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Diffstat (limited to 'libgloss/xstormy16/sbrk.c')
-rw-r--r-- | libgloss/xstormy16/sbrk.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/libgloss/xstormy16/sbrk.c b/libgloss/xstormy16/sbrk.c new file mode 100644 index 000000000..cb18d68bf --- /dev/null +++ b/libgloss/xstormy16/sbrk.c @@ -0,0 +1,55 @@ +/* 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 +} |