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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [libgloss/] [sbrk.c] - Rev 307
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/* sbrk.c -- allocate memory dynamically. * * Copyright (c) 1995,1996 Cygnus Support * * The authors hereby grant permission to use, copy, modify, distribute, * and license this software and its documentation for any purpose, provided * that existing copyright notices are retained in all copies and that this * notice is included verbatim in any distributions. No written agreement, * license, or royalty fee is required for any of the authorized uses. * Modifications to this software may be copyrighted by their authors * and need not follow the licensing terms described here, provided that * the new terms are clearly indicated on the first page of each file where * they apply. */ #include <errno.h> #include "glue.h" /* just in case, most boards have at least some memory */ #ifndef RAMSIZE # define RAMSIZE (caddr_t)0x100000 #endif char *heap_ptr; /* * sbrk -- changes heap size size. Get nbytes more * RAM. We just increment a pointer in what's * left of memory on the board. */ char * sbrk (nbytes) int nbytes; { char *base; if (!heap_ptr) heap_ptr = (char *)&_end; base = heap_ptr; heap_ptr += nbytes; return base; /* FIXME: We really want to make sure we don't run out of RAM, but this * isn't very portable. */ #if 0 if ((RAMSIZE - heap_ptr - nbytes) >= 0) { base = heap_ptr; heap_ptr += nbytes; return (base); } else { errno = ENOMEM; return ((char *)-1); } #endif }
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