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i_system: Add an I_Realloc() function

--- a/src/i_system.c

+++ b/src/i_system.c

@@ -324,6 +324,28 @@

 }

 //

+// I_Realloc

+//

+

+void *I_Realloc(void *ptr, size_t size)

+{

+    void *new_ptr;

+

+    new_ptr = realloc(ptr, size);

+

+    if (size != 0 && new_ptr == NULL)

+    {

+        I_Error ("I_Realloc: failed on reallocation of %i bytes", size);

+    }

+    else

+    {

+        ptr = new_ptr;

+    }

+

+    return ptr;

+}

+

+//

 // Read Access Violation emulation.

 //

 // From PrBoom+, by entryway.

--- a/src/i_system.h

+++ b/src/i_system.h

@@ -56,6 +56,8 @@

 void I_Tactile (int on, int off, int total);

+void *I_Realloc(void *ptr, size_t size);

+

 boolean I_GetMemoryValue(unsigned int offset, void *value, int size);

 // Schedule a function to be called when the program exits.