Move tty-specific code to separate compilation scope

include/tty.h

@@ -0,0 +1,24 @@
+#ifndef TTY_H
+#define TTY_H
+
+// ANSI escape char
+#define ESC "\e"
+
+// ANSI Control Sequence Introducer
+#define CSI ESC "["
+
+#define SEQ_CUR_HIDE CSI "?25l"
+#define SEQ_CUR_SHOW CSI "?25h"
+
+
+/**
+ * Hide cursor for a given tty device
+ */
+bool tty_cursor_hide(unsigned int tty);
+
+/**
+ * Show cursor for a given tty device
+ */
+bool tty_cursor_show(unsigned int tty);
+
+#endif

src/tty.c

@@ -0,0 +1,44 @@
+#include "tty.h"
+
+#include <stdio.h>
+
+
+
+// If, for any reason, the user enters MAX_INT (10 chars in decimal) it's fine
+#define STRLEN(str) (sizeof(str)/sizeof(str[0]))
+#define TTY_PATH "/dev/tty"
+#define TTY_PATH_MAXLEN STRLEN( TTY_PATH ) + 10
+
+bool format_tty (char *holder, unsigned int tty) {
+  // sprintf returns -1 on failure
+  return (sprintf (tty_name, TTY_PATH "%u", tty) + 1);
+}
+
+bool write_to_file (const char *path, const char *text) {
+  FILE *file = fopen (path);
+  if (file) {
+    fputs (text);
+
+    fclose (file);
+  }
+
+  return false;
+}
+
+bool tty_action (unsigned int tty, const char *action) {
+  char tty_name[TTY_PATH_MAXLEN];
+
+  return format_tty (tty_name, tty) && write_to_file (tty_name, action);
+}
+
+
+
+
+bool tty_cursor_hide(unsigned int tty) {
+  return tty_action (tty, SEQ_CUR_HIDE);
+}
+
+
+bool tty_cursor_show(unsigned int tty) {
+  return tty_action (tty, SEQ_CUR_SHOW);
+}