mirror of
https://sourceware.org/git/glibc.git
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371 lines
9.9 KiB
C
371 lines
9.9 KiB
C
/* Copyright (C) 1993-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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#include <assert.h>
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#include "strfile.h"
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#include "libioP.h"
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#include <string.h>
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#include <stdio_ext.h>
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void
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_IO_str_init_static_internal (sf, ptr, size, pstart)
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_IO_strfile *sf;
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char *ptr;
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_IO_size_t size;
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char *pstart;
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{
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_IO_FILE *fp = &sf->_sbf._f;
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char *end;
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if (size == 0)
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end = __rawmemchr (ptr, '\0');
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else if ((_IO_size_t) ptr + size > (_IO_size_t) ptr)
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end = ptr + size;
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else
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end = (char *) -1;
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_IO_setb (fp, ptr, end, 0);
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fp->_IO_write_base = ptr;
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fp->_IO_read_base = ptr;
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fp->_IO_read_ptr = ptr;
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if (pstart)
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{
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fp->_IO_write_ptr = pstart;
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fp->_IO_write_end = end;
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fp->_IO_read_end = pstart;
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}
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else
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{
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fp->_IO_write_ptr = ptr;
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fp->_IO_write_end = ptr;
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fp->_IO_read_end = end;
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}
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/* A null _allocate_buffer function flags the strfile as being static. */
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sf->_s._allocate_buffer = (_IO_alloc_type) 0;
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}
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void
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_IO_str_init_static (sf, ptr, size, pstart)
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_IO_strfile *sf;
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char *ptr;
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int size;
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char *pstart;
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{
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return _IO_str_init_static_internal (sf, ptr, size < 0 ? -1 : size, pstart);
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}
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void
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_IO_str_init_readonly (sf, ptr, size)
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_IO_strfile *sf;
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const char *ptr;
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int size;
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{
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_IO_str_init_static_internal (sf, (char *) ptr, size < 0 ? -1 : size, NULL);
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sf->_sbf._f._IO_file_flags |= _IO_NO_WRITES;
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}
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int
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_IO_str_overflow (fp, c)
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_IO_FILE *fp;
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int c;
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{
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int flush_only = c == EOF;
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_IO_size_t pos;
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if (fp->_flags & _IO_NO_WRITES)
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return flush_only ? 0 : EOF;
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if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING))
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{
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fp->_flags |= _IO_CURRENTLY_PUTTING;
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fp->_IO_write_ptr = fp->_IO_read_ptr;
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fp->_IO_read_ptr = fp->_IO_read_end;
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}
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pos = fp->_IO_write_ptr - fp->_IO_write_base;
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if (pos >= (_IO_size_t) (_IO_blen (fp) + flush_only))
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{
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if (fp->_flags & _IO_USER_BUF) /* not allowed to enlarge */
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return EOF;
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else
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{
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char *new_buf;
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char *old_buf = fp->_IO_buf_base;
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size_t old_blen = _IO_blen (fp);
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_IO_size_t new_size = 2 * old_blen + 100;
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if (new_size < old_blen)
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return EOF;
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new_buf
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= (char *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size);
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if (new_buf == NULL)
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{
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/* __ferror(fp) = 1; */
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return EOF;
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}
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if (old_buf)
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{
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memcpy (new_buf, old_buf, old_blen);
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(*((_IO_strfile *) fp)->_s._free_buffer) (old_buf);
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/* Make sure _IO_setb won't try to delete _IO_buf_base. */
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fp->_IO_buf_base = NULL;
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}
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memset (new_buf + old_blen, '\0', new_size - old_blen);
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_IO_setb (fp, new_buf, new_buf + new_size, 1);
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fp->_IO_read_base = new_buf + (fp->_IO_read_base - old_buf);
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fp->_IO_read_ptr = new_buf + (fp->_IO_read_ptr - old_buf);
