tests/test-strtod.c

   1 /*
   2  * Copyright (C) 2008-2021 Free Software Foundation, Inc.
   3  * Written by Eric Blake
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 #include <stdlib.h>
  21
  22 #include "signature.h"
  23 SIGNATURE_CHECK (strtod, double, (char const *, char **));
  24
  25 #include <errno.h>
  26 #include <float.h>
  27 #include <math.h>
  28 #include <string.h>
  29
  30 #include "isnand-nolibm.h"
  31 #include "minus-zero.h"
  32 #include "macros.h"
  33
  34 /* Avoid requiring -lm just for fabs.  */
  35 #define FABS(d) ((d) < 0.0 ? -(d) : (d))
  36
  37 int
  38 main (void)
  39 {
  40   int status = 0;
  41   /* Subject sequence empty or invalid.  */
  42   {
  43     const char input[] = "";
  44     char *ptr;
  45     double result;
  46     errno = 0;
  47     result = strtod (input, &ptr);
  48     ASSERT (result == 0.0);
  49     ASSERT (!signbit (result));
  50     ASSERT (ptr == input);
  51     ASSERT (errno == 0 || errno == EINVAL);
  52   }
  53   {
  54     const char input[] = " ";
  55     char *ptr;
  56     double result;
  57     errno = 0;
  58     result = strtod (input, &ptr);
  59     ASSERT (result == 0.0);
  60     ASSERT (!signbit (result));
  61     ASSERT (ptr == input);
  62     ASSERT (errno == 0 || errno == EINVAL);
  63   }
  64   {
  65     const char input[] = " +";
  66     char *ptr;
  67     double result;
  68     errno = 0;
  69     result = strtod (input, &ptr);
  70     ASSERT (result == 0.0);
  71     ASSERT (!signbit (result));
  72     ASSERT (ptr == input);
  73     ASSERT (errno == 0 || errno == EINVAL);
  74   }
  75   {
  76     const char input[] = " .";
  77     char *ptr;
  78     double result;
  79     errno = 0;
  80     result = strtod (input, &ptr);
  81     ASSERT (result == 0.0);
  82     ASSERT (!signbit (result));
  83     ASSERT (ptr == input);
  84     ASSERT (errno == 0 || errno == EINVAL);
  85   }
  86   {
  87     const char input[] = " .e0";
  88     char *ptr;
  89     double result;
  90     errno = 0;
  91     result = strtod (input, &ptr);
  92     ASSERT (result == 0.0);
  93     ASSERT (!signbit (result));
  94     ASSERT (ptr == input);              /* IRIX 6.5, OSF/1 5.1 */
  95     ASSERT (errno == 0 || errno == EINVAL);
  96   }
  97   {
  98     const char input[] = " +.e-0";
  99     char *ptr;
 100     double result;
 101     errno = 0;
 102     result = strtod (input, &ptr);
 103     ASSERT (result == 0.0);
 104     ASSERT (!signbit (result));
 105     ASSERT (ptr == input);              /* IRIX 6.5, OSF/1 5.1 */
 106     ASSERT (errno == 0 || errno == EINVAL);
 107   }
 108   {
 109     const char input[] = " in";
 110     char *ptr;
 111     double result;
 112     errno = 0;
 113     result = strtod (input, &ptr);
 114     ASSERT (result == 0.0);
 115     ASSERT (!signbit (result));
 116     ASSERT (ptr == input);
 117     ASSERT (errno == 0 || errno == EINVAL);
 118   }
 119   {
 120     const char input[] = " na";
 121     char *ptr;
 122     double result;
 123     errno = 0;
 124     result = strtod (input, &ptr);
 125     ASSERT (result == 0.0);
 126     ASSERT (!signbit (result));
 127     ASSERT (ptr == input);
 128     ASSERT (errno == 0 || errno == EINVAL);
 129   }
 130
 131   /* Simple floating point values.  */
 132   {
 133     const char input[] = "1";
 134     char *ptr;
 135     double result;
 136     errno = 0;
 137     result = strtod (input, &ptr);
 138     ASSERT (result == 1.0);
 139     ASSERT (ptr == input + 1);
 140     ASSERT (errno == 0);
 141   }
 142   {
 143     const char input[] = "1.";
 144     char *ptr;
 145     double result;
 146     errno = 0;
 147     result = strtod (input, &ptr);
 148     ASSERT (result == 1.0);
 149     ASSERT (ptr == input + 2);
 150     ASSERT (errno == 0);
 151   }
 152   {
 153     const char input[] = ".5";
 154     char *ptr;
 155     double result;
 156     errno = 0;
 157     result = strtod (input, &ptr);
