glibc/libio/fileops.c
Ulrich Drepper c131718ccc Update.
1997-04-09 01:24  Ulrich Drepper  <drepper@cygnus.com>

	* rellns-sh: Rewrite to work also in presence of symlinks.

	* arpg/argp-fmtstream.c: Add casts to prevent warnings.
	* argp/argp-fmtstream.h: Likewise.
	* argp/argp-help.c: Likewise.

	* elf/dl-minimal.c: Add definition of calloc.
	* elf/version.c: Add casts to prevent warnings.
	(_dl_check_map_versions): Use calloc instead of malloc+memset.

	* locale/setlocale.c (_nl_current): Add element with index LC_ALL.
	Reported by Greg McGary <gkm@eng.ascend.com>.

	* manual/libc.texinfo: Update malloc documentation for new malloc.
	* manual/memory.texi: Likewise.
	Patch by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>.

	* math/libm-test.c (check_long): New function.
	(check_longlong): New function.
	(rinttol_test): New function.
	(rinttoll_test): New function.

	* nis/nss_compat/compat-grp.c (in_blacklist): Improve a bit.
	* nis/nss_compat/compat-pwd.c: Likewise.
	* nis/nss_compat/compat-spwd.c: Likewise.

	* stdlib/erand48_r.c (erand48_r): Build double value using
	ieee754_double union and use random bits in different order to
	increase effect of seed.
	Reported by David Mosberger-Tang <davidm@AZStarNet.com>.

	* sunrpc/svc_auth.c: Moved to ...
	* sysdeps/generic/svc_auth.c: ...here.

	* time/time.h: Pretty print.

1997-04-08 07:19  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* libio/genops.c (_IO_flush_all_linebuffered): don't flush on
	a read-only stream.

1997-04-09 01:19  Ulrich Drepper  <drepper@cygnus.com>

	* malloc/malloc.c (mALLOC_STATs) [MALLOC_DEBUG>1]: Put declaration
	in correct place.
	Patch by Marcus G. Daniels <marcus@cathcart.sysc.pdx.edu>.

1997-04-07 15:34  Ulrich Drepper  <drepper@cygnus.com>

	* stdio-common/Makefile (tests): Add tst-ferror.
	* stdio-common/tst-ferror.c: New file.  Some tests for error
	indicator of streams.
	* stdio-common/tst-ferror.input: New file.

	* isomac.c: Let tests not fail because the compiler defines itself
	symbols which violate the name space rules.  gcc defines symbols
	for the architecture which are not protected by an underscore
	character.

	* math/Makefile (libm-support): Add s_rinttol and s_rinttoll.
	(libm-calls): Add s_clog.
	* sysdeps/libm-ieee754/s_clog.c: New file.  Implementation of
	logarithm of complex value.
	* sysdeps/libm-ieee754/s_clogf.c: New file.
	* sysdeps/libm-ieee754/s_clogl.c: New file.
	* math/libm-test.c (clog_test): Compile this function.  Fix a few
	typos.
	(main): Call clog_test.

	* sysdeps/libm-ieee754/s_rinttol.c: New file.  Round long double
	value to long int.
	* sysdeps/libm-i387/s_rinttol.S: New file.
	* sysdeps/libm-ieee754/s_rinttoll.c: new file.  Round long double
	value to long long int.
	* sysdeps/libm-i387/s_rinttoll.S: New file.

	* sysdeps/libm-ieee754/s_rintl.c: Many corrections.  The previous
	version was full of errors.

	* math/math.h (rinttol): Argument is of type `long double' not
	`double'.
	(rinttoll): Likewise.
	(roundtol): Likewise.
	(roundtoll): Likewise.

1997-04-06 11:32  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* posix/getopt.c (_getopt_initialize): Preserve optind.
	(_getopt_internal): Set optind to 1 if optind == 0 before
	calling _getopt_initialize ().

1997-04-05 16:45  Thorsten Kukuk  <kukuk@vt.uni-paderborn.de>

	* nis/rpcsvc/nislib.h: Change const nis_name to new type
	const_nis_name.
	* nis/nis_intern.c: Likewise.
	* nis/nis_intern.h: Likewise.
	* nis/nis_server.c: Likewise.
	* nis/nis_subr.c: Likewise.
	* nis/nis_table.c: Likewise.
	* nis/nis_names.c: Likewise.  Fill out ns_request structure in
	nis_add().

