1 files changed, 980 insertions, 0 deletions
diff --git a/gnulib-tests/test-strtold.c b/gnulib-tests/test-strtold.c
new file mode 100644
index 0000000..91f4591
--- /dev/null
+++ b/gnulib-tests/test-strtold.c
@@ -0,0 +1,980 @@
+/*
+ * Copyright (C) 2008-2022 Free Software Foundation, Inc.
+ * Written by Eric Blake
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <stdlib.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (strtold, long double, (char const *, char **));
+
+#include <errno.h>
+#include <float.h>
+#include <math.h>
+#include <string.h>
+
+#include "isnanl-nolibm.h"
+#include "minus-zero.h"
+#include "macros.h"
+
+/* Avoid requiring -lm just for fabsl.  */
+#define FABSL(d) ((d) < 0.0L ? -(d) : (d))
+
+int
+main (void)
+{
+  int status = 0;
+  /* Subject sequence empty or invalid.  */
+  {
+    const char input[] = "";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input);
+    ASSERT (errno == 0 || errno == EINVAL);
+  }
+  {
+    const char input[] = " ";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input);
+    ASSERT (errno == 0 || errno == EINVAL);
+  }
+  {
+    const char input[] = " +";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input);
+    ASSERT (errno == 0 || errno == EINVAL);
+  }
+  {
+    const char input[] = " .";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input);
+    ASSERT (errno == 0 || errno == EINVAL);
+  }
+  {
+    const char input[] = " .e0";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input);              /* IRIX 6.5 */
+    ASSERT (errno == 0 || errno == EINVAL);
+  }
+  {
+    const char input[] = " +.e-0";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input);              /* IRIX 6.5 */
+    ASSERT (errno == 0 || errno == EINVAL);
+  }
+  {
+    const char input[] = " in";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input);
+    ASSERT (errno == 0 || errno == EINVAL);
+  }
+  {
+    const char input[] = " na";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input);
+    ASSERT (errno == 0 || errno == EINVAL);
+  }
+
+  /* Simple floating point values.  */
+  {
+    const char input[] = "1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 1);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1.";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 2);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = ".5";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.5L);
+    ASSERT (ptr == input + 2);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = " 1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 2);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "+1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 2);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "-1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == -1.0L);
+    ASSERT (ptr == input + 2);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1e0";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 3);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1e+0";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 4);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1e-0";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 4);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1e1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 10.0L);
+    ASSERT (ptr == input + 3);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "5e-1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.5L);
+    ASSERT (ptr == input + 4);
+    ASSERT (errno == 0);
+  }
+
+  /* Zero.  */
+  {
+    const char input[] = "0";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 1);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = ".0";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 2);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0e0";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 3);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0e+9999999";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 10);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0e-9999999";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 10);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "-0";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!!signbit (result) == !!signbit (minus_zerol)); /* IRIX 6.5 */
+    ASSERT (ptr == input + 2);
+    ASSERT (errno == 0);
+  }
+
+  /* Suffixes.  */
+  {
