xref: /openbsd/gnu/usr.bin/perl/t/op/infnan.t (revision 771fbea0) 
1#!./perl -w
2
3BEGIN {
4    chdir 't' if -d 't';
5    require './test.pl';
6    set_up_inc('../lib');
7}
8
9use strict;
10
11use Config;
12
13BEGIN {
14    if ($^O eq 'aix' && $Config{uselongdouble}) {
15        # FWIW: NaN actually seems to be working decently,
16        # but Inf is completely broken (e.g. Inf + 0 -> NaN).
17        skip_all "$^O with long doubles does not have sane inf/nan";
18    }
19    unless ($Config{d_double_has_inf} && $Config{d_double_has_nan}) {
20        skip_all "the doublekind $Config{doublekind} does not have inf/nan";
21    }
22}
23
24my $PInf = "Inf"  + 0;
25my $NInf = "-Inf" + 0;
26my $NaN;
27{
28    local $^W = 0; # warning-ness tested later.
29    $NaN  = "NaN" + 0;
30}
31
32my @PInf = ("Inf", "inf", "INF", "+Inf",
33            "Infinity",
34            "1.#INF", "1#INF", "1.#INF00");
35my @NInf = map { "-$_" } grep { ! /^\+/ } @PInf;
36
37my @NaN = ("NAN", "nan", "qnan", "SNAN", "NanQ", "NANS",
38           "1.#QNAN", "+1#SNAN", "-1.#NAN", "1#IND", "1.#IND00",
39           "NAN(123)");
40
41my @printf_fmt = qw(e f g a d u o i b x);
42my @packi_fmt = qw(c C s S l L i I n N v V j J w W U);
43my @packf_fmt = qw(f d F);
44my @packs_fmt = qw(a4 A4 Z5 b20 B20 h10 H10 u);
45
46if ($Config{ivsize} == 8) {
47    push @packi_fmt, qw(q Q);
48}
49
50if ($Config{uselongdouble} && $Config{nvsize} > $Config{doublesize}) {
51    push @packf_fmt, 'D';
52}
53
54# === Inf tests ===
55
56cmp_ok($PInf, '>', 0, "positive infinity");
57cmp_ok($NInf, '<', 0, "negative infinity");
58
59cmp_ok($PInf, '>', $NInf, "positive > negative");
60cmp_ok($NInf, '==', -$PInf, "negative == -positive");
61cmp_ok(-$NInf, '==', $PInf, "--negative == positive");
62
63is($PInf,  "Inf", "$PInf value stringifies as Inf");
64is($NInf, "-Inf", "$NInf value stringifies as -Inf");
65
66cmp_ok($PInf + 0, '==', $PInf, "+Inf + zero is +Inf");
67cmp_ok($NInf + 0, '==', $NInf, "-Inf + zero is -Inf");
68
69cmp_ok($PInf + 1, '==', $PInf, "+Inf + one is +Inf");
70cmp_ok($NInf + 1, '==', $NInf, "-Inf + one is -Inf");
71
72cmp_ok($PInf + $PInf, '==', $PInf, "+Inf + Inf is +Inf");
73cmp_ok($NInf + $NInf, '==', $NInf, "-Inf - Inf is -Inf");
74
75cmp_ok($PInf * 2, '==', $PInf, "twice Inf is Inf");
76cmp_ok($PInf / 2, '==', $PInf, "half of Inf is Inf");
77
78cmp_ok($PInf * $PInf, '==', $PInf, "+Inf * +Inf is +Inf");
79cmp_ok($PInf * $NInf, '==', $NInf, "+Inf * -Inf is -Inf");
80cmp_ok($NInf * $PInf, '==', $NInf, "-Inf * +Inf is -Inf");
81cmp_ok($NInf * $NInf, '==', $PInf, "-Inf * -Inf is +Inf");
82
83is(sprintf("%g", $PInf), "Inf", "$PInf sprintf %g is Inf");
84is(sprintf("%a", $PInf), "Inf", "$PInf sprintf %a is Inf");
85
86for my $f (@printf_fmt) {
87    is(sprintf("%$f", $PInf), "Inf", "$PInf sprintf %$f is Inf");
88}
89
90is(sprintf("%+g", $PInf), "+Inf", "$PInf sprintf %+g");
91is(sprintf("%+g", $NInf), "-Inf", "$PInf sprintf %+g");
92
93is(sprintf("%4g",  $PInf), " Inf", "$PInf sprintf %4g");
