vprintf.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 99 行

.func vprintf vwprintf _uvprintf
.funcw vwprintf
#include <stdarg.h>
#include <stdio.h>
int vprintf( const char *format, va_list arg );
.ixfunc2 '&StrIo' &func
.if &'length(&wfunc.) ne 0 .do begin
#include <stdarg.h>
#include <wchar.h>
int vwprintf( const wchar_t *format, va_list arg );
.ixfunc2 '&StrIo' &wfunc
.ixfunc2 '&Wide' &wfunc
.do end
.if &'length(&ufunc.) ne 0 .do begin
int _uvprintf( const wchar_t *format, va_list arg );
.ixfunc2 '&StrIo' &ufunc
.do end
.funcend
.*
.safealt
.*
.desc begin
The &func function writes output to the file
.kw stdout
under control of the argument
.arg format.
The
.arg format
string is described under the description of the
.kw printf
function.
The &func function is equivalent to the
.kw printf
function, with the variable argument list replaced with
.arg arg,
which has been initialized by 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 writes Unicode characters to the file
.kw stdout.
.do end
.desc end
.*
.return begin
The &func function returns the number of characters written, or a
negative value if an output error occurred.
.if &'length(&wfunc.) ne 0 .do begin
The &wfunc function returns the number of wide characters written, or
a negative value if an output error occurred.
.do end
.im errnoref
.return end
.*
.see begin
.im seevprtf vprintf
.see end
.*
.exmp begin
.blktext begin
The following shows the use of &func in a general error message
routine.
.blktext end
.blkcode begin
#include <stdio.h>
#include <stdarg.h>
.exmp break
void errmsg( char *format, ... )
{
    va_list arglist;

    printf( "Error: " );
    va_start( arglist, format );
    vprintf( format, arglist );
    va_end( arglist );
}
.exmp break
void main( void )
{
    errmsg( "%s %d %s", "Failed", 100, "times" );
}
.blkcode end
.exmp output
Error: Failed 100 times
.exmp end
.*
.class ANSI
.system