126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
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/***
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*_strerr.c - routine for indexing into system error list
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Returns system error message index by errno; conforms to the
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* XENIX standard, much compatibility with 1983 uniforum draft standard.
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*
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*Revision History:
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* 02-24-87 JCR Renamed this routine from "strerror" to "_strerror"
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* for MS. The new "strerror" routine conforms to the
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* ANSI interface.
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* 11-10-87 SKS Remove IBMC20 switch
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 01-05-87 JCR Mthread support
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* 05-31-88 PHG Merged DLL and normal versions
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* 06-06-89 JCR 386 mthread support
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* 11-20-89 GJF Fixed copyright, indents. Removed unreferenced local.
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* Added const attribute to type of message
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* 03-13-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
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* <cruntime.h> and removed #include <register.h>
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* 07-25-90 SBM Removed redundant include (stdio.h)
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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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* 29-11-99 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 <stdlib.h>
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#include <errmsg.h>
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#include <syserr.h>
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#include <string.h>
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#include <tchar.h>
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#include <malloc.h>
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#include <mtdll.h>
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#include <dbgint.h>
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/* Max length of message = user_string(94)+system_string+2 */
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/* [NOTE: The mthread 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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#define _ERRMSGLEN_ 94+_SYS_MSGMAX+2
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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(message) - get system error message
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*
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*Purpose:
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* builds an error message consisting of the users error message
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* (the message parameter), followed by ": ", followed by the system
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* error message (index through errno), followed by a newline. If
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* message is NULL or a null string, returns a pointer to just
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* the system error message.
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*
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*Entry:
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* char *message - user's message to prefix system error message
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*
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*Exit:
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* returns pointer to static memory containing error message.
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* returns NULL if malloc() fails in multi-thread versions.
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*
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*Exceptions:
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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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REG1 const _TCHAR *message
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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 *bldmsg;
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#else
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static _TCHAR bldmsg[_ERRMSGLEN_];
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#endif
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#ifdef _MT
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/* Use per thread buffer area (malloc space, if necessary) */
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/* [NOTE: This buffer is shared between _strerror and streror.] */
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if ( (ptd->_terrmsg == NULL) && ((ptd->_terrmsg =
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_malloc_crt(_ERRMSGLEN_ * sizeof(_TCHAR))) == NULL) )
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return(NULL);
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bldmsg = ptd->_terrmsg;
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#endif
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/* Build the error message */
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bldmsg[0] = '\0';
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if (message && *message) {
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_tcscat( bldmsg, message );
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_tcscat( bldmsg, _T(": "));
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}
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#ifdef _UNICODE
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mbstowcs(bldmsg + wcslen(bldmsg), _sys_err_msg( errno ), _ERRMSGLEN_ - wcslen(bldmsg));
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#else
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strcat( bldmsg, _sys_err_msg( errno ) );
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#endif
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return( _tcscat( bldmsg, _T("\n")) );
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}
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