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package pointer
import (
"fmt"
"os"
)
// We keep the last input char to handle a pain point in the funge-98 spec :
// when reading from the decimal input you need to read until you encounter a
// non numeric char, but not drop it
var defaultInputLastChar *int = nil
func DefaultCharacterInput() (int, error) {
if defaultInputLastChar != nil {
c := *defaultInputLastChar
defaultInputLastChar = nil
return c, nil
}
b := make([]byte, 1)
i, err := os.Stdin.Read(b)
if err != nil {
return 0, fmt.Errorf("Error in DefaultCharacterInput { b: %c, i: %d, err: %w }", b[0], i, err)
}
return int(b[0]), nil
}
func DefaultDecimalInput() (int, error) {
var v int
for {
c, err := DefaultCharacterInput()
if err != nil {
return 0, err
}
if c >= '0' && c <= '9' {
v = c - '0'
break
}
}
for {
c, err := DefaultCharacterInput()
if err != nil {
break
}
if c >= '0' && c <= '9' {
v = v*10 + c - '0'
} else {
defaultInputLastChar = &c
break
}
}
return v, nil
}
func DefaultCharacterOutput(c int) {
fmt.Printf("%c", c)
}
func DefaultDecimalOutput(c int) {
fmt.Printf("%d ", c)
}
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