 158     ASSERT (result == 0.5);
 159     ASSERT (ptr == input + 2);
 160     ASSERT (errno == 0);
 161   }
 162   {
 163     const char input[] = " 1";
 164     char *ptr;
 165     double result;
 166     errno = 0;
 167     result = strtod (input, &ptr);
 168     ASSERT (result == 1.0);
 169     ASSERT (ptr == input + 2);
 170     ASSERT (errno == 0);
 171   }
 172   {
 173     const char input[] = "+1";
 174     char *ptr;
 175     double result;
 176     errno = 0;
 177     result = strtod (input, &ptr);
 178     ASSERT (result == 1.0);
 179     ASSERT (ptr == input + 2);
 180     ASSERT (errno == 0);
 181   }
 182   {
 183     const char input[] = "-1";
 184     char *ptr;
 185     double result;
 186     errno = 0;
 187     result = strtod (input, &ptr);
 188     ASSERT (result == -1.0);
 189     ASSERT (ptr == input + 2);
 190     ASSERT (errno == 0);
 191   }
 192   {
 193     const char input[] = "1e0";
 194     char *ptr;
 195     double result;
 196     errno = 0;
 197     result = strtod (input, &ptr);
 198     ASSERT (result == 1.0);
 199     ASSERT (ptr == input + 3);
 200     ASSERT (errno == 0);
 201   }
 202   {
 203     const char input[] = "1e+0";
 204     char *ptr;
 205     double result;
 206     errno = 0;
 207     result = strtod (input, &ptr);
 208     ASSERT (result == 1.0);
 209     ASSERT (ptr == input + 4);
 210     ASSERT (errno == 0);
 211   }
 212   {
 213     const char input[] = "1e-0";
 214     char *ptr;
 215     double result;
 216     errno = 0;
 217     result = strtod (input, &ptr);
 218     ASSERT (result == 1.0);
 219     ASSERT (ptr == input + 4);
 220     ASSERT (errno == 0);
 221   }
 222   {
 223     const char input[] = "1e1";
 224     char *ptr;
 225     double result;
 226     errno = 0;
 227     result = strtod (input, &ptr);
 228     ASSERT (result == 10.0);
 229     ASSERT (ptr == input + 3);
 230     ASSERT (errno == 0);
 231   }
 232   {
 233     const char input[] = "5e-1";
 234     char *ptr;
 235     double result;
 236     errno = 0;
 237     result = strtod (input, &ptr);
 238     ASSERT (result == 0.5);
 239     ASSERT (ptr == input + 4);
 240     ASSERT (errno == 0);
 241   }
 242
 243   /* Zero.  */
 244   {
 245     const char input[] = "0";
 246     char *ptr;
 247     double result;
 248     errno = 0;
 249     result = strtod (input, &ptr);
 250     ASSERT (result == 0.0);
 251     ASSERT (!signbit (result));
 252     ASSERT (ptr == input + 1);
 253     ASSERT (errno == 0);
 254   }
 255   {
 256     const char input[] = ".0";
 257     char *ptr;
 258     double result;
 259     errno = 0;
 260     result = strtod (input, &ptr);
 261     ASSERT (result == 0.0);
 262     ASSERT (!signbit (result));
 263     ASSERT (ptr == input + 2);
 264     ASSERT (errno == 0);
 265   }
 266   {
 267     const char input[] = "0e0";
 268     char *ptr;
 269     double result;
 270     errno = 0;
 271     result = strtod (input, &ptr);
 272     ASSERT (result == 0.0);
 273     ASSERT (!signbit (result));
 274     ASSERT (ptr == input + 3);
 275     ASSERT (errno == 0);
 276   }
 277   {
 278     const char input[] = "0e+9999999";
 279     char *ptr;
 280     double result;
 281     errno = 0;
 282     result = strtod (input, &ptr);
 283     ASSERT (result == 0.0);
 284     ASSERT (!signbit (result));
 285     ASSERT (ptr == input + 10);
 286     ASSERT (errno == 0);
 287   }
 288   {
 289     const char input[] = "0e-9999999";
 290     char *ptr;
 291     double result;
 292     errno = 0;
 293     result = strtod (input, &ptr);
 294     ASSERT (result == 0.0);
 295     ASSERT (!signbit (result));
 296     ASSERT (ptr == input + 10);
 297     ASSERT (errno == 0);
 298   }
 299   {
 300     const char input[] = "-0";
 301     char *ptr;
 302     double result;
 303     errno = 0;
 304     result = strtod (input, &ptr);
 305     ASSERT (result == 0.0);
 306     ASSERT (!!signbit (result) == !!signbit (minus_zerod)); /* IRIX 6.5, OSF/1 4.0 */
