[CLIENTHACK] Remove xchat's + and - on each msg

This patch drops CAPAB setting in 005 message from server to client.
Doing this xchat does not start the mode that prepends a + or a - at the
beginning of PRIVMSGS.

src/irc.c

@@ -412,6 +412,12 @@ int irc_dispatch_server(bip_t *bip, struct link_server *server,
 
 	} else if (LINK(server)->s_state == IRCS_CONNECTING) {
 		ret = OK_FORGET;
+		if (irc_line_elem_equals(line, 0, "005")) {
+			int i;
+			for (i = 0; i < irc_line_count(line); i++)
+				if (irc_line_elem_equals(line, i, "CAPAB"))
+					irc_line_drop(line, i);
+		}
 		if (irc_line_elem_equals(line, 0, "NOTICE")) {
 		} else if (irc_line_elem_equals(line, 0, "376")) {
 							/* end of motd */

src/line.c

@@ -130,6 +130,11 @@ const char *irc_line_elem(struct line *line, int elem)
 	return array_get(&line->words, elem);
 }
 
+void irc_line_drop(struct line *line, int elem)
+{
+	free(array_drop(&line->words, elem));
+}
+
 int irc_line_elem_equals(struct line *line, int elem, const char *cmp)
 {
 	return !strcmp(irc_line_elem(line, elem), cmp);

src/line.h

@@ -100,5 +100,6 @@ char *irc_line_pop(struct line *l);
 int irc_line_elem_equals(struct line *line, int elem, const char *cmp);
 int irc_line_elem_case_equals(struct line *line, int elem, const char *cmp);
 void irc_line_free_args(char **elemv, int elemc);
+void irc_line_drop(struct line *line, int elem);
 
 #endif

src/util.c

@@ -771,6 +771,20 @@ void array_ensure(array_t *a, int index)
 	a->elemc = index + 1;
 }
 
+void *array_drop(array_t *a, int index)
+{
+	int i;
+	void *ret;
+
+	assert(a && array_includes(a, index));
+
+	ret = a->elemv[index];
+	for (i = index; i < array_count(a) - 1; i++)
+		a->elemv[i] = a->elemv[i + 1];
+	a->elemc--;
+	return ret;
+}
+
 array_t *array_extract(array_t *a, int index, int upto)
 {
 	array_t *ret;

src/util.h

@@ -185,6 +185,7 @@ void array_ensure(array_t *a, int index);
 array_t *array_extract(array_t *a, int index, int upto);
 void array_deinit(array_t *a);
 void array_free(array_t *a);
+void *array_drop(array_t *a, int index);
 static inline int array_count(array_t *a)
 {
 	assert(a);