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291 lines
8.3 KiB
C
291 lines
8.3 KiB
C
/*
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Copyright (C) 1993 Free Software Foundation
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This file is part of the GNU IO Library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This 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
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GNU 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 the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, 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 not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU 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 terminlogy 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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DEFUN(_IO_str_init_static, (fp, ptr, size, pstart),
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_IO_FILE *fp AND char *ptr AND int size AND 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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_G_int32_t 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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DEFUN(_IO_str_init_readonly, (fp, ptr, size),
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_IO_FILE *fp AND const char *ptr AND 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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DEFUN(_IO_str_overflow, (fp, c),
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register _IO_FILE* fp AND 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_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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DEFUN(_IO_str_underflow, (fp),
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register _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 *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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DEFUN(_IO_str_count, (fp),
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register _IO_FILE *fp)
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{
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return (fp->_IO_write_ptr > fp->_IO_read_end ? fp->_IO_write_ptr
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: 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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DEFUN(_IO_str_seekoff, (fp, offset, dir, mode),
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register _IO_FILE *fp AND _IO_off_t offset AND int dir AND 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_size_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_size_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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DEFUN(_IO_str_pbackfail, (fp, c),
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register _IO_FILE *fp AND 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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DEFUN (_IO_str_finish, (fp),
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register _IO_FILE* fp)
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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);
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}
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struct _IO_jump_t _IO_str_jumps = {
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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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