+    const char input[] = "1f";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 1);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1.f";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 2);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1e";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 1);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1e+";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 1);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1e-";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 1);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1E 2";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);            /* HP-UX 11.31/ia64, IRIX 6.5 */
+    ASSERT (ptr == input + 1);          /* HP-UX 11.31/ia64, IRIX 6.5 */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0x";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 1);          /* glibc-2.3.2, Mac OS X 10.5, Haiku */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "00x1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 2);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "-0x";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!!signbit (result) == !!signbit (minus_zerol)); /* Mac OS X 10.5, IRIX 6.5 */
+    ASSERT (ptr == input + 2);          /* glibc-2.3.2, Mac OS X 10.5, Haiku */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0xg";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 1);          /* glibc-2.3.2, Mac OS X 10.5, Haiku */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0xp";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 1);          /* glibc-2.3.2, Mac OS X 10.5, Haiku */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0XP";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 1);          /* glibc-2.3.2, Mac OS X 10.5, Haiku */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0x.";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 1);          /* glibc-2.3.2, Mac OS X 10.5, Haiku */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0xp+";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 1);          /* glibc-2.3.2, Mac OS X 10.5, Haiku */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0xp+1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 1);          /* glibc-2.3.2, Mac OS X 10.5, Haiku */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0x.p+1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 1);          /* glibc-2.3.2, Mac OS X 10.5, Haiku */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1p+1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 1);
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "1P+1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);
+    ASSERT (ptr == input + 1);
+    ASSERT (errno == 0);
+  }
+
+  /* Overflow/underflow.  */
+  {
+    const char input[] = "1E1000000";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == HUGE_VALL);
+    ASSERT (ptr == input + 9);
+    ASSERT (errno == ERANGE);
+  }
+  {
+    const char input[] = "-1E1000000";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == -HUGE_VALL);
+    ASSERT (ptr == input + 10);
+    ASSERT (errno == ERANGE);
+  }
+  {
+    const char input[] = "1E-100000";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (0.0L <= result && result <= LDBL_MIN);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input + 9);
+    ASSERT (errno == ERANGE);
+  }
+  {
+    const char input[] = "-1E-100000";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (-LDBL_MIN <= result && result <= 0.0L);
+#if 0
+    /* FIXME - this is glibc bug 5995; POSIX allows returning positive
+       0 on negative underflow, even though quality of implementation
+       demands preserving the sign.  Disable this test until fixed
+       glibc is more prevalent.  */
+    ASSERT (!!signbit (result) == !!signbit (minus_zerol)); /* glibc-2.3.2, Haiku */
+#endif
+    ASSERT (ptr == input + 10);
+    ASSERT (errno == ERANGE);
+  }
+  {
+    const char input[] = "1E 1000000";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);            /* HP-UX 11.31/ia64, IRIX 6.5 */
+    ASSERT (ptr == input + 1);          /* HP-UX 11.31/ia64, IRIX 6.5 */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64, IRIX 6.5 */
+  }
+  {
+    const char input[] = "0x1P 1000000";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);            /* HP-UX 11.31/ia64, IRIX 6.5, mingw */
+    ASSERT (ptr == input + 3);          /* HP-UX 11.31/ia64, IRIX 6.5, mingw */
+    ASSERT (errno == 0);
+  }
+
+  /* Infinity.  */
+  {
