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* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
766 lines
23 KiB
C
766 lines
23 KiB
C
/* Copyright (C) 1993-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Per Bothner <bothner@cygnus.com>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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/* This is a compatibility file. If we don't build the libc with
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versioning don't compile this file. */
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
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#define _IO_USE_OLD_IO_FILE
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#include "libioP.h"
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* An fstream can be in at most one of put mode, get mode, or putback mode.
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Putback mode is a variant of get mode.
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In a filebuf, there is only one current position, instead of two
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separate get and put pointers. In get mode, the current position
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is that of gptr(); in put mode that of pptr().
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The position in the buffer that corresponds to the position
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in external file system is normally _IO_read_end, except in putback
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mode, when it is _IO_save_end.
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If the field _fb._offset is >= 0, it gives the offset in
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the file as a whole corresponding to eGptr(). (?)
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PUT MODE:
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If a filebuf is in put mode, then all of _IO_read_ptr, _IO_read_end,
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and _IO_read_base are equal to each other. These are usually equal
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to _IO_buf_base, though not necessarily if we have switched from
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get mode to put mode. (The reason is to maintain the invariant
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that _IO_read_end corresponds to the external file position.)
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_IO_write_base is non-NULL and usually equal to _IO_buf_base.
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We also have _IO_write_end == _IO_buf_end, but only in fully buffered mode.
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The un-flushed character are those between _IO_write_base and _IO_write_ptr.
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GET MODE:
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If a filebuf is in get or putback mode, eback() != egptr().
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In get mode, the unread characters are between gptr() and egptr().
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The OS file position corresponds to that of egptr().
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PUTBACK MODE:
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Putback mode is used to remember "excess" characters that have
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been sputbackc'd in a separate putback buffer.
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In putback mode, the get buffer points to the special putback buffer.
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The unread characters are the characters between gptr() and egptr()
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in the putback buffer, as well as the area between save_gptr()
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and save_egptr(), which point into the original reserve buffer.
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(The pointers save_gptr() and save_egptr() are the values
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of gptr() and egptr() at the time putback mode was entered.)
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The OS position corresponds to that of save_egptr().
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LINE BUFFERED OUTPUT:
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During line buffered output, _IO_write_base==base() && epptr()==base().
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However, ptr() may be anywhere between base() and ebuf().
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This forces a call to filebuf::overflow(int C) on every put.
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If there is more space in the buffer, and C is not a '\n',
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then C is inserted, and pptr() incremented.
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UNBUFFERED STREAMS:
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If a filebuf is unbuffered(), the _shortbuf[1] is used as the buffer.
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*/
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#define CLOSED_FILEBUF_FLAGS \
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(_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET)
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void
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attribute_compat_text_section
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_IO_old_file_init_internal (struct _IO_FILE_plus *fp)
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{
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/* POSIX.1 allows another file handle to be used to change the position
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of our file descriptor. Hence we actually don't know the actual
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position before we do the first fseek (and until a following fflush). */
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fp->file._old_offset = _IO_pos_BAD;
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fp->file._IO_file_flags |= CLOSED_FILEBUF_FLAGS;
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_IO_link_in (fp);
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fp->file._vtable_offset = ((int) sizeof (struct _IO_FILE)
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- (int) sizeof (struct _IO_FILE_complete));
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fp->file._fileno = -1;
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if (__builtin_expect (&_IO_stdin_used != NULL, 1)
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|| (fp != (struct _IO_FILE_plus *) _IO_stdin
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&& fp != (struct _IO_FILE_plus *) _IO_stdout
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&& fp != (struct _IO_FILE_plus *) _IO_stderr))
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/* The object is dynamically allocated and large enough. Initialize
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the _mode element as well. */
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((struct _IO_FILE_complete *) fp)->_mode = -1;
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}
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void
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attribute_compat_text_section
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_IO_old_file_init (struct _IO_FILE_plus *fp)
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{
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IO_set_accept_foreign_vtables (&_IO_vtable_check);
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_IO_old_file_init_internal (fp);
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}
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int
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attribute_compat_text_section
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_IO_old_file_close_it (_IO_FILE *fp)
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{
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int write_status, close_status;
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if (!_IO_file_is_open (fp))
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return EOF;
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write_status = _IO_old_do_flush (fp);
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_IO_unsave_markers (fp);
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close_status = ((fp->_flags2 & _IO_FLAGS2_NOCLOSE) == 0
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? _IO_SYSCLOSE (fp) : 0);
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/* Free buffer. */
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_IO_setb (fp, NULL, NULL, 0);
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_IO_setg (fp, NULL, NULL, NULL);
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_IO_setp (fp, NULL, NULL);
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_IO_un_link ((struct _IO_FILE_plus *) fp);
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fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS;
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fp->_fileno = -1;
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fp->_old_offset = _IO_pos_BAD;
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return close_status ? close_status : write_status;
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}
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void
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attribute_compat_text_section
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_IO_old_file_finish (_IO_FILE *fp, int dummy)
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{
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if (_IO_file_is_open (fp))
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{
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_IO_old_do_flush (fp);
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if (!(fp->_flags & _IO_DELETE_DONT_CLOSE))
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_IO_SYSCLOSE (fp);
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}
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_IO_default_finish (fp, 0);
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}
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_IO_FILE *
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attribute_compat_text_section
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_IO_old_file_fopen (_IO_FILE *fp, const char *filename, const char *mode)
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{
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int oflags = 0, omode;
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int read_write, fdesc;
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int oprot = 0666;
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if (_IO_file_is_open (fp))
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return 0;
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switch (*mode++)
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{
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case 'r':
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omode = O_RDONLY;
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read_write = _IO_NO_WRITES;
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break;
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case 'w':
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omode = O_WRONLY;
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oflags = O_CREAT|O_TRUNC;
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read_write = _IO_NO_READS;
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break;
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case 'a':
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omode = O_WRONLY;
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oflags = O_CREAT|O_APPEND;
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read_write = _IO_NO_READS|_IO_IS_APPENDING;
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break;
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default:
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__set_errno (EINVAL);
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return NULL;
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}
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if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+'))
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{
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omode = O_RDWR;
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read_write &= _IO_IS_APPENDING;
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}
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fdesc = __open (filename, omode|oflags, oprot);
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if (fdesc < 0)
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return NULL;
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fp->_fileno = fdesc;
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_IO_mask_flags (fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
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if (read_write & _IO_IS_APPENDING)
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if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_end, _IOS_INPUT|_IOS_OUTPUT)
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== _IO_pos_BAD && errno != ESPIPE)
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return NULL;
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_IO_link_in ((struct _IO_FILE_plus *) fp);
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return fp;
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}
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_IO_FILE *
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attribute_compat_text_section
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_IO_old_file_attach (_IO_FILE *fp, int fd)
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{
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if (_IO_file_is_open (fp))
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return NULL;
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fp->_fileno = fd;
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fp->_flags &= ~(_IO_NO_READS+_IO_NO_WRITES);
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fp->_flags |= _IO_DELETE_DONT_CLOSE;
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/* Get the current position of the file. */
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/* We have to do that since that may be junk. */
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fp->_old_offset = _IO_pos_BAD;
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if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT)
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== _IO_pos_BAD && errno != ESPIPE)
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return NULL;
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return fp;
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}
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_IO_FILE *
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attribute_compat_text_section
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_IO_old_file_setbuf (_IO_FILE *fp, char *p, _IO_ssize_t len)
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{
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if (_IO_default_setbuf (fp, p, len) == NULL)
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return NULL;
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fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end
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= fp->_IO_buf_base;
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_IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
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return fp;
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}
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static int old_do_write (_IO_FILE *, const char *, _IO_size_t);
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/* Write TO_DO bytes from DATA to FP.
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Then mark FP as having empty buffers. */
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int
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attribute_compat_text_section
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_IO_old_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do)
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{
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return (to_do == 0 || (_IO_size_t) old_do_write (fp, data, to_do) == to_do)
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? 0 : EOF;
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}
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static int
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attribute_compat_text_section
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old_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do)
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{
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_IO_size_t count;
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if (fp->_flags & _IO_IS_APPENDING)
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/* On a system without a proper O_APPEND implementation,
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you would need to sys_seek(0, SEEK_END) here, but is
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not needed nor desirable for Unix- or Posix-like systems.
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Instead, just indicate that offset (before and after) is
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unpredictable. */
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fp->_old_offset = _IO_pos_BAD;
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else if (fp->_IO_read_end != fp->_IO_write_base)
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{
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_IO_off_t new_pos
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= _IO_SYSSEEK (fp, fp->_IO_write_base - fp->_IO_read_end, 1);
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if (new_pos == _IO_pos_BAD)
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return 0;
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fp->_old_offset = new_pos;
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}
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count = _IO_SYSWRITE (fp, data, to_do);
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if (fp->_cur_column && count)
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fp->_cur_column = _IO_adjust_column (fp->_cur_column - 1, data, count) + 1;
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_IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
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fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base;
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fp->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
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? fp->_IO_buf_base : fp->_IO_buf_end);
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return count;
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}
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int
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attribute_compat_text_section
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_IO_old_file_underflow (_IO_FILE *fp)
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{
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_IO_ssize_t count;
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#if 0
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/* SysV does not make this test; take it out for compatibility */
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if (fp->_flags & _IO_EOF_SEEN)
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return (EOF);
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#endif
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if (fp->_flags & _IO_NO_READS)
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{
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fp->_flags |= _IO_ERR_SEEN;
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__set_errno (EBADF);
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return EOF;
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}
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if (fp->_IO_read_ptr < fp->_IO_read_end)
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return *(unsigned char *) fp->_IO_read_ptr;
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if (fp->_IO_buf_base == NULL)
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{
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/* Maybe we already have a push back pointer. */
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if (fp->_IO_save_base != NULL)
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{
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free (fp->_IO_save_base);
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fp->_flags &= ~_IO_IN_BACKUP;
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}
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_IO_doallocbuf (fp);
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}
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/* Flush all line buffered files before reading. */
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/* FIXME This can/should be moved to genops ?? */
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if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED))
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_IO_flush_all_linebuffered ();
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_IO_switch_to_get_mode (fp);
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/* This is very tricky. We have to adjust those
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pointers before we call _IO_SYSREAD () since
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we may longjump () out while waiting for
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input. Those pointers may be screwed up. H.J. */
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fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base;
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fp->_IO_read_end = fp->_IO_buf_base;
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fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end
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= fp->_IO_buf_base;
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count = _IO_SYSREAD (fp, fp->_IO_buf_base,
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fp->_IO_buf_end - fp->_IO_buf_base);
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if (count <= 0)
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{
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if (count == 0)
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fp->_flags |= _IO_EOF_SEEN;
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else
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fp->_flags |= _IO_ERR_SEEN, count = 0;
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}
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fp->_IO_read_end += count;
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if (count == 0)
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return EOF;
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if (fp->_old_offset != _IO_pos_BAD)
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_IO_pos_adjust (fp->_old_offset, count);
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return *(unsigned char *) fp->_IO_read_ptr;
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}
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int
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attribute_compat_text_section
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_IO_old_file_overflow (_IO_FILE *f, int ch)
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{
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if (f->_flags & _IO_NO_WRITES) /* SET ERROR */
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{
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f->_flags |= _IO_ERR_SEEN;
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__set_errno (EBADF);
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return EOF;
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}
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/* If currently reading or no buffer allocated. */
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if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0)
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{
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/* Allocate a buffer if needed. */
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if (f->_IO_write_base == 0)
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{
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_IO_doallocbuf (f);
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_IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base);
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}
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/* Otherwise must be currently reading.
