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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [mep/] [sbrk.c] - Rev 184
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/* * Copyright (c) 2003 Red Hat, Inc. All rights reserved. * * This copyrighted material is made available to anyone wishing to use, modify, * copy, or redistribute it subject to the terms and conditions of the BSD * License. This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY expressed or implied, including the implied * warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. A copy * of this license is available at http://www.opensource.org/licenses. Any * Red Hat trademarks that are incorporated in the source code or documentation * are not subject to the BSD License and may only be used or replicated with * the express permission of Red Hat, Inc. */ #include <errno.h> extern int __heap __far; /* beginning of heap */ extern int __heap_end __far; /* if at address 0, use stack pointer as limit */ static char *the_break = (char *)(& __heap); int is_addr_0 (int address) { return address ? 0 : 1; } void * sbrk(int inc) { char *current_heap_limit = (char *) (& __heap_end); /* is_addr_0 avoids optimizing out this block. */ if (is_addr_0 ((int) current_heap_limit)) { int something; int margin = 4096; current_heap_limit = (char *) (& something) - margin; } if ((the_break + inc) < current_heap_limit) { void *rv = (void *) the_break; the_break += inc; return rv; } else { errno = ENOMEM; return (void *) -1; } } int brk (void *ptr) { the_break = ptr; return 0; }
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