94is(sprintf("%-4g", $PInf), "Inf ", "$PInf sprintf %-4g");
95
96is(sprintf("%+-5g", $PInf), "+Inf ", "$PInf sprintf %+-5g");
97is(sprintf("%-+5g", $PInf), "+Inf ", "$PInf sprintf %-+5g");
98
99is(sprintf("%-+5g", $NInf), "-Inf ", "$NInf sprintf %-+5g");
100is(sprintf("%+-5g", $NInf), "-Inf ", "$NInf sprintf %+-5g");
101
102ok(!defined eval { $a = sprintf("%c", $PInf)}, "sprintf %c +Inf undef");
103like($@, qr/Cannot printf/, "$PInf sprintf fails");
104ok(!defined eval { $a = sprintf("%c", "Inf")},
105  "stringy sprintf %c +Inf undef");
106like($@, qr/Cannot printf/, "stringy $PInf sprintf %c fails");
107
108ok(!defined eval { $a = chr($PInf) }, "chr(+Inf) undef");
109like($@, qr/Cannot chr/, "+Inf chr() fails");
110ok(!defined eval { $a = chr("Inf") }, "chr(stringy +Inf) undef");
111like($@, qr/Cannot chr/, "stringy +Inf chr() fails");
112
113ok(!defined eval { $a = sprintf("%c", $NInf)}, "sprintf %c -Inf undef");
114like($@, qr/Cannot printf/, "$NInf sprintf fails");
115ok(!defined eval { $a = sprintf("%c", "-Inf")},
116  "sprintf %c stringy -Inf undef");
117like($@, qr/Cannot printf/, "stringy $NInf sprintf %c fails");
118
119ok(!defined eval { $a = chr($NInf) }, "chr(-Inf) undef");
120like($@, qr/Cannot chr/, "-Inf chr() fails");
121ok(!defined eval { $a = chr("-Inf") }, "chr(stringy -Inf) undef");
122like($@, qr/Cannot chr/, "stringy -Inf chr() fails");
123
124for my $f (@packi_fmt) {
125    undef $a;
126    ok(!defined eval { $a = pack($f, $PInf) }, "pack $f +Inf undef");
127    like($@, $f eq 'w' ? qr/Cannot compress Inf/: qr/Cannot pack Inf/,
128         "+Inf pack $f fails");
129    undef $a;
130    ok(!defined eval { $a = pack($f, "Inf") },
131      "pack $f stringy +Inf undef");
132    like($@, $f eq 'w' ? qr/Cannot compress Inf/: qr/Cannot pack Inf/,
133         "stringy +Inf pack $f fails");
134    undef $a;
135    ok(!defined eval { $a = pack($f, $NInf) }, "pack $f -Inf undef");
136    like($@, $f eq 'w' ? qr/Cannot compress -Inf/: qr/Cannot pack -Inf/,
137         "-Inf pack $f fails");
138    undef $a;
139    ok(!defined eval { $a = pack($f, "-Inf") },
140      "pack $f stringy -Inf undef");
141    like($@, $f eq 'w' ? qr/Cannot compress -Inf/: qr/Cannot pack -Inf/,
142         "stringy -Inf pack $f fails");
143}
144
145for my $f (@packf_fmt) {
146    undef $a;
147    undef $b;
148    ok(defined eval { $a = pack($f, $PInf) }, "pack $f +Inf defined");
149    eval { $b = unpack($f, $a) };
150    cmp_ok($b, '==', $PInf, "pack $f +Inf equals $PInf");
151
152    undef $a;
153    undef $b;
154    ok(defined eval { $a = pack($f, $NInf) }, "pack $f -Inf defined");
155    eval { $b = unpack($f, $a) };
156    cmp_ok($b, '==', $NInf, "pack $f -Inf equals $NInf");
157}
158
159for my $f (@packs_fmt) {
160    undef $a;
161    ok(defined eval { $a = pack($f, $PInf) }, "pack $f +Inf defined");
162    is($a, pack($f, "Inf"), "pack $f +Inf same as 'Inf'");
163
164    undef $a;
165    ok(defined eval { $a = pack($f, $NInf) }, "pack $f -Inf defined");