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fp->_IO_read_end = new_buf + (fp->_IO_read_end - old_buf);
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fp->_IO_write_ptr = new_buf + (fp->_IO_write_ptr - old_buf);
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fp->_IO_write_base = new_buf;
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fp->_IO_write_end = fp->_IO_buf_end;
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}
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}
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if (!flush_only)
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*fp->_IO_write_ptr++ = (unsigned char) c;
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if (fp->_IO_write_ptr > fp->_IO_read_end)
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fp->_IO_read_end = fp->_IO_write_ptr;
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return c;
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}
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libc_hidden_def (_IO_str_overflow)
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int
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_IO_str_underflow (fp)
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_IO_FILE *fp;
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{
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if (fp->_IO_write_ptr > fp->_IO_read_end)
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fp->_IO_read_end = fp->_IO_write_ptr;
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if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING))
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{
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fp->_flags &= ~_IO_CURRENTLY_PUTTING;
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fp->_IO_read_ptr = fp->_IO_write_ptr;
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fp->_IO_write_ptr = fp->_IO_write_end;
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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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else
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return EOF;
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}
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libc_hidden_def (_IO_str_underflow)
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/* The size of the valid part of the buffer. */
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_IO_ssize_t
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_IO_str_count (fp)
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_IO_FILE *fp;
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{
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return ((fp->_IO_write_ptr > fp->_IO_read_end
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? fp->_IO_write_ptr : fp->_IO_read_end)
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- fp->_IO_read_base);
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}
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static int
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enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading)
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{
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if ((_IO_ssize_t) offset <= _IO_blen (fp))
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return 0;
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_IO_ssize_t oldend = fp->_IO_write_end - fp->_IO_write_base;
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/* Try to enlarge the buffer. */
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if (fp->_flags & _IO_USER_BUF)
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/* User-provided buffer. */
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return 1;
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_IO_size_t newsize = offset + 100;
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char *oldbuf = fp->_IO_buf_base;
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char *newbuf
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= (char *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize);
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if (newbuf == NULL)
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return 1;
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if (oldbuf != NULL)
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{
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memcpy (newbuf, oldbuf, _IO_blen (fp));
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(*((_IO_strfile *) fp)->_s._free_buffer) (oldbuf);
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/* Make sure _IO_setb won't try to delete
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_IO_buf_base. */
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fp->_IO_buf_base = NULL;
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}
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_IO_setb (fp, newbuf, newbuf + newsize, 1);
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if (reading)
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{
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fp->_IO_write_base = newbuf + (fp->_IO_write_base - oldbuf);
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fp->_IO_write_ptr = newbuf + (fp->_IO_write_ptr - oldbuf);
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fp->_IO_write_end = newbuf + (fp->_IO_write_end - oldbuf);
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fp->_IO_read_ptr = newbuf + (fp->_IO_read_ptr - oldbuf);
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fp->_IO_read_base = newbuf;
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fp->_IO_read_end = fp->_IO_buf_end;
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}
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else
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{
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fp->_IO_read_base = newbuf + (fp->_IO_read_base - oldbuf);
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fp->_IO_read_ptr = newbuf + (fp->_IO_read_ptr - oldbuf);
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fp->_IO_read_end = newbuf + (fp->_IO_read_end - oldbuf);
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fp->_IO_write_ptr = newbuf + (fp->_IO_write_ptr - oldbuf);
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fp->_IO_write_base = newbuf;
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fp->_IO_write_end = fp->_IO_buf_end;
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}
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/* Clear the area between the last write position and th
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new position. */
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assert (offset >= oldend);
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if (reading)
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memset (fp->_IO_read_base + oldend, '\0', offset - oldend);
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else
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memset (fp->_IO_write_base + oldend, '\0', offset - oldend);
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return 0;
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}
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_IO_off64_t
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_IO_str_seekoff (fp, offset, dir, mode)
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_IO_FILE *fp;
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_IO_off64_t offset;
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int dir;
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int mode;
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{
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_IO_off64_t new_pos;
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if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET))
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mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT);
