Disable terminal flow control

This opens up C-o, C-q and C-s for key bindings without C-v.

chat.h

@@ -145,6 +145,7 @@ enum TermEvent {
 	TermPasteEnd,
 };
 void termInit(void);
+void termNoFlow(void);
 void termTitle(const char *title);
 void termMode(enum TermMode mode, bool set);
 enum TermEvent termEvent(char ch);

term.c

@@ -18,6 +18,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <termios.h>
+#include <unistd.h>
 
 #include "chat.h"
 
@@ -28,6 +30,15 @@ void termInit(void) {
 	xterm = term && !strncmp(term, "xterm", 5);
 }
 
+void termNoFlow(void) {
+	struct termios attr;
+	int error = tcgetattr(STDIN_FILENO, &attr);
+	if (error) return;
+	attr.c_iflag &= ~IXON;
+	attr.c_cc[VDISCARD] = _POSIX_VDISABLE;
+	tcsetattr(STDIN_FILENO, TCSANOW, &attr);
+}
+
 void termTitle(const char *title) {
 	if (!xterm) return;
 	printf("\33]0;%s\33\\", title);

ui.c

@@ -189,6 +189,7 @@ void uiInit(void) {
 	cbreak();
 	noecho();
 	termInit();
+	termNoFlow();
 	colorInit();
 	ui.status = newwin(1, COLS, 0, 0);
 	ui.input = newpad(1, 512);