3 # Tests for sprintf that do not fit the format of sprintf.t.
11 # We'll run 12 extra tests (see below) if $Q is false.
12 eval { my $q = pack "q", 0 };
17 # %a and %A depend on the floating point config
18 # This totally doesn't test non-IEEE-754 float formats.
20 print "# uvsize = $Config{uvsize}\n";
21 print "# nvsize = $Config{nvsize}\n";
22 print "# nv_preserves_uv_bits = $Config{nv_preserves_uv_bits}\n";
23 print "# d_quad = $Config{d_quad}\n";
24 if ($Config{nvsize} == 8 &&
26 # IEEE-754 64-bit ("double precision"), the most common out there
27 ($Config{uvsize} == 8 && $Config{nv_preserves_uv_bits} == 53)
29 # If we have a quad we can still get the mantissa bits.
30 ($Config{uvsize} == 4 && $Config{d_quad})
34 [ '%a', '0', '0x0p+0' ],
35 [ '%a', '1', '0x1p+0' ],
36 [ '%a', '1.0', '0x1p+0' ],
37 [ '%a', '0.5', '0x1p-1' ],
38 [ '%a', '0.25', '0x1p-2' ],
39 [ '%a', '0.75', '0x1.8p-1' ],
40 [ '%a', '3.14', '0x1.91eb851eb851fp+1' ],
41 [ '%a', '-1.0', '-0x1p+0' ],
42 [ '%a', '-3.14', '-0x1.91eb851eb851fp+1' ],
43 [ '%a', '0.1', '0x1.999999999999ap-4' ],
44 [ '%a', '1/7', '0x1.2492492492492p-3' ],
45 [ '%a', 'sqrt(2)', '0x1.6a09e667f3bcdp+0' ],
46 [ '%a', 'exp(1)', '0x1.5bf0a8b145769p+1' ],
47 [ '%a', '2**-10', '0x1p-10' ],
48 [ '%a', '2**10', '0x1p+10' ],
49 [ '%a', '1e-9', '0x1.12e0be826d695p-30' ],
50 [ '%a', '1e9', '0x1.dcd65p+29' ],
52 [ '%#a', '1', '0x1.p+0' ],
53 [ '%+a', '1', '+0x1p+0' ],
54 [ '%+a', '-1', '-0x1p+0' ],
55 [ '% a', ' 1', ' 0x1p+0' ],
56 [ '% a', '-1', '-0x1p+0' ],
58 [ '%8a', '3.14', '0x1.91eb851eb851fp+1' ],
59 [ '%13a', '3.14', '0x1.91eb851eb851fp+1' ],
60 [ '%20a', '3.14', '0x1.91eb851eb851fp+1' ],
61 [ '%.4a', '3.14', '0x1.91ecp+1' ],
62 [ '%.5a', '3.14', '0x1.91eb8p+1' ],
63 [ '%.6a', '3.14', '0x1.91eb85p+1' ],
64 [ '%.20a', '3.14', '0x1.91eb851eb851f0000000p+1' ],
65 [ '%20.10a', '3.14', ' 0x1.91eb851eb8p+1' ],
66 [ '%20.15a', '3.14', '0x1.91eb851eb851f00p+1' ],
67 [ '% 20.10a', '3.14', ' 0x1.91eb851eb8p+1' ],
68 [ '%020.10a', '3.14', '0x0001.91eb851eb8p+1' ],
70 [ '%30a', '3.14', ' 0x1.91eb851eb851fp+1' ],
71 [ '%-30a', '3.14', '0x1.91eb851eb851fp+1 ' ],
72 [ '%030a', '3.14', '0x00000000001.91eb851eb851fp+1' ],
73 [ '%-030a', '3.14', '0x1.91eb851eb851fp+1 ' ],
76 '0x1.91eb851eb851f000000000000000000000000000p+1' ],
78 [ '%A', '3.14', '0X1.91EB851EB851FP+1' ],
80 } elsif (($Config{nvsize} == 16 || $Config{nvsize} == 12) &&
81 # 80-bit ("extended precision") long double, pack F is the NV
82 # cd cc cc cc cc cc cc cc fb bf 00 00 00 00 00 00
83 # cd cc cc cc cc cc cc cc fb bf 00 00
84 (pack("F", 0.1) =~ /^\xCD/ || # LE
85 pack("F", 0.1) =~ /\xCD$/)) { # BE (if this ever happens)
87 [ '%a', '0', '0x0p+0' ],
88 [ '%a', '1', '0x8p-3' ],
89 [ '%a', '1.0', '0x8p-3' ],
90 [ '%a', '0.5', '0x8p-4' ],
91 [ '%a', '0.25', '0x8p-5' ],
92 [ '%a', '0.75', '0xcp-4' ],
