initial

1 files changed, 116 insertions, 0 deletions

diff --git a/other/b-scan/tmp/src/tty.c b/other/b-scan/tmp/src/tty.c
new file mode 100644
index 0000000..5c99b7f
--- /dev/null
+++ b/other/b-scan/tmp/src/tty.c
@@ -0,0 +1,116 @@
+/*
+ * most of this stuff is ripped from solar's excelent john-1.6 source
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <termios.h>
+
+static int tty_fd = 0;
+static int tty_buf = -1;
+static struct termios saved_ti;
+
+
+/*
+ *  Reads a character, returns -1 if no data available or on error.
+ */
+int
+tty_getchar ()
+{
+    int c;
+
+    /* 
+     * process buffer first
+     */
+    if (tty_buf != -1)
+    {
+        c = tty_buf;
+        tty_buf = -1;
+        return (c);
+    }
+
+    if (tty_fd)
+    {
+        c = 0;
+        if (read (tty_fd, &c, 1) > 0)
+            return c;
+    }
+
+    return (-1);
+}
+
+/*
+ * check if someone pressed a key
+ * Actually we do a read on the fd and store the result in a buffer
+ * todo: check with ioctl if data is pending
+ * return 1 is data is pending, 0 if not
+ */
+int
+tty_ischar ()
+{
+    if (tty_buf != -1)
+        return (1);
+
+    if ((tty_buf = tty_getchar ()) != -1)
+        return (1);
+
+    return (0);
+}
+
+
+/*
+ * Restores the terminal parameters and closes the file descriptor.
+ */
+void
+tty_done ()
+{
+    int fd;
+
+    if (!tty_fd)
+        return;
+
+    fd = tty_fd;
+    tty_fd = 0;
+    tcsetattr (fd, TCSANOW, &saved_ti);
+
+    close (fd);
+}
+
+
+/* 
+ * Initializes the terminal for unbuffered non-blocking input. Also registers
+ * tty_done() via atexit().
+ */
+void
+tty_init ()
+{
+    int fd;
+    struct termios ti;
+
+    if (tty_fd)
+        return;
+
+    if ((fd = open ("/dev/tty", O_RDONLY | O_NONBLOCK)) < 0)
+        return;
+
+    if (tcgetpgrp (fd) != getpid ())
+    {
+        close (fd);
+        return;
+    }
+
+    tcgetattr (fd, &ti);
+    saved_ti = ti;
+    ti.c_lflag &= ~(ICANON | ECHO);
+    ti.c_cc[VINTR] = 3;         /* CTRL-C is INTR */
+    ti.c_cc[VMIN] = 1;
+    ti.c_cc[VTIME] = 0;
+    tcsetattr (fd, TCSANOW, &ti);
+
+    tty_fd = fd;
+
+    atexit (tty_done);
+}