Use libedit when interacting with tty, which provided history

functionality, etc. as did by GNU bc.

This also fixes an issue where BSDL bc can not handle very long
line.

Reported by:	imp
Reviewed by:	imp

1 files changed, 18 insertions, 0 deletions

diff --git a/usr.bin/bc/bc.y b/usr.bin/bc/bc.y
index b00d140..b00d5ac 100644
--- a/usr.bin/bc/bc.y
+++ b/usr.bin/bc/bc.y
@@ -40,6 +40,7 @@ __FBSDID("$FreeBSD$");
 #include <err.h>
 #include <errno.h>
 #include <getopt.h>
+#include <histedit.h>
 #include <limits.h>
 #include <search.h>
 #include <signal.h>
@@ -1106,6 +1107,13 @@ sigchld(int signo)
 	}
 }
 
+static const char *
+dummy_prompt(void)
+{
+
+        return ("");
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -1173,6 +1181,16 @@ main(int argc, char *argv[])
 			dup(p[1]);
 			close(p[0]);
 			close(p[1]);
+			if (interactive) {
+				el = el_init("bc", stdin, stderr, stderr);
+				hist = history_init();
+				history(hist, &he, H_SETSIZE, 100);
+				el_set(el, EL_HIST, history, hist);
+				el_set(el, EL_EDITOR, "emacs");
+				el_set(el, EL_SIGNAL, 1);
+				el_set(el, EL_PROMPT, dummy_prompt);
+				el_source(el, NULL);
+			}
 		} else {
 			close(STDIN_FILENO);
 			dup(p[0]);