93 [ '%a', '3.14', '0xc.8f5c28f5c28f5c3p-2' ],
94 [ '%a', '-1.0', '-0x8p-3' ],
95 [ '%a', '-3.14', '-0xc.8f5c28f5c28f5c3p-2' ],
96 [ '%a', '0.1', '0xc.ccccccccccccccdp-7' ],
97 [ '%a', '1/7', '0x9.249249249249249p-6' ],
98 [ '%a', 'sqrt(2)', '0xb.504f333f9de6484p-3' ],
99 [ '%a', 'exp(1)', '0xa.df85458a2bb4a9bp-2' ],
100 [ '%a', '2**-10', '0x8p-13' ],
101 [ '%a', '2**10', '0x8p+7' ],
102 [ '%a', '1e-9', '0x8.9705f4136b4a597p-33' ],
103 [ '%a', '1e9', '0xe.e6b28p+26' ],
105 [ '%#a', '1', '0x8.p-3' ],
106 [ '%+a', '1', '+0x8p-3' ],
107 [ '%+a', '-1', '-0x8p-3' ],
108 [ '% a', ' 1', ' 0x8p-3' ],
109 [ '% a', '-1', '-0x8p-3' ],
111 [ '%8a', '3.14', '0xc.8f5c28f5c28f5c3p-2' ],
112 [ '%13a', '3.14', '0xc.8f5c28f5c28f5c3p-2' ],
113 [ '%20a', '3.14', '0xc.8f5c28f5c28f5c3p-2' ],
114 [ '%.4a', '3.14', '0xc.8f5cp-2' ],
115 [ '%.5a', '3.14', '0xc.8f5c3p-2' ],
116 [ '%.6a', '3.14', '0xc.8f5c29p-2' ],
117 [ '%.20a', '3.14', '0xc.8f5c28f5c28f5c300000p-2' ],
118 [ '%20.10a', '3.14', ' 0xc.8f5c28f5c3p-2' ],
119 [ '%20.15a', '3.14', '0xc.8f5c28f5c28f5c3p-2' ],
120 [ '% 20.10a', '3.14', ' 0xc.8f5c28f5c3p-2' ],
121 [ '%020.10a', '3.14', '0x000c.8f5c28f5c3p-2' ],
123 [ '%30a', '3.14', ' 0xc.8f5c28f5c28f5c3p-2' ],
124 [ '%-30a', '3.14', '0xc.8f5c28f5c28f5c3p-2 ' ],
125 [ '%030a', '3.14', '0x00000000c.8f5c28f5c28f5c3p-2' ],
126 [ '%-030a', '3.14', '0xc.8f5c28f5c28f5c3p-2 ' ],
129 '0xc.8f5c28f5c28f5c30000000000000000000000000p-2' ],
131 [ '%A', '3.14', '0XC.8F5C28F5C28F5C3P-2' ],
134 # IEEE 754 128-bit ("quadruple precision"), e.g. IA-64 (Itanium) in VMS
135 $Config{nvsize} == 16 &&
136 # 9a 99 99 99 99 99 99 99 99 99 99 99 99 99 fb 3f (LE), pack F is the NV
137 (pack("F", 0.1) =~ /^\x9A\x99{6}/ || # LE
138 pack("F", 0.1) =~ /\x99{6}\x9A$/) # BE
141 [ '%a', '0', '0x0p+0' ],
142 [ '%a', '1', '0x1p+0' ],
143 [ '%a', '1.0', '0x1p+0' ],
144 [ '%a', '0.5', '0x1p-1' ],
145 [ '%a', '0.25', '0x1p-2' ],
146 [ '%a', '0.75', '0x1.8p-1' ],
147 [ '%a', '3.14', '0x1.91eb851eb851eb851eb851eb851fp+1' ],
148 [ '%a', '-1', '-0x1p+0' ],
149 [ '%a', '-3.14', '-0x1.91eb851eb851eb851eb851eb851fp+1' ],
150 [ '%a', '0.1', '0x1.999999999999999999999999999ap-4' ],
151 [ '%a', '1/7', '0x1.2492492492492492492492492492p-3' ],
152 [ '%a', 'sqrt(2)', '0x1.6a09e667f3bcc908b2fb1366ea95p+0' ],
153 [ '%a', 'exp(1)', '0x1.5bf0a8b1457695355fb8ac404e7ap+1' ],
154 [ '%a', '2**-10', '0x1p-10' ],
155 [ '%a', '2**10', '0x1p+10' ],
156 [ '%a', '1e-09', '0x1.12e0be826d694b2e62d01511f12ap-30' ],
157 [ '%a', '1e9', '0x1.dcd65p+29' ],
159 [ '%#a', '1', '0x1.p+0' ],
160 [ '%+a', '1', '+0x1p+0' ],
161 [ '%+a', '-1', '-0x1p+0' ],
162 [ '% a', '1', ' 0x1p+0' ],
163 [ '% a', '-1', '-0x1p+0' ],
165 [ '%8a', '3.14', '0x1.91eb851eb851eb851eb851eb851fp+1' ],
166 [ '%13a', '3.14', '0x1.91eb851eb851eb851eb851eb851fp+1' ],
