rl_helper: add ctrl-d parsing

When we press ctrl-d, the terminal send us an end-of-transmission
command. So we can exit from program.

3 files changed, 14 insertions, 6 deletions

diff --git a/btctl.c b/btctl.c
index 0262abb..e01b7bc 100644
--- a/btctl.c
+++ b/btctl.c
@@ -1200,8 +1200,8 @@ int main (int argc, char * argv[]) {
                              c == 'Y' ? true : false, 0);
             }
             change_prompt_state(NORMAL_PSTATE);
-        } else
-            rl_feed(c);
+        } else if (!rl_feed(c))
+            break; /* user pressed ctrl-d */
     }
 
     /* Disable adapter on exit */
diff --git a/rl_helper.c b/rl_helper.c
index f34639d..b066600 100644
--- a/rl_helper.c
+++ b/rl_helper.c
@@ -21,7 +21,9 @@
 
 #include <ctype.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <termios.h>
 #include "rl_helper.h"
@@ -37,6 +39,7 @@
     })
 
 typedef enum {
+    K_EOT       = 0x04, /* end-of-transmission (ctrl-d) */
     K_TAB       = 0x09,
     K_ESC       = 0x1b,
     K_BACKSPACE = 0x7f,
@@ -196,12 +199,15 @@ int rl_parse_seq(int *c) {
     }
 }
 
-void rl_feed(int c) {
+bool rl_feed(int c) {
 
     if (rl_parse_seq(&c))
-        return;
+        return true;
 
     switch (c) {
+        case K_EOT:
+            putchar('\n');
+            return false;
         case K_TAB:
             if (tab_completer_cb) {
                 const char *str = tab_completer_cb(lnbuf, pos);
@@ -272,6 +278,8 @@ void rl_feed(int c) {
                 printf(" %x ", c);
             break;
     }
+
+    return true;
 }
 
 void rl_printf(const char *fmt, ...) {
diff --git a/rl_helper.h b/rl_helper.h
index 756a79a..beeed8c 100644
--- a/rl_helper.h
+++ b/rl_helper.h
@@ -13,8 +13,8 @@ void rl_set_prompt(const char *str);
 void rl_set_tab_completer(tab_completer_callback cb);
 /* close resources */
 void rl_quit();
-/* add char to line buffer */
-void rl_feed(int c);
+/* add char to line buffer, returns false on ctrl-d */
+bool rl_feed(int c);
 /* printf version */
 void rl_printf(const char *fmt, ...);