62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/*
|
|
Copyright (c) 2015, Synopsys, Inc. All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
1) Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
2) Redistributions in binary form must reproduce the above copyright notice,
|
|
this list of conditions and the following disclaimer in the documentation
|
|
and/or other materials provided with the distribution.
|
|
|
|
3) Neither the name of the Synopsys, Inc., nor the names of its contributors
|
|
may be used to endorse or promote products derived from this software
|
|
without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/errno.h>
|
|
|
|
extern char __start_heap;
|
|
extern char __end_heap;
|
|
|
|
caddr_t
|
|
_sbrk (size_t nbytes)
|
|
{
|
|
static char* heap_ptr = NULL;
|
|
char* prev_heap_ptr;
|
|
|
|
if (heap_ptr == NULL)
|
|
{
|
|
heap_ptr = &__start_heap;
|
|
}
|
|
|
|
/* Align the 'heap_ptr' so that memory will always be allocated at word
|
|
boundaries. */
|
|
heap_ptr = (char *) ((((unsigned long) heap_ptr) + 7) & ~7);
|
|
prev_heap_ptr = heap_ptr;
|
|
|
|
if ((heap_ptr + nbytes) < &__end_heap)
|
|
{
|
|
heap_ptr += nbytes;
|
|
return (caddr_t) prev_heap_ptr;
|
|
}
|
|
|
|
errno = ENOMEM;
|
|
return (caddr_t) -1;
|
|
}
|