 307     ASSERT (ptr == input + 2);
 308     ASSERT (errno == 0);
 309   }
 310
 311   /* Suffixes.  */
 312   {
 313     const char input[] = "1f";
 314     char *ptr;
 315     double result;
 316     errno = 0;
 317     result = strtod (input, &ptr);
 318     ASSERT (result == 1.0);
 319     ASSERT (ptr == input + 1);
 320     ASSERT (errno == 0);
 321   }
 322   {
 323     const char input[] = "1.f";
 324     char *ptr;
 325     double result;
 326     errno = 0;
 327     result = strtod (input, &ptr);
 328     ASSERT (result == 1.0);
 329     ASSERT (ptr == input + 2);
 330     ASSERT (errno == 0);
 331   }
 332   {
 333     const char input[] = "1e";
 334     char *ptr;
 335     double result;
 336     errno = 0;
 337     result = strtod (input, &ptr);
 338     ASSERT (result == 1.0);
 339     ASSERT (ptr == input + 1);
 340     ASSERT (errno == 0);
 341   }
 342   {
 343     const char input[] = "1e+";
 344     char *ptr;
 345     double result;
 346     errno = 0;
 347     result = strtod (input, &ptr);
 348     ASSERT (result == 1.0);
 349     ASSERT (ptr == input + 1);
 350     ASSERT (errno == 0);
 351   }
 352   {
 353     const char input[] = "1e-";
 354     char *ptr;
 355     double result;
 356     errno = 0;
 357     result = strtod (input, &ptr);
 358     ASSERT (result == 1.0);
 359     ASSERT (ptr == input + 1);
 360     ASSERT (errno == 0);
 361   }
 362   {
 363     const char input[] = "1E 2";
 364     char *ptr;
 365     double result;
 366     errno = 0;
 367     result = strtod (input, &ptr);
 368     ASSERT (result == 1.0);             /* HP-UX 11.11, IRIX 6.5, OSF/1 4.0 */
 369     ASSERT (ptr == input + 1);          /* HP-UX 11.11, IRIX 6.5 */
 370     ASSERT (errno == 0);
 371   }
 372   {
 373     const char input[] = "0x";
 374     char *ptr;
 375     double result;
 376     errno = 0;
 377     result = strtod (input, &ptr);
 378     ASSERT (result == 0.0);
 379     ASSERT (!signbit (result));
 380     ASSERT (ptr == input + 1);          /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, AIX 7.1 */
 381     ASSERT (errno == 0);
 382   }
 383   {
 384     const char input[] = "00x1";
 385     char *ptr;
 386     double result;
 387     errno = 0;
 388     result = strtod (input, &ptr);
 389     ASSERT (result == 0.0);
 390     ASSERT (!signbit (result));
 391     ASSERT (ptr == input + 2);
 392     ASSERT (errno == 0);
 393   }
 394   {
 395     const char input[] = "-0x";
 396     char *ptr;
 397     double result;
 398     errno = 0;
 399     result = strtod (input, &ptr);
 400     ASSERT (result == 0.0);
 401     ASSERT (!!signbit (result) == !!signbit (minus_zerod)); /* Mac OS X 10.3, FreeBSD 6.2, IRIX 6.5, OSF/1 4.0 */
 402     ASSERT (ptr == input + 2);          /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, AIX 7.1 */
 403     ASSERT (errno == 0);
 404   }
 405   {
 406     const char input[] = "0xg";
 407     char *ptr;
 408     double result;
 409     errno = 0;
 410     result = strtod (input, &ptr);
 411     ASSERT (result == 0.0);
 412     ASSERT (!signbit (result));
 413     ASSERT (ptr == input + 1);          /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, AIX 7.1 */
 414     ASSERT (errno == 0);
 415   }
 416   {
 417     const char input[] = "0xp";
 418     char *ptr;
 419     double result;
 420     errno = 0;
 421     result = strtod (input, &ptr);
 422     ASSERT (result == 0.0);
 423     ASSERT (!signbit (result));
 424     ASSERT (ptr == input + 1);          /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, AIX 7.1 */
 425     ASSERT (errno == 0);
 426   }
 427   {
 428     const char input[] = "0XP";
 429     char *ptr;
 430     double result;
 431     errno = 0;
 432     result = strtod (input, &ptr);
 433     ASSERT (result == 0.0);
 434     ASSERT (!signbit (result));
 435     ASSERT (ptr == input + 1);          /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, AIX 7.1 */
 436     ASSERT (errno == 0);
 437   }
