From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- string/testcopy.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 string/testcopy.c (limited to 'string/testcopy.c') diff --git a/string/testcopy.c b/string/testcopy.c new file mode 100644 index 0000000000..9ec5c7761c --- /dev/null +++ b/string/testcopy.c @@ -0,0 +1,111 @@ +/* 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 +#include +#include +#include +#include + +int +DEFUN(main, (argc, argv), + int argc AND 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 = random (); + 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; +} -- cgit v1.2.3