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if (mode == 0)
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{
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/* Don't move any pointers. But there is no clear indication what
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mode FP is in. Let's guess. */
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if (fp->_IO_file_flags & _IO_NO_WRITES)
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new_pos = fp->_IO_read_ptr - fp->_IO_read_base;
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else
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new_pos = fp->_IO_write_ptr - fp->_IO_write_base;
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}
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else
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{
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_IO_ssize_t cur_size = _IO_str_count(fp);
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new_pos = EOF;
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/* Move the get pointer, if requested. */
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if (mode & _IOS_INPUT)
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{
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switch (dir)
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{
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case _IO_seek_end:
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offset += cur_size;
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break;
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case _IO_seek_cur:
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offset += fp->_IO_read_ptr - fp->_IO_read_base;
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break;
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default: /* case _IO_seek_set: */
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break;
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}
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if (offset < 0)
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return EOF;
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if ((_IO_ssize_t) offset > cur_size
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&& enlarge_userbuf (fp, offset, 1) != 0)
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return EOF;
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fp->_IO_read_ptr = fp->_IO_read_base + offset;
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fp->_IO_read_end = fp->_IO_read_base + cur_size;
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new_pos = offset;
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}
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/* Move the put pointer, if requested. */
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if (mode & _IOS_OUTPUT)
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{
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switch (dir)
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{
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case _IO_seek_end:
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offset += cur_size;
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break;
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case _IO_seek_cur:
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offset += fp->_IO_write_ptr - fp->_IO_write_base;
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break;
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default: /* case _IO_seek_set: */
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break;
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}
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if (offset < 0)
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return EOF;
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if ((_IO_ssize_t) offset > cur_size
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&& enlarge_userbuf (fp, offset, 0) != 0)
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return EOF;
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fp->_IO_write_ptr = fp->_IO_write_base + offset;
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new_pos = offset;
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}
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}
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return new_pos;
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}
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libc_hidden_def (_IO_str_seekoff)
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int
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_IO_str_pbackfail (fp, c)
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_IO_FILE *fp;
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int c;
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{
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if ((fp->_flags & _IO_NO_WRITES) && c != EOF)
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return EOF;
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return _IO_default_pbackfail (fp, c);
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}
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libc_hidden_def (_IO_str_pbackfail)
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void
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_IO_str_finish (fp, dummy)
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_IO_FILE *fp;
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int dummy;
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{
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if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
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(((_IO_strfile *) fp)->_s._free_buffer) (fp->_IO_buf_base);
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fp->_IO_buf_base = NULL;
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_IO_default_finish (fp, 0);
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}
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const struct _IO_jump_t _IO_str_jumps =
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{
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JUMP_INIT_DUMMY,
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JUMP_INIT(finish, _IO_str_finish),
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JUMP_INIT(overflow, _IO_str_overflow),
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JUMP_INIT(underflow, _IO_str_underflow),
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JUMP_INIT(uflow, _IO_default_uflow),
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JUMP_INIT(pbackfail, _IO_str_pbackfail),
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JUMP_INIT(xsputn, _IO_default_xsputn),
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JUMP_INIT(xsgetn, _IO_default_xsgetn),
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JUMP_INIT(seekoff, _IO_str_seekoff),
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JUMP_INIT(seekpos, _IO_default_seekpos),
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JUMP_INIT(setbuf, _IO_default_setbuf),
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JUMP_INIT(sync, _IO_default_sync),
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JUMP_INIT(doallocate, _IO_default_doallocate),
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JUMP_INIT(read, _IO_default_read),
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JUMP_INIT(write, _IO_default_write),
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JUMP_INIT(seek, _IO_default_seek),
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JUMP_INIT(close, _IO_default_close),
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JUMP_INIT(stat, _IO_default_stat),
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JUMP_INIT(showmanyc, _IO_default_showmanyc),
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JUMP_INIT(imbue, _IO_default_imbue)
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};
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