130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/* Copyright (C) 1995 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "strfile.h"
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#include "libioP.h"
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#include <stdlib.h>
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struct _IO_FILE_memstream
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{
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_IO_strfile _sf;
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char **bufloc;
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_IO_size_t *sizeloc;
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};
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static int _IO_mem_sync __P ((_IO_FILE* fp));
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static int _IO_mem_close __P ((_IO_FILE* fp));
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static const struct _IO_jump_t _IO_mem_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_mem_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_mem_close),
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JUMP_INIT (stat, _IO_default_stat)
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};
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/* Open a stream that writes into a malloc'd buffer that is expanded as
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necessary. *BUFLOC and *SIZELOC are updated with the buffer's location
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and the number of characters written on fflush or fclose. */
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_IO_FILE *
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open_memstream (bufloc, sizeloc)
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char **bufloc;
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_IO_size_t *sizeloc;
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{
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struct _IO_FILE_memstream *fp;
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char *buf;
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fp = (struct _IO_FILE_memstream *)
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malloc (sizeof (struct _IO_FILE_memstream));
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if (fp == NULL)
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return NULL;
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buf = ALLOC_BUF (_IO_BUFSIZ);
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_IO_init (&fp->_sf._f, 0);
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_IO_JUMPS (&fp->_sf._f) = &_IO_mem_jumps;
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_IO_str_init_static (&fp->_sf._f, buf, _IO_BUFSIZ, buf);
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fp->_sf._f._flags &= ~_IO_USER_BUF;
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fp->_sf._s._allocate_buffer = (_IO_alloc_type) malloc;
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fp->_sf._s._free_buffer = (_IO_free_type) free;
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return &fp->_sf._f;
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}
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static int
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_IO_mem_sync (fp)
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_IO_FILE* fp;
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{
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struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp;
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int res;
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res = _IO_default_sync (fp);
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if (res < 0)
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return res;
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if (fp->_IO_write_ptr == fp->_IO_write_end)
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{
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_IO_str_overflow (fp, '\0');
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--fp->_IO_write_ptr;
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}
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else
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*fp->_IO_write_ptr = '\0';
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*mp->bufloc = fp->_IO_buf_base;
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*mp->sizeloc = _IO_blen (fp);
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return 0;
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}
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static int _IO_mem_close (fp)
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_IO_FILE* fp;
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{
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struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp;
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int res;
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res = _IO_default_close (fp);
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if (res < 0)
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return res;
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*mp->bufloc = (char *) realloc (fp->_IO_buf_base, _IO_blen (fp) + 1);
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if (*mp->bufloc == NULL)
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return -1;
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(*mp->bufloc)[_IO_blen (fp)] = '\0';
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*mp->sizeloc = _IO_blen (fp);
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return 0;
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}
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