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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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perror.c
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C/C++ Source or Header
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1998-06-17
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/***
*perror.c - print system error message
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines perror() - print system error message
* System error message are indexed by errno; conforms to XENIX
* standard, with much compatability with 1983 uniforum draft standard.
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syserr.h>
#include <mtdll.h>
#include <io.h>
#if defined (_M_M68K) || defined (_M_MPPC)
#include <fcntl.h>
#include <share.h>
#endif /* defined (_M_M68K) || defined (_M_MPPC) */
/***
*void perror(message) - print system error message
*
*Purpose:
* prints user's error message, then follows it with ": ", then the system
* error message, then a newline. All output goes to stderr. If user's
* message is NULL or a null string, only the system error message is
* printer. If errno is weird, prints "Unknown error".
*
*Entry:
* const char *message - users message to prefix system error message
*
*Exit:
* Prints message; no return value.
*
*Exceptions:
*
*******************************************************************************/
void __cdecl perror (
REG1 const char *message
)
{
#if defined (_WIN32)
REG2 int fh = 2;
_lock_fh(fh); /* acquire file handle lock */
#endif /* defined (_WIN32) */
if (message && *message)
{
#if defined (_WIN32)
_write_lk(fh,(char *)message,strlen(message));
_write_lk(fh,": ",2);
#else /* defined (_WIN32) */
fprintf(stderr,"%s", (char *)message);
fprintf(stderr,": ");
#endif /* defined (_WIN32) */
}
message = _sys_err_msg( errno );
#if defined (_WIN32)
_write_lk(fh,(char *)message,strlen(message));
_write_lk(fh,"\n",1);
_unlock_fh(fh); /* release file handle lock */
#else /* defined (_WIN32) */
fprintf(stderr,"%s\n", (char *)message);
#endif /* defined (_WIN32) */
}