first working version of uuterm!

- at this point it is purely experimental. only ascii characters are
  visible (using builtin font) although all characters are processed.
- there are known bugs, including crashes.
- there are major missing features.
- but it works. ^_^

1 files changed, 63 insertions, 0 deletions

diff --git a/tty.c b/tty.c
new file mode 100644
index 0000000..8a2ccda
--- /dev/null
+++ b/tty.c
@@ -0,0 +1,63 @@
+/* uuterm, Copyright (C) 2006 Rich Felker; licensed under GNU GPL v2 only */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+
+void uutty_resize(int fd, int w, int h)
+{
+#ifdef TIOCSWINSZ
+	struct winsize ws = { };
+	ws.ws_col = w;
+	ws.ws_row = h;
+	ioctl(fd, TIOCSWINSZ, &ws);
+#endif
+}
+
+/* #define posix_openpt(x) open("/dev/ptmx", x) */
+
+int uutty_open(char **cmd, int w, int h)
+{
+	int ptm, pts;
+	struct stat st;
+
+	if (!cmd || !cmd[0] || stat(cmd[0], &st) < 0
+	 || !S_ISCHR(st.st_mode)
+	 || (ptm = open(cmd[0], O_RDWR|O_NOCTTY)) < 0
+	 || (isatty(ptm) ? 0 : (close(ptm),1)) ) {
+
+		if ((ptm = posix_openpt(O_RDWR|O_NOCTTY)) < 0)
+			return -1;
+		if (grantpt(ptm) < 0 || unlockpt(ptm) < 0) {
+			close(ptm);
+			return -1;
+		}
+
+		switch(fork()) {
+		case -1:
+			close(ptm);
+			return -1;
+		case 0:
+			setsid();
+			pts = open(ptsname(ptm), O_RDWR);
+			close(ptm);
+			dup2(pts, 0);
+			dup2(pts, 1);
+			dup2(pts, 2);
+			if (pts > 2) close(pts);
+			// FIXME............................
+			if (cmd) execvp(cmd[0], cmd);
+			else execl("/bin/sh", "-sh", (char *)0);
+			return 1;
+		}
+	
+		uutty_resize(ptm, w, h);
+	}
+
+	fcntl(ptm, F_SETFL, fcntl(ptm, F_GETFL)|O_NONBLOCK);
+
+	return ptm;
+}