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add read-char procedure

This commit is contained in:
Yuichi Nishiwaki 2014-01-13 00:51:30 +09:00
parent 1c14feffa4
commit 4a87120eb6
1 changed files with 28 additions and 0 deletions
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28
src/port.c
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@ -352,6 +352,29 @@ pic_port_close_port(pic_state *pic)
return pic_none_value();
}
static pic_value
pic_port_read_char(pic_state *pic)
{
char c;
struct pic_port *port = pic_stdin(pic);
pic_get_args(pic, "|p", &port);
if ((port->flags & PIC_PORT_IN) == 0) {
pic_error(pic, "read-char: expected input-port");
}
if (port->status != PIC_PORT_OPEN) {
pic_error(pic, "read-char: expected open port");
}
if ((c = fgetc(port->file)) == EOF) {
return pic_eof_object();
}
else {
return pic_char_value(c);
}
}
void
pic_init_port(pic_state *pic)
{
@ -371,6 +394,11 @@ pic_init_port(pic_state *pic)
pic_defun(pic, "close-port", pic_port_close_port);
pic_defun(pic, "close-input-port", pic_port_close_port);
pic_defun(pic, "close-output-port", pic_port_close_port);
/* input */
pic_defun(pic, "read-char", pic_port_read_char);
/* write */
pic_defun(pic, "newline", pic_port_newline);
DEFLIBRARY(pic, "(scheme write)")