From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 2 Sep 2011 03:28:17 +0000 (-0700)
Subject: We can't save escape characters.
X-Git-Url: http://git.tdb.fi/?p=ext%2Fsubsurface.git;a=commitdiff_plain;h=bafc7e771ed3f7cfa2589772a7ab66821c0bab75

We can't save escape characters.

I think it should be legal xml, but whatever.  libxml2 is very unhappy,
and complains when loading - even if I escape them.  So let's just
replace the low escape characters with '?'.

The only thing to ever care was my test-case, I suspect.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/save-xml.c b/save-xml.c
index cd7bad2..b91e24e 100644
--- a/save-xml.c
+++ b/save-xml.c
@@ -44,6 +44,10 @@ static void show_pressure(FILE *f, pressure_t pressure, const char *pre, const c
  * We're outputting utf8 in xml.
  * We need to quote the characters <, >, &.
  *
+ * Technically I don't think we'd necessarily need to quote the control
+ * characters, but at least libxml2 doesn't like them. It doesn't even
+ * allow them quoted. So we just skip them and replace them with '?'.
+ *
  * Nothing else (and if we ever do this using attributes, we'd need to
  * quote the quotes we use too).
  */
@@ -60,6 +64,11 @@ static void quote(FILE *f, const char *text)
 		case 0:
 			escape = NULL;
 			break;
+		case 1 ... 8:
+		case 11: case 12:
+		case 14 ... 31:
+			escape = "?";
+			break;
 		case '<':
 			escape = "&lt;";
 			break;