167 [ '%20a', '3.14', '0x1.91eb851eb851eb851eb851eb851fp+1' ],
168 [ '%.4a', '3.14', '0x1.91ecp+1' ],
169 [ '%.5a', '3.14', '0x1.91eb8p+1' ],
170 [ '%.6a', '3.14', '0x1.91eb85p+1' ],
171 [ '%.20a', '3.14', '0x1.91eb851eb851eb851eb8p+1' ],
172 [ '%20.10a', '3.14', ' 0x1.91eb851eb8p+1' ],
173 [ '%20.15a', '3.14', '0x1.91eb851eb851eb8p+1' ],
174 [ '% 20.10a', '3.14', ' 0x1.91eb851eb8p+1' ],
175 [ '%020.10a', '3.14', '0x0001.91eb851eb8p+1' ],
177 [ '%30a', '3.14', '0x1.91eb851eb851eb851eb851eb851fp+1' ],
178 [ '%-30a', '3.14', '0x1.91eb851eb851eb851eb851eb851fp+1' ],
179 [ '%030a', '3.14', '0x1.91eb851eb851eb851eb851eb851fp+1' ],
180 [ '%-030a', '3.14', '0x1.91eb851eb851eb851eb851eb851fp+1' ],
183 '0x1.91eb851eb851eb851eb851eb851f000000000000p+1' ],
185 [ '%A', '3.14', '0X1.91EB851EB851EB851EB851EB851FP+1' ],
188 # "double-double", two 64-bit doubles end to end
189 $Config{nvsize} == 16 &&
190 # bf b9 99 99 99 99 99 9a bc 59 99 99 99 99 99 9a (BE), pack F is the NV
191 (pack("F", 0.1) =~ /^\x9A\x99{5}\x59\xBC/ || # LE
192 pack("F", 0.1) =~ /\xBC\x59\x99{5}\x9A$/) # BE
196 [ '%a', '0', '0x0p+0' ],
197 [ '%a', '1', '0x1p+0' ],
198 [ '%a', '1.0', '0x1p+0' ],
199 [ '%a', '0.5', '0x1p-1' ],
200 [ '%a', '0.25', '0x1p-2' ],
201 [ '%a', '0.75', '0x1.8p-1' ],
202 [ '%a', '3.14', '0x1.91eb851eb851eb851eb851eb85p+1' ],
203 [ '%a', '-1', '-0x0p+0' ],
204 [ '%a', '-3.14', '-0x1.91eb851eb851eb851eb851eb85p+1' ],
205 [ '%a', '0.1', '0x1.999999999999999999999999998p-4' ],
206 [ '%a', '1/7', '0x1.249249249249249249249249248p-3' ],
207 [ '%a', 'sqrt(2)', '0x1.6a09e667f3bcc908b2fb1366ea8p+0' ],
208 [ '%a', 'exp(1)', '0x1.5bf0a8b1457695355fb8ac404e8p+1' ],
209 [ '%a', '2**-10', '0x1p-10' ],
210 [ '%a', '2**10', '0x1p+10' ],
211 [ '%a', '1e-09', '0x1.12e0be826d694b2e62d01511f14p-30' ],
212 [ '%a', '1e9', '0x1.dcd65p+29' ],
214 [ '%#a', '1', '0x1.p+0' ],
215 [ '%+a', '1', '+0x1p+0' ],
216 [ '%+a', '-1', '-0x1p+0' ],
217 [ '% a', '1', ' 0x1p+0' ],
218 [ '% a', '-1', '-0x1p+0' ],
220 [ '%8a', '3.14', '0x1.91eb851eb851eb851eb851eb85p+1' ],
221 [ '%13a', '3.14', '0x1.91eb851eb851eb851eb851eb85p+1' ],
222 [ '%20a', '3.14', '0x1.91eb851eb851eb851eb851eb85p+1' ],
223 [ '%.4a', '3.14', '0x1.91ecp+1' ],
224 [ '%.5a', '3.14', '0x1.91eb8p+1' ],
225 [ '%.6a', '3.14', '0x1.91eb85p+1' ],
226 [ '%.20a', '3.14', '0x1.91eb851eb851eb851eb8p+1' ],
227 [ '%20.10a', '3.14', ' 0x1.91eb851eb8p+1' ],
228 [ '%20.15a', '3.14', '0x1.91eb851eb851eb8p+1' ],
229 [ '% 20.10a', '3.14', ' 0x1.91eb851eb8p+1' ],
230 [ '%020.10a', '3.14', '0x0001.91eb851eb8p+1' ],
232 [ '%30a', '3.14', '0x1.91eb851eb851eb851eb851eb85p+1' ],
233 [ '%-30a', '3.14', '0x1.91eb851eb851eb851eb851eb85p+1' ],
234 [ '%030a', '3.14', '0x1.91eb851eb851eb851eb851eb85p+1' ],
235 [ '%-030a', '3.14', '0x1.91eb851eb851eb851eb851eb85p+1' ],
238 '0x1.91eb851eb851eb851eb851eb8500000000000000p+1' ],
