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9gc: add -e to disable echo

--- a/9gc.c

+++ b/9gc.c

@@ -10,6 +10,7 @@

 #include <sys/select.h>

 #include <sys/socket.h>

 #include <sys/types.h>

+#include <termios.h>

 #include <unistd.h>

 #include "c9.h"

 #include "parg.h"

@@ -370,11 +371,12 @@

 main(int argc, char **argv)

 {

 	struct parg_state ps;

+	struct termios t;

 	C9aux *a;

-	int c;

+	int c, noecho;

 	parg_init(&ps);

-

+	noecho = 0;

 	while ((c = parg_getopt(&ps, argc, argv, "dh")) >= 0) {

 		switch (c) {

 		case 1:

@@ -387,8 +389,11 @@

 		case 'j':

 			printjoin = 1;

 			break;

+		case 'e':

+			noecho = 1;

+			break;

 		case 'h':

-			fprintf(stderr, "usage: 9gc NICKNAME\n");

+			fprintf(stderr, "usage: 9gc [-j] [-e] NICKNAME\n");

 			return 0;

 			break;

 		case '?':

@@ -409,6 +414,11 @@

 	if ((a = registry()) == NULL)

 		return 1;

+	if (noecho && tcgetattr(0, &t) == 0) {

+		t.c_lflag &= ~ECHO;

+		tcsetattr(STDIN_FILENO, TCSANOW, &t);

+	}

+

 	while (chatrw(a) == 0 && wrsend(a) == 0);

 	return 0;