From 789a877b379cd35c350610be62b971ae00feb542 Mon Sep 17 00:00:00 2001
From: Heghedus Razvan <heghedus.razvan@protonmail.com>
Date: Mon, 7 May 2018 19:30:45 +0300
Subject: Fix crash when using pango markup font

The characters & < > ' " needs to be escaped when using pango markup

Signed-off-by: Heghedus Razvan <heghedus.razvan@gmail.com>
---
 common/pango.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 68 insertions(+), 5 deletions(-)

(limited to 'common/pango.c')

diff --git a/common/pango.c b/common/pango.c
index 658d2876..9437c60d 100644
--- a/common/pango.c
+++ b/common/pango.c
@@ -8,6 +8,68 @@
 #include <string.h>
 #include "log.h"
 
+int escape_markup_text(const char *src, char *dest, int dest_length) {
+	int length = 0;
+
+	while (src[0]) {
+		switch (src[0]) {
+		case '&':
+			length += 5;
+			if (dest && dest_length - length >= 0) {
+				dest += sprintf(dest, "%s", "&amp;");
+			} else {
+				dest_length = -1;
+			}
+			break;
+		case '<':
+			length += 4;
+			if (dest && dest_length - length >= 0) {
+				dest += sprintf(dest, "%s", "&lt;");
+			} else {
+				dest_length = -1;
+			}
+			break;
+		case '>':
+			length += 4;
+			if (dest && dest_length - length >= 0) {
+				dest += sprintf(dest, "%s", "&gt;");
+			} else {
+				dest_length = -1;
+			}
+			break;
+		case '\'':
+			length += 6;
+			if (dest && dest_length - length >= 0) {
+				dest += sprintf(dest, "%s", "&apos;");
+			} else {
+				dest_length = -1;
+			}
+			break;
+		case '"':
+			length += 6;
+			if (dest && dest_length - length >= 0) {
+				dest += sprintf(dest, "%s", "&quot;");
+			} else {
+				dest_length = -1;
+			}
+			break;
+		default:
+			length += 1;
+			if (dest && dest_length - length >= 0) {
+				*(dest++) = *src;
+			} else {
+				dest_length = -1;
+			}
+		}
+		src++;
+	}
+	// if we could not fit the escaped string in dest, return -1
+	if (dest && dest_length == -1) {
+		return -1;
+	}
+	return length;
+}
+
 PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
 		const char *text, int32_t scale, bool markup) {
 	PangoLayout *layout = pango_cairo_create_layout(cairo);
@@ -15,13 +77,14 @@ PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
 	if (markup) {
 		char *buf;
 		GError *error = NULL;
-		if (!sway_assert(pango_parse_markup(
-					text, -1, 0, &attrs, &buf, NULL, &error),
-				"pango_parse_markup '%s' -> error %s", text,
-				error ? error->message : NULL)) {
+		bool result = pango_parse_markup(text, -1, 0, &attrs, &buf,
+				NULL, &error);
+		if (result) {
+			wlr_log(L_ERROR, "pango_parse_markup '%s' -> error %s", text,
+					error->message);
 			return NULL;
 		}
-		pango_layout_set_markup(layout, buf, -1);
+		pango_layout_set_markup(layout, text, -1);
 		free(buf);
 	} else {
 		attrs = pango_attr_list_new();
-- 
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