 438   {
 439     const char input[] = "0x.";
 440     char *ptr;
 441     double result;
 442     errno = 0;
 443     result = strtod (input, &ptr);
 444     ASSERT (result == 0.0);
 445     ASSERT (!signbit (result));
 446     ASSERT (ptr == input + 1);          /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, AIX 7.1 */
 447     ASSERT (errno == 0);
 448   }
 449   {
 450     const char input[] = "0xp+";
 451     char *ptr;
 452     double result;
 453     errno = 0;
 454     result = strtod (input, &ptr);
 455     ASSERT (result == 0.0);
 456     ASSERT (!signbit (result));
 457     ASSERT (ptr == input + 1);          /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, AIX 7.1 */
 458     ASSERT (errno == 0);
 459   }
 460   {
 461     const char input[] = "0xp+1";
 462     char *ptr;
 463     double result;
 464     errno = 0;
 465     result = strtod (input, &ptr);
 466     ASSERT (result == 0.0);
 467     ASSERT (!signbit (result));
 468     ASSERT (ptr == input + 1);          /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, AIX 7.1 */
 469     ASSERT (errno == 0);
 470   }
 471   {
 472     const char input[] = "0x.p+1";
 473     char *ptr;
 474     double result;
 475     errno = 0;
 476     result = strtod (input, &ptr);
 477     ASSERT (result == 0.0);
 478     ASSERT (!signbit (result));
 479     ASSERT (ptr == input + 1);          /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, AIX 7.1 */
 480     ASSERT (errno == 0);
 481   }
 482   {
 483     const char input[] = "1p+1";
 484     char *ptr;
 485     double result;
 486     errno = 0;
 487     result = strtod (input, &ptr);
 488     ASSERT (result == 1.0);
 489     ASSERT (ptr == input + 1);
 490     ASSERT (errno == 0);
 491   }
 492   {
 493     const char input[] = "1P+1";
 494     char *ptr;
 495     double result;
 496     errno = 0;
 497     result = strtod (input, &ptr);
 498     ASSERT (result == 1.0);
 499     ASSERT (ptr == input + 1);
 500     ASSERT (errno == 0);
 501   }
 502
 503   /* Overflow/underflow.  */
 504   {
 505     const char input[] = "1E1000000";
 506     char *ptr;
 507     double result;
 508     errno = 0;
 509     result = strtod (input, &ptr);
 510     ASSERT (result == HUGE_VAL);
 511     ASSERT (ptr == input + 9);          /* OSF/1 5.1 */
 512     ASSERT (errno == ERANGE);
 513   }
 514   {
 515     const char input[] = "-1E1000000";
 516     char *ptr;
 517     double result;
 518     errno = 0;
 519     result = strtod (input, &ptr);
 520     ASSERT (result == -HUGE_VAL);
 521     ASSERT (ptr == input + 10);
 522     ASSERT (errno == ERANGE);
 523   }
 524   {
 525     const char input[] = "1E-100000";
 526     char *ptr;
 527     double result;
 528     errno = 0;
 529     result = strtod (input, &ptr);
 530     ASSERT (0.0 <= result && result <= DBL_MIN);
 531     ASSERT (!signbit (result));
 532     ASSERT (ptr == input + 9);
 533     ASSERT (errno == ERANGE);
 534   }
 535   {
 536     const char input[] = "-1E-100000";
 537     char *ptr;
 538     double result;
 539     errno = 0;
 540     result = strtod (input, &ptr);
 541     ASSERT (-DBL_MIN <= result && result <= 0.0);
 542 #if 0
 543     /* FIXME - this is glibc bug 5995; POSIX allows returning positive
 544        0 on negative underflow, even though quality of implementation
 545        demands preserving the sign.  Disable this test until fixed
 546        glibc is more prevalent.  */
 547     ASSERT (!!signbit (result) == !!signbit (minus_zerod)); /* glibc-2.3.6, mingw */
 548 #endif
 549     ASSERT (ptr == input + 10);
 550     ASSERT (errno == ERANGE);
 551   }
 552   {
 553     const char input[] = "1E 1000000";
 554     char *ptr;
 555     double result;
 556     errno = 0;
 557     result = strtod (input, &ptr);
 558     ASSERT (result == 1.0);             /* HP-UX 11.11, IRIX 6.5, OSF/1 4.0 */
 559     ASSERT (ptr == input + 1);          /* HP-UX 11.11, IRIX 6.5 */
 560     ASSERT (errno == 0);
