From 1113961dde21ce73c1543ca466913d9e17d06c1b Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Thu, 16 May 2019 09:40:36 +0200 Subject: dc: make 4 % 0 emit error messgaes and set result to 0 function old new delta mod 105 136 +31 Signed-off-by: Denys Vlasenko --- miscutils/dc.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/miscutils/dc.c b/miscutils/dc.c index 5119c13..5aef64b 100644 --- a/miscutils/dc.c +++ b/miscutils/dc.c @@ -94,13 +94,18 @@ static void mod(void) { data_t d = pop(); - //if (d == 0) { - // bb_error_msg("remainder by zero"); - // pop(); - // push(0); - // return; - //} - //^^^^ without this, we simply get SIGFPE and die + /* compat with dc (GNU bc 1.07.1) 1.4.1: + * $ dc -e '4 0 % p' + * dc: remainder by zero + * 0 + */ + if (d == 0) { + bb_error_msg("remainder by zero"); + pop(); + push(0); + return; + } + /* ^^^^ without this, we simply get SIGFPE and die */ push((data_t) pop() % d); } -- cgit v1.1