Fix display of overlong lines containing non-ASCII bytes.

Also fixes a crash reported by Hiltjo Posthuma <hiltjo at codemadness
dot org>, though in a different way than with the patch he sent.
OK florian@ bcallah@

diff --git a/usr.bin/mg/display.c b/usr.bin/mg/display.c
index 7af723c..c26f093 100644 (file)
--- a/usr.bin/mg/display.c
+++ b/usr.bin/mg/display.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: display.c,v 1.47 2015/04/03 22:10:29 bcallah Exp $    */
+/*     $OpenBSD: display.c,v 1.48 2017/07/06 19:27:37 schwarze Exp $   */
 
 /* This file is in the public domain. */
 
@@ -366,10 +366,16 @@ vtpute(int c)
        } else if (ISCTRL(c) != FALSE) {
                vtpute('^');
                vtpute(CCHR(c));
-       } else {
+       } else if (isprint(c)) {
                if (vtcol >= 0)
                        vp->v_text[vtcol] = c;
                ++vtcol;
+       } else {
+               char bf[5], *cp;
+
+               snprintf(bf, sizeof(bf), "\\%o", c);
+               for (cp = bf; *cp != '\0'; cp++)
+                       vtpute(*cp);
        }
 }