	* nis/nss_compat/compat-pwd.c: Use reentrant netgroup functions.
	* nis/nss_compat/compat-spwd.c: Likewise.

1997-03-27 07:37  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* libio/fileops.c (_IO_file_overflow): Set error when try to write
	on a read-only stream.

	* sysdeps/gnu/utmpbits.h (ut_xtime): New symbol.
	(ut_time): Define it only if _NO_UT_TIME is not defined.

1997-04-06 00:42  Ulrich Drepper  <drepper@cygnus.com>

	* misc/tst-tsearch.c: Include <string.h>.  Define _GNU_SOURCE only
	if not already defined.

1997-04-05 16:14  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/netatalk/at.h: Include <sys/socket.h> to
	get definition of sa_family_t for <linux/atalk.h>.
	Reported by a sun <asun@zoology.washington.edu>.

	* malloc/malloc.c (cALLOc): Little optimization.
1997-04-08 23:42:08 +00:00

784 lines
22 KiB
C

/*
Copyright (C) 1993, 1995 Free Software Foundation
This file is part of the GNU IO Library. This library is free
software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
As a special exception, if you link this library with files
compiled with a GNU compiler to produce an executable, this does not cause
the resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why
the executable file might be covered by the GNU General Public License. */
/* written by Per Bothner (bothner@cygnus.com) */
#ifndef _POSIX_SOURCE
# define _POSIX_SOURCE
#endif
#include "libioP.h"
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#ifdef _LIBC
# define open(Name, Flags, Prot) __open ((Name), (Flags), (Prot))
#endif
/* An fstream can be in at most one of put mode, get mode, or putback mode.
Putback mode is a variant of get mode.
In a filebuf, there is only one current position, instead of two
separate get and put pointers. In get mode, the current position
is that of gptr(); in put mode that of pptr().
The position in the buffer that corresponds to the position
in external file system is normally _IO_read_end, except in putback
mode, when it is _IO_save_end.
If the field _fb._offset is >= 0, it gives the offset in
the file as a whole corresponding to eGptr(). (?)
PUT MODE:
If a filebuf is in put mode, then all of _IO_read_ptr, _IO_read_end,
and _IO_read_base are equal to each other. These are usually equal
to _IO_buf_base, though not necessarily if we have switched from
get mode to put mode. (The reason is to maintain the invariant
that _IO_read_end corresponds to the external file position.)
_IO_write_base is non-NULL and usually equal to _IO_base_base.
We also have _IO_write_end == _IO_buf_end, but only in fully buffered mode.
The un-flushed character are those between _IO_write_base and _IO_write_ptr.
GET MODE:
If a filebuf is in get or putback mode, eback() != egptr().
In get mode, the unread characters are between gptr() and egptr().
The OS file position corresponds to that of egptr().
PUTBACK MODE:
Putback mode is used to remember "excess" characters that have
been sputbackc'd in a separate putback buffer.
In putback mode, the get buffer points to the special putback buffer.
The unread characters are the characters between gptr() and egptr()
in the putback buffer, as well as the area between save_gptr()
and save_egptr(), which point into the original reserve buffer.
(The pointers save_gptr() and save_egptr() are the values
of gptr() and egptr() at the time putback mode was entered.)
The OS position corresponds to that of save_egptr().
