lib-markup: encode all control characters

Previously only control characters 0-0x35 and 0x7f were encoded as
something graphic.  But unicode has more than that.
So use iswcntrl() to find them all.

Signed-off-by: NeilBrown <neil@brown.name>

diff --git a/lib-markup.c b/lib-markup.c
index 795b69c111333d3bed9b48d3f707e6c74b899aa9..0812443c965e1cb2c216667d05551cb06877bd01 100644 (file)
--- a/lib-markup.c
+++ b/lib-markup.c
@@ -362,6 +362,11 @@ DEF_CMD(render_line)
                        buf_concat(&b, "</>");
                } else if (ch == 0x7f) {
                        buf_concat(&b, "<fg:red>^?</>");
+               } else if (ch >= 0x80 && iswcntrl(ch)) {
+                       /* Extra unicode control */
+                       buf_concat(&b, "<fg:magenta>^");
+                       buf_append(&b, 96 + (ch & 0x1f));
+                       buf_concat(&b, "</>");
                } else
                        buf_append(&b, ch);
                chars++;