 561   }
 562   {
 563     const char input[] = "0x1P 1000000";
 564     char *ptr;
 565     double result;
 566     errno = 0;
 567     result = strtod (input, &ptr);
 568     ASSERT (result == 1.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 569     ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 570     ASSERT (errno == 0);
 571   }
 572
 573   /* Infinity.  */
 574   {
 575     const char input[] = "iNf";
 576     char *ptr;
 577     double result;
 578     errno = 0;
 579     result = strtod (input, &ptr);
 580     ASSERT (result == HUGE_VAL);        /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
 581     ASSERT (ptr == input + 3);          /* OpenBSD 4.0, HP-UX 11.00, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw */
 582     ASSERT (errno == 0);                /* HP-UX 11.11, OSF/1 4.0 */
 583   }
 584   {
 585     const char input[] = "-InF";
 586     char *ptr;
 587     double result;
 588     errno = 0;
 589     result = strtod (input, &ptr);
 590     ASSERT (result == -HUGE_VAL);       /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
 591     ASSERT (ptr == input + 4);          /* OpenBSD 4.0, HP-UX 11.00, IRIX 6.5, OSF/1 4.0, Solaris 9, mingw */
 592     ASSERT (errno == 0);                /* HP-UX 11.11, OSF/1 4.0 */
 593   }
 594   {
 595     const char input[] = "infinite";
 596     char *ptr;
 597     double result;
 598     errno = 0;
 599     result = strtod (input, &ptr);
 600     ASSERT (result == HUGE_VAL);        /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 601     ASSERT (ptr == input + 3);          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 602     ASSERT (errno == 0);                /* OSF/1 4.0 */
 603   }
 604   {
 605     const char input[] = "infinitY";
 606     char *ptr;
 607     double result;
 608     errno = 0;
 609     result = strtod (input, &ptr);
 610     ASSERT (result == HUGE_VAL);        /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
 611     ASSERT (ptr == input + 8);          /* OpenBSD 4.0, HP-UX 11.00, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw */
 612     ASSERT (errno == 0);                /* HP-UX 11.11, OSF/1 4.0 */
 613   }
 614   {
 615     const char input[] = "infinitY.";
 616     char *ptr;
 617     double result;
 618     errno = 0;
 619     result = strtod (input, &ptr);
 620     ASSERT (result == HUGE_VAL);        /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 621     ASSERT (ptr == input + 8);          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 622     ASSERT (errno == 0);                /* OSF/1 4.0 */
 623   }
 624
 625   /* NaN.  Some processors set the sign bit of the default NaN, so all
 626      we check is that using a sign changes the result.  */
 627   {
 628     const char input[] = "-nan";
 629     char *ptr1;
 630     char *ptr2;
 631     double result1;
 632     double result2;
 633     errno = 0;
 634     result1 = strtod (input, &ptr1);
 635     result2 = strtod (input + 1, &ptr2);
 636 #if 1 /* All known CPUs support NaNs.  */
 637     ASSERT (isnand (result1));          /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
 638     ASSERT (isnand (result2));          /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
 639 # if 0
 640     /* Sign bits of NaN is a portability sticking point, not worth
 641        worrying about.  */
 642     ASSERT (!!signbit (result1) != !!signbit (result2)); /* glibc-2.3.6, IRIX 6.5, OSF/1 5.1, mingw */
 643 # endif
 644     ASSERT (ptr1 == input + 4);         /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, Solaris 2.5.1, mingw */
 645     ASSERT (ptr2 == input + 4);         /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, Solaris 2.5.1, mingw */
 646     ASSERT (errno == 0);                /* HP-UX 11.11 */
 647 #else
 648     ASSERT (result1 == 0.0);
 649     ASSERT (result2 == 0.0);
 650     ASSERT (!signbit (result1));
 651     ASSERT (!signbit (result2));