240 [ '%A', '3.14', '0X1.91EB851EB851EB851EB851EB85P+1' ],
243 print "# no hexfloat tests\n";
246 plan tests => 1408 + ($Q ? 0 : 12) + @hexfloat + 6;
252 sprintf("%.40g ",0.01),
253 sprintf("%.40g", 0.01)." ",
254 q(the sprintf "%.<number>g" optimization)
257 sprintf("%.40f ",0.01),
258 sprintf("%.40f", 0.01)." ",
259 q(the sprintf "%.<number>f" optimization)
262 # cases of $i > 1 are against [perl #39126]
263 for my $i (1, 5, 10, 20, 50, 100) {
264 chop(my $utf8_format = "%-*s\x{100}");
265 my $string = "\xB4"x$i; # latin1 ACUTE or ebcdic COPYRIGHT
266 my $expect = $string." "x$i; # followed by 2*$i spaces
267 is(sprintf($utf8_format, 3*$i, $string), $expect,
268 "width calculation under utf8 upgrade, length=$i");
271 # check simultaneous width & precision with wide characters
272 for my $i (1, 3, 5, 10) {
273 my $string = "\x{0410}"x($i+10); # cyrillic capital A
274 my $expect = "\x{0410}"x$i; # cut down to exactly $i characters
275 my $format = "%$i.${i}s";
276 is(sprintf($format, $string), $expect,
277 "width & precision interplay with utf8 strings, length=$i");
280 # Used to mangle PL_sv_undef
282 'print sprintf "xxx%n\n"; print undef',
283 qr/Modification of a read-only value attempted at - line 1\./,
284 { switches => [ '-w' ] },
285 q(%n should not be able to modify read-only constants),
289 for (int(~0/2+1), ~0, "9999999999999999999") {
290 is(eval {sprintf "%${_}d", 0}, undef, "no sprintf result expected %${_}d");
291 like($@, qr/^Integer overflow in format string for sprintf /, "overflow in sprintf");
292 is(eval {printf "%${_}d\n", 0}, undef, "no printf result expected %${_}d");
293 like($@, qr/^Integer overflow in format string for printf /, "overflow in printf");
296 # check %NNN$ for range bounds
298 my ($warn, $bad) = (0,0);
299 local $SIG{__WARN__} = sub {
300 if ($_[0] =~ /missing argument/i) {
308 my $fmt = join('', map("%$_\$s%" . ((1 << 31)-$_) . '$s', 1..20));
309 my $result = sprintf $fmt, qw(a b c d);
310 is($result, "abcd", "only four valid values in $fmt");
311 is($warn, 36, "expected warnings");
312 is($bad, 0, "unexpected warnings");
315 # Tests for "missing argument" and "redundant argument" warnings
317 my ($warn_missing, $warn_redundant, $warn_bad) = (0,0,0);
318 local $SIG{__WARN__} = sub {
319 if ($_[0] =~ /missing argument/i) {
322 elsif ($_[0] =~ /redundant argument/i) {
331 # The "", "%s", and "%-p" formats have special-case handling
342 args => [ qw( x y ) ],
349 args => [ qw( x y ) ],
350 res => qr/^[0-9a-f]+$/as,
354 # Other non-specialcased patterns
357 args => [ qw( a b c ) ],
363 fmt => "%s : %s : %s",
364 args => [ qw( a b c d e ) ],
367 # Note how we'll only warn about redundant arguments once,
368 # even though both "d" and "e" are redundant...
372 fmt => "%s : %s : %s",
375 # ...But when arguments are missing we'll warn about every