166    is($a, pack($f, "-Inf"), "pack $f -Inf same as 'Inf'");
167}
168
169is eval { unpack "p", pack 'p', $PInf }, "Inf", "pack p +Inf";
170is eval { unpack "P3", pack 'P', $PInf }, "Inf", "pack P +Inf";
171is eval { unpack "p", pack 'p', $NInf }, "-Inf", "pack p -Inf";
172is eval { unpack "P4", pack 'P', $NInf }, "-Inf", "pack P -Inf";
173
174for my $i (@PInf) {
175    cmp_ok($i + 0 , '==', $PInf, "$i is +Inf");
176    cmp_ok($i, '>', 0, "$i is positive");
177    is("@{[$i+0]}", "Inf", "$i value stringifies as Inf");
178}
179
180for my $i (@NInf) {
181    cmp_ok($i + 0, '==', $NInf, "$i is -Inf");
182    cmp_ok($i, '<', 0, "$i is negative");
183    is("@{[$i+0]}", "-Inf", "$i value stringifies as -Inf");
184}
185
186is($PInf + $PInf, $PInf, "+Inf plus +Inf is +Inf");
187is($NInf + $NInf, $NInf, "-Inf plus -Inf is -Inf");
188
189is(1/$PInf, 0, "one per +Inf is zero");
190is(1/$NInf, 0, "one per -Inf is zero");
191
192my ($PInfPP, $PInfMM) = ($PInf, $PInf);
193my ($NInfPP, $NInfMM) = ($NInf, $NInf);;
194$PInfPP++;
195$PInfMM--;
196$NInfPP++;
197$NInfMM--;
198is($PInfPP, $PInf, "+Inf++ is +Inf");
199is($PInfMM, $PInf, "+Inf-- is +Inf");
200is($NInfPP, $NInf, "-Inf++ is -Inf");
201is($NInfMM, $NInf, "-Inf-- is -Inf");
202
203ok($PInf, "+Inf is true");
204ok($NInf, "-Inf is true");
205
206is(abs($PInf), $PInf, "abs(+Inf) is +Inf");
207is(abs($NInf), $PInf, "abs(-Inf) is +Inf");
208
209# One could argue of NaN as the result.
210is(int($PInf), $PInf, "int(+Inf) is +Inf");
211is(int($NInf), $NInf, "int(-Inf) is -Inf");
212
213is(sqrt($PInf), $PInf, "sqrt(+Inf) is +Inf");
214# sqrt $NInf doesn't work because negative is caught
215
216is(exp($PInf), $PInf, "exp(+Inf) is +Inf");
217is(exp($NInf), 0, "exp(-Inf) is zero");
218
219SKIP: {
220    if ($PInf == 0) {
221        skip "if +Inf == 0 cannot log(+Inf)", 1;
222    }
223    is(log($PInf), $PInf, "log(+Inf) is +Inf");
224}
225# log $NInf doesn't work because negative is caught
226
227is(rand($PInf), $PInf, "rand(+Inf) is +Inf");
228is(rand($NInf), $NInf, "rand(-Inf) is -Inf");
229
230# XXX Bit operations?
231# +Inf & 1 == +Inf?
232# +Inf | 1 == +Inf?
233# +Inf ^ 1 == +Inf?
234# ~+Inf    == 0? or NaN?
235# -Inf ... ???
236# NaN & 1 == NaN?
237# NaN | 1 == NaN?
238# NaN ^ 1 == NaN?
239# ~NaN    == NaN???
240# Or just declare insanity and die?
241
242TODO: {
243    local $::TODO;
244    my $here = "$^O $Config{osvers}";
245    $::TODO = "$here: pow (9**9**9) doesn't give Inf"
246        if $here =~ /^(?:hpux 10|os390)/;
247    is(9**9**9, $PInf, "9**9**9 is Inf");
248}
249
250SKIP: {
251    my @FInf = qw(Infinite Info Inf123 Infiniti Infinityz);
252    if ($Config{usequadmath}) {
253        skip "quadmath strtoflt128() accepts false infinities", scalar @FInf;
254    }
255    for my $i (@FInf) {
256        # Silence "isn't numeric in addition", that's kind of the point.
257        local $^W = 0;
258        cmp_ok("$i" + 0, '==', $PInf, "false infinity $i");
259    }
260}
261
262{
263    # Silence "Non-finite repeat count", that is tested elsewhere.
