80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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/***
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*_getbuf.c - Get a stream buffer
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*
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* Copyright (c) Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Allocate a buffer and init stream data bases.
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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 <malloc.h>
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#include <internal.h>
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#include <dbgint.h>
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/***
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*_getbuf() - Allocate a buffer and init stream data bases
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*
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*Purpose:
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* Allocates a buffer for a stream and inits the stream data bases.
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*
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* [NOTE 1: This routine assumes the caller has already checked to make
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* sure the stream needs a buffer.
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*
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* [NOTE 2: Multi-thread - Assumes caller has aquired stream lock, if
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* needed.]
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*
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*Entry:
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* FILE *stream = stream to allocate a buffer for
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*
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*Exit:
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* void
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*
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*Exceptions:
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*
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*******************************************************************************/
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void __cdecl _getbuf (
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FILE *str
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)
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{
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FILE *stream;
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_ASSERTE(str != NULL);
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#if !defined (CRTDLL)
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/* force library pre-termination procedure */
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_cflush++;
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#endif /* !defined (CRTDLL) */
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/* Init pointers */
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stream = str;
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/* Try to get a big buffer */
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if (stream->_base = _malloc_crt(_INTERNAL_BUFSIZ))
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{
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/* Got a big buffer */
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stream->_flag |= _IOMYBUF;
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stream->_bufsiz = _INTERNAL_BUFSIZ;
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}
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else {
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/* Did NOT get a buffer - use single char buffering. */
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stream->_flag |= _IONBF;
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stream->_base = (char *)&(stream->_charbuf);
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stream->_bufsiz = 2;
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}
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stream->_ptr = stream->_base;
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stream->_cnt = 0;
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return;
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}
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