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stdarg.go
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stdarg.go
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package libc
import (
"fmt"
"reflect"
)
type ArgList struct {
cur int
typ interface{}
args []interface{}
}
func (va *ArgList) Start(typ interface{}, rest []interface{}) {
va.cur = 0
va.typ = typ
va.args = rest
}
func (va *ArgList) Args() []interface{} {
return va.args
}
func (va *ArgList) Arg() interface{} {
if va.cur >= len(va.args) {
return nil
}
cur := va.args[va.cur]
va.cur++
return cur
}
func (va *ArgList) ArgUintptr() uintptr {
v := va.Arg()
switch v := v.(type) {
case nil:
return 0
case uintptr:
return v
case int:
return uintptr(v)
case uint:
return uintptr(v)
case int32:
return uintptr(v)
case uint32:
return uintptr(v)
}
rv := reflect.ValueOf(v)
switch rv.Kind() {
case reflect.Ptr, reflect.UnsafePointer:
return rv.Pointer()
}
panic(fmt.Errorf("unsupported type: %T", v))
}
func (va *ArgList) End() {
va.cur = 0
va.typ = nil
va.args = nil
}
func ArgCopy(dst, src *ArgList) {
dst.cur = src.cur
dst.typ = src.typ
dst.args = append([]interface{}{}, src.args...)
}