123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/***
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*strerror.c - Contains the strerror C runtime.
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*
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* Copyright (c) 1987-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* The strerror runtime accepts an error number as input
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* and returns the corresponding error string.
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*
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* NOTE: The "old" strerror C runtime resides in file _strerr.c
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* and is now called _strerror. The new strerror runtime
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* conforms to the ANSI standard.
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*
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*Revision History:
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* 02-24-87 JCR Module created.
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 01-04-87 JCR Improved code.
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* 01-05-87 JCR Multi-thread support
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* 05-31-88 PHG Merge DLL and normal versions
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* 06-06-89 JCR 386 mthread support
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* 03-16-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
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* <cruntime.h> and fixed the copyright. Also, cleaned
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* up the formatting a bit.
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* 10-04-90 GJF New-style function declarator.
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* 07-18-91 GJF Multi-thread support for Win32 [_WIN32_].
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* 02-17-93 GJF Changed for new _getptd().
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 09-06-94 CFW Remove Cruiser support.
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* 09-06-94 CFW Replace MTHREAD with _MT.
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* 01-10-95 CFW Debug CRT allocs.
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* 11-24-99 GB Added support for wide char by adding wcserror()
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <errmsg.h>
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#include <stdlib.h>
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#include <syserr.h>
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#include <string.h>
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#include <mtdll.h>
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#include <tchar.h>
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#ifdef _MT
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#include <malloc.h>
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#include <stddef.h>
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#endif
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#include <dbgint.h>
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/* [NOTE: The _MT error message buffer is shared by both strerror
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and _strerror so must be the max length of both. */
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#ifdef _MT
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/* Max length of message = user_string(94)+system_string+2 */
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#define _ERRMSGLEN_ 94+_SYS_MSGMAX+2
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#else
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/* Max length of message = system_string+2 */
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#define _ERRMSGLEN_ _SYS_MSGMAX+2
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#endif
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#ifdef _UNICODE
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#define _terrmsg _werrmsg
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#else
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#define _terrmsg _errmsg
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#endif
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/***
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*char *strerror(errnum) - Map error number to error message string.
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*
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*Purpose:
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* The strerror runtime takes an error number for input and
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* returns the corresponding error message string. This routine
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* conforms to the ANSI standard interface.
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*
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*Entry:
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* int errnum - Integer error number (corresponding to an errno value).
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*
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*Exit:
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* char * - Strerror returns a pointer to the error message string.
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* This string is internal to the strerror routine (i.e., not supplied
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* by the user).
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*
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*Exceptions:
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* None.
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*
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*******************************************************************************/
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#ifdef _UNICODE
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wchar_t * cdecl _wcserror(
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#else
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char * __cdecl strerror (
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#endif
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int errnum
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)
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{
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#ifdef _MT
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_ptiddata ptd = _getptd();
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_TCHAR *errmsg;
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static _TCHAR errmsg_backup[_SYS_MSGMAX+2];
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#else
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static _TCHAR errmsg[_ERRMSGLEN_]; /* Longest errmsg + \0 */
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#endif
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#ifdef _MT
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if ( (ptd->_terrmsg == NULL) && ((ptd->_terrmsg =
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_malloc_crt(_ERRMSGLEN_ * sizeof(_TCHAR)))
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== NULL) )
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errmsg = errmsg_backup; /* error: use backup */
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else
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errmsg = ptd->_terrmsg;
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#endif
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#ifdef _UNICODE
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mbstowcs(errmsg, _sys_err_msg(errnum), _ERRMSGLEN_);
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#else
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strcpy(errmsg, _sys_err_msg(errnum));
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#endif
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return(errmsg);
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}
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