import string:*
import mem:*
import io:*

fun system(call_string: string):int {
    var c_call_string = call_string.toCharArray()
    var result  = system(c_call_string)
    delete(c_call_string)
    return result
}
ext fun system(call_string: *char): int
ext fun exit(code: int):void
fun exit() exit(0)

ext fun popen(command: *char, mode: *char): *void
ext fun pclose(file: *void): int
fun from_system_command(command: string, line_size: int): string {
    var command_string = command.toCharArray()
    defer delete(command_string)
    var p = popen(command_string, "r")
    var to_ret = get_line(line_size, p)
    pclose(p)
    return to_ret
}