LINE BUFFERED OUTPUT:
During line buffered output, _IO_write_base==base() && epptr()==base().
However, ptr() may be anywhere between base() and ebuf().
This forces a call to filebuf::overflow(int C) on every put.
If there is more space in the buffer, and C is not a '\n',
then C is inserted, and pptr() incremented.
UNBUFFERED STREAMS:
If a filebuf is unbuffered(), the _shortbuf[1] is used as the buffer.
*/
#define CLOSED_FILEBUF_FLAGS \
(_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET)
void
DEFUN(_IO_file_init, (fp),
register _IO_FILE *fp)
{
/* POSIX.1 allows another file handle to be used to change the position
of our file descriptor. Hence we actually don't know the actual
position before we do the first fseek (and until a following fflush). */
fp->_offset = _IO_pos_BAD;
fp->_IO_file_flags |= CLOSED_FILEBUF_FLAGS;
_IO_link_in(fp);
fp->_fileno = -1;
}
int
DEFUN(_IO_file_close_it, (fp),
register _IO_FILE* fp)
{
int write_status, close_status;
if (!_IO_file_is_open(fp))
return EOF;
write_status = _IO_do_flush (fp);
_IO_unsave_markers(fp);
close_status = _IO_SYSCLOSE (fp);
/* Free buffer. */
_IO_setb(fp, NULL, NULL, 0);
_IO_setg(fp, NULL, NULL, NULL);
_IO_setp(fp, NULL, NULL);
_IO_un_link(fp);
fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS;
fp->_fileno = EOF;
fp->_offset = _IO_pos_BAD;
return close_status ? close_status : write_status;
}
void
DEFUN(_IO_file_finish, (fp, dummy),
register _IO_FILE* fp AND int dummy)
{
if (_IO_file_is_open(fp))
{
_IO_do_flush (fp);
if (!(fp->_flags & _IO_DELETE_DONT_CLOSE))
_IO_SYSCLOSE (fp);
}
_IO_default_finish(fp, 0);
}
_IO_FILE *
DEFUN(_IO_file_fopen, (fp, filename, mode),
register _IO_FILE *fp AND const char *filename AND const char *mode)
{
int oflags = 0, omode;
int read_write, fdesc;
int oprot = 0666;
if (_IO_file_is_open (fp))
return 0;
switch (*mode++) {
case 'r':
omode = O_RDONLY;
read_write = _IO_NO_WRITES;
break;
case 'w':
omode = O_WRONLY;
oflags = O_CREAT|O_TRUNC;
read_write = _IO_NO_READS;
break;
case 'a':
omode = O_WRONLY;
oflags = O_CREAT|O_APPEND;
read_write = _IO_NO_READS|_IO_IS_APPENDING;
break;
default:
__set_errno (EINVAL);
return NULL;
}
if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) {
omode = O_RDWR;
read_write &= _IO_IS_APPENDING;
}
fdesc = open(filename, omode|oflags, oprot);
if (fdesc < 0)
return NULL;
fp->_fileno = fdesc;
_IO_mask_flags(fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
if (read_write & _IO_IS_APPENDING)
if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_end, _IOS_INPUT|_IOS_OUTPUT)
== _IO_pos_BAD && errno != ESPIPE)
return NULL;
_IO_link_in(fp);
return fp;
}
_IO_FILE*
DEFUN(_IO_file_attach, (fp, fd),
_IO_FILE *fp AND int fd)
{
if (_IO_file_is_open(fp))
return NULL;
fp->_fileno = fd;
fp->_flags &= ~(_IO_NO_READS+_IO_NO_WRITES);
fp->_flags |= _IO_DELETE_DONT_CLOSE;
/* Get the current position of the file. */
/* We have to do that since that may be junk. */
fp->_offset = _IO_pos_BAD;
if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT)
== _IO_pos_BAD && errno != ESPIPE)
return NULL;
return fp;
}
_IO_FILE*
DEFUN(_IO_file_setbuf, (fp, p, len),
register _IO_FILE *fp AND char* p AND _IO_ssize_t len)
{
if (_IO_default_setbuf(fp, p, len) == NULL)
return NULL;
fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end
= fp->_IO_buf_base;
_IO_setg(fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
return fp;
}
