vfscanf.gml

来自「开放源码的编译器open watcom 1.6.0版的源代码」· GML 代码 · 共 102 行

.func vfscanf vfwscanf _uvfscanf
.funcw vfwscanf
#include <stdio.h>
#include <stdarg.h>
int vfscanf( FILE *fp,
             const char *format,
             va_list arg );
.ixfunc2 '&StrIo' &func
.if &'length(&wfunc.) ne 0 .do begin
int vfwscanf( FILE *fp,
              const wchar_t *format,
              va_list arg );
.ixfunc2 '&StrIo' &wfunc
.ixfunc2 '&Wide' &wfunc
.do end
.if &'length(&ufunc.) ne 0 .do begin
int _uvfscanf( FILE *fp,
               const wchar_t *format,
               va_list arg );
.ixfunc2 '&StrIo' &ufunc
.do end
.funcend
.*
.safealt
.*
.desc begin
The &func function scans input from the file designated by
.arg fp
under control of the argument
.arg format.
The
.arg format
string is described under the description of the
.kw scanf
function.
.np
The &func function is equivalent to the
.kw fscanf
function, with a variable argument list replaced with
.arg arg,
which has been initialized using the
.kw va_start
macro.
.if &'length(&wfunc.) ne 0 .do begin
.np
The &wfunc function is identical to &func except that it accepts a
wide-character string argument for
.arg format.
.do end
.if &'length(&ufunc.) ne 0 .do begin
.np
The &ufunc Unicode function is identical to &func except that it
accepts a Unicode string argument for
.arg format
and the input consists of 16-bit Unicode characters.
.do end
.desc end
.*
.return begin
The &func function returns
.kw EOF
if an input failure occurred before any conversion.
Otherwise, the number of input arguments for which values were
successfully scanned and stored is returned.
When a file input error occurs, the
.kw errno
global variable may be set.
.return end
.*
.see begin
.im seevscnf vfscanf
.see end
.*
.exmp begin
#include <stdio.h>
#include <stdarg.h>
.exmp break
void ffind( FILE *fp, char *format, ... )
{
    va_list arglist;

    va_start( arglist, format );
    vfscanf( fp, format, arglist );
    va_end( arglist );
}
.exmp break
void main( void )
{
    int day, year;
    char weekday[10], month[10];
.exmp break
    ffind( stdin,
            "%s %s %d %d",
            weekday, month, &day, &year );
    printf( "\n%s, %s %d, %d\n",
            weekday, month, day, year );
}
.exmp end
.*
.class ISO C99
.system