From 4b3082a34d7200d4b8ac980949bae355fc982c6b Mon Sep 17 00:00:00 2001
From: Reiner Herrmann <reiner@reiner-h.de>
Date: Sun, 9 Apr 2017 01:20:56 +0200
Subject: Minor cleanup and pretty printing

---
 common.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 common.c

(limited to 'common.c')

diff --git a/common.c b/common.c
new file mode 100644
index 0000000..467a92c
--- /dev/null
+++ b/common.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <termios.h>
+#include <unistd.h>
+
+int toggle_nonblocking_input()
+{
+	static struct termios *saved_termios = NULL;
+	int ret = 0;
+
+	if (saved_termios) {
+		/* restore old settings */
+		if ((ret = tcsetattr(STDIN_FILENO, TCSANOW, saved_termios)) < 0) {
+			fprintf(stderr, "Failed restoring termios settings: %s\n", strerror(errno));
+		}
+		free(saved_termios);
+		saved_termios = NULL;
+
+		/* restore cursor */
+		fprintf(stderr, "\033[?25h");
+	} else {
+		struct termios new_termios;
+
+		/* get and backup current settings */
+		saved_termios = malloc(sizeof(struct termios));
+		if (tcgetattr(STDIN_FILENO, saved_termios) < 0) {
+			fprintf(stderr, "Failed retrieving current termios setings: %s\n", strerror(errno));
+			free(saved_termios);
+			saved_termios = NULL;
+			return -1;
+		}
+		memcpy(&new_termios, saved_termios, sizeof(struct termios));
+
+		/* disable echo and canonical mode (line by line input; line editing) */
+		new_termios.c_lflag &= ~(ICANON | ECHO);
+
+		if ((ret = tcsetattr(STDIN_FILENO, TCSANOW, &new_termios)) < 0) {
+			fprintf(stderr, "Failed setting to changed termios: %s\n", strerror(errno));
+		}
+
+		/* disable cursor */
+		fprintf(stderr, "\033[?25l");
+	}
+
+	return ret;
+}
-- 
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