304 lines
8.4 KiB
C
304 lines
8.4 KiB
C
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/* Copyright (C) 1993, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU IO Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2, or (at
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your option) any later version.
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This library is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does
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not cause the resulting executable to be covered by the GNU General
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Public License. This exception does not however invalidate any
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other reasons why the executable file might be covered by the GNU
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General Public License. */
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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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#if 0
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/* The following definitions are for exposition only.
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They map the terminology used in the ANSI/ISO C++ draft standard
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to the implementation. */
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/* allocated: set when a dynamic array object has been allocated, and
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hence should be freed by the destructor for the strstreambuf object. */
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#define ALLOCATED(FP) ((FP)->_f._IO_buf_base && DYNAMIC(FP))
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/* constant: set when the array object has const elements,
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so the output sequence cannot be written. */
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#define CONSTANT(FP) ((FP)->_f._IO_file_flags & _IO_NO_WRITES)
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/* alsize: the suggested minimum size for a dynamic array object. */
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#define ALSIZE(FP) ??? /* not stored */
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/* palloc: points to the function to call to allocate a dynamic array object.*/
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#define PALLOC(FP) \
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((FP)->_s._allocate_buffer == default_alloc ? 0 : (FP)->_s._allocate_buffer)
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/* pfree: points to the function to call to free a dynamic array object. */
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#define PFREE(FP) \
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((FP)->_s._free_buffer == default_free ? 0 : (FP)->_s._free_buffer)
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#endif
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#ifdef TODO
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/* An "unbounded buffer" is when a buffer is supplied, but with no
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specified length. An example is the buffer argument to sprintf.
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*/
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#endif
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void
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_IO_str_init_static (fp, ptr, size, pstart)
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_IO_FILE *fp;
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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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if (size == 0)
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size = strlen (ptr);
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else if (size < 0)
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{
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/* If size is negative 'the characters are assumed to
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continue indefinitely.' This is kind of messy ... */
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int s;
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size = 512;
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/* Try increasing powers of 2, as long as we don't wrap around. */
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for (; s = 2*size, s > 0 && ptr + s > ptr && s < 0x4000000L; )
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size = s;
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/* Try increasing size as much as we can without wrapping around. */
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for (s = size >> 1; s > 0; s >>= 1)
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{
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if (ptr + size + s > ptr)
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size += s;
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}
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}
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_IO_setb (fp, ptr, ptr + size, 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 = ptr + size;
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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 = ptr+size;
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}
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/* A null _allocate_buffer function flags the strfile as being static. */
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(((_IO_strfile *) fp)->_s._allocate_buffer) = (_IO_alloc_type)0;
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}
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void
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_IO_str_init_readonly (fp, ptr, size)
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_IO_FILE *fp;
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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 (fp, (char *) ptr, size, NULL);
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fp->_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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_IO_size_t new_size = 2 * _IO_blen (fp) + 100;
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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 (fp->_IO_buf_base)
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{
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memcpy (new_buf, old_buf, _IO_blen (fp));
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(*((_IO_strfile *) fp)->_s._free_buffer) (fp->_IO_buf_base);
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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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#if 0
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if (lenp == &LEN(fp)) /* use '\0'-filling */
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memset (new_buf + pos, 0, blen() - pos);
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#endif
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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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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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/* 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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_IO_pos_t
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_IO_str_seekoff (fp, offset, dir, mode)
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_IO_FILE *fp;
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_IO_off_t offset;
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int dir;
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int mode;
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{
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_IO_ssize_t cur_size = _IO_str_count (fp);
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_IO_pos_t 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 || (_IO_ssize_t) offset > cur_size)
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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 || (_IO_ssize_t) offset > cur_size)
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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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return new_pos;
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}
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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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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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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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};
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