From 21396186ea84fee55a07f47baff3faeb61723143 Mon Sep 17 00:00:00 2001
From: Stathis Kamperis <ekamperi@auth.gr>
Date: Mon, 6 Aug 2007 15:12:33 +0300
Subject: [PATCH] Initial import of termios/echo_off.c

---
 termios/echo_off.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 termios/echo_off.c

diff --git a/termios/echo_off.c b/termios/echo_off.c
new file mode 100644
index 0000000..d4953a7
--- /dev/null
+++ b/termios/echo_off.c
@@ -0,0 +1,53 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+
+#define PASSLEN 64
+
+/* function prototypes */
+void diep(const char *s);
+
+int main(int argc, char *argv[])
+{
+    struct termios oldt, newt;
+    char password[PASSLEN];
+    int fd;
+
+    /* check argument count */
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s tty\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+
+    /* open terminal device */
+    if ((fd = open(argv[1], O_RDONLY | O_NOCTTY) == -1))
+        diep("open");
+
+    /* get current termios structure */
+    if (tcgetattr(fd, &oldt) == -1)
+        diep("tcgetattr");
+
+    /* set new termios structure */
+    newt = oldt;
+    newt.c_lflag &= ~ECHO;     /* disable echoing */
+    newt.c_lflag |= ECHONL;    /* echo NL even if ECHO is off */
+
+    if (tcsetattr(fd, TCSANOW, &newt) == -1)
+        diep("tcsetattr");
+
+    /* prompt for password and get it*/
+    printf("Password: ");
+    scanf("%64s", password);
+
+    /* restole old termios structure */
+    if (tcsetattr(fd, TCSANOW, &oldt) == -1)
+        diep("tcsetattr");
+
+    return EXIT_SUCCESS;
+}
+
+void diep(const char *s) {
+    perror(s);
+    exit(EXIT_FAILURE);
+}
-- 
2.11.4.GIT