 652     ASSERT (ptr1 == input);
 653     ASSERT (ptr2 == input + 1);
 654     ASSERT (errno == 0 || errno == EINVAL);
 655 #endif
 656   }
 657   {
 658     const char input[] = "+nan(";
 659     char *ptr1;
 660     char *ptr2;
 661     double result1;
 662     double result2;
 663     errno = 0;
 664     result1 = strtod (input, &ptr1);
 665     result2 = strtod (input + 1, &ptr2);
 666 #if 1 /* All known CPUs support NaNs.  */
 667     ASSERT (isnand (result1));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 668     ASSERT (isnand (result2));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 669     ASSERT (!!signbit (result1) == !!signbit (result2));
 670     ASSERT (ptr1 == input + 4);         /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 2.5.1, mingw */
 671     ASSERT (ptr2 == input + 4);         /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 2.5.1, mingw */
 672     ASSERT (errno == 0);
 673 #else
 674     ASSERT (result1 == 0.0);
 675     ASSERT (result2 == 0.0);
 676     ASSERT (!signbit (result1));
 677     ASSERT (!signbit (result2));
 678     ASSERT (ptr1 == input);
 679     ASSERT (ptr2 == input + 1);
 680     ASSERT (errno == 0 || errno == EINVAL);
 681 #endif
 682   }
 683   {
 684     const char input[] = "-nan()";
 685     char *ptr1;
 686     char *ptr2;
 687     double result1;
 688     double result2;
 689     errno = 0;
 690     result1 = strtod (input, &ptr1);
 691     result2 = strtod (input + 1, &ptr2);
 692 #if 1 /* All known CPUs support NaNs.  */
 693     ASSERT (isnand (result1));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 694     ASSERT (isnand (result2));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 695 # if 0
 696     /* Sign bits of NaN is a portability sticking point, not worth
 697        worrying about.  */
 698     ASSERT (!!signbit (result1) != !!signbit (result2)); /* glibc-2.3.6, IRIX 6.5, OSF/1 5.1, mingw */
 699 # endif
 700     ASSERT (ptr1 == input + 6);         /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 701     ASSERT (ptr2 == input + 6);         /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 702     ASSERT (errno == 0);
 703 #else
 704     ASSERT (result1 == 0.0);
 705     ASSERT (result2 == 0.0);
 706     ASSERT (!signbit (result1));
 707     ASSERT (!signbit (result2));
 708     ASSERT (ptr1 == input);
 709     ASSERT (ptr2 == input + 1);
 710     ASSERT (errno == 0 || errno == EINVAL);
 711 #endif
 712   }
 713   {
 714     const char input[] = " nan().";
 715     char *ptr;
 716     double result;
 717     errno = 0;
 718     result = strtod (input, &ptr);
 719 #if 1 /* All known CPUs support NaNs.  */
 720     ASSERT (isnand (result));           /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 721     ASSERT (ptr == input + 6);          /* glibc-2.3.6, Mac OS X 10.3, FreeBSD 6.2, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 722     ASSERT (errno == 0);
 723 #else
 724     ASSERT (result == 0.0);
 725     ASSERT (!signbit (result));
 726     ASSERT (ptr == input);
 727     ASSERT (errno == 0 || errno == EINVAL);
 728 #endif
 729   }
 730   {
 731     /* The behavior of nan(0) is implementation-defined, but all
 732        implementations we know of which handle optional
 733        n-char-sequences handle nan(0) the same as nan().  */
 734     const char input[] = "-nan(0).";
 735     char *ptr1;
 736     char *ptr2;
 737     double result1;
 738     double result2;
 739     errno = 0;
 740     result1 = strtod (input, &ptr1);
 741     result2 = strtod (input + 1, &ptr2);
 742 #if 1 /* All known CPUs support NaNs.  */
 743     ASSERT (isnand (result1));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 744     ASSERT (isnand (result2));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 745 # if 0
 746     /* Sign bits of NaN is a portability sticking point, not worth
 747        worrying about.  */
 748     ASSERT (!!signbit (result1) != !!signbit (result2)); /* glibc-2.3.6, IRIX 6.5, OSF/1 5.1, mingw */
