From e49504d57745c2c5b1c60369f7730252e41ce90c Mon Sep 17 00:00:00 2001
From: Adam Greenwood-Byrne <adam@isometim.es>
Date: Tue, 9 Mar 2021 22:37:23 +0000
Subject: [PATCH] Added some block functions - more work to do here

---
 part12-wgt/wgt.c      |  9 ++++++
 part12-wgt/wgt.h      |  6 ++++
 part12-wgt/wmiscb.c   | 20 ++++++++++++++
 part12-wgt/wnpblock.c | 64 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 99 insertions(+)
 create mode 100644 part12-wgt/wmiscb.c
 create mode 100644 part12-wgt/wnpblock.c

diff --git a/part12-wgt/wgt.c b/part12-wgt/wgt.c
index f22c20b..a9c13e4 100644
--- a/part12-wgt/wgt.c
+++ b/part12-wgt/wgt.c
@@ -16,6 +16,15 @@ void *memset(void *dest, int val, unsigned len)
     return dest;
 }
 
+void *memcpy(void *dest, const void *src, unsigned len)
+{
+    char *d = dest;
+    const char *s = src;
+    while (len--)
+       *d++ = *s++;
+    return dest;
+}
+
 int abs(int i)
 {
     return i < 0 ? -i : i;
diff --git a/part12-wgt/wgt.h b/part12-wgt/wgt.h
index 6217f30..1b55e4f 100644
--- a/part12-wgt/wgt.h
+++ b/part12-wgt/wgt.h
@@ -47,6 +47,7 @@ extern short bx,by,tx,ty;
 // ######## HELPER FUNCTIONS ########
 
 void *memset(void *dest, int val, unsigned len);
+void *memcpy(void *dest, const void *src, unsigned len);
 int abs(int i);
 int strlen(const char *str);
 
@@ -80,3 +81,8 @@ void wtextbackground (unsigned int col);
 void wtexttransparent (short transparent);
 void wtextgrid (short onoff);
 void wregionfill (short x, short y);
+void wfreeblock (block ptr);
+short wgetblockwidth (block ptr);
+short wgetblockheight (block ptr);
+block wnewblock (short x, short y, short x2, short y2);
+block wallocblock (short width, short height);
diff --git a/part12-wgt/wmiscb.c b/part12-wgt/wmiscb.c
new file mode 100644
index 0000000..d27ef8b
--- /dev/null
+++ b/part12-wgt/wmiscb.c
@@ -0,0 +1,20 @@
+#include "wgt.h"
+#include "include/mem.h"
+
+extern short bx,by,tx,ty;
+
+void wfreeblock (block ptr)
+{
+  free (ptr);
+}
+
+short wgetblockwidth (block ptr)
+{
+  return *(short *)ptr;                  /* Width is first 2 bytes of data */
+}
+
+short wgetblockheight (block ptr)
+{
+  ptr += 2;                              /* Skip width */
+  return *(short *)ptr;                  /* Height is second 2 bytes of data */
+}
diff --git a/part12-wgt/wnpblock.c b/part12-wgt/wnpblock.c
new file mode 100644
index 0000000..be3cfcc
--- /dev/null
+++ b/part12-wgt/wnpblock.c
@@ -0,0 +1,64 @@
+#include "wgt.h"
+#include "include/mem.h"
+
+block wnewblock (short x, short y, short x2, short y2)
+{ 
+  block ptr,orig;
+  int temp,width,height;
+  int dispofs;
+  int size;
+  int ctr;
+  
+  width = abs (x - x2) + 1;
+  height = abs (y - y2) + 1;
+  size = (int)width * (int)height + 5;
+  if  (x2 < x)
+  { 
+    temp = x; x = x2; x2 = temp;
+  }
+  if  (y2 < y)
+  { 
+    temp = y; y = y2; y2 = temp;
+  }
+  ptr = malloc (size);
+  if  (ptr == NULL)
+    return NULL;
+  orig = ptr;
+  *(short *)ptr = width;   /* store the width */
+  ptr += 2;              /* and height */
+  *(short *)ptr = height;
+  ptr += 2;
+  
+  dispofs = y * WGT_SYS.xres + x;
+  temp = width;
+  if (temp > WGT_SYS.xres)
+    temp = WGT_SYS.xres;
+  for  (ctr = y; ctr <= y2; ctr++)
+  { 
+    memcpy (ptr, &abuf[dispofs], temp);
+    /* read off the screen */
+    ptr += width;
+    dispofs += WGT_SYS.xres;
+    /* into the new ptr */
+  }
+  return orig;
+}
+
+block wallocblock (short width, short height)
+{
+  block ptr,orig;
+  int size;
+
+  size = (int)width * (int)height + 5;
+  ptr = malloc (size);
+  if  (ptr == NULL)
+    return NULL;
+  orig = ptr;
+  *(short *)ptr = width;   /* store the width */
+  ptr += 2;
+  *(short *)ptr = height;       /* and height */
+  ptr += 2;
+
+  memset (ptr, 0, size - 4);
+  return orig;
+}