| /* sbrk.c -- allocate memory dynamically. |
| * |
| * Copyright (c) 1995,1996,1999 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 <sys/types.h> |
| #include <sys/stat.h> |
| #include "glue.h" |
| |
| caddr_t |
| _sbrk (size_t incr) |
| { |
| static char *heap_end; |
| char *prev_heap_end; |
| char *sp = (char *)&sp; |
| |
| if (heap_end == 0) |
| { |
| heap_end = _end; |
| } |
| prev_heap_end = heap_end; |
| if (heap_end > sp) |
| { |
| _write (1, "Heap and stack collision\n", 25); |
| #if 0 /* Calling abort brings in the signal handling code. */ |
| abort (); |
| #else |
| exit (1); |
| #endif |
| } |
| heap_end += incr; |
| return (caddr_t) prev_heap_end; |
| } |
