/* $Id$ */
-/* Release $Name$ */
-
/* void * realloc( void *, size_t )
This file is part of the Public Domain C Library (PDCLib).
void * realloc( void * ptr, size_t size )
{
+ void * newptr = NULL;
if ( ptr == NULL )
{
return malloc( size );
}
+ if ( size > 0 )
{
- struct _PDCLIB_memnode_t * baseptr = (struct _PDCLIB_memnode_t *)( (char *)ptr - sizeof( struct _PDCLIB_memnode_t ) );
- if ( baseptr->size >= size )
- {
- return ptr;
- }
- else
- {
- void * newptr = malloc( size );
- memcpy( newptr, ptr, baseptr->size );
- free( ptr );
- return newptr;
- }
+ struct _PDCLIB_memnode_t * baseptr = (struct _PDCLIB_memnode_t *)( (char *)ptr - sizeof( struct _PDCLIB_memnode_t ) );
+ if ( baseptr->size >= size )
+ {
+ /* Current memnode is large enough; nothing to do. */
+ return ptr;
+ }
+ else
+ {
+ /* Get larger memnode and copy over contents. */
+ if ( ( newptr = malloc( size ) ) == NULL )
+ {
+ return NULL;
+ }
+ memcpy( newptr, ptr, baseptr->size );
+ }
}
- return NULL;
+ free( ptr );
+ return newptr;
}
#endif
#ifdef TEST
#include <_PDCLIB_test.h>
-int main()
+int main( void )
{
- BEGIN_TESTS;
/* tests covered in malloc test driver */
return TEST_RESULTS;
}
#endif
+