atrf-path: accept keyboard input both from stdin and SDL

- gui.c (old_term, restore_term, raw, get_key): raw and non-blocking
  console input
- gui,c (gui): accept console input in addition to keypressed in the
  SDL window

tools/atrf-path/gui.c

@@ -15,6 +15,9 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <string.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <errno.h>
 
 #include "SDL.h"
 #include "SDL_gfxPrimitives.h"
@@ -213,6 +216,61 @@ static void draw_dumps(SDL_Surface *s, int cont_tx)
 }
 
 
+/* ----- Console input ----------------------------------------------------- */
+
+
+static struct termios old_term;
+
+
+static void restore_term(void)
+{
+	if (tcsetattr(0, TCSAFLUSH, &old_term) < 0)
+		perror("tcsetattr");
+}
+
+
+static void raw(void)
+{
+	struct termios term;
+
+	if (tcgetattr(0, &old_term) < 0) {
+		perror("tcgetattr");
+		exit(1);
+	}
+	term = old_term;
+	cfmakeraw(&term);
+	if (tcsetattr(0, TCSAFLUSH, &term) < 0) {
+		perror("tcsetattr");
+		exit(1);
+	}
+	atexit(restore_term);
+	if (fcntl(0, F_SETFL, O_NONBLOCK) < 0) {
+		perror("fcntl");
+		exit(1);
+	}
+}
+
+
+static char get_key(void)
+{
+	ssize_t got;
+        char ch;
+
+	got = read(0, &ch, 1);
+	if (got == 1)
+		return ch;
+	if (got >= 0) {
+		fprintf(stderr, "unexpected read() return value %d\n",
+		    (int) got);
+		exit(1);
+	}
+	if (errno == EAGAIN)
+		return 0;
+	perror("read");
+	exit(1);
+}
+
+
 /* --- temporarily, for optimizing --- */
 
 #if 0
@@ -264,6 +322,8 @@ int gui(const struct sweep *sweep, int sweeps)
 	}
 	atexit(SDL_Quit);
 
+	raw();
+
 	surf = SDL_SetVideoMode(XRES, YRES, 0, SDL_SWSURFACE);
 	if (!surf) {
 		fprintf(stderr, "SDL_SetVideoMode: %s\n", SDL_GetError());
@@ -314,6 +374,30 @@ int gui(const struct sweep *sweep, int sweeps)
 				break;
 			}
 
+		switch (get_key()) {
+		case 'F':
+		case 'f':
+			if (cycle && fail < 0)
+				return -1;
+			break;
+		case 'P':
+		case 'p':
+			if (cycle && !fail)
+				return 1;
+			break;
+		case 'D':
+		case 'd':
+			if (cycle)
+				dump(sweep, res);
+			break;
+		case 'Q':
+		case 'q':
+		case 3: /* Ctrl-C */
+			return 0;
+		default:
+			break;
+		}
+
 		tstart();
 		fail = do_sweep(sweep, res);
 		tstop();