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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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getw.c
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C/C++ Source or Header
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1998-06-17
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2KB
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62 lines
/***
*getw.c - read a binary word from a stream
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines _getw() - gets a binary integer from a stream
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <dbgint.h>
#include <file2.h>
#include <internal.h>
#include <mtdll.h>
/***
*int _getw(stream) - read an int from a stream
*
*Purpose:
* get n bytes (n=sizeof(int)); OR them together in proper order; high
* byte first. check for EOF between getc's.
* this routine should be machine independent.
*
*Entry:
* FILE *stream - stream to read integer from
*
*Exit:
* returns the int read from the stream
* returns EOF if fails (but this is a legit int value, so
* should test feof() or ferror().
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _getw (
FILE *str
)
{
REG1 FILE *stream;
REG2 int bytecount = sizeof(int);
int word;
char *byteptr = (char *)&word;
int retval;
_ASSERTE(str != NULL);
/* Init stream pointer */
stream = str;
_lock_str(stream);
while (bytecount--)
*byteptr++ = (char)_getc_lk(stream);
retval = ((feof(stream) || ferror(stream)) ? EOF : word);
_unlock_str(stream);
return(retval);
}