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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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_strerr.c
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1998-06-17
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/***
*_strerr.c - routine for indexing into system error list
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Returns system error message index by errno; conforms to the
* XENIX standard, much compatibility with 1983 uniforum draft standard.
*
*******************************************************************************/
#include <cruntime.h>
#include <stdlib.h>
#include <errmsg.h>
#include <syserr.h>
#include <string.h>
#include <malloc.h>
#include <mtdll.h>
#include <dbgint.h>
/* Max length of message = user_string(94)+system_string+2 */
/* [NOTE: The mthread error message buffer is shared by both strerror
and _strerror so must be the max length of both. */
#define _ERRMSGLEN_ 94+_SYS_MSGMAX+2
/***
*char *_strerror(message) - get system error message
*
*Purpose:
* builds an error message consisting of the users error message
* (the message parameter), followed by ": ", followed by the system
* error message (index through errno), followed by a newline. If
* message is NULL or a null string, returns a pointer to just
* the system error message.
*
*Entry:
* char *message - user's message to prefix system error message
*
*Exit:
* returns pointer to static memory containing error message.
* returns NULL if malloc() fails in multi-thread versions.
*
*Exceptions:
*
*******************************************************************************/
char * __cdecl _strerror (
REG1 const char *message
)
{
#ifdef _MT
_ptiddata ptd = _getptd();
char *bldmsg;
#else /* _MT */
static char bldmsg[_ERRMSGLEN_];
#endif /* _MT */
#ifdef _MT
/* Use per thread buffer area (malloc space, if necessary) */
/* [NOTE: This buffer is shared between _strerror and streror.] */
if ( (ptd->_errmsg == NULL) && ((ptd->_errmsg =
_malloc_crt(_ERRMSGLEN_)) == NULL) )
return(NULL);
bldmsg = ptd->_errmsg;
#endif /* _MT */
/* Build the error message */
bldmsg[0] = '\0';
if (message && *message) {
strcat( bldmsg, message );
strcat( bldmsg, ": " );
}
strcat( bldmsg, _sys_err_msg( errno ) );
return( strcat( bldmsg, "\n" ) );
}