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94 lines
2.8 KiB
94 lines
2.8 KiB
/***
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*getw.c - read a binary word from a stream
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines _getw() - gets a binary integer from a stream
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*
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*Revision History:
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* 09-02-83 RN initial version
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* 11-09-87 JCR Multi-thread support
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 01-13-88 JCR Removed unnecessary calls to mthread fileno/feof/ferror
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* 05-27-88 PHG Merged DLL and normal versions
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* Fixed bug if EOF occurs in middle of word being read
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* 06-15-88 JCR Near reference to _iob[] entries; improve REG variables
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* 08-24-88 GJF Don't use FP_OFF() macro for the 386
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* 08-18-89 GJF Clean up, now specific to OS/2 2.0 (i.e., 386 flat
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* model). Also fixed copyright and indents.
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* 02-15-90 GJF Fixed copyright
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* 03-19-90 GJF Made calling type _CALLTYPE1, added #include
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* <cruntime.h> and removed #include <register.h>.
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* 07-23-90 SBM Replaced <assertm.h> by <assert.h>
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* 08-13-90 SBM Compiles cleanly with -W3
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* 10-02-90 GJF New-style function declarator.
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* 01-21-91 GJF ANSI naming.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 09-06-94 CFW Replace MTHREAD with _MT.
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* 02-06-94 CFW assert -> _ASSERTE.
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* 03-07-95 GJF _[un]lock_str macros now take FILE * arg.
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* 03-02-98 GJF Exception-safe locking.
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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 <dbgint.h>
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#include <file2.h>
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#include <internal.h>
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#include <mtdll.h>
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/***
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*int _getw(stream) - read an int from a stream
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*
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*Purpose:
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* get n bytes (n=sizeof(int)); OR them together in proper order; high
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* byte first. check for EOF between getc's.
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* this routine should be machine independent.
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*
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*Entry:
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* FILE *stream - stream to read integer from
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*
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*Exit:
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* returns the int read from the stream
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* returns EOF if fails (but this is a legit int value, so
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* should test feof() or ferror().
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _getw (
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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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REG2 int bytecount = sizeof(int);
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int word;
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char *byteptr = (char *)&word;
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int retval;
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_ASSERTE(str != NULL);
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/* Init stream pointer */
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stream = str;
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#ifdef _MT
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_lock_str(stream);
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__try {
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#endif
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while (bytecount--)
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*byteptr++ = (char)_getc_lk(stream);
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retval = ((feof(stream) || ferror(stream)) ? EOF : word);
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#ifdef _MT
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}
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__finally {
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_unlock_str(stream);
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}
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#endif
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return(retval);
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}
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