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/***
*strerror.c - Contains the strerror C runtime.
*
* Copyright (c) 1987-1993, 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.
*
*Revision History:
* 02-24-87 JCR Module created.
* 12-11-87 JCR Added "_LOAD_DS" to declaration
* 01-04-87 JCR Improved code.
* 01-05-87 JCR Multi-thread support
* 05-31-88 PHG Merge DLL and normal versions
* 06-06-89 JCR 386 mthread support
* 03-16-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
* <cruntime.h> and fixed the copyright. Also, cleaned
* up the formatting a bit.
* 10-04-90 GJF New-style function declarator.
* 07-18-91 GJF Multi-thread support for Win32 [_WIN32_].
* 02-17-93 GJF Changed for new _getptd().
*
*******************************************************************************/
#include <cruntime.h>
#include <errmsg.h>
#include <stdlib.h>
#include <syserr.h>
#include <string.h>
#include <os2dll.h>
#ifdef MTHREAD
#include <malloc.h>
#include <stddef.h>
#endif
/* [NOTE: The mthread error message buffer is shared by both strerror
and _strerror so must be the max length of both. */
#ifdef MTHREAD
/* Max length of message = user_string(94)+system_string+2 */
#define _ERRMSGLEN_ 94+_SYS_MSGMAX+2
#else
/* Max length of message = system_string+2 */
#define _ERRMSGLEN_ _SYS_MSGMAX+2
#endif
/***
*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 * _CRTAPI1 strerror (
int errnum
)
{
#ifdef MTHREAD
#ifdef _CRUISER_
struct _tiddata * tdata;
#else /* ndef _CRUISER_ */
#ifdef _WIN32_
_ptiddata ptd = _getptd();
#else /* ndef _WIN32_ */
#error ERROR - ONLY CRUISER OR WIN32 TARGET SUPPORTED!
#endif /* _WIN32_ */
#endif /* _CRUISER_ */
char *errmsg;
static char errmsg_backup[_SYS_MSGMAX+2];
#else
static char errmsg[_ERRMSGLEN_]; /* Longest errmsg + \0 */
#endif
#ifdef MTHREAD
#ifdef _CRUISER_
tdata = _gettidtab(); /* get tid's data address */
if (tdata->_errmsg == NULL) {
if ( (tdata->_errmsg = malloc(_ERRMSGLEN_)) == NULL)
errmsg = errmsg_backup; /* error: use backup */
else
errmsg = tdata->_errmsg;
}
else
errmsg = tdata->_errmsg;
#else /* ndef _CRUISER_ */
#ifdef _WIN32_
if ( (ptd->_errmsg == NULL) && ((ptd->_errmsg = malloc(_ERRMSGLEN_))
== NULL) )
errmsg = errmsg_backup; /* error: use backup */
else
errmsg = ptd->_errmsg;
#else /* ndef _WIN32_ */
#error ERROR - ONLY CRUISER OR WIN32 TARGET SUPPORTED!
#endif /* _WIN32_ */
#endif /* _CRUISER_ */
#endif
strcpy(errmsg, _sys_err_msg(errnum));
return(errmsg);
}
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