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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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strerror.c
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1998-06-17
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/***
*strerror.c - Contains the strerror C runtime.
*
* Copyright (c) 1987-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* The strerror runtime accepts an error number as input
* and returns the corresponding error string.
*
* NOTE: The "old" strerror C runtime resides in file _strerr.c
* and is now called _strerror. The new strerror runtime
* conforms to the ANSI standard.
*
*******************************************************************************/
#include <cruntime.h>
#include <errmsg.h>
#include <stdlib.h>
#include <syserr.h>
#include <string.h>
#include <mtdll.h>
#ifdef _MT
#include <malloc.h>
#include <stddef.h>
#endif /* _MT */
#include <dbgint.h>
/* [NOTE: The _MT error message buffer is shared by both strerror
and _strerror so must be the max length of both. */
#ifdef _MT
/* Max length of message = user_string(94)+system_string+2 */
#define _ERRMSGLEN_ 94+_SYS_MSGMAX+2
#else /* _MT */
/* Max length of message = system_string+2 */
#define _ERRMSGLEN_ _SYS_MSGMAX+2
#endif /* _MT */
/***
*char *strerror(errnum) - Map error number to error message string.
*
*Purpose:
* The strerror runtime takes an error number for input and
* returns the corresponding error message string. This routine
* conforms to the ANSI standard interface.
*
*Entry:
* int errnum - Integer error number (corresponding to an errno value).
*
*Exit:
* char * - Strerror returns a pointer to the error message string.
* This string is internal to the strerror routine (i.e., not supplied
* by the user).
*
*Exceptions:
* None.
*
*******************************************************************************/
char * __cdecl strerror (
int errnum
)
{
#ifdef _MT
_ptiddata ptd = _getptd();
char *errmsg;
static char errmsg_backup[_SYS_MSGMAX+2];
#else /* _MT */
static char errmsg[_ERRMSGLEN_]; /* Longest errmsg + \0 */
#endif /* _MT */
#ifdef _MT
if ( (ptd->_errmsg == NULL) && ((ptd->_errmsg =
_malloc_crt(_ERRMSGLEN_))
== NULL) )
errmsg = errmsg_backup; /* error: use backup */
else
errmsg = ptd->_errmsg;
#endif /* _MT */
strcpy(errmsg, _sys_err_msg(errnum));
return(errmsg);
}