From 0943cd0e3f31a76a7b826c5fe2e1c510e04452f0 Mon Sep 17 00:00:00 2001
From: helixhorned <helixhorned@1a8010ca-5511-0410-912e-c29ae57300e0>
Date: Sun, 30 Aug 2015 07:24:53 +0000
Subject: [PATCH] Mapster32: in manual member editing, Shift+ENTER allows
 toggling individual bits

For values that are displayed in hex.
Patch by The Mechanic, with modifications.

git-svn-id: https://svn.eduke32.com/eduke32@5338 1a8010ca-5511-0410-912e-c29ae57300e0
---
 polymer/eduke32/source/astub.c | 53 +++++++++++++++++++++++++---------
 1 file changed, 40 insertions(+), 13 deletions(-)

diff --git a/polymer/eduke32/source/astub.c b/polymer/eduke32/source/astub.c
index 90a4fb359..2bd3d3f32 100644
--- a/polymer/eduke32/source/astub.c
+++ b/polymer/eduke32/source/astub.c
@@ -10850,6 +10850,8 @@ static void handlemed(int32_t dohex, const char *disp_membername, const char *ed
     int32_t flags = sign;
     sign &= 1;
 
+    assert(!dohex || thesizeof == sizeof(int16_t));
+
     if (thesizeof==sizeof(int8_t))
     {
         if (sign)
@@ -10858,7 +10860,12 @@ static void handlemed(int32_t dohex, const char *disp_membername, const char *ed
             val = *(uint8_t *)themember;
     }
     else if (thesizeof==sizeof(int16_t))
+    {
         val = *(int16_t *)themember;
+        // Bug fix : Do not sign extend when dealing with hex values
+        if (dohex)
+            val &= 0xFFFF;
+    }
     else //if (thesizeof==sizeof(int32_t))
         val = *(int32_t *)themember;
 
@@ -10870,23 +10877,43 @@ static void handlemed(int32_t dohex, const char *disp_membername, const char *ed
     for (; i<med_dispwidth; i++)
         med_disptext[i] = ' ';
 
-    Bsprintf(med_edittext,"%s %d %s: ", med_typename, med_thenum, edit_membername);
     if (med_editval)
     {
-        printmessage16("%s", med_edittext);
-        val = getnumber16(med_edittext, val, themax, flags);
-
-        if (thesizeof==sizeof(int8_t))
+        // If editing a hex value and either SHIFT is pressed then toggle a specific bit
+        if (SHIFTS_IS_PRESSED && dohex)
         {
-            if (sign)
-                *(int8_t *)themember = (int8_t)val;
-            else
-                *(uint8_t *)themember = (uint8_t)val;
+            // Get highest bit in maximum value
+            int32_t max_bit = 0;
+            while (max_bit < 15 && 1<<(max_bit+1) < themax)
+                max_bit++;
+
+            Bsprintf(med_edittext, "Toggle %s %d %s Bit 0..%d: ", med_typename, med_thenum, edit_membername, max_bit);
+            printmessage16("%s", med_edittext);
+
+            const int32_t bit = getnumber16(med_edittext, -1, max_bit, 1);
+            if (bit >= 0)
+                *(int16_t *)themember = (int16_t)((1<<bit) ^ (*(int16_t *)themember));
+        }
+        // Else directly edit value
+        else
+        {
+            Bsprintf(med_edittext,"%s %d %s: ", med_typename, med_thenum, edit_membername);
+
+            printmessage16("%s", med_edittext);
+            val = getnumber16(med_edittext, val, themax, flags);
+
+            if (thesizeof==sizeof(int8_t))
+            {
+                if (sign)
+                    *(int8_t *)themember = (int8_t)val;
+                else
+                    *(uint8_t *)themember = (uint8_t)val;
+            }
+            else if (thesizeof==sizeof(int16_t))
+                *(int16_t *)themember = (int16_t)val;
+            else //if (thesizeof==sizeof(int32_t))
+                *(int32_t *)themember = val;
         }
-        else if (thesizeof==sizeof(int16_t))
-            *(int16_t *)themember = (int16_t)val;
-        else //if (thesizeof==sizeof(int32_t))
-            *(int32_t *)themember = val;
     }
 }