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