_CUR);
- else
- ret = lseek (desc, 0, SEEK_END);
+ off_t ret = lseek (desc, offset, SEEK_SET);
if (ret < 0)
{
#ifdef CLASH_DETECTION
/* Discard the unwind protect for close_file_unwind. */
specpdl_ptr = specpdl + count1;
+ /* Some file systems have a bug where st_mtime is not updated
+ properly after a write. For example, CIFS might not see the
+ st_mtime change until after the file is opened again.
+
+ Attempt to detect this file system bug, and update MODTIME to the
+ newer st_mtime if the bug appears to be present. This introduces
+ a race condition, so to avoid most instances of the race condition
+ on non-buggy file systems, skip this check if the most recently
+ encountered non-buggy file system was the current file system.
+
+ A race condition can occur if some other process modifies the
+ file between the fstat above and the fstat below, but the race is
+ unlikely and a similar race between the last write and the fstat
+ above cannot possibly be closed anyway. */
+
+ if (EMACS_TIME_VALID_P (modtime)
+ && ! (valid_timestamp_file_system && st.st_dev == timestamp_file_system))
+ {
+ int desc1 = emacs_open (fn, O_WRONLY | O_BINARY, 0);
+ if (0 <= desc1)
+ {
+ struct stat st1;
+ if (fstat (desc1, &st1) == 0
+ && st.st_dev == st1.st_dev && st.st_ino == st1.st_ino)
+ {
+ EMACS_TIME modtime1 = get_stat_mtime (&st1);
+ /* If neither O_EXCL nor O_TRUNC is used, and Emacs happened to
+ write nothing to the file, the file's time stamp won't change
+ so it should not be used in this heuristic. */
+ if ((open_flags & (O_EXCL | O_TRUNC)) != 0
+ && EMACS_TIME_EQ (modtime, modtime1)
+ && st.st_size == st1.st_size)
+ {
+ timestamp_file_system = st.st_dev;
+ valid_timestamp_file_system = 1;
+ }
+ else
+ {
+ st.st_size = st1.st_size;
+ modtime = modtime1;
+ }
+ }
+ emacs_close (desc1);
+ }
+ }
+
/* Call write-region-post-annotation-function. */
while (CONSP (Vwrite_region_annotation_buffers))
{
}
if (!auto_saving)
- message_with_string ((INTEGERP (append)
+ message_with_string ((NUMBERP (append)
? "Updated %s"
: ! NILP (append)
? "Added to %s"
auto_save_error (Lisp_Object error_val)
{
Lisp_Object args[3], msg;
- int i, nbytes;
+ int i;
struct gcpro gcpro1;
- char *msgbuf;
- USE_SAFE_ALLOCA;
auto_save_error_occurred = 1;
args[2] = Ferror_message_string (error_val);
msg = Fformat (3, args);
GCPRO1 (msg);
- nbytes = SBYTES (msg);
- msgbuf = SAFE_ALLOCA (nbytes);
- memcpy (msgbuf, SDATA (msg), nbytes);
for (i = 0; i < 3; ++i)
{
if (i == 0)
- message2 (msgbuf, nbytes, STRING_MULTIBYTE (msg));
+ message3 (msg);
else
- message2_nolog (msgbuf, nbytes, STRING_MULTIBYTE (msg));
+ message3_nolog (msg);
Fsleep_for (make_number (1), Qnil);
}
- SAFE_FREE ();
UNGCPRO;
return Qnil;
}
do_auto_save_unwind (Lisp_Object arg) /* used as unwind-protect function */
{
- FILE *stream = (FILE *) XSAVE_VALUE (arg)->pointer;
+ FILE *stream = XSAVE_POINTER (arg, 0);
auto_saving = 0;
if (stream != NULL)
{
}
record_unwind_protect (do_auto_save_unwind,
- make_save_value (stream, 0));
+ make_save_pointer (stream));
record_unwind_protect (do_auto_save_unwind_1,
make_number (minibuffer_auto_raise));
minibuffer_auto_raise = 0;
}
\f
+void
+init_fileio (void)
+{
+ valid_timestamp_file_system = 0;
+}
+
void
syms_of_fileio (void)
{
DEFSYM (Qset_file_times, "set-file-times");
DEFSYM (Qfile_selinux_context, "file-selinux-context");
DEFSYM (Qset_file_selinux_context, "set-file-selinux-context");
+ DEFSYM (Qfile_acl, "file-acl");
+ DEFSYM (Qset_file_acl, "set-file-acl");
DEFSYM (Qfile_newer_than_file_p, "file-newer-than-file-p");
DEFSYM (Qinsert_file_contents, "insert-file-contents");
+ DEFSYM (Qchoose_write_coding_system, "choose-write-coding-system");
DEFSYM (Qwrite_region, "write-region");
DEFSYM (Qverify_visited_file_modtime, "verify-visited-file-modtime");
DEFSYM (Qset_visited_file_modtime, "set-visited-file-modtime");
defsubr (&Sset_file_modes);
defsubr (&Sset_file_times);
defsubr (&Sfile_selinux_context);
+ defsubr (&Sfile_acl);
+ defsubr (&Sset_file_acl);
defsubr (&Sset_file_selinux_context);
defsubr (&Sset_default_file_modes);
defsubr (&Sdefault_file_modes);
defsubr (&Sfile_newer_than_file_p);
defsubr (&Sinsert_file_contents);
+ defsubr (&Schoose_write_coding_system);
defsubr (&Swrite_region);
defsubr (&Scar_less_than_car);
defsubr (&Sverify_visited_file_modtime);
HCoop / bpt / emacs.git / blobdiff