aboutsummaryrefslogtreecommitdiff
path: root/libio/oldfileops.c
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@redhat.com>1997-10-13 01:27:24 +0000
committerUlrich Drepper <drepper@redhat.com>1997-10-13 01:27:24 +0000
commit1ea89a402d892b68b193e2e4390d8eb33ed686e7 (patch)
tree5e14832655316159895c8ee546fd73e4c1a72914 /libio/oldfileops.c
parentdfd2257ad98eb0f6eab167e5fe5ff68ca87172e3 (diff)
downloadglibc-1ea89a402d892b68b193e2e4390d8eb33ed686e7.tar
glibc-1ea89a402d892b68b193e2e4390d8eb33ed686e7.tar.gz
glibc-1ea89a402d892b68b193e2e4390d8eb33ed686e7.tar.bz2
glibc-1ea89a402d892b68b193e2e4390d8eb33ed686e7.zip
1997-10-13 03:14 Ulrich Drepper <drepper@cygnus.com> * libc.map: Move _IO_fopen, fopen, _IO_stdin_, _IO_stdout_, _IO_stderr_, _IO_list_all, and freopen to GLIBC_2.1 version. * include/libc-symbol.h: Define define_symbol. * libio/Makefile [$(versioning)=yes] (routines): Add oldiofopen and oldfreopen. [$(versioning)=yes] (aux): Add oldfileops and oldstdfiles. * libio/fileops.c: Use _IO_FILE_complete when accessing _offset field. * libio/freopen.c: Use versioning. * libio/iofopen.c: Likewise. Generate object of type _IO_FILE_complete. * libio/iofopen64.c: Generate object of type _IO_FILE_complete. * libio/iolibio.h: Declare _IO_{old,new}_fopen and __{old,new}_freopen. Define _IO_old_freopen. * libio/libio.h: Remove _offset field from _IO_FILE. Rename _unused2 field to _old_offset. Declare _IO_std*_ streams as of type _IO_FILE_complete. * libio/libioP.h: Define _IO_FILE_complete. Declare callbacks for old fileops implementation. * libio/stdfile.c: Define standard stream of type _IO_FILE_complete. * libio/stdio.c: Correctly address FILE part of standard streams. * libio/oldfileops.c: New file. * libio/oldfreopen.c: New file. * libio/oldiofopen.c: New file. * libio/oldstdfiles.c: New file. * sysdeps/i386/fpu/bits/mathinline.h: Define fma optimization. * sysdeps/libm-i387/e_scalb.S: Make sure code gets into .text section. * sysdeps/libm-i387/e_scalbl.S: Likewise. * sysdeps/libm-i387/s_fma.S: Fix typo. * sysdeps/libm-i387/s_fmaf.S: Likewise. * sysdeps/libm-i387/s_fmal.S: Likewise. 1997-10-12 20:14 Zack Weinberg <zack@rabi.phys.columbia.edu> * sysdeps/stub/getsid.c: Add a stub_warning. * sysdeps/stub/mmap.c: Likewise. * sysdeps/stub/munmap.c: Likewise. * sysdeps/libm-ieee754/s_fma.c: New file. * sysdeps/libm-ieee754/s_fmaf.c: New file. * sysdeps/libm-ieee754/s_fmal.c: New file. * sysdeps/libm-ieee754/s_llrintf.c: New file. * sysdeps/libm-ieee754/s_llrintl.c: New file. * sysdeps/libm-ieee754/s_lrintf.c: New file. * sysdeps/libm-ieee754/s_lrintl.c: New file.
Diffstat (limited to 'libio/oldfileops.c')
-rw-r--r--libio/oldfileops.c720
1 files changed, 720 insertions, 0 deletions
diff --git a/libio/oldfileops.c b/libio/oldfileops.c
new file mode 100644
index 0000000000..ab4445c594
--- /dev/null
+++ b/libio/oldfileops.c
@@ -0,0 +1,720 @@
+/* Copyright (C) 1993, 1995, 1997 Free Software Foundation, Inc.
+ This file is part of the GNU IO Library.
+ Written by Per Bothner <bothner@cygnus.com>.
