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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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_getbuf.c
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1998-06-17
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/***
*_getbuf.c - Get a stream buffer
*
* Copyright (c) 1987-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Allocate a buffer and init stream data bases.
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <file2.h>
#include <malloc.h>
#include <internal.h>
#include <dbgint.h>
/***
*_getbuf() - Allocate a buffer and init stream data bases
*
*Purpose:
* Allocates a buffer for a stream and inits the stream data bases.
*
* [NOTE 1: This routine assumes the caller has already checked to make
* sure the stream needs a buffer.
*
* [NOTE 2: Multi-thread - Assumes caller has aquired stream lock, if
* needed.]
*
*Entry:
* FILE *stream = stream to allocate a buffer for
*
*Exit:
* void
*
*Exceptions:
*
*******************************************************************************/
void __cdecl _getbuf (
FILE *str
)
{
REG1 FILE *stream;
_ASSERTE(str != NULL);
#if !defined (CRTDLL)
/* force library pre-termination procedure */
_cflush++;
#endif /* !defined (CRTDLL) */
/* Init pointers */
stream = str;
/* Try to get a big buffer */
#ifdef _WIN32
if (stream->_base = _malloc_crt(_INTERNAL_BUFSIZ))
#else /* _WIN32 */
#if defined (_M_MPPC) || defined (_M_M68K)
if (stream->_base = _malloc_crt(BUFSIZ))
#endif /* defined (_M_MPPC) || defined (_M_M68K) */
#endif /* _WIN32 */
{
/* Got a big buffer */
stream->_flag |= _IOMYBUF;
#ifdef _WIN32
stream->_bufsiz = _INTERNAL_BUFSIZ;
#else /* _WIN32 */
#if defined (_M_MPPC) || defined (_M_M68K)
stream->_bufsiz = BUFSIZ;
#endif /* defined (_M_MPPC) || defined (_M_M68K) */
#endif /* _WIN32 */
}
else {
/* Did NOT get a buffer - use single char buffering. */
stream->_flag |= _IONBF;
stream->_base = (char *)&(stream->_charbuf);
#ifdef _WIN32
stream->_bufsiz = 2;
#else /* _WIN32 */
#if defined (_M_MPPC) || defined (_M_M68K)
stream->_bufsiz = 1;
#endif /* defined (_M_MPPC) || defined (_M_M68K) */
#endif /* _WIN32 */
}
stream->_ptr = stream->_base;
stream->_cnt = 0;
return;
}