/* Write TO_DO bytes from DATA to FP.
Then mark FP as having empty buffers. */
int
DEFUN(_IO_do_write, (fp, data, to_do),
register _IO_FILE *fp AND const char* data AND _IO_size_t to_do)
{
_IO_size_t count;
if (to_do == 0)
return 0;
if (fp->_flags & _IO_IS_APPENDING)
/* On a system without a proper O_APPEND implementation,
you would need to sys_seek(0, SEEK_END) here, but is
is not needed nor desirable for Unix- or Posix-like systems.
Instead, just indicate that offset (before and after) is
unpredictable. */
fp->_offset = _IO_pos_BAD;
else if (fp->_IO_read_end != fp->_IO_write_base)
{
_IO_pos_t new_pos
= _IO_SYSSEEK(fp, fp->_IO_write_base - fp->_IO_read_end, 1);
if (new_pos == _IO_pos_BAD)
return EOF;
fp->_offset = new_pos;
}
count = _IO_SYSWRITE (fp, data, to_do);
if (fp->_cur_column)
fp->_cur_column = _IO_adjust_column(fp->_cur_column - 1, data, to_do) + 1;
_IO_setg(fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base;
fp->_IO_write_end = (fp->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED)) ? fp->_IO_buf_base
: fp->_IO_buf_end;
return count != to_do ? EOF : 0;
}
int
DEFUN(_IO_file_underflow, (fp),
register _IO_FILE *fp)
{
_IO_ssize_t count;
#if 0
/* SysV does not make this test; take it out for compatibility */
if (fp->_flags & _IO_EOF_SEEN)
return (EOF);
#endif
if (fp->_flags & _IO_NO_READS)
{
__set_errno (EBADF);
return EOF;
}
if (fp->_IO_read_ptr < fp->_IO_read_end)
return *(unsigned char*)fp->_IO_read_ptr;
if (fp->_IO_buf_base == NULL)
_IO_doallocbuf(fp);
/* Flush all line buffered files before reading. */
/* FIXME This can/should be moved to genops ?? */
if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED))
_IO_flush_all_linebuffered();
_IO_switch_to_get_mode(fp);
count = _IO_SYSREAD (fp, fp->_IO_buf_base,
fp->_IO_buf_end - fp->_IO_buf_base);
if (count <= 0)
{
if (count == 0)
fp->_flags |= _IO_EOF_SEEN;
else
fp->_flags |= _IO_ERR_SEEN, count = 0;
}
fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base;
fp->_IO_read_end = fp->_IO_buf_base + count;
fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end
= fp->_IO_buf_base;
if (count == 0)
return EOF;
if (fp->_offset != _IO_pos_BAD)
_IO_pos_adjust(fp->_offset, count);
return *(unsigned char*)fp->_IO_read_ptr;
}
int
DEFUN(_IO_file_overflow, (f, ch),
register _IO_FILE* f AND int ch)
{
if (f->_flags & _IO_NO_WRITES) /* SET ERROR */
{
f->_flags |= _IO_ERR_SEEN;
__set_errno (EBADF);
return EOF;
}
/* If currently reading or no buffer allocated. */
if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0)
{
/* Allocate a buffer if needed. */
if (f->_IO_write_base == 0)
{
_IO_doallocbuf(f);
_IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base);
}
/* Otherwise must be currently reading.
If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end,
logically slide the buffer forwards one block (by setting the
read pointers to all point at the beginning of the block). This
makes room for subsequent output.
Otherwise, set the read pointers to _IO_read_end (leaving that
alone, so it can continue to correspond to the external position). */
if (f->_IO_read_ptr == f->_IO_buf_end)
f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base;
f->_IO_write_ptr = f->_IO_read_ptr;
f->_IO_write_base = f->_IO_write_ptr;
f->_IO_write_end = f->_IO_buf_end;
f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end;
if (f->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED))
f->_IO_write_end = f->_IO_write_ptr;
