ldlinux: get_key() requires raw access to user input

commit 4503e6260c0 ("ldlinux: Use stdcon instead of rawcon for the
console") broke get_key() because it was no longer possible to read
raw data from stdin. Provide a new function raw_read() that will
return user input a character at a time.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/com32/libutil/ansiraw.c b/com32/libutil/ansiraw.c
index 2afd48a7..b67768c5 100644
--- a/com32/libutil/ansiraw.c
+++ b/com32/libutil/ansiraw.c
@@ -47,6 +47,7 @@ void console_ansi_raw(void)
 
 #include <stdio.h>
 #include <termios.h>
+#include <unistd.h>
 
 static struct termios original_termios_settings;
 
@@ -82,4 +83,22 @@ void console_ansi_raw(void)
     tcsetattr(0, TCSAFLUSH, &tio);
 }
 
+int raw_read(int fd, void *buf, size_t count)
+{
+	struct termios tio, rtio;
+	int rv;
+
+	tcgetattr(fd, &tio);
+
+	cfmakeraw(&rtio);
+	tcsetattr(fd, 0, &rtio);
+
+	rv = read(fd, buf, count);
+
+	/* Restore settings */
+	tcsetattr(fd, 0, &tio);
+
+	return rv;
+}
+
 #endif