sbrk.c

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/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# (C)2001, Gustavo Scotti (gustavo@scotti.com)
# (c) 2003 Marcus R. Brown (mrbrown@0xd6.org)
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
 
#include <kernel.h>
 
extern void * _end;
 
void *ps2_sbrk(size_t increment)
{
        static void * _heap_ptr = &_end;
        void *mp, *ret = (void *)-1;
 
        if (increment == 0)
                return _heap_ptr;
 
        /* If the area we want to allocated is past the end of our heap, we have a problem. */
        mp = _heap_ptr + increment;
        if (mp <= EndOfHeap()) {
                ret = _heap_ptr;
                _heap_ptr = mp;
        }
 
        return ret;
}