fix backspacing of unicode chars in OSK

input/input_keyboard.c

@@ -21,6 +21,8 @@
 
 #include "input_keyboard.h"
 
+#include <encodings/utf.h>
+
 #include "../configuration.h"
 #include "../runloop.h"
 
@@ -48,6 +50,46 @@ static void *g_keyboard_press_data;
 
 static bool return_pressed;
 
+static unsigned osk_last_codepoint = 0;
+static unsigned osk_last_codepoint_len = 0;
+
+static void osk_update_last_codepoint(const char *word)
+{
+   const char *letter = word;
+   const char *pos = letter;
+
+   if (letter[0] == 0)
+   {
+      osk_last_codepoint = 0;
+      osk_last_codepoint_len = 0;
+      return;
+   }
+
+   for (;;)
+   {
+      unsigned codepoint = utf8_walk(&letter);
+      unsigned len = letter - pos;
+
+      if (letter[0] == 0)
+      {
+         osk_last_codepoint = codepoint;
+         osk_last_codepoint_len = len;
+         break;
+      }
+
+      pos = letter;
+   }
+}
+
+static void osk_update_last_char(const char c)
+{
+   char array[2] = {0};
+
+   array[0] = c;
+
+   osk_update_last_codepoint(array);
+}
+
 bool input_keyboard_return_pressed()
 {
    return return_pressed;
@@ -123,12 +165,14 @@ static bool input_keyboard_line_event(
       input_keyboard_line_t *state, uint32_t character)
 {
    char c = character >= 128 ? '?' : character;
+
    /* Treat extended chars as ? as we cannot support 
     * printable characters for unicode stuff. */
 
    if (c == '\r' || c == '\n')
    {
       state->cb(state->userdata, state->buffer);
+      osk_update_last_char(c);
       return true;
    }
 
@@ -136,12 +180,20 @@ static bool input_keyboard_line_event(
    {
       if (state->ptr)
       {
-         memmove(state->buffer + state->ptr - 1,
-               state->buffer + state->ptr,
-               state->size - state->ptr + 1);
-         state->ptr--;
-         state->size--;
+         unsigned i;
+
+         for (i = 0; i < osk_last_codepoint_len; i++)
+         {
+            memmove(state->buffer + state->ptr - 1,
+                  state->buffer + state->ptr,
+                  state->size - state->ptr + 1);
+            state->ptr--;
+            state->size--;
+         }
+
+         osk_update_last_codepoint(state->buffer);
       }
+
    }
    else if (isprint((int)c))
    {
@@ -161,6 +213,8 @@ static bool input_keyboard_line_event(
       newbuf[state->size] = '\0';
 
       state->buffer = newbuf;
+
+      osk_update_last_char(c);
    }
 
    return false;
@@ -191,6 +245,8 @@ bool input_keyboard_line_append(const char *word)
 
    g_keyboard_line->buffer = newbuf;
 
+   osk_update_last_codepoint(word);
+
    return false;
 }
 

menu/menu_event.c

@@ -25,6 +25,7 @@
 #endif
 
 #include <encodings/utf.h>
+#include <string/stdstring.h>
 
 #include "widgets/menu_entry.h"
 #include "widgets/menu_input_dialog.h"
@@ -114,33 +115,21 @@ void menu_event_osk_append(int ptr)
 {
    if (ptr >= 0)
    {
-      if (!strcmp(osk_grid[ptr],"⇦"))
-      {
+      if (string_is_equal(osk_grid[ptr],"⇦"))
          input_keyboard_event(true, '\x7f', '\x7f', 0, RETRO_DEVICE_KEYBOARD);
-      }
-      else if (!strcmp(osk_grid[ptr],"⏎"))
-      {
+      else if (string_is_equal(osk_grid[ptr],"⏎"))
          input_keyboard_event(true, '\n', '\n', 0, RETRO_DEVICE_KEYBOARD);
-      }
-      else if (!strcmp(osk_grid[ptr],"⇧"))
-      {
+      else if (string_is_equal(osk_grid[ptr],"⇧"))
          osk_idx = OSK_UPPERCASE_LATIN;
-      }
-      else if (!strcmp(osk_grid[ptr],"⇩"))
-      {
+      else if (string_is_equal(osk_grid[ptr],"⇩"))
          osk_idx = OSK_LOWERCASE_LATIN;
-      }
-      else if (!strcmp(osk_grid[ptr],"⊕"))
-      {
+      else if (string_is_equal(osk_grid[ptr],"⊕"))
          if (osk_idx < OSK_TYPE_LAST - 1)
             osk_idx = (enum osk_type)(osk_idx + 1);
          else
             osk_idx = (enum osk_type)(OSK_TYPE_UNKNOWN + 1);
-      }
       else
-      {
          input_keyboard_line_append(osk_grid[ptr]);
-      }
    }
 }
 
@@ -288,17 +277,17 @@ unsigned menu_event(uint64_t input, uint64_t trigger_input)
             memcpy(osk_grid, katakana_page2_grid, sizeof(katakana_page2_grid));
             break;
          }
-         case OSK_LOWERCASE_LATIN:
-         {
-            memcpy(osk_grid, lowercase_grid, sizeof(lowercase_grid));
-            break;
-         }
          case OSK_UPPERCASE_LATIN:
-         default:
          {
             memcpy(osk_grid, uppercase_grid, sizeof(uppercase_grid));
             break;
          }
+         case OSK_LOWERCASE_LATIN:
+         default:
+         {
+            memcpy(osk_grid, lowercase_grid, sizeof(lowercase_grid));
+            break;
+         }
       }
 
       if (trigger_input & (UINT64_C(1) << RETRO_DEVICE_ID_JOYPAD_DOWN))