/* Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc. Contributed by Torbjorn Granlund (tege@sics.se). This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <malloc.h> int main(int argc, char **argv) { char *mem, *memp; char *rand_mem; char *lo_around, *hi_around; int size, max_size; int src_off, dst_off; int i; int space_around = 10; max_size = 256; mem = malloc (max_size + 2 * max_size + 2 * space_around); rand_mem = malloc (max_size); lo_around = malloc (space_around); hi_around = malloc (space_around); memp = mem + space_around; /* Fill RAND_MEM with random bytes, each non-zero. */ for (i = 0; i < max_size; i++) { int x; do x = rand (); while (x == 0); rand_mem[i] = x; } for (size = 0; size < max_size; size++) { printf("phase %d\n", size); for (src_off = 0; src_off <= 16; src_off++) { for (dst_off = 0; dst_off <= 16; dst_off++) { /* Put zero around the intended destination, to check that it's not clobbered. */ for (i = 1; i < space_around; i++) { memp[dst_off - i] = 0; memp[dst_off + size - 1 + i] = 0; } /* Fill the source area with known contents. */ for (i = 0; i < size; i++) memp[src_off + i] = rand_mem[i]; /* Remember the contents around the destination area. (It might not be what we wrote some lines above, since the src area and the dst area overlap.) */ for (i = 1; i < space_around; i++) { lo_around[i] = memp[dst_off - i]; hi_around[i] = memp[dst_off + size - 1 + i]; } memmove (memp + dst_off, memp + src_off, size); /* Check that the destination area has the same contents we wrote to the source area. */ for (i = 0; i < size; i++) { if (memp[dst_off + i] != rand_mem[i]) abort (); } /* Check that the area around the destination is not clobbered. */ for (i = 1; i < space_around; i++) { if (memp[dst_off - i] != lo_around[i]) abort (); if (memp[dst_off + size - 1 + i] != hi_around[i]) abort (); } } } } puts ("Test succeeded."); return 0; }