+
+/*
+ * Escapes ampersand, less-than, greater-than, single-quote, and double-quote
+ * characters with the corresponding Pango markup strings if markup is enabled.
+ * See the glib implementation:
+ * https://git.gnome.org/browse/glib/tree/glib/gmarkup.c?id=03db1f455b4265654e237d2ad55464b4113cba8a#n2142
+ *
+ */
+void maybe_escape_markup(char *text, char **buffer) {
+ if (markup_format == M_NONE) {
+ *buffer += sprintf(*buffer, "%s", text);
+ return;
+ }
+ for (; *text != '\0'; text++) {
+ switch (*text) {
+ case '&':
+ *buffer += sprintf(*buffer, "%s", "&");
+ break;
+ case '<':
+ *buffer += sprintf(*buffer, "%s", "<");
+ break;
+ case '>':
+ *buffer += sprintf(*buffer, "%s", ">");
+ break;
+ case '\'':
+ *buffer += sprintf(*buffer, "%s", "'");
+ break;
+ case '"':
+ *buffer += sprintf(*buffer, "%s", """);
+ break;
+ default:
+ if ((0x1 <= *text && *text <= 0x8) ||
+ (0xb <= *text && *text <= 0xc) ||
+ (0xe <= *text && *text <= 0x1f)) {
+ *buffer += sprintf(*buffer, "&#x%x;", *text);
+ } else {
+ *(*buffer)++ = *text;
+ }
+ break;
+ }
+ }
+}