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I give up on writing (1 << 31) in any form. 

Now we just use 0x80000000UL and cast that to mksh_uari_t and,
if required, that to mksh_ari_t afterwards.
This commit is contained in:
tg 2012-03-31 17:52:33 +00:00
parent ac18ec3752
commit 9646c98356
1 changed files with 16 additions and 7 deletions
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23
expr.c
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@ -23,7 +23,7 @@
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/expr.c,v 1.55 2012/03/31 17:29:59 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/expr.c,v 1.56 2012/03/31 17:52:33 tg Exp $");
/* The order of these enums is constrained by the order of opinfo[] */
enum token {
@ -367,12 +367,19 @@ evalexpr(Expr_state *es, int prec)
case O_DIV:
case O_DIVASN:
#if !HAVE_SILENT_IDIVWRAPV
if (!es->natural && vr->val.i == -1 &&
vl->val.i == ((mksh_ari_t)-2147483648)) {
/*
* we are doing the comparisons here for the
* signed arithmetics (!es->natural) case,
* but the exact value checks and the bypass
* case assignments are done unsignedly as
* several compilers bitch around otherwise
*/
if (!es->natural &&
vl->val.u == (mksh_uari_t)0x80000000UL &&
vr->val.u == (mksh_uari_t)0xFFFFFFFFUL) {
/* -2147483648 / -1 = 2147483648 */
/* this ^ is really (1 << 31) though */
/* 80000000 / FFFFFFFF = 80000000 */
res = ((mksh_ari_t)-2147483648);
res = (mksh_ari_t)(mksh_uari_t)0x80000000UL;
} else
#endif
res = bivui(vl, /, vr);
@ -380,8 +387,10 @@ evalexpr(Expr_state *es, int prec)
case O_MOD:
case O_MODASN:
#if !HAVE_SILENT_IDIVWRAPV
if (!es->natural && vr->val.i == -1 &&
vl->val.i == ((mksh_ari_t)-2147483648)) {
/* see O_DIV / O_DIVASN for the reason behind this */
if (!es->natural &&
vl->val.u == (mksh_uari_t)0x80000000UL &&
vr->val.u == (mksh_uari_t)0xFFFFFFFFUL) {
/* -2147483648 % -1 = 0 */
res = 0;
} else