+    const char input[] = "iNf";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == HUGE_VALL);       /* IRIX 6.5 */
+    ASSERT (ptr == input + 3);          /* IRIX 6.5 */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64 */
+  }
+  {
+    const char input[] = "-InF";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == -HUGE_VALL);      /* IRIX 6.5 */
+    ASSERT (ptr == input + 4);          /* IRIX 6.5 */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64 */
+  }
+  {
+    const char input[] = "infinite";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == HUGE_VALL);       /* IRIX 6.5 */
+    ASSERT (ptr == input + 3);          /* IRIX 6.5 */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64 */
+  }
+  {
+    const char input[] = "infinitY";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == HUGE_VALL);       /* IRIX 6.5 */
+    ASSERT (ptr == input + 8);          /* IRIX 6.5 */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64 */
+  }
+  {
+    const char input[] = "infinitY.";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == HUGE_VALL);       /* IRIX 6.5 */
+    ASSERT (ptr == input + 8);          /* IRIX 6.5 */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64 */
+  }
+
+  /* NaN.  Some processors set the sign bit of the default NaN, so all
+     we check is that using a sign changes the result.  */
+  {
+    const char input[] = "-nan";
+    char *ptr1;
+    char *ptr2;
+    long double result1;
+    long double result2;
+    errno = 0;
+    result1 = strtold (input, &ptr1);
+    result2 = strtold (input + 1, &ptr2);
+#if 1 /* All known CPUs support NaNs.  */
+    ASSERT (isnanl (result1));          /* IRIX 6.5 */
+    ASSERT (isnanl (result2));          /* IRIX 6.5 */
+# if 0
+    /* Sign bits of NaN is a portability sticking point, not worth
+       worrying about.  */
+    ASSERT (!!signbit (result1) != !!signbit (result2));
+# endif
+    ASSERT (ptr1 == input + 4);         /* IRIX 6.5 */
+    ASSERT (ptr2 == input + 4);         /* IRIX 6.5 */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64 */
+#else
+    ASSERT (result1 == 0.0L);
+    ASSERT (result2 == 0.0L);
+    ASSERT (!signbit (result1));
+    ASSERT (!signbit (result2));
+    ASSERT (ptr1 == input);
+    ASSERT (ptr2 == input + 1);
+    ASSERT (errno == 0 || errno == EINVAL);
+#endif
+  }
+  {
+    const char input[] = "+nan(";
+    char *ptr1;
+    char *ptr2;
+    long double result1;
+    long double result2;
+    errno = 0;
+    result1 = strtold (input, &ptr1);
+    result2 = strtold (input + 1, &ptr2);
+#if 1 /* All known CPUs support NaNs.  */
+    ASSERT (isnanl (result1));          /* IRIX 6.5 */
+    ASSERT (isnanl (result2));          /* IRIX 6.5 */
+    ASSERT (!!signbit (result1) == !!signbit (result2));
+    ASSERT (ptr1 == input + 4);         /* Mac OS X 10.5, IRIX 6.5 */
+    ASSERT (ptr2 == input + 4);         /* Mac OS X 10.5, IRIX 6.5 */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64 */
+#else
+    ASSERT (result1 == 0.0L);
+    ASSERT (result2 == 0.0L);
+    ASSERT (!signbit (result1));
+    ASSERT (!signbit (result2));
+    ASSERT (ptr1 == input);
+    ASSERT (ptr2 == input + 1);
+    ASSERT (errno == 0 || errno == EINVAL);
+#endif
+  }
+  {
+    const char input[] = "-nan()";
+    char *ptr1;
+    char *ptr2;
+    long double result1;
+    long double result2;
+    errno = 0;
+    result1 = strtold (input, &ptr1);
+    result2 = strtold (input + 1, &ptr2);
+#if 1 /* All known CPUs support NaNs.  */
+    ASSERT (isnanl (result1));          /* IRIX 6.5 */
+    ASSERT (isnanl (result2));          /* IRIX 6.5 */
+# if 0
+    /* Sign bits of NaN is a portability sticking point, not worth
+       worrying about.  */
+    ASSERT (!!signbit (result1) != !!signbit (result2)); /* glibc-2.3.2, musl libc, OpenBSD 6.0, IRIX 6.5, mingw, Haiku */
+# endif
+    ASSERT (ptr1 == input + 6);         /* glibc-2.3.2, IRIX 6.5, mingw, Haiku */
+    ASSERT (ptr2 == input + 6);         /* glibc-2.3.2, IRIX 6.5, mingw, Haiku */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64, Haiku */
+#else
+    ASSERT (result1 == 0.0L);
+    ASSERT (result2 == 0.0L);
+    ASSERT (!signbit (result1));
+    ASSERT (!signbit (result2));
+    ASSERT (ptr1 == input);
+    ASSERT (ptr2 == input + 1);
+    ASSERT (errno == 0 || errno == EINVAL);
+#endif
+  }
+  {
+    const char input[] = " nan().";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+#if 1 /* All known CPUs support NaNs.  */
