154 lines
4.4 KiB
C
154 lines
4.4 KiB
C
/***
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*_strerr.c - routine for indexing into system error list
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*
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* Copyright (c) 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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*******************************************************************************/
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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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#include <internal.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 /* _UNICODE */
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#define _terrmsg _errmsg
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#endif /* _UNICODE */
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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 /* _UNICODE */
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char * __cdecl _strerror (
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#endif /* _UNICODE */
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const _TCHAR *message
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)
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{
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const char *sysErrorMsg = NULL;
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_TCHAR *bldmsg;
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_ptiddata ptd = _getptd_noexit();
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if (!ptd)
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return NULL;
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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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_calloc_crt(_ERRMSGLEN_, sizeof(_TCHAR))) == NULL) )
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return(NULL);
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bldmsg = ptd->_terrmsg;
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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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// should leave space for ": \n\0"
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_ERRCHECK(_tcsncat_s( bldmsg, _ERRMSGLEN_, message, _ERRMSGLEN_-4 ));
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_ERRCHECK(_tcscat_s( bldmsg, _ERRMSGLEN_, _T(": ")));
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}
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// We should have extra space for "\n\0"
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sysErrorMsg = _get_sys_err_msg(errno);
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#ifdef _UNICODE
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_ERRCHECK(mbstowcs_s(NULL, bldmsg + wcslen(bldmsg), _ERRMSGLEN_ - wcslen(bldmsg), sysErrorMsg, _ERRMSGLEN_ - wcslen(bldmsg) - 2));
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#else /* _UNICODE */
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_ERRCHECK(strncat_s(bldmsg, _ERRMSGLEN_, sysErrorMsg, _ERRMSGLEN_ - strlen(bldmsg) - 2));
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#endif /* _UNICODE */
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_ERRCHECK(_tcscat_s( bldmsg, _ERRMSGLEN_, _T("\n")));
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return bldmsg;
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}
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/***
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*errno_t _strerror_s(buffer, sizeInTChars, 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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* TCHAR * buffer - Destination buffer.
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* size_t sizeInTChars - Size of the destination buffer.
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* TCHAR * message - user's message to prefix system error message
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*
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*Exit:
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* The error code.
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*
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*Exceptions:
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* Input parameters are validated. Refer to the validation section of the function.
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*
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*******************************************************************************/
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#define _MIN_MSG_LENGTH 5
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#ifdef _UNICODE
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errno_t __cdecl __wcserror_s(
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#else /* _UNICODE */
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errno_t __cdecl _strerror_s(
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#endif /* _UNICODE */
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TCHAR* buffer,
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size_t sizeInTChars,
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const _TCHAR *message
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)
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{
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errno_t e = 0;
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/* validation section */
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_VALIDATE_RETURN_ERRCODE(buffer != NULL, EINVAL);
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_VALIDATE_RETURN_ERRCODE(sizeInTChars > 0, EINVAL);
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buffer[0] = '\0';
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if (message &&
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*message &&
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_tcslen(message) < (sizeInTChars - 2 - _MIN_MSG_LENGTH))
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{
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_ERRCHECK(_tcscpy_s(buffer, sizeInTChars, message));
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_ERRCHECK(_tcscat_s(buffer, sizeInTChars, _T(": ")));
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}
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/* append the error message at the end of the buffer */
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return _tcserror_s(buffer + _tcslen(buffer), sizeInTChars - _tcslen(buffer), errno);
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}
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