 749 # endif
 750     ASSERT (ptr1 == input + 7);         /* glibc-2.3.6, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 751     ASSERT (ptr2 == input + 7);         /* glibc-2.3.6, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
 752     ASSERT (errno == 0);
 753 #else
 754     ASSERT (result1 == 0.0);
 755     ASSERT (result2 == 0.0);
 756     ASSERT (!signbit (result1));
 757     ASSERT (!signbit (result2));
 758     ASSERT (ptr1 == input);
 759     ASSERT (ptr2 == input + 1);
 760     ASSERT (errno == 0 || errno == EINVAL);
 761 #endif
 762   }
 763
 764   /* Hex.  */
 765   {
 766     const char input[] = "0xa";
 767     char *ptr;
 768     double result;
 769     errno = 0;
 770     result = strtod (input, &ptr);
 771     ASSERT (result == 10.0);            /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 772     ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 773     ASSERT (errno == 0);
 774   }
 775   {
 776     const char input[] = "0XA";
 777     char *ptr;
 778     double result;
 779     errno = 0;
 780     result = strtod (input, &ptr);
 781     ASSERT (result == 10.0);            /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 782     ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 783     ASSERT (errno == 0);
 784   }
 785   {
 786     const char input[] = "0x1p";
 787     char *ptr;
 788     double result;
 789     errno = 0;
 790     result = strtod (input, &ptr);
 791     ASSERT (result == 1.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 792     ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 793     ASSERT (errno == 0);
 794   }
 795   {
 796     const char input[] = "0x1p+";
 797     char *ptr;
 798     double result;
 799     errno = 0;
 800     result = strtod (input, &ptr);
 801     ASSERT (result == 1.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 802     ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 803     ASSERT (errno == 0);
 804   }
 805   {
 806     const char input[] = "0x1P+";
 807     char *ptr;
 808     double result;
 809     errno = 0;
 810     result = strtod (input, &ptr);
 811     ASSERT (result == 1.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 812     ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 813     ASSERT (errno == 0);
 814   }
 815   {
 816     const char input[] = "0x1p+1";
 817     char *ptr;
 818     double result;
 819     errno = 0;
 820     result = strtod (input, &ptr);
 821     ASSERT (result == 2.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 822     ASSERT (ptr == input + 6);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 823     ASSERT (errno == 0);
 824   }
 825   {
 826     const char input[] = "0X1P+1";
 827     char *ptr;
 828     double result;
 829     errno = 0;
 830     result = strtod (input, &ptr);
 831     ASSERT (result == 2.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 832     ASSERT (ptr == input + 6);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 833     ASSERT (errno == 0);
 834   }
 835   {
 836     const char input[] = "0x1p+1a";
 837     char *ptr;
 838     double result;
 839     errno = 0;
 840     result = strtod (input, &ptr);
 841     ASSERT (result == 2.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 842     ASSERT (ptr == input + 6);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 843     ASSERT (errno == 0);
 844   }
 845   {
 846     const char input[] = "0x1p 2";
 847     char *ptr;
 848     double result;
 849     errno = 0;
 850     result = strtod (input, &ptr);
 851     ASSERT (result == 1.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 852     ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 7.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
 853     ASSERT (errno == 0);
 854   }
 855
 856   /* Large buffers.  */
 857   {
 858     size_t m = 1000000;
 859     char *input = malloc (m + 1);
 860     if (input)
 861       {
 862         char *ptr;
