X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdlib%2Frealloc.c;h=93a2aa418d2280d0853bf7cae2ee474abd8b0081;hb=refs%2Ftags%2FOLD;hp=ac615b8a296820c62938187618ab34cb10228f5d;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/stdlib/realloc.c b/functions/stdlib/realloc.c
index ac615b8..93a2aa4 100644
--- a/functions/stdlib/realloc.c
+++ b/functions/stdlib/realloc.c
@@ -1,8 +1,71 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* ----------------------------------------------------------------------------
+ * $Id$
+ * ----------------------------------------------------------------------------
+ * Public Domain C Library - http://pdclib.sourceforge.net
+ * This code is Public Domain. Use, modify, and redistribute at will.
+ * --------------------------------------------------------------------------*/
 
 void * realloc( void * ptr, size_t size ) { /* TODO */ };
+
+/* PDPC code - assumes size_t of memory chunk at offset -4.
+{
+    char * newptr;
+    size_t oldsize;
+
+    if ( ( newptr = malloc(size) ) != NULL )
+    {
+        if ( ptr != NULL )
+        {
+            // reading size information from hidden chunk header
+            oldsize = * (size_t *) ( (char *) ptr - 4 );
+            // correctly handle *down*sizing as well as *up*sizing
+            memcpy( newptr, ptr, ( oldsize < size ) ? oldsize : size );
+            free( ptr );
+        }
+    }
+    return ( newptr );
+}
+*/
+
+/* Thomas "Beyond Infinity" Kreitner's code - unchecked, unoptimized
+{
+    uint_t found = 0;
+    uint_t length;
+    chunk_t * new;
+    chunk_t * chunk;
+    // searching the block to-be-allocated
+    chunk = used_mem.start;
+    while ( ! found && ( chunk->next != NULL )
+    {
+        if ( chunk->address == ptr )
+        {
+            found++;
+        }
+        else
+        {
+            chunk=chunk->next;
+        }
+    }
+    if ( found )
+    {
+        length = chunk->length;
+        // allocate new memory area
+        if ( ( new = (void *) malloc( size ) ) != NULL )
+        {
+            // copy the data
+            memcpy( ptr, new, length );
+            // release the old memory
+            free( ptr );
+        }
+        else
+        {
+            new = NULL;
+        }
+    }
+    else
+    {
+        new = NULL;
+    }
+    return new;
+}
+*/