+    ASSERT (isnanl (result));           /* IRIX 6.5 */
+    ASSERT (ptr == input + 6);          /* glibc-2.3.2, IRIX 6.5, mingw, Haiku */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64, Haiku */
+#else
+    ASSERT (result == 0.0L);
+    ASSERT (!signbit (result));
+    ASSERT (ptr == input);
+    ASSERT (errno == 0 || errno == EINVAL);
+#endif
+  }
+  {
+    /* The behavior of nan(0) is implementation-defined, but all
+       implementations we know of which handle optional
+       n-char-sequences handle nan(0) the same as nan().  */
+    const char input[] = "-nan(0).";
+    char *ptr1;
+    char *ptr2;
+    long double result1;
+    long double result2;
+    errno = 0;
+    result1 = strtold (input, &ptr1);
+    result2 = strtold (input + 1, &ptr2);
+#if 1 /* All known CPUs support NaNs.  */
+    ASSERT (isnanl (result1));          /* IRIX 6.5 */
+    ASSERT (isnanl (result2));          /* IRIX 6.5 */
+# if 0
+    /* Sign bits of NaN is a portability sticking point, not worth
+       worrying about.  */
+    ASSERT (!!signbit (result1) != !!signbit (result2));
+# endif
+    ASSERT (ptr1 == input + 7);         /* glibc-2.3.2, IRIX 6.5, mingw, Haiku */
+    ASSERT (ptr2 == input + 7);         /* glibc-2.3.2, IRIX 6.5, mingw, Haiku */
+    ASSERT (errno == 0);                /* HP-UX 11.31/ia64 */
+#else
+    ASSERT (result1 == 0.0L);
+    ASSERT (result2 == 0.0L);
+    ASSERT (!signbit (result1));
+    ASSERT (!signbit (result2));
+    ASSERT (ptr1 == input);
+    ASSERT (ptr2 == input + 1);
+    ASSERT (errno == 0 || errno == EINVAL);
+#endif
+  }
+
+  /* Hex.  */
+  {
+    const char input[] = "0xa";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 10.0L);           /* IRIX 6.5, mingw */
+    ASSERT (ptr == input + 3);          /* IRIX 6.5, mingw */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0XA";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 10.0L);           /* IRIX 6.5, mingw */
+    ASSERT (ptr == input + 3);          /* IRIX 6.5, mingw */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0x1p";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);            /* IRIX 6.5, mingw */
+    ASSERT (ptr == input + 3);          /* IRIX 6.5, mingw */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0x1p+";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);            /* IRIX 6.5, mingw */
+    ASSERT (ptr == input + 3);          /* IRIX 6.5, mingw */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0x1P+";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);            /* IRIX 6.5, mingw */
+    ASSERT (ptr == input + 3);          /* IRIX 6.5, mingw */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0x1p+1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 2.0L);            /* IRIX 6.5, mingw */
+    ASSERT (ptr == input + 6);          /* IRIX 6.5, mingw */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0X1P+1";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 2.0L);            /* IRIX 6.5, mingw */
+    ASSERT (ptr == input + 6);          /* IRIX 6.5, mingw */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0x1p+1a";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 2.0L);            /* IRIX 6.5, mingw */
+    ASSERT (ptr == input + 6);          /* IRIX 6.5, mingw */
+    ASSERT (errno == 0);
+  }
+  {
+    const char input[] = "0x1p 2";
+    char *ptr;
+    long double result;
+    errno = 0;
+    result = strtold (input, &ptr);
+    ASSERT (result == 1.0L);            /* HP-UX 11.31/ia64, IRIX 6.5, mingw */
+    ASSERT (ptr == input + 3);          /* HP-UX 11.31/ia64, IRIX 6.5, mingw */
+    ASSERT (errno == 0);
+  }
+
+  /* Large buffers.  */
+  {
+    size_t m = 1000000;
+    char *input = malloc (m + 1);
+    if (input)
+      {
+        char *ptr;
+        long double result;
+        memset (input, '\t', m - 1);
+        input[m - 1] = '1';
+        input[m] = '\0';
+        errno = 0;
+        result = strtold (input, &ptr);
+        ASSERT (result == 1.0L);
+        ASSERT (ptr == input + m);
+        ASSERT (errno == 0);
+      }
+    free (input);
+  }
+  {
+    size_t m = 1000000;
+    char *input = malloc (m + 1);
+    if (input)
+      {
+        char *ptr;
+        long double result;
+        memset (input, '0', m - 1);
+        input[m - 1] = '1';
+        input[m] = '\0';
+        errno = 0;
+        result = strtold (input, &ptr);
+        ASSERