mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-16 01:50:11 +00:00
371 lines
10 KiB
C
371 lines
10 KiB
C
/* Copyright (C) 1993, 1997-2003, 2004, 2006 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>.
|
|
|
|
As a special exception, if you link the code in this file with
|
|
files compiled with a GNU compiler to produce an executable,
|
|
that does not cause the resulting executable to be covered by
|
|
the GNU Lesser General Public License. This exception does not
|
|
however invalidate any other reasons why the executable file
|
|
might be covered by the GNU Lesser General Public License.
|
|
This exception applies to code released by its copyright holders
|
|
in files containing the exception. */
|
|
|
|
#include <assert.h>
|
|
#include "strfile.h"
|
|
#include "libioP.h"
|
|
#include <string.h>
|
|
#include <stdio_ext.h>
|
|
|
|
void
|
|
_IO_str_init_static_internal (sf, ptr, size, pstart)
|
|
_IO_strfile *sf;
|
|
char *ptr;
|
|
_IO_size_t size;
|
|
char *pstart;
|
|
{
|
|
_IO_FILE *fp = &sf->_sbf._f;
|
|
char *end;
|
|
|
|
if (size == 0)
|
|
end = __rawmemchr (ptr, '\0');
|
|
else if ((_IO_size_t) ptr + size > (_IO_size_t) ptr)
|
|
end = ptr + size;
|
|
else
|
|
end = (char *) -1;
|
|
INTUSE(_IO_setb) (fp, ptr, end, 0);
|
|
|
|
fp->_IO_write_base = ptr;
|
|
fp->_IO_read_base = ptr;
|
|
fp->_IO_read_ptr = ptr;
|
|
if (pstart)
|
|
{
|
|
fp->_IO_write_ptr = pstart;
|
|
fp->_IO_write_end = end;
|
|
fp->_IO_read_end = pstart;
|
|
}
|
|
else
|
|
{
|
|
fp->_IO_write_ptr = ptr;
|
|
fp->_IO_write_end = ptr;
|
|
fp->_IO_read_end = end;
|
|
}
|
|
/* A null _allocate_buffer function flags the strfile as being static. */
|
|
sf->_s._allocate_buffer = (_IO_alloc_type) 0;
|
|
}
|
|
|
|
void
|
|
_IO_str_init_static (sf, ptr, size, pstart)
|
|
_IO_strfile *sf;
|
|
char *ptr;
|
|
int size;
|
|
char *pstart;
|
|
{
|
|
return _IO_str_init_static_internal (sf, ptr, size < 0 ? -1 : size, pstart);
|
|
}
|
|
|
|
void
|
|
_IO_str_init_readonly (sf, ptr, size)
|
|
_IO_strfile *sf;
|
|
const char *ptr;
|
|
int size;
|
|
{
|
|
_IO_str_init_static_internal (sf, (char *) ptr, size < 0 ? -1 : size, NULL);
|
|
sf->_sbf._f._IO_file_flags |= _IO_NO_WRITES;
|
|
}
|
|
|
|
int
|
|
_IO_str_overflow (fp, c)
|
|
_IO_FILE *fp;
|
|
int c;
|
|
{
|
|
int flush_only = c == EOF;
|
|
_IO_size_t pos;
|
|
if (fp->_flags & _IO_NO_WRITES)
|
|
return flush_only ? 0 : EOF;
|
|
if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING))
|
|
{
|
|
fp->_flags |= _IO_CURRENTLY_PUTTING;
|
|
fp->_IO_write_ptr = fp->_IO_read_ptr;
|
|
fp->_IO_read_ptr = fp->_IO_read_end;
|
|
}
|
|
pos = fp->_IO_write_ptr - fp->_IO_write_base;
|
|
if (pos >= (_IO_size_t) (_IO_blen (fp) + flush_only))
|
|
{
|
|
if (fp->_flags & _IO_USER_BUF) /* not allowed to enlarge */
|
|
return EOF;
|
|
else
|
|
{
|
|
char *new_buf;
|
|
char *old_buf = fp->_IO_buf_base;
|
|
size_t old_blen = _IO_blen (fp);
|
|
_IO_size_t new_size = 2 * old_blen + 100;
|
|
if (new_size < old_blen)
|
|
return EOF;
|
|
new_buf
|
|
= (char *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size);
|
|
if (new_buf == NULL)
|
|
{
|
|
/* __ferror(fp) = 1; */
|
|
return EOF;
|
|
}
|
|
if (old_buf)
|
|
{
|
|
memcpy (new_buf, old_buf, old_blen);
|
|
(*((_IO_strfile *) fp)->_s._free_buffer) (old_buf);
|
|
/* Make sure _IO_setb won't try to delete _IO_buf_base. */
|
|
fp->_IO_buf_base = NULL;
|
|
}
|
|
memset (new_buf + old_blen, '\0', new_size - old_blen);
|
|
|
|
INTUSE(_IO_setb) (fp, new_buf, new_buf + new_size, 1);
|
|
fp->_IO_read_base = new_buf + (fp->_IO_read_base - old_buf);
|
|
fp->_IO_read_ptr = new_buf + (fp->_IO_read_ptr - old_buf);
|
|
fp->_IO_read_end = new_buf + (fp->_IO_read_end - old_buf);
|
|
fp->_IO_write_ptr = new_buf + (fp->_IO_write_ptr - old_buf);
|
|
|
|
fp->_IO_write_base = new_buf;
|
|
fp->_IO_write_end = fp->_IO_buf_end;
|
|
}
|
|
}
|
|
|
|
if (!flush_only)
|
|
*fp->_IO_write_ptr++ = (unsigned char) c;
|
|
if (fp->_IO_write_ptr > fp->_IO_read_end)
|
|
fp->_IO_read_end = fp->_IO_write_ptr;
|
|
return c;
|
|
}
|
|
INTDEF(_IO_str_overflow)
|
|
|
|
int
|
|
_IO_str_underflow (fp)
|
|
_IO_FILE *fp;
|
|
{
|
|
if (fp->_IO_write_ptr > fp->_IO_read_end)
|
|
fp->_IO_read_end = fp->_IO_write_ptr;
|
|
if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING))
|
|
{
|
|
fp->_flags &= ~_IO_CURRENTLY_PUTTING;
|
|
fp->_IO_read_ptr = fp->_IO_write_ptr;
|
|
fp->_IO_write_ptr = fp->_IO_write_end;
|
|
}
|
|
if (fp->_IO_read_ptr < fp->_IO_read_end)
|
|
return *((unsigned char *) fp->_IO_read_ptr);
|
|
else
|
|
return EOF;
|
|
}
|
|
INTDEF(_IO_str_underflow)
|
|
|
|
/* The size of the valid part of the buffer. */
|
|
|
|
_IO_ssize_t
|
|
_IO_str_count (fp)
|
|
_IO_FILE *fp;
|
|
{
|
|
return ((fp->_IO_write_ptr > fp->_IO_read_end
|
|
? fp->_IO_write_ptr : fp->_IO_read_end)
|
|
- fp->_IO_read_base);
|
|
}
|
|
|
|
|
|
static int
|
|
enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading)
|
|
{
|
|
if ((_IO_ssize_t) offset <= _IO_blen (fp))
|
|
return 0;
|
|
|
|
_IO_ssize_t oldend = fp->_IO_write_end - fp->_IO_write_base;
|
|
|
|
/* Try to enlarge the buffer. */
|
|
if (fp->_flags & _IO_USER_BUF)
|
|
/* User-provided buffer. */
|
|
return 1;
|
|
|
|
_IO_size_t newsize = offset + 100;
|
|
char *oldbuf = fp->_IO_buf_base;
|
|
char *newbuf
|
|
= (char *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize);
|
|
if (newbuf == NULL)
|
|
return 1;
|
|
|
|
if (oldbuf != NULL)
|
|
{
|
|
memcpy (newbuf, oldbuf, _IO_blen (fp));
|
|
(*((_IO_strfile *) fp)->_s._free_buffer) (oldbuf);
|
|
/* Make sure _IO_setb won't try to delete
|
|
_IO_buf_base. */
|
|
fp->_IO_buf_base = NULL;
|
|
}
|
|
|
|
INTUSE(_IO_setb) (fp, newbuf, newbuf + newsize, 1);
|
|
|
|
if (reading)
|
|
{
|
|
fp->_IO_write_base = newbuf + (fp->_IO_write_base - oldbuf);
|
|
fp->_IO_write_ptr = newbuf + (fp->_IO_write_ptr - oldbuf);
|
|
fp->_IO_write_end = newbuf + (fp->_IO_write_end - oldbuf);
|
|
fp->_IO_read_ptr = newbuf + (fp->_IO_read_ptr - oldbuf);
|
|
|
|
fp->_IO_read_base = newbuf;
|
|
fp->_IO_read_end = fp->_IO_buf_end;
|
|
}
|
|
else
|
|
{
|
|
fp->_IO_read_base = newbuf + (fp->_IO_read_base - oldbuf);
|
|
fp->_IO_read_ptr = newbuf + (fp->_IO_read_ptr - oldbuf);
|
|
fp->_IO_read_end = newbuf + (fp->_IO_read_end - oldbuf);
|
|
fp->_IO_write_ptr = newbuf + (fp->_IO_write_ptr - oldbuf);
|
|
|
|
fp->_IO_write_base = newbuf;
|
|
fp->_IO_write_end = fp->_IO_buf_end;
|
|
}
|
|
|
|
/* Clear the area between the last write position and th
|
|
new position. */
|
|
assert (offset >= oldend);
|
|
if (reading)
|
|
memset (fp->_IO_read_base + oldend, '\0', offset - oldend);
|
|
else
|
|
memset (fp->_IO_write_base + oldend, '\0', offset - oldend);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
_IO_off64_t
|
|
_IO_str_seekoff (fp, offset, dir, mode)
|
|
_IO_FILE *fp;
|
|
_IO_off64_t offset;
|
|
int dir;
|
|
int mode;
|
|
{
|
|
_IO_off64_t new_pos;
|
|
|
|
if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET))
|
|
mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT);
|
|
|
|
if (mode == 0)
|
|
{
|
|
/* Don't move any pointers. But there is no clear indication what
|
|
mode FP is in. Let's guess. */
|
|
if (fp->_IO_file_flags & _IO_NO_WRITES)
|
|
new_pos = fp->_IO_read_ptr - fp->_IO_read_base;
|
|
else
|
|
new_pos = fp->_IO_write_ptr - fp->_IO_write_base;
|
|
}
|
|
else
|
|
{
|
|
_IO_ssize_t cur_size = _IO_str_count(fp);
|
|
new_pos = EOF;
|
|
|
|
/* Move the get pointer, if requested. */
|
|
if (mode & _IOS_INPUT)
|
|
{
|
|
switch (dir)
|
|
{
|
|
case _IO_seek_end:
|
|
offset += cur_size;
|
|
break;
|
|
case _IO_seek_cur:
|
|
offset += fp->_IO_read_ptr - fp->_IO_read_base;
|
|
break;
|
|
default: /* case _IO_seek_set: */
|
|
break;
|
|
}
|
|
if (offset < 0)
|
|
return EOF;
|
|
if ((_IO_ssize_t) offset > cur_size
|
|
&& enlarge_userbuf (fp, offset, 1) != 0)
|
|
return EOF;
|
|
fp->_IO_read_ptr = fp->_IO_read_base + offset;
|
|
fp->_IO_read_end = fp->_IO_read_base + cur_size;
|
|
new_pos = offset;
|
|
}
|
|
|
|
/* Move the put pointer, if requested. */
|
|
if (mode & _IOS_OUTPUT)
|
|
{
|
|
switch (dir)
|
|
{
|
|
case _IO_seek_end:
|
|
offset += cur_size;
|
|
break;
|
|
case _IO_seek_cur:
|
|
offset += fp->_IO_write_ptr - fp->_IO_write_base;
|
|
break;
|
|
default: /* case _IO_seek_set: */
|
|
break;
|
|
}
|
|
if (offset < 0)
|
|
return EOF;
|
|
if ((_IO_ssize_t) offset > cur_size
|
|
&& enlarge_userbuf (fp, offset, 0) != 0)
|
|
return EOF;
|
|
fp->_IO_write_ptr = fp->_IO_write_base + offset;
|
|
new_pos = offset;
|
|
}
|
|
}
|
|
return new_pos;
|
|
}
|
|
INTDEF(_IO_str_seekoff)
|
|
|
|
int
|
|
_IO_str_pbackfail (fp, c)
|
|
_IO_FILE *fp;
|
|
int c;
|
|
{
|
|
if ((fp->_flags & _IO_NO_WRITES) && c != EOF)
|
|
return EOF;
|
|
return INTUSE(_IO_default_pbackfail) (fp, c);
|
|
}
|
|
INTDEF(_IO_str_pbackfail)
|
|
|
|
void
|
|
_IO_str_finish (fp, dummy)
|
|
_IO_FILE *fp;
|
|
int dummy;
|
|
{
|
|
if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
|
|
(((_IO_strfile *) fp)->_s._free_buffer) (fp->_IO_buf_base);
|
|
fp->_IO_buf_base = NULL;
|
|
|
|
INTUSE(_IO_default_finish) (fp, 0);
|
|
}
|
|
|
|
const struct _IO_jump_t _IO_str_jumps =
|
|
{
|
|
JUMP_INIT_DUMMY,
|
|
JUMP_INIT(finish, _IO_str_finish),
|
|
JUMP_INIT(overflow, INTUSE(_IO_str_overflow)),
|
|
JUMP_INIT(underflow, INTUSE(_IO_str_underflow)),
|
|
JUMP_INIT(uflow, INTUSE(_IO_default_uflow)),
|
|
JUMP_INIT(pbackfail, INTUSE(_IO_str_pbackfail)),
|
|
JUMP_INIT(xsputn, INTUSE(_IO_default_xsputn)),
|
|
JUMP_INIT(xsgetn, INTUSE(_IO_default_xsgetn)),
|
|
JUMP_INIT(seekoff, INTUSE(_IO_str_seekoff)),
|
|
JUMP_INIT(seekpos, _IO_default_seekpos),
|
|
JUMP_INIT(setbuf, _IO_default_setbuf),
|
|
JUMP_INIT(sync, _IO_default_sync),
|
|
JUMP_INIT(doallocate, INTUSE(_IO_default_doallocate)),
|
|
JUMP_INIT(read, _IO_default_read),
|
|
JUMP_INIT(write, _IO_default_write),
|
|
JUMP_INIT(seek, _IO_default_seek),
|
|
JUMP_INIT(close, _IO_default_close),
|
|
JUMP_INIT(stat, _IO_default_stat),
|
|
JUMP_INIT(showmanyc, _IO_default_showmanyc),
|
|
JUMP_INIT(imbue, _IO_default_imbue)
|
|
};
|