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If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end,
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logically slide the buffer forwards one block (by setting the
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read pointers to all point at the beginning of the block). This
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makes room for subsequent output.
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Otherwise, set the read pointers to _IO_read_end (leaving that
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alone, so it can continue to correspond to the external position). */
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if (f->_IO_read_ptr == f->_IO_buf_end)
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f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base;
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f->_IO_write_ptr = f->_IO_read_ptr;
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f->_IO_write_base = f->_IO_write_ptr;
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f->_IO_write_end = f->_IO_buf_end;
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f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end;
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if (f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
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f->_IO_write_end = f->_IO_write_ptr;
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f->_flags |= _IO_CURRENTLY_PUTTING;
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}
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if (ch == EOF)
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return _IO_old_do_flush (f);
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if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */
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if (_IO_old_do_flush (f) == EOF)
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return EOF;
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*f->_IO_write_ptr++ = ch;
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if ((f->_flags & _IO_UNBUFFERED)
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|| ((f->_flags & _IO_LINE_BUF) && ch == '\n'))
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if (_IO_old_do_flush (f) == EOF)
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return EOF;
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return (unsigned char) ch;
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}
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|
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int
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attribute_compat_text_section
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_IO_old_file_sync (_IO_FILE *fp)
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{
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_IO_ssize_t delta;
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int retval = 0;
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/* char* ptr = cur_ptr(); */
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if (fp->_IO_write_ptr > fp->_IO_write_base)
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if (_IO_old_do_flush(fp)) return EOF;
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delta = fp->_IO_read_ptr - fp->_IO_read_end;
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if (delta != 0)
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{
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#ifdef TODO
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if (_IO_in_backup (fp))
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delta -= eGptr () - Gbase ();
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#endif
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_IO_off_t new_pos = _IO_SYSSEEK (fp, delta, 1);
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if (new_pos != (_IO_off_t) EOF)
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fp->_IO_read_end = fp->_IO_read_ptr;
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else if (errno == ESPIPE)
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; /* Ignore error from unseekable devices. */
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else
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retval = EOF;
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}
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if (retval != EOF)
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fp->_old_offset = _IO_pos_BAD;
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/* FIXME: Cleanup - can this be shared? */
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/* setg(base(), ptr, ptr); */
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return retval;
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}
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_IO_off64_t
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attribute_compat_text_section
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_IO_old_file_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode)
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|
{
|
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_IO_off_t result;
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_IO_off64_t delta, new_offset;
