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21
22#
23# Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
24#
25
26#
27# This test checks whether the arithmetric function "iszero" is available.
28#
29# This was reported as CR #6777491 ("*ksh93* lacks arithmetric function
30# iszero()"):
31# ------------ snip ------------
32# ksh93 lacks arithmetric function "iszero()" which limits the ability
33# to classify floating-point values or even correctly match against
34# zero (since IEEE754-1985/2008 floating-point math differs between
35# positive and negaive zero values).
36# Frequency
37#    Always
38# Regression
39#    No
40# Steps to Reproduce
41#    $ ksh93 -c '(( iszero(0) )) && print "0 is a zero"'
42# Expected Result
43#    Output to stdout:
44# -- snip --
45# 0 is a zero
46# -- snip --
47# Actual Result
48#    ksh93 exists with:
49# -- snip --
50# ksh93: iszero(0) : unknown function
51# -- snip --
52# Error Message(s)
53#    ksh93: iszero(0) : unknown function
54# Test Case
55#    ksh93 -c '(( iszero(0) )) && print "0 is a zero"'
56# ------------ snip ------------
57#
58
59# test setup
60function err_exit
61{
62	print -u2 -n "\t"
63	print -u2 -r ${Command}[$1]: "${@:2}"
64	(( Errors < 127 && Errors++ ))
65}
66alias err_exit='err_exit $LINENO'
67
68set -o nounset
69Command=${0##*/}
70integer Errors=0
71
72typeset str
73integer i
74
75typeset -a tests=(
76	'(( iszero(0)   )) && print "OK"'
77	'(( iszero(0.)  )) && print "OK"'
78	'(( iszero(-0)  )) && print "OK"'
79	'(( iszero(-0.) )) && print "OK"'
80	'float n=0.  ; (( iszero(n) )) && print "OK"'
81	'float n=+0. ; (( iszero(n) )) && print "OK"'
82	'float n=-0. ; (( iszero(n) )) && print "OK"'
83	'float n=1.  ; (( iszero(n) )) || print "OK"'
84	'float n=1.  ; (( iszero(n-1.) )) && print "OK"'
85	'float n=-1. ; (( iszero(n+1.) )) && print "OK"'
86)
87
88for (( i=0 ; i < ${#tests[@]} ; i++ )) ; do
89	str="$( $SHELL -o errexit -c "${tests[i]}" 2>&1 )" || err_exit "test $i: returned non-zero exit code $?"
90	[[ "${str}" == "OK" ]] || err_exit "test $i: expected 'OK', got '${str}'"
91done
92
93# tests done
94exit $((Errors))
95