 863         double result;
 864         memset (input, '\t', m - 1);
 865         input[m - 1] = '1';
 866         input[m] = '\0';
 867         errno = 0;
 868         result = strtod (input, &ptr);
 869         ASSERT (result == 1.0);
 870         ASSERT (ptr == input + m);
 871         ASSERT (errno == 0);
 872       }
 873     free (input);
 874   }
 875   {
 876     size_t m = 1000000;
 877     char *input = malloc (m + 1);
 878     if (input)
 879       {
 880         char *ptr;
 881         double result;
 882         memset (input, '0', m - 1);
 883         input[m - 1] = '1';
 884         input[m] = '\0';
 885         errno = 0;
 886         result = strtod (input, &ptr);
 887         ASSERT (result == 1.0);
 888         ASSERT (ptr == input + m);
 889         ASSERT (errno == 0);
 890       }
 891     free (input);
 892   }
 893 #if 0
 894   /* Newlib has an artificial limit of 20000 for the exponent.  TODO -
 895      gnulib should fix this.  */
 896   {
 897     size_t m = 1000000;
 898     char *input = malloc (m + 1);
 899     if (input)
 900       {
 901         char *ptr;
 902         double result;
 903         input[0] = '.';
 904         memset (input + 1, '0', m - 10);
 905         input[m - 9] = '1';
 906         input[m - 8] = 'e';
 907         input[m - 7] = '+';
 908         input[m - 6] = '9';
 909         input[m - 5] = '9';
 910         input[m - 4] = '9';
 911         input[m - 3] = '9';
 912         input[m - 2] = '9';
 913         input[m - 1] = '1';
 914         input[m] = '\0';
 915         errno = 0;
 916         result = strtod (input, &ptr);
 917         ASSERT (result == 1.0);         /* Mac OS X 10.3, FreeBSD 6.2, NetBSD 3.0, OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
 918         ASSERT (ptr == input + m);      /* OSF/1 5.1 */
 919         ASSERT (errno == 0);            /* Mac OS X 10.3, FreeBSD 6.2, NetBSD 3.0, OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
 920       }
 921     free (input);
 922   }
 923   {
 924     size_t m = 1000000;
 925     char *input = malloc (m + 1);
 926     if (input)
 927       {
 928         char *ptr;
 929         double result;
 930         input[0] = '1';
 931         memset (input + 1, '0', m - 9);
 932         input[m - 8] = 'e';
 933         input[m - 7] = '-';
 934         input[m - 6] = '9';
 935         input[m - 5] = '9';
 936         input[m - 4] = '9';
 937         input[m - 3] = '9';
 938         input[m - 2] = '9';
 939         input[m - 1] = '1';
 940         input[m] = '\0';
 941         errno = 0;
 942         result = strtod (input, &ptr);
 943         ASSERT (result == 1.0);         /* Mac OS X 10.3, FreeBSD 6.2, NetBSD 3.0, OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
 944         ASSERT (ptr == input + m);
 945         ASSERT (errno == 0);            /* Mac OS X 10.3, FreeBSD 6.2, NetBSD 3.0, OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
 946       }
 947     free (input);
 948   }
 949 #endif
 950   {
 951     size_t m = 1000000;
 952     char *input = malloc (m + 1);
 953     if (input)
 954       {
 955         char *ptr;
 956         double result;
 957         input[0] = '-';
 958         input[1] = '0';
 959         input[2] = 'e';
 960         input[3] = '1';
 961         memset (input + 4, '0', m - 3);
 962         input[m] = '\0';
 963         errno = 0;
 964         result = strtod (input, &ptr);
 965         ASSERT (result == 0.0);
 966         ASSERT (!!signbit (result) == !!signbit (minus_zerod)); /* IRIX 6.5, OSF/1 4.0 */
 967         ASSERT (ptr == input + m);
 968         ASSERT (errno == 0);
 969       }
 970     free (input);
 971   }
 972
 973   /* Rounding.  */
 974   /* TODO - is it worth some tests of rounding for typical IEEE corner
 975      cases, such as .5 ULP rounding up to the smallest denormal and
 976      not causing underflow, or DBL_MIN - .5 ULP not causing an
 977      infinite loop?  */
 978
 979   return status;
 980 }