f->_flags |= _IO_CURRENTLY_PUTTING;
}
if (ch == EOF)
return _IO_do_flush(f);
if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */
if (_IO_do_flush(f) == EOF)
return EOF;
*f->_IO_write_ptr++ = ch;
if ((f->_flags & _IO_UNBUFFERED)
|| ((f->_flags & _IO_LINE_BUF) && ch == '\n'))
if (_IO_do_flush(f) == EOF)
return EOF;
return (unsigned char)ch;
}
int
DEFUN(_IO_file_sync, (fp),
register _IO_FILE* fp)
{
_IO_size_t delta;
/* char* ptr = cur_ptr(); */
if (fp->_IO_write_ptr > fp->_IO_write_base)
if (_IO_do_flush(fp)) return EOF;
delta = fp->_IO_read_ptr - fp->_IO_read_end;
if (delta != 0)
{
#ifdef TODO
if (_IO_in_backup(fp))
delta -= eGptr() - Gbase();
#endif
_IO_off_t new_pos = _IO_SYSSEEK (fp, delta, 1);
if (new_pos != (_IO_off_t)EOF)
fp->_IO_read_end = fp->_IO_read_ptr;
#ifdef ESPIPE
else if (errno == ESPIPE)
; /* Ignore error from unseekable devices. */
#endif
else
return EOF;
}
fp->_offset = _IO_pos_BAD;
/* FIXME: Cleanup - can this be shared? */
/* setg(base(), ptr, ptr); */
return 0;
}
_IO_pos_t
DEFUN(_IO_file_seekoff, (fp, offset, dir, mode),
register _IO_FILE *fp AND _IO_off_t offset AND int dir AND int mode)
{
_IO_pos_t result;
_IO_off_t delta, new_offset;
long count;
/* POSIX.1 8.2.3.7 says that after a call the fflush() the file
offset of the underlying file must be exact. */
int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end
&& fp->_IO_write_base == fp->_IO_write_ptr);
if (mode == 0)
dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */
/* Flush unwritten characters.
(This may do an unneeded write if we seek within the buffer.
But to be able to switch to reading, we would need to set
egptr to ptr. That can't be done in the current design,
which assumes file_ptr() is eGptr. Anyway, since we probably
end up flushing when we close(), it doesn't make much difference.)
FIXME: simulate mem-papped files. */
if (fp->_IO_write_ptr > fp->_IO_write_base || _IO_in_put_mode(fp))
if (_IO_switch_to_get_mode(fp)) return EOF;
if (fp->_IO_buf_base == NULL)
{
_IO_doallocbuf(fp);
_IO_setp(fp, fp->_IO_buf_base, fp->_IO_buf_base);
_IO_setg(fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
}
switch (dir)
{
case _IO_seek_cur:
/* Adjust for read-ahead (bytes is buffer). */
offset -= fp->_IO_read_end - fp->_IO_read_ptr;
if (fp->_offset == _IO_pos_BAD)
goto dumb;
/* Make offset absolute, assuming current pointer is file_ptr(). */
offset += _IO_pos_as_off(fp->_offset);
dir = _IO_seek_set;
break;
case _IO_seek_set:
break;
case _IO_seek_end:
{
struct stat st;
if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG(st.st_mode))
{
offset += st.st_size;
dir = _IO_seek_set;
}
else
goto dumb;
}
}
/* At this point, dir==_IO_seek_set. */
/* If destination is within current buffer, optimize: */
if (fp->_offset != _IO_pos_BAD && fp->_IO_read_base != NULL
&& !_IO_in_backup (fp))
{
/* Offset relative to start of main get area. */
_IO_pos_t rel_offset = offset - fp->_offset
+ (fp->_IO_read_end - fp->_IO_read_base);
if (rel_offset >= 0)
{
#if 0
if (_IO_in_backup(fp))
_IO_switch_to_main_get_area(fp);
#endif
if (rel_offset <= fp->_IO_read_end - fp->_IO_read_base)
{
_IO_setg(fp, fp->_IO_buf_base, fp->_IO_buf_base + rel_offset,
fp->_IO_read_end);
_IO_setp(fp, fp->_IO_buf_base, fp->_IO_buf_base);
return offset;
}
#ifdef TODO
/* If we have streammarkers, seek forward by reading ahead. */
if (_IO_have_markers(fp))
{
int to_skip = rel_offset