264    local $^W = 0;
265    is("a" x $PInf, "", "x +Inf");
266    is("a" x $NInf, "", "x -Inf");
267}
268
269{
270    eval 'for my $x (0..$PInf) { last }';
271    like($@, qr/Range iterator outside integer range/, "0..+Inf fails");
272
273    eval 'for my $x ($NInf..0) { last }';
274    like($@, qr/Range iterator outside integer range/, "-Inf..0 fails");
275}
276
277# === NaN ===
278
279cmp_ok($NaN, '!=', $NaN, "NaN is NaN numerically (by not being NaN)");
280ok($NaN eq $NaN, "NaN is NaN stringifically");
281
282is("$NaN", "NaN", "$NaN value stringifies as NaN");
283
284{
285    local $^W = 0; # warning-ness tested later.
286    is("+NaN" + 0, "NaN", "+NaN is NaN");
287    is("-NaN" + 0, "NaN", "-NaN is NaN");
288}
289
290is($NaN + 0, $NaN, "NaN + zero is NaN");
291
292is($NaN + 1, $NaN, "NaN + one is NaN");
293
294is($NaN * 2, $NaN, "twice NaN is NaN");
295is($NaN / 2, $NaN, "half of NaN is NaN");
296
297is($NaN * $NaN, $NaN, "NaN * NaN is NaN");
298SKIP: {
299    if ($NaN == 0) {
300        skip "NaN looks like zero, avoiding dividing by it", 1;
301    }
302    is($NaN / $NaN, $NaN, "NaN / NaN is NaN");
303}
304
305for my $f (@printf_fmt) {
306    is(sprintf("%$f", $NaN), "NaN", "$NaN sprintf %$f is NaN");
307}
308
309is(sprintf("%+g", $NaN), "NaN", "$NaN sprintf %+g");
310
311is(sprintf("%4g",  $NaN), " NaN", "$NaN sprintf %4g");
312is(sprintf("%-4g", $NaN), "NaN ", "$NaN sprintf %-4g");
313
314is(sprintf("%+-5g", $NaN), "NaN  ", "$NaN sprintf %+-5g");
315is(sprintf("%-+5g", $NaN), "NaN  ", "$NaN sprintf %-+5g");
316
317ok(!defined eval { $a = sprintf("%c", $NaN)}, "sprintf %c NaN undef");
318like($@, qr/Cannot printf/, "$NaN sprintf fails");
319ok(!defined eval { $a = sprintf("%c", "NaN")},
320  "sprintf %c stringy NaN undef");
321like($@, qr/Cannot printf/, "stringy $NaN sprintf %c fails");
322
323ok(!defined eval { $a = chr($NaN) }, "chr NaN undef");
324like($@, qr/Cannot chr/, "NaN chr() fails");
325ok(!defined eval { $a = chr("NaN") }, "chr stringy NaN undef");
326like($@, qr/Cannot chr/, "stringy NaN chr() fails");
327
328for my $f (@packi_fmt) {
329    ok(!defined eval { $a = pack($f, $NaN) }, "pack $f NaN undef");
330    like($@, $f eq 'w' ? qr/Cannot compress NaN/: qr/Cannot pack NaN/,
331         "NaN pack $f fails");
332    ok(!defined eval { $a = pack($f, "NaN") },
333       "pack $f stringy NaN undef");
334    like($@, $f eq 'w' ? qr/Cannot compress NaN/: qr/Cannot pack NaN/,
335         "stringy NaN pack $f fails");
336}
337
338for my $f (@packf_fmt) {
339    ok(defined eval { $a = pack($f, $NaN) }, "pack $f NaN defined");
340    eval { $b = unpack($f, $a) };
341    cmp_ok($b, '!=', $b, "pack $f NaN not-equals $NaN");
342}
343
344for my $f (@packs_fmt) {
345    ok(defined eval { $a = pack($f, $NaN) }, "pack $f NaN defined");
346    is($a, pack($f, "NaN"), "pack $f NaN same as 'NaN'");
347}
348
349is eval { unpack "p", pack 'p', $NaN }, "NaN", "pack p +NaN";
350is eval { unpack "P3", pack 'P', $NaN }, "NaN", "pack P +NaN";
351
352for my $i (@NaN) {
353    cmp_ok($i + 0, '!=', $i + 0, "$i is NaN numerically (by not being NaN)");
354    is("@{[$i+0]}", "NaN", "$i value stringifies as NaN");
355}
356
357ok(!($NaN <  0), "NaN is not lt zero");
358ok(!($NaN == 0), "NaN is not == zero");
359ok(!($NaN >  0), "NaN is not gt zero");
360
361ok(!($NaN < $NaN), "NaN is not lt NaN");
362ok(!($NaN > $NaN), "NaN is not gt NaN");
363
364# is() okay with $NaN because it uses eq.