376 # missing argument. This difference between the two
377 # warnings is a feature.
382 # Tests for format parameter indexes.
384 # Deciding what to do about these is a bit tricky, and so is
385 # "correctly" warning about missing arguments on them.
387 # Should we warn if you supply 4 arguments but only use
388 # argument 1,3 & 4? Or only if you supply 5 arguments and your
389 # highest used argument is 4?
391 # For some uses of this printf feature (e.g. i18n systems)
392 # it's a always a logic error to not print out every provided
393 # argument, but for some other uses skipping some might be a
394 # feature (although you could argue that then printf should be
397 # printf q[%1$s %3$s], x(), undef, z();
401 # printf q[%1$s %3$s], x(), y(), z();
403 # Since calling the (possibly expensive) y() function is
404 # completely redundant there.
406 # We deal with all these potential problems by not even
407 # trying. If the pattern contains any format parameter indexes
408 # whatsoever we'll never warn about redundant arguments.
410 fmt => '%1$s : %2$s',
411 args => [ qw( x y z ) ],
417 fmt => '%2$s : %4$s : %5$s',
418 args => [ qw( a b c d )],
424 fmt => '%s : %1$s : %s',
425 args => [ qw( x y z ) ],
433 for my $i (0..$#tests) {
434 my $test = $tests[$i];
435 my $result = sprintf $test->{fmt}, @{$test->{args}};
437 my $prefix = "For format '$test->{fmt}' and arguments/result '@{$test->{args}}'/'$result'";
438 if (ref $test->{res} eq 'Regexp') {
439 like($result, $test->{res}, "$prefix got the right result");
441 is($result, $test->{res}, "$prefix got the right result");
443 is($warn_missing, $test->{m}, "$prefix got '$test->{m}' 'missing argument' warnings");
444 is($warn_redundant, $test->{r}, "$prefix got '$test->{r}' 'redundant argument' warnings");
445 is($warn_bad, 0, "$prefix No unknown warnings");
447 ($warn_missing, $warn_redundant, $warn_bad) = (0,0,0);
452 foreach my $ord (0 .. 255) {
454 local $SIG{__WARN__} = sub {
455 if ($_[0] !~ /^Invalid conversion in sprintf/) {
460 my $r = eval {sprintf '%v' . chr $ord};
461 is ($bad, 0, "pattern '%v' . chr $ord");
465 sub mysprintf_int_flags {
466 my ($fmt, $num) = @_;
467 die "wrong format $fmt" if $fmt !~ /^%([-+ 0]+)([1-9][0-9]*)d\z/;
470 my $sign = $num < 0 ? '-' :
471 $flag =~ /\+/ ? '+' :
472 $flag =~ /\ / ? ' ' :
475 my $padlen = $width - length($sign.$abs);
477 $flag =~ /0/ && $flag !~ /-/ # do zero padding
478 ? $sign . '0' x $padlen . $abs
479 : $flag =~ /-/ # left or right
480 ? $sign . $abs . ' ' x $padlen
481 : ' ' x $padlen . $sign . $abs;
484 # Whole tests for "%4d" with 2 to 4 flags;
485 # total counts: 3 * (4**2 + 4**3 + 4**4) == 1008
487 my @flags = ("-", "+", " ", "0");
488 for my $num (0, -1, 1) {
489 for my $f1 (@flags) {
490 for my $f2 (@flags) {
491 for my $f3 ('', @flags) { # '' for doubled flags