- (fp->_IO_read_ptr - fp->_IO_read_base);
if (ignore(to_skip) != to_skip)
goto dumb;
return offset;
}
#endif
}
#ifdef TODO
if (rel_offset < 0 && rel_offset >= Bbase() - Bptr())
{
if (!_IO_in_backup(fp))
_IO_switch_to_backup_area(fp);
gbump(fp->_IO_read_end + rel_offset - fp->_IO_read_ptr);
return offset;
}
#endif
}
#ifdef TODO
_IO_unsave_markers(fp);
#endif
if (fp->_flags & _IO_NO_READS)
goto dumb;
/* Try to seek to a block boundary, to improve kernel page management. */
new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1);
delta = offset - new_offset;
if (delta > fp->_IO_buf_end - fp->_IO_buf_base)
{
new_offset = offset;
delta = 0;
}
result = _IO_SYSSEEK (fp, new_offset, 0);
if (result < 0)
return EOF;
if (delta == 0)
count = 0;
else
{
count = _IO_SYSREAD (fp, fp->_IO_buf_base,
(must_be_exact
? delta : fp->_IO_buf_end - fp->_IO_buf_base));
if (count < delta)
{
/* We weren't allowed to read, but try to seek the remainder. */
offset = count == EOF ? delta : delta-count;
dir = _IO_seek_cur;
goto dumb;
}
}
_IO_setg(fp, fp->_IO_buf_base, fp->_IO_buf_base+delta, fp->_IO_buf_base+count);
_IO_setp(fp, fp->_IO_buf_base, fp->_IO_buf_base);
fp->_offset = result + count;
_IO_mask_flags(fp, 0, _IO_EOF_SEEN);
return offset;
dumb:
_IO_unsave_markers(fp);
result = _IO_SYSSEEK (fp, offset, dir);
if (result != EOF)
_IO_mask_flags(fp, 0, _IO_EOF_SEEN);
fp->_offset = result;
_IO_setg(fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
_IO_setp(fp, fp->_IO_buf_base, fp->_IO_buf_base);
return result;
}
_IO_ssize_t
DEFUN(_IO_file_read, (fp, buf, size),
register _IO_FILE* fp AND void* buf AND _IO_ssize_t size)
{
for (;;)
{
_IO_ssize_t count = _IO_read(fp->_fileno, buf, size);
#if 0 && defined EINTR
/* We must not do this optimization since POSIX.1 explicitly
requests that the stream operations must return with the
error EINTR if this happens. There must be the possibility
that stream operations time out. --drepper */
if (count == -1 && errno == EINTR)
continue;
#endif
return count;
}
}
_IO_pos_t
DEFUN(_IO_file_seek, (fp, offset, dir),
_IO_FILE *fp AND _IO_off_t offset AND int dir)
{
return _IO_lseek(fp->_fileno, offset, dir);
}
int
DEFUN(_IO_file_stat, (fp, st),
_IO_FILE *fp AND void* st)
{
return _IO_fstat(fp->_fileno, (struct stat*)st);
}
int
DEFUN(_IO_file_close, (fp),
_IO_FILE* fp)
{
return _IO_close(fp->_fileno);
}
_IO_ssize_t
DEFUN(_IO_file_write, (f, data, n),
register _IO_FILE* f AND const void* data AND _IO_ssize_t n)
{
_IO_ssize_t to_do = n;
while (to_do > 0)
{
_IO_ssize_t count = _IO_write(f->_fileno, data, to_do);
if (count == EOF)
{
#if 0 && defined EINTR
/* We must not do this optimization since POSIX.1 explicitly
requests that the stream operations must return with the
error EINTR if this happens. There must be the
possibility that stream operations time out. --drepper */
if (errno == EINTR)
continue;
else
#endif
{
f->_flags |= _IO_ERR_SEEN;
break;
}
}
to_do -= count;
data = (void*)((char*)data + count);
}
n -= to_do;
if (f->_offset >= 0)
f->_offset += n;
return n;
}
_IO_size_t
DEFUN(_IO_file_xsputn, (f, data, n),
_IO_FILE *f AND const void *data AND _IO_size_t n)
{
register const char *s = (char*) data;
_IO_size_t to_do = n;
int must_flush = 0;
_IO_size_t count;
if (n <= 0)
return 0;
/* This is an optimized implementation.
If the amount to be written straddles a block boundary
(or the filebuf is unbuffered), use sys_write directly. */