365is($NaN * 0, $NaN, "NaN times zero is NaN");
366is($NaN * 2, $NaN, "NaN times two is NaN");
367
368my ($NaNPP, $NaNMM) = ($NaN, $NaN);
369$NaNPP++;
370$NaNMM--;
371is($NaNPP, $NaN, "+NaN++ is NaN");
372is($NaNMM, $NaN, "+NaN-- is NaN");
373
374# You might find this surprising (isn't NaN kind of like of undef?)
375# but this is how it is.
376ok($NaN, "NaN is true");
377
378is(abs($NaN), $NaN, "abs(NaN) is NaN");
379is(int($NaN), $NaN, "int(NaN) is NaN");
380is(sqrt($NaN), $NaN, "sqrt(NaN) is NaN");
381is(exp($NaN), $NaN, "exp(NaN) is NaN");
382
383SKIP: {
384    if ($NaN == 0) {
385        skip "if +NaN == 0 cannot log(+NaN)", 1;
386    }
387    is(log($NaN), $NaN, "log(NaN) is NaN");
388}
389
390is(sin($NaN), $NaN, "sin(NaN) is NaN");
391is(rand($NaN), $NaN, "rand(NaN) is NaN");
392
393TODO: {
394    local $::TODO;
395    my $here = "$^O $Config{osvers}";
396    $::TODO = "$here: pow (9**9**9) doesn't give Inf"
397        if $here =~ /^(?:hpux 10|os390)/;
398    is(sin(9**9**9), $NaN, "sin(9**9**9) is NaN");
399}
400
401SKIP: {
402    my @FNaN = qw(NaX XNAN Ind Inx);
403    # Silence "isn't numeric in addition", that's kind of the point.
404    local $^W = 0;
405    for my $i (@FNaN) {
406        cmp_ok("$i" + 0, '==', 0, "false nan $i");
407    }
408}
409
410{
411    # Silence "Non-finite repeat count", that is tested elsewhere.
412    local $^W = 0;
413    is("a" x $NaN, "", "x NaN");
414}
415
416# === Tests combining Inf and NaN ===
417
418# is() okay with $NaN because it uses eq.
419is($PInf * 0,     $NaN, "Inf times zero is NaN");
420is($PInf * $NaN,  $NaN, "Inf times NaN is NaN");
421is($PInf + $NaN,  $NaN, "Inf plus NaN is NaN");
422is($PInf - $PInf, $NaN, "Inf minus inf is NaN");
423is($PInf / $PInf, $NaN, "Inf div inf is NaN");
424is($PInf % $PInf, $NaN, "Inf mod inf is NaN");
425
426ok(!($NaN <  $PInf), "NaN is not lt +Inf");
427ok(!($NaN == $PInf), "NaN is not eq +Inf");
428ok(!($NaN >  $PInf), "NaN is not gt +Inf");
429
430ok(!($NaN <  $NInf), "NaN is not lt -Inf");
431ok(!($NaN == $NInf), "NaN is not eq -Inf");
432ok(!($NaN >  $NInf), "NaN is not gt -Inf");
433
434is(sin($PInf), $NaN, "sin(+Inf) is NaN");
435
436{
437    eval 'for my $x (0..$NaN) { last }';
438    like($@, qr/Range iterator outside integer range/, "0..NaN fails");
439
440    eval 'for my $x ($NaN..0) { last }';
441    like($@, qr/Range iterator outside integer range/, "NaN..0 fails");
442}
443
444# === Overflows and Underflows ===
445
446# 1e9999 (and 1e-9999) are large (and small) enough for even
447# IEEE quadruple precision (magnitude 10**4932, and 10**-4932).
