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/***
*_freebuf.c - release a buffer from a stream
*
* Copyright (c) 1985-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines _freebuf() - release a buffer from a stream
*
*Revision History:
* 09-19-83 RN initial version
* 02-15-90 GJF Fixed copyright, alignment.
* 03-16-90 GJF Replaced cdecl _LOAD_DS with _CALLTYPE1, added #include
* <cruntime.h> and removed #include <register.h>.
* 07-23-90 SBM Replaced <assertm.h> by <assert.h>
* 10-03-90 GJF New-style function declarator.
* 02-14-92 GJF Replaced _nfile with _nhandle for Win32.
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <file2.h>
#include <assert.h>
#include <internal.h>
#include <stdlib.h>
/***
*void _freebuf(stream) - release a buffer from a stream
*
*Purpose:
* free a buffer if at all possible. free() the space if malloc'd by me.
* forget about trying to free a user's buffer for him; it may be static
* memory (not from malloc), so he has to take care of it. this function
* is not intended for use outside the library.
*
#ifdef MTHREAD
* Multi-thread notes:
* _freebuf() does NOT get the stream lock; it is assumed that the
* caller has already done this.
#endif
*
*Entry:
* FILE *stream - stream to free bufer on
*
*Exit:
* Buffer may be freed.
* No return value.
*
*Exceptions:
*
*******************************************************************************/
void _CALLTYPE1 _freebuf (
REG1 FILE *stream
)
{
assert(stream != NULL);
#ifdef _WIN32_
assert( (unsigned)(stream->_file) < (unsigned)_nhandle );
#else
assert(stream->_file >= 0);
assert(stream->_file < _nfile);
#endif
if (inuse(stream) && mbuf(stream))
{
free(stream->_base);
stream->_flag &= ~_IOMYBUF;
stream->_base = stream->_ptr = NULL;
stream->_cnt = 0;
}
}
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