4coder-non-source/test_data/lots_of_files/_getbuf.c

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2023-09-30 01:17:40 +00:00
/***
*_getbuf.c - Get a stream buffer
*
* Copyright (c) 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
)
{
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 */
if (stream->_base = _malloc_crt(_INTERNAL_BUFSIZ))
{
/* Got a big buffer */
stream->_flag |= _IOMYBUF;
stream->_bufsiz = _INTERNAL_BUFSIZ;
}
else {
/* Did NOT get a buffer - use single char buffering. */
stream->_flag |= _IONBF;
stream->_base = (char *)&(stream->_charbuf);
stream->_bufsiz = 2;
}
stream->_ptr = stream->_base;
stream->_cnt = 0;
return;
}