492 my $flag = $f1.$f2.$f3;
494 my $fmt = '%'."${flag}${width}d";
495 my $result = sprintf($fmt, $num);
496 my $expect = mysprintf_int_flags($fmt, $num);
497 is($result, $expect, qq/sprintf("$fmt",$num)/);
501 for my $f4 (@flags) { # quadrupled flags
502 my $flag = $f1.$f2.$f3.$f4;
503 my $fmt = '%'."${flag}${width}d";
504 my $result = sprintf($fmt, $num);
505 my $expect = mysprintf_int_flags($fmt, $num);
506 is($result, $expect, qq/sprintf("$fmt",$num)/);
513 # test that %f doesn't panic with +Inf, -Inf, NaN [perl #45383]
514 foreach my $n (2**1e100, -2**1e100, 2**1e100/2**1e100) { # +Inf, -Inf, NaN
515 eval { my $f = sprintf("%f", $n); };
516 is $@, "", "sprintf(\"%f\", $n)";
519 # test %ll formats with and without HAS_QUAD
521 [ '%lld' => [qw( 4294967296 -100000000000000 )] ],
522 [ '%lli' => [qw( 4294967296 -100000000000000 )] ],
523 [ '%llu' => [qw( 4294967296 100000000000000 )] ],
524 [ '%Ld' => [qw( 4294967296 -100000000000000 )] ],
525 [ '%Li' => [qw( 4294967296 -100000000000000 )] ],
526 [ '%Lu' => [qw( 4294967296 100000000000000 )] ],
530 my($fmt, $nums) = @$t;
531 for my $num (@$nums) {
533 local $SIG{__WARN__} = sub { $w .= shift };
534 my $sprintf_got = sprintf($fmt, $num);
536 is($sprintf_got, $num, "quad: $fmt -> $num");
537 is($w, '', "no warnings for: $fmt -> $num");
539 is($sprintf_got, $fmt, "quad unsupported: $fmt -> $fmt");
540 like($w, qr/Invalid conversion in sprintf: "$fmt"/, "got warning about invalid conversion from fmt : $fmt");
541 like($w, qr/Redundant argument in sprintf/, "got warning about redundant argument in sprintf from fmt : $fmt");
546 # Check unicode vs byte length
547 for my $width (1,2,3,4,5,6,7) {
548 for my $precis (1,2,3,4,5,6,7) {
549 my $v = "\x{20ac}\x{20ac}";
550 my $format = "%" . $width . "." . $precis . "s";
551 my $chars = ($precis > 2 ? 2 : $precis);
552 my $space = ($width < 2 ? 0 : $width - $chars);
554 'my $v = "\x{20ac}\x{20ac}"; my $x = sprintf "'.$format.'", $v; $x =~ /^(\s*)(\S*)$/; print "$_" for map {length} $1, $2',
557 q(sprintf ").$format.q(", "\x{20ac}\x{20ac}"),
565 '""', sub { ++our $count; $_[0][0]; },
566 '0+', sub { ++our $numcount; $_[0][1]; }
568 my $o = bless ["\x{100}",42], o::;
569 () = sprintf "%1s", $o;
570 is $o::count, '1', 'sprinf %1s overload count';
572 () = sprintf "%.1s", $o;
573 is $o::count, '1', 'sprinf %.1s overload count';
575 () = sprintf "%d", $o;
576 is $o::count, 0, 'sprintf %d string overload count is 0';
577 is $o::numcount, 1, 'sprintf %d number overload count is 1';
579 my $ppc64_linux = $Config{archname} =~ /^ppc64-linux/;
581 for my $t (@hexfloat) {
582 my ($format, $arg, $expected) = @$t;
584 my $result = sprintf($format, $arg);
585 my $ok = $result eq $expected;
586 if ($doubledouble && $ppc64_linux && $arg =~ /^2.71828/) {
587 # ppc64-linux has buggy exp(1).
