watch: Don't attempt to ungetc parts of unknown ANSI escape sequences

If process_ansi encountered an unknown character when processing an ANSI
escape sequence, it would ungetc all the characters read so far, except
for the character just read, and the opening '\033['.  ungetting the
middle of the escape sequence does not produce useful results, and also
relies on the unportable assumption that ungetc works on multiple
characters (which glibc does not support).  Discard the characters
instead.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>

diff --git a/watch.c b/watch.c
index 265daa6de9fff0d99b102567dfb8186388aeaef2..8de12b2c76c2e8020263338674b568017b550a5e 100644 (file)
--- a/watch.c
+++ b/watch.c
@@ -217,8 +217,6 @@ static void process_ansi(FILE * fp)
                        break;
                }
                if ((c < '0' || c > '9') && c != ';') {
-                       while (--i >= 0)
-                               ungetc(buf[i], fp);
                        return;
                }
                buf[i] = (char)c;