/* Copyright (C) 1995, 1996, 1997 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 Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "libioP.h" #include "strfile.h" #include <stdio.h> #include <stdlib.h> struct _IO_FILE_memstream { _IO_strfile _sf; char **bufloc; _IO_size_t *sizeloc; }; static int _IO_mem_sync __P ((_IO_FILE* fp)); static void _IO_mem_finish __P ((_IO_FILE* fp, int)); static const struct _IO_jump_t _IO_mem_jumps = { JUMP_INIT_DUMMY, JUMP_INIT (finish, _IO_mem_finish), JUMP_INIT (overflow, _IO_str_overflow), JUMP_INIT (underflow, _IO_str_underflow), JUMP_INIT (uflow, _IO_default_uflow), JUMP_INIT (pbackfail, _IO_str_pbackfail), JUMP_INIT (xsputn, _IO_default_xsputn), JUMP_INIT (xsgetn, _IO_default_xsgetn), JUMP_INIT (seekoff, _IO_str_seekoff), JUMP_INIT (seekpos, _IO_default_seekpos), JUMP_INIT (setbuf, _IO_default_setbuf), JUMP_INIT (sync, _IO_mem_sync), JUMP_INIT (doallocate, _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) }; /* Open a stream that writes into a malloc'd buffer that is expanded as necessary. *BUFLOC and *SIZELOC are updated with the buffer's location and the number of characters written on fflush or fclose. */ _IO_FILE * open_memstream (bufloc, sizeloc) char **bufloc; _IO_size_t *sizeloc; { struct locked_FILE { struct _IO_FILE_memstream fp; #ifdef _IO_MTSAFE_IO _IO_lock_t lock; #endif } *new_f; char *buf; new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); if (new_f == NULL) return NULL; #ifdef _IO_MTSAFE_IO new_f->fp._sf._sbf._f._lock = &new_f->lock; #endif buf = malloc (_IO_BUFSIZ); if (buf == NULL) return NULL; _IO_init (&new_f->fp._sf._sbf._f, 0); _IO_JUMPS (&new_f->fp._sf._sbf._f) = &_IO_mem_jumps; _IO_str_init_static (&new_f->fp._sf._sbf._f, buf, _IO_BUFSIZ, buf); new_f->fp._sf._sbf._f._flags &= ~_IO_USER_BUF; new_f->fp._sf._s._allocate_buffer = (_IO_alloc_type) malloc; new_f->fp._sf._s._free_buffer = (_IO_free_type) free; new_f->fp.bufloc = bufloc; new_f->fp.sizeloc = sizeloc; return &new_f->fp._sf._sbf._f; } static int _IO_mem_sync (fp) _IO_FILE* fp; { struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp; int res; res = _IO_default_sync (fp); if (res < 0) return res; if (fp->_IO_write_ptr == fp->_IO_write_end) { _IO_str_overflow (fp, '\0'); --fp->_IO_write_ptr; } else *fp->_IO_write_ptr = '\0'; *mp->bufloc = fp->_IO_write_base; *mp->sizeloc = fp->_IO_write_ptr - fp->_IO_write_base; return 0; } static void _IO_mem_finish (fp, dummy) _IO_FILE* fp; int dummy; { struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp; *mp->bufloc = (char *) realloc (fp->_IO_write_base, fp->_IO_write_ptr - fp->_IO_write_base + 1); if (*mp->bufloc != NULL) { (*mp->bufloc)[fp->_IO_write_ptr - fp->_IO_write_base] = '\0'; *mp->sizeloc = fp->_IO_write_ptr - fp->_IO_write_base; } fp->_IO_buf_base = NULL; _IO_default_finish (fp, 0); }