588 local $::TODO = "$Config{archname} exp(1)";
589 ok($ok, "'$format' '$arg' -> '$result' cf '$expected'");
593 # It seems that there can be difference in the last bits:
595 # got "0x1.5bf0a8b14576ap+1"
596 # expected "0x1.5bf0a8b145769p+1"
599 # Exact cause unknown but suspecting different fp rounding modes,
600 # (towards zero? towards +inf? towards -inf?) about which Perl
601 # is blissfully unaware.
603 # Try extracting one (or sometimes two) last mantissa
604 # hexdigits, and see if they differ in value by one.
605 my ($rh, $eh) = ($result, $expected);
607 ($_[0] =~ s/(-?0x[0-9a-fA-F]+\.)//) && return $1;
609 my $rp = extract_prefix($rh);
610 my $ep = extract_prefix($eh);
611 print "# rp = $rp, ep = $ep (rh $rh, eh $eh)\n";
612 if ($rp eq $ep) { # If prefixes match.
613 sub extract_exponent {
614 ($_[0] =~ s/([pP][+-]?\d+)//) && return $1;
616 my $re = extract_exponent($rh);
617 my $ee = extract_exponent($eh);
618 print "# re = $re, ee = $ee (rh $rh, eh $eh)\n";
619 if ($re eq $ee) { # If exponents match.
620 # Remove the common prefix of the mantissa bits.
621 my $la = length($rh);
622 my $lb = length($eh);
624 for ($i = 0; $i < $la && $i < $lb; $i++) {
625 last if substr($rh, $i, 1) ne substr($eh, $i, 1);
627 $rh = substr($rh, $i);
628 $eh = substr($eh, $i);
629 print "# (rh $rh, eh $eh)\n";
631 # If necessary, pad the shorter one on the right
632 # with one zero (for example "...1f" vs "...2",
633 # we want to compare "1f" to "20").
634 if (length $rh < length $eh) {
636 } elsif (length $eh < length $rh) {
639 print "# (rh $rh, eh $eh)\n";
640 if (length $eh == length $rh) {
641 if (abs(hex($eh) - hex($rh)) == 1) {
649 ok($ok, "'$format' '$arg' -> '$result' cf '$expected'");
652 # double-double long double %a special testing.
654 skip("$^O doublekind=$Config{doublekind}", 6)
655 unless ($Config{doublekind} == 4 && $^O eq 'linux');
656 # [rt.perl.org 125633]
657 like(sprintf("%La\n", (2**1020) + (2**-1072)),
658 qr/^0x1.0{522}1p\+1020$/);
659 like(sprintf("%La\n", (2**1021) + (2**-1072)),
660 qr/^0x1.0{523}8p\+1021$/);
661 like(sprintf("%La\n", (2**1022) + (2**-1072)),
662 qr/^0x1.0{523}4p\+1022$/);
663 like(sprintf("%La\n", (2**1023) + (2**-1072)),
664 qr/^0x1.0{523}2p\+1023$/);
665 like(sprintf("%La\n", (2**1023) + (2**-1073)),
666 qr/^0x1.0{523}1p\+1023$/);
667 like(sprintf("%La\n", (2**1023) + (2**-1074)),
668 qr/^0x1.0{524}8p\+1023$/);