-/* ----------------------------------------------------------------------------
- * $Id$
- * ----------------------------------------------------------------------------
- * Public Domain C Library - http://pdclib.sourceforge.net
- * This code is Public Domain. Use, modify, and redistribute at will.
- * --------------------------------------------------------------------------*/
+/* $Id$ */
-void * realloc( void * ptr, size_t size ) { /* TODO */ };
+/* void * realloc( void *, size_t )
-/* 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 );
-}
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
*/
-/* Thomas "Beyond Infinity" Kreitner's code - unchecked, unoptimized
+#include <stdlib.h>
+#include <string.h>
+#include <stddef.h>
+
+#ifndef REGTEST
+
+/* TODO: Primitive placeholder. Improve. */
+
+void * realloc( void * ptr, size_t size )
{
- 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 )
+ void * newptr = NULL;
+ if ( ptr == NULL )
{
- if ( chunk->address == ptr )
- {
- found++;
- }
- else
- {
- chunk=chunk->next;
- }
+ return malloc( size );
}
- if ( found )
+ if ( size > 0 )
{
- length = chunk->length;
- // allocate new memory area
- if ( ( new = (void *) malloc( size ) ) != NULL )
+ struct _PDCLIB_memnode_t * baseptr = (struct _PDCLIB_memnode_t *)( (char *)ptr - sizeof( struct _PDCLIB_memnode_t ) );
+ if ( baseptr->size >= size )
{
- // copy the data
- memcpy( ptr, new, length );
- // release the old memory
- free( ptr );
+ /* Current memnode is large enough; nothing to do. */
+ return ptr;
}
else
{
- new = NULL;
+ /* Get larger memnode and copy over contents. */
+ if ( ( newptr = malloc( size ) ) == NULL )
+ {
+ return NULL;
+ }
+ memcpy( newptr, ptr, baseptr->size );
}
}
- else
- {
- new = NULL;
- }
- return new;
+ free( ptr );
+ return newptr;
}
-*/
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+ /* tests covered in malloc test driver */
+ return TEST_RESULTS;
+}
+
+#endif
+