mes/scaffold/tests/76-pointer-arithmetic.c

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/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2017 Jan Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of Mes.
*
* Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* Mes 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include "30-test.i"
#include <stdio.h>
char *list[2] = {"foo\n", "bar\n"};
struct foo {
int a;
int b;
int c;
unsigned char *d;
};
int
test ()
{
char *pc = 0;
void *pv = 0;
int *pi = 0;
char **ppc = 0;
void **ppv = 0;
int **ppi = 0;
if (++pc != 1) return 1;
if (++pv != 1) return 2;
if (++pi != 4) return 3;
if (++ppc != 4) return 4;
if (++ppv != 4) return 5;
if (++ppi != 4) return 6;
if (pc + 1 != 2) return 7;
if (pv + 1 != 2) return 8;
if (pi + 1 != 8) return 9;
if (ppc + 1 != 8) return 10;
if (ppv + 1 != 8) return 11;
if (ppi + 1 != 8) return 12;
char **p = list;
++*p;
eputs (*p);
if (strcmp (*p, "oo\n")) return 13;
--*p;
eputs (*p);
if (strcmp (*p, "foo\n")) return 14;
struct foo* pfoo = 0;
eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
pfoo++;
eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
if (pfoo != 16) return 15;
pfoo--;
eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
if (pfoo) return 16;
pfoo++;
eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
if (pfoo != 16) return 17;
int one = 1;
int two = 2;
pfoo = pfoo - one;
eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
if (pfoo) return 18;
pfoo = pfoo + one;
eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
if (pfoo != 16) return 19;
pfoo -= one;
eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
if (pfoo) return 20;
pfoo += one;
eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
if (pfoo != 16) return 21;
if (&one - 1 != &two) return 22;
struct foo* sym = 32;
int d = 16;
int i = sym + 16;
eputs ("i="); eputs (itoa (i)); eputs ("\n");
if (i != 288) return 23;
i = sym + d;
eputs ("i="); eputs (itoa (i)); eputs ("\n");
if (i != 288) return 24;
i = sym - 16;
eputs ("i="); eputs (itoa (i)); eputs ("\n");
if (i != -224) return 25;
i = sym - d;
eputs ("i="); eputs (itoa (i)); eputs ("\n");
if (i != -224) return 26;
i = sym - (struct foo*)d;
eputs ("i="); eputs (itoa (i)); eputs ("\n");
if (i != 1) return 27;
pfoo = sym + 1;
pfoo -= sym;
eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
if (pfoo != 1) return 28;
return 0;
}