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114 lines
3.7 KiB
114 lines
3.7 KiB
/***
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*_getbuf.c - Get a stream buffer
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*
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* Copyright (c) 1987-2001, 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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*Revision History:
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* 11-06-87 JCR Initial version (split off from _filbuf.c)
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* 01-11-88 JCR Moved from mthread/dll only to main code
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* 06-06-88 JCR Optimized _iob2 references
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* 06-10-88 JCR Use near pointer to reference _iob[] entries
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* 07-27-88 GJF Added _cflush++ to force pre-terminator (necessary in
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* case stdout has been redirected to a file and acquires
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* a buffer here, and pre-terminator has not already been
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* forced).
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* 08-25-88 GJF Don't use FP_OFF() macro for the 386
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* 08-28-89 JCR Removed _NEAR_ for 386
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* 02-15-90 GJF _iob[], _iob2[] merge. Also, fixed copyright and
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* indents.
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* 03-16-90 GJF Replaced near cdecl with _CALLTYPE1, added #include
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* <cruntime.h> and removed #include <register.h>. Also,
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* removed some leftover 16-bit support.
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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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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 04-27-93 CFW Change _IONBF size to 2 bytes to hold wide char.
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* 05-11-93 GJF Replaced BUFSIZ with _INTERNAL_BUFSIZ.
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* 11-04-93 SRW Dont call malloc in _NTSUBSET_ version
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* 11-05-93 GJF Merged with NT SDK version (picked up _NTSUBSET_
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* stuff).
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* 04-05-94 GJF #ifdef-ed out _cflush reference for msvcrt*.dll, it
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* is unnecessary.
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* 01-10-95 CFW Debug CRT allocs.
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* 02-06-94 CFW assert -> _ASSERTE.
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* 02-17-95 GJF Merged in Mac version.
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* 05-17-99 PML Remove all Macintosh support.
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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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REG1 FILE *stream;
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_ASSERTE(str != NULL);
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#if !defined(_NTSUBSET_) && !defined(CRTDLL)
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/* force library pre-termination procedure */
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_cflush++;
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#endif
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/* Init pointers */
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stream = str;
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#ifndef _NTSUBSET_
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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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#endif /* _NTSUBSET_ */
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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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#ifndef _NTSUBSET_
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}
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#endif /* _NTSUBSET_ */
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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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