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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. */
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int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end
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&& fp->_IO_write_base == fp->_IO_write_ptr);
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if (mode == 0)
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dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */
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|
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/* 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 pptr. 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-mapped 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)
|
|
{
|
|
/* It could be that we already have a pushback buffer. */
|
|
if (fp->_IO_read_base != NULL)
|
|
{
|
|
free (fp->_IO_read_base);
|
|
fp->_flags &= ~_IO_IN_BACKUP;
|
|
}
|
|
_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 += fp->_old_offset;
|
|
|
|
dir = _IO_seek_set;
|
|
break;
|
|
case _IO_seek_set:
|
|
break;
|
|
case _IO_seek_end:
|
|
{
|
|
struct stat64 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 we are only interested in the current position we've found it now. */
|
|
if (mode == 0)
|
|
return offset;
|
|
|
|
/* 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_off_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);
|
|
{
|
|
_IO_mask_flags (fp, 0, _IO_EOF_SEEN);
|
|
goto resync;
|
|
}
|
|
}
|
|
#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;
|
|
_IO_mask_flags (fp, 0, _IO_EOF_SEEN);
|
|
goto resync;
|
|
}
|
|
#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);
|
|
_IO_mask_flags (fp, 0, _IO_EOF_SEEN);
|
|
goto resync;
|
|
}
|
|
#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;
|
|
|
|
resync:
|
|
/* We need to do it since it is possible that the file offset in
|
|
the kernel may be changed behind our back. It may happen when
|
|
we fopen a file and then do a fork. One process may access the
|
|
file and the kernel file offset will be changed. */
|
|
if (fp->_old_offset >= 0)
|
|
_IO_SYSSEEK (fp, fp->_old_offset, 0);
|
|
|
|
return offset;
|
|
}
|
|
|
|
_IO_ssize_t
|
|
attribute_compat_text_section
|
|
_IO_old_file_write (_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
|
|
attribute_compat_text_section
|
|
_IO_old_file_xsputn (_IO_FILE *f, const void *data, _IO_size_t n)
|
|
{
|
|
const char *s = (char *) data;
|
|
_IO_size_t to_do = n;
|
|
int must_flush = 0;
|
|
_IO_size_t count = 0;
|
|
|
|
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. */
|
|
if ((f->_flags & _IO_LINE_BUF) && (f->_flags & _IO_CURRENTLY_PUTTING))
|
|
{
|
|
count = f->_IO_buf_end - f->_IO_write_ptr;
|
|
if (count >= n)
|
|
{
|
|
const char *p;
|
|
for (p = s + n; p > s; )
|
|
{
|
|
if (*--p == '\n')
|
|
{
|
|
count = p - s + 1;
|
|
must_flush = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (f->_IO_write_end > f->_IO_write_ptr)
|
|
count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */
|
|
|
|
/* Then fill the buffer. */
|
|
if (count > 0)
|
|
{
|
|
if (count > to_do)
|
|
count = to_do;
|
|
if (count > 20)
|
|
{
|
|
f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count);
|
|
s += count;
|
|
}
|
|
else
|
|
{
|
|
char *p = f->_IO_write_ptr;
|
|
int i = (int) count;
|
|
while (--i >= 0)
|
|
*p++ = *s++;
|
|
f->_IO_write_ptr = p;
|
|
}
|
|
to_do -= count;
|
|
}
|
|
if (to_do + must_flush > 0)
|
|
{
|
|
_IO_size_t block_size, do_write;
|
|
/* Next flush the (full) buffer. */
|
|
if (__overflow (f, EOF) == EOF)
|
|
return to_do == 0 ? EOF : 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;
|
|
do_write = to_do - (block_size >= 128 ? to_do % block_size : 0);
|
|
|
|
if (do_write)
|
|
{
|
|
count = old_do_write (f, s, do_write);
|
|
to_do -= count;
|
|
if (count < do_write)
|
|
return n - to_do;
|
|
}
|
|
|
|
/* 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 (to_do)
|
|
to_do -= _IO_default_xsputn (f, s+do_write, to_do);
|
|
}
|
|
return n - to_do;
|
|
}
|
|
|
|
|
|
const struct _IO_jump_t _IO_old_file_jumps libio_vtable =
|
|
{
|
|
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_old_file_sync),
|
|
JUMP_INIT(doallocate, _IO_file_doallocate),
|
|
JUMP_INIT(read, _IO_file_read),
|
|
JUMP_INIT(write, _IO_old_file_write),
|
|
JUMP_INIT(seek, _IO_file_seek),
|
|
JUMP_INIT(close, _IO_file_close),
|
|
JUMP_INIT(stat, _IO_file_stat)
|
|
};
|
|
|
|
compat_symbol (libc, _IO_old_do_write, _IO_do_write, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_attach, _IO_file_attach, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_close_it, _IO_file_close_it, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_finish, _IO_file_finish, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_fopen, _IO_file_fopen, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_init, _IO_file_init, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_setbuf, _IO_file_setbuf, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_sync, _IO_file_sync, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_overflow, _IO_file_overflow, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_seekoff, _IO_file_seekoff, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_underflow, _IO_file_underflow, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_write, _IO_file_write, GLIBC_2_0);
|
|
compat_symbol (libc, _IO_old_file_xsputn, _IO_file_xsputn, GLIBC_2_0);
|
|
|
|
#endif
|