448
449cmp_ok(1e9999,     '==', $PInf, "overflow to +Inf (compile time)");
450cmp_ok('1e9999',   '==', $PInf, "overflow to +Inf (runtime)");
451cmp_ok(-1e9999,    '==', $NInf, "overflow to -Inf (compile time)");
452cmp_ok('-1e9999',  '==', $NInf, "overflow to -Inf (runtime)");
453cmp_ok(1e-9999,    '==', 0,     "underflow to 0 (compile time) from pos");
454cmp_ok('1e-9999',  '==', 0,     "underflow to 0 (runtime) from pos");
455cmp_ok(-1e-9999,   '==', 0,     "underflow to 0 (compile time) from neg");
456cmp_ok('-1e-9999', '==', 0,     "underflow to 0 (runtime) from neg");
457
458# === Warnings triggered when and only when appropriate ===
459{
460    my $w;
461    local $SIG{__WARN__} = sub { $w = shift };
462    local $^W = 1;
463
464    my $T =
465        [
466         [ "inf",          0, $PInf ],
467         [ "infinity",     0, $PInf ],
468         [ "infxy",        1, $PInf ],
469         [ "inf34",        1, $PInf ],
470         [ "1.#INF",       0, $PInf ],
471         [ "1.#INFx",      1, $PInf ],
472         [ "1.#INF00",     0, $PInf ],
473         [ "1.#INFxy",     1, $PInf ],
474         [ " inf",         0, $PInf ],
475         [ "inf ",         0, $PInf ],
476         [ " inf ",        0, $PInf ],
477
478         [ "nan",          0, $NaN ],
479         [ "nanxy",        1, $NaN ],
480         [ "nan34",        1, $NaN ],
481         [ "nanq",         0, $NaN ],
482         [ "nans",         0, $NaN ],
483         [ "nanx",         1, $NaN ],
484         [ "nanqy",        1, $NaN ],
485         [ "nan(123)",     0, $NaN ],
486         [ "nan(0x123)",   0, $NaN ],
487         [ "nan(123xy)",   1, $NaN ],
488         [ "nan(0x123xy)", 1, $NaN ],
489         [ "nanq(123)",    0, $NaN ],
490         [ "nan(123",      1, $NaN ],
491         [ "nan(",         1, $NaN ],
492         [ "1.#NANQ",      0, $NaN ],
493         [ "1.#QNAN",      0, $NaN ],
494         [ "1.#NANQx",     1, $NaN ],
495         [ "1.#QNANx",     1, $NaN ],
496         [ "1.#IND",       0, $NaN ],
497         [ "1.#IND00",     0, $NaN ],
498         [ "1.#INDxy",     1, $NaN ],
499         [ " nan",         0, $NaN ],
500         [ "nan ",         0, $NaN ],
501         [ " nan ",        0, $NaN ],
502        ];
503
504    for my $t (@$T) {
505        print "# '$t->[0]' compile time\n";
506        my $a;
507        $w = '';
508        eval '$a = "'.$t->[0].'" + 1';
509        is("$a", "$t->[2]", "$t->[0] plus one is $t->[2]");
510        if ($t->[1]) {
511            like($w, qr/^Argument \Q"$t->[0]"\E isn't numeric/,
512                 "$t->[2] numify warn");
513        } else {
514            is($w, "", "no warning expected");
515        }
516        print "# '$t->[0]' runtime\n";
517        my $n = $t->[0];
518        my $b;
519        $w = '';
520        eval '$b = $n + 1';
521        is("$b", "$t->[2]", "$n plus one is $t->[2]");
522        if ($t->[1]) {
523            like($w, qr/^Argument \Q"$n"\E isn't numeric/,
524                 "$n numify warn");
525        } else {
526            is($w, "", "no warning expected");
527        }
528    }
529}
530
531# Size qualifiers shouldn't affect printing Inf/Nan
532#
533# Prior to the commit which introduced these tests and the fix,
534# the code path taken when int-ish formats saw an Inf/Nan was to
535# jump to the floating-point handler, but then that would
536# warn about (valid) qualifiers.
537
538{
539    my @w;
540    local $SIG{__WARN__} = sub { push @w, $_[0] };
541
542    for my $format (qw(B b c D d i O o U u X x)) {
543        # skip unportable: j L q
544        for my $size (qw(hh h l ll t z)) {
545            for my $num ($NInf, $PInf, $NaN) {
546                @w = ();
547                my $res = eval { sprintf "%${size}${format}", $num; };
548                my $desc = "sprintf(\"%${size}${format}\", $num)";
549                if ($format eq 'c') {
550                    like($@, qr/Cannot printf $num with 'c'/, "$desc: like");
551                }
552                else {
553                    is($res, $num, "$desc: equality");
554                }
555
556                is (@w, 0, "$desc: warnings")
557                    or do {
558                        diag("got warning: [$_]") for map { chomp; $_} @w;
559                    };
560            }
561        }
562    }
563}
564
565done_testing();
566