wperror.c

C标准库源代码

/***
*wperror.c - print system error message (wchar_t version)
*
*       Copyright (c) 1993-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       defines _wperror() - print wide system error message
*       System error message are indexed by errno.
*
*******************************************************************************/


#include <cruntime.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syserr.h>
#include <mtdll.h>
#include <io.h>
#include <dbgint.h>

/***
*void _wperror(wmessage) - print system error message
*
*Purpose:
*       prints user's error message, then follows it with ": ", then the system
*       error message, then a newline.  All output goes to stderr.  If user's
*       message is NULL or a null string, only the system error message is
*       printer.  If errno is weird, prints "Unknown error".
*
*Entry:
*       const wchar_t *wmessage - users message to prefix system error message
*
*Exit:
*       Prints message; no return value.
*
*Exceptions:
*
*******************************************************************************/

void __cdecl _wperror (
        REG1 const wchar_t *wmessage
        )
{
        REG2 int fh = 2;
        int size;
        char *amessage;

        /* convert WCS string into ASCII string */

        size = wcslen(wmessage) + 1;

        if (NULL == (amessage = (char *)_malloc_crt(size * sizeof(char))))
            return;

        if (0 == (wcstombs(amessage, wmessage, size)))
        {
            _free_crt (amessage);
            return;
        }

        _lock_fh(fh);           /* acquire file handle lock */

        if (amessage && *amessage)
        {
                _write_lk(fh,(char *)amessage,strlen(amessage));
                _write_lk(fh,": ",2);
        }

        _free_crt(amessage);

        amessage = _sys_err_msg( errno );
        _write_lk(fh,(char *)amessage,strlen(amessage));
        _write_lk(fh,"\n",1);

        _unlock_fh(fh);         /* release file handle lock */
}