+
+ 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. */
+
+/* This is a compatibility file. If we don't build the libc with
+ versioning don't compile this file. */
+#if DO_VERSIONING
+
+
+#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
+#ifndef __set_errno
+# define __set_errno(Val) errno = (Val)
+#endif
+
+
+#ifdef _LIBC
+# define open(Name, Flags, Prot) __open (Name, Flags, Prot)
+# define close(FD) __close (FD)
+# define fstat(FD, Statbuf) __fstat (FD, Statbuf)
+# define lseek(FD, Offset, Whence) __lseek (FD, Offset, Whence)
+# define read(FD, Buf, NBytes) __read (FD, Buf, NBytes)
+# define write(FD, Buf, NBytes) __write (FD, Buf, NBytes)
+#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
+_IO_old_file_init (fp)
+ _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->_old_offset = _IO_pos_BAD;
+ fp->_IO_file_flags |= CLOSED_FILEBUF_FLAGS;
+
+ _IO_link_in(fp);
+ fp->_fileno = -1;
+}
+
+int
+_IO_old_file_close_it (fp)
+ _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->_old_offset = _IO_pos_BAD;
+
+ return close_status ? close_status : write_status;
+}
+
+void
+_IO_old_file_finish (fp, dummy)
+ _IO_FILE *fp;
+ 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 *
+_IO_old_file_fopen (fp, filename, mode)
+ _IO_FILE *fp;
+ const char *filename;
+ 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 *
+_IO_old_file_attach (fp, fd)
+ _IO_FILE *fp;
+ 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->_old_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 *
+_IO_old_file_setbuf (fp, p, len)
+ _IO_FILE *fp;
+ char *p;
+ _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
+_IO_old_do_write (fp, data, to_do)
+ _IO_FILE *fp;
+ const char *data;
+ _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->_old_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->_old_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
+_IO_old_file_underflow (fp)
+ _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);
+
+ /* This is very tricky. We have to adjust those
+ pointers before we call _IO_SYSREAD () since
+ we may longjump () out while waiting for
+ input. Those pointers may be screwed up. H.J. */
+ fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base;
+ fp->_IO_read_end = fp->_IO_buf_base;
+ fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end
+ = fp->_IO_buf_base;
+
+ 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_end += count;
+ if (count == 0)
+ return EOF;
+ if (fp->_old_offset != _IO_pos_BAD)
+ _IO_pos_adjust (fp->_old_offset, count);
+ return *(unsigned char *) fp->_IO_read_ptr;
+}
+
+int
+_IO_old_file_overflow (f, ch)
+ _IO_FILE *f;
+ 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
+_IO_old_file_sync (fp)
+ _IO_FILE *fp;
+{
+ _IO_size_t delta;
+ int retval = 0;
+
+ _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
+ _IO_flockfile (fp);
+ /* 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
+ retval = EOF;
+ }
+ if (retval != EOF)
+ fp->_old_offset = _IO_pos_BAD;
+ /* FIXME: Cleanup - can this be shared? */
+ /* setg(base(), ptr, ptr); */
+ _IO_cleanup_region_end (1);
+ return retval;
+}
+
+_IO_fpos64_t
+_IO_old_file_seekoff (fp, offset, dir, mode)
+ _IO_FILE *fp;
+ _IO_off64_t offset;
+ int dir;
+ int mode;
+{
+ _IO_pos_t result;
+ _IO_off64_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->_old_offset == _IO_pos_BAD)
+ goto dumb;
+ /* Make offset absolute, assuming current pointer is file_ptr(). */
+ offset += _IO_pos_as_off (fp->_old_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->_old_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->_old_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->_old_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->_old_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
+_IO_old_file_write (f, data, n)
+ _IO_FILE *f;
+ const void *data;
+ _IO_ssize_t n;
+{
+ _IO_ssize_t to_do = n;
+ while (to_do > 0)
+ {
+ _IO_ssize_t count = write (f->_fileno, data, to_do);
+ if (count == EOF)
+ {
+ f->_flags |= _IO_ERR_SEEN;
+ break;
+ }
+ to_do -= count;
+ data = (void *) ((char *) data + count);
+ }
+ n -= to_do;
+ if (f->_old_offset >= 0)
+ f->_old_offset += n;
+ return n;
+}
+
+_IO_size_t
+_IO_old_file_xsputn (f, data, n)
+ _IO_FILE *f;
+ const void *data;
+ _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;
+}
+
+
+struct _IO_jump_t _IO_old_file_jumps =
+{
+ JUMP_INIT_DUMMY,
+ JUMP_INIT(finish, _IO_old_file_finish),
+ JUMP_INIT(overflow, _IO_old_file_overflow),
+ JUMP_INIT(underflow, _IO_old_file_underflow),
+ JUMP_INIT(uflow, _IO_default_uflow),
+ JUMP_INIT(pbackfail, _IO_default_pbackfail),
+ JUMP_INIT(xsputn, _IO_old_file_xsputn),
+ JUMP_INIT(xsgetn, _IO_default_xsgetn),
+ JUMP_INIT(seekoff, _IO_old_file_seekoff),
+ JUMP_INIT(seekpos, _IO_default_seekpos),
+ JUMP_INIT(setbuf, _IO_old_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)
+};
+
+
+#endif /* DO_VERSIONING */