fix backspacing disk path in parameters interface

src/common.h

@@ -28,6 +28,9 @@
 #include <pthread.h>
 #include <ctype.h>
 
+#include <sys/time.h>
+#include <sys/types.h>
+
 #ifndef NDEBUG
 #       if defined(__GNUC__)
 #               pragma GCC diagnostic push

src/interface.c

@@ -1057,7 +1057,7 @@ void c_interface_parameters()
                 cur_y = option = 0;     /* wrap both to first */
             }
         }
-        else if (ch == kLEFT)                  /* Arrow left */
+        else if ((ch == kLEFT) && (!is_backspace()))           /* Arrow left */
         {
             switch (option)
             {

src/keys.c

@@ -14,11 +14,9 @@
  *
  */
 
-#include <stdio.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <unistd.h>
+#ifdef __linux__
 #include <linux/keyboard.h>
+#endif
 
 #include "common.h"
 #include "keys.h"
@@ -51,7 +49,10 @@ pthread_mutex_t interface_mutex = PTHREAD_MUTEX_INITIALIZER;
 int x_val, y_val;
 #endif
 
+#define SCODE_BS 14
+
 static int next_key = -1;
+static int last_scancode = -1;
 static char caps_lock = 1;              /* is enabled */
 static int in_mygetch = 0;
 
@@ -421,6 +422,8 @@ void c_periodic_update(int dummysig) {
 void c_read_raw_key(int scancode, int pressed) {
     int *keymap = NULL;
 
+    last_scancode = scancode;
+
     /* determine which key mapping to use */
     if (apple_mode == IIE_MODE || in_mygetch)
     {
@@ -508,6 +511,11 @@ void c_read_raw_key(int scancode, int pressed) {
     }
 }
 
+bool is_backspace()
+{
+    return (last_scancode == SCODE_BS);
+}
+
 int c_mygetch(int block)
 {
     int retval;

src/keys.h

@@ -14,6 +14,8 @@
  *
  */
 
+#include "common.h"
+
 #ifndef A2_KEYS_H
 #define A2_KEYS_H
 
@@ -90,5 +92,6 @@ void c_read_raw_key(int scancode, int pressed);
 void c_periodic_update(int dummysig);
 void enter_debugger(void);
 int c_mygetch(int block);
+bool is_backspace(); // is the current key actually a backspace?
 
 #endif