Add basic pty console

This is good enough for early testing of the debugger functionality, but
should be improved in the future.

Signed-off-by: Malfurious <m@lfurio.us>

1 files changed, 100 insertions, 0 deletions

diff --git a/console.c b/console.c
new file mode 100644
index 0000000..f8949d7
--- /dev/null
+++ b/console.c
@@ -0,0 +1,100 @@
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "console.h"
+#include "curshelpers.h"
+
+int console_init(struct console *cons) {
+    int master = open("/dev/ptmx", O_RDWR | O_NOCTTY);
+    if (master < 0) {
+        return -1;
+    }
+
+    if (grantpt(master) || unlockpt(master)) {
+        close(master);
+        return -1;
+    }
+
+    int flags = fcntl(master, F_GETFL, 0);
+    if (flags < 0) {
+        close(master);
+        return -1;
+    }
+
+    flags |= O_NONBLOCK;
+    if (fcntl(master, F_SETFL, flags) < 0) {
+        close(master);
+        return -1;
+    }
+
+    cons->master = master;
+    cons->isesc = 0;
+    return 0;
+}
+
+int console_deinit(struct console *cons) {
+    close(cons->master);
+    return 0;
+}
+
+void console_enter(struct console *cons, PANEL *pan) {
+    (void)cons;
+    keypad(stdscr, FALSE);
+    curs_set(TRUE);
+    raw();
+    top_panel(pan);
+}
+
+void console_leave(struct console *cons, PANEL *pan) {
+    (void)cons;
+    (void)pan;
+    keypad(stdscr, TRUE);
+    curs_set(FALSE);
+    cbreak();
+}
+
+void console_update(struct console *cons, PANEL *pan) {
+    ssize_t nb;
+    char c;
+
+    while ((nb = read(cons->master, &c, 1)) > 0) {
+        if (!cons->isesc) {
+            if (c == 0x1b) {
+                cons->isesc = 1;
+            } else if (c != 0x0d) {
+                pprintw(pan, "%c", c);
+            }
+        } else {
+            if (c == 'm') {
+                cons->isesc = 0;
+            }
+        }
+    }
+}
+
+void console_input(struct console *cons, int ch) {
+    write(cons->master, &ch, 1);
+}
+
+int console_configslave(struct console *cons) {
+    if (setsid() < 0) {
+        return -1;
+    }
+
+    int slave = open(ptsname(cons->master), O_RDWR);
+    if (slave < 0) {
+        return -1;
+    }
+
+    if (ioctl(slave, TIOCSCTTY, 0) < 0) {
+        close(slave);
+        return -1;
+    }
+
+    dup2(slave, STDIN_FILENO);
+    dup2(slave, STDOUT_FILENO);
+    dup2(slave, STDERR_FILENO);
+    return slave;
+}