/* First figure out how much space is available in the buffer. */
count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */
if ((f->_flags & _IO_LINE_BUF) && (f->_flags & _IO_CURRENTLY_PUTTING))
{
count = f->_IO_buf_end - f->_IO_write_ptr;
if (count >= n)
{ register const char *p;
for (p = s + n; p > s; )
{
if (*--p == '\n') {
count = p - s + 1;
must_flush = 1;
break;
}
}
}
}
/* Then fill the buffer. */
if (count > 0)
{
if (count > to_do)
count = to_do;
if (count > 20) {
memcpy(f->_IO_write_ptr, s, count);
s += count;
}
else
{
register char *p = f->_IO_write_ptr;
register int i = (int)count;
while (--i >= 0) *p++ = *s++;
}
f->_IO_write_ptr += count;
to_do -= count;
}
if (to_do + must_flush > 0)
{ _IO_size_t block_size, dont_write;
/* Next flush the (full) buffer. */
if (__overflow(f, EOF) == EOF)
return n - to_do;
/* Try to maintain alignment: write a whole number of blocks.
dont_write is what gets left over. */
block_size = f->_IO_buf_end - f->_IO_buf_base;
dont_write = block_size >= 128 ? to_do % block_size : 0;
count = to_do - dont_write;
if (_IO_do_write(f, s, count) == EOF)
return n - to_do;
to_do = dont_write;
/* Now write out the remainder. Normally, this will fit in the
buffer, but it's somewhat messier for line-buffered files,
so we let _IO_default_xsputn handle the general case. */
if (dont_write)
to_do -= _IO_default_xsputn(f, s+count, dont_write);
}
return n - to_do;
}
#if 0
/* Work in progress */
_IO_size_t
DEFUN(_IO_file_xsgetn, (fp, data, n),
_IO_FILE *fp AND void *data AND _IO_size_t n)
{
register _IO_size_t more = n;
register char *s = data;
for (;;)
{
_IO_ssize_t count = fp->_IO_read_end - fp->_IO_read_ptr; /* Data available. */
if (count > 0)
{
if (count > more)
count = more;
if (count > 20)
{
memcpy(s, fp->_IO_read_ptr, count);
s += count;
fp->_IO_read_ptr += count;
}
else if (count <= 0)
count = 0;
else
{
register char *p = fp->_IO_read_ptr;
register int i = (int)count;
while (--i >= 0) *s++ = *p++;
fp->_IO_read_ptr = p;
}
more -= count;
}
#if 0
if (! _IO_in put_mode (fp)
&& ! _IO_have_markers (fp) && ! IO_have_backup (fp))
{
/* This is an optimization of _IO_file_underflow */
if (fp->_flags & _IO_NO_READS)
break;
/* If we're reading a lot of data, don't bother allocating
a buffer. But if we're only reading a bit, perhaps we should ??*/
if (count <= 512 && fp->_IO_buf_base == NULL)
_IO_doallocbuf(fp);
if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED))
_IO_flush_all_linebuffered();
_IO_switch_to_get_mode(fp); ???;
count = _IO_SYSREAD (fp, s, more);
if (count <= 0)
{
if (count == 0)
fp->_flags |= _IO_EOF_SEEN;
else
fp->_flags |= _IO_ERR_SEEN, count = 0;
}
s += count;
more -= count;
}
#endif
if (more == 0 || __underflow(fp) == EOF)
break;
}
return n - more;
}
#endif
struct _IO_jump_t _IO_file_jumps = {
JUMP_INIT_DUMMY,
JUMP_INIT(finish, _IO_file_finish),
JUMP_INIT(overflow, _IO_file_overflow),
JUMP_INIT(underflow, _IO_file_underflow),
JUMP_INIT(uflow, _IO_default_uflow),
JUMP_INIT(pbackfail, _IO_default_pbackfail),
JUMP_INIT(xsputn, _IO_file_xsputn),
JUMP_INIT(xsgetn, _IO_default_xsgetn),
JUMP_INIT(seekoff, _IO_file_seekoff),
JUMP_INIT(seekpos, _IO_default_seekpos),
JUMP_INIT(setbuf, _IO_file_setbuf),
JUMP_INIT(sync, _IO_file_sync),
JUMP_INIT(doallocate, _IO_file_doallocate),
JUMP_INIT(read, _IO_file_read),
JUMP_INIT(write, _IO_file_write),
JUMP_INIT(seek, _IO_file_seek),
JUMP_INIT(close, _IO_file_close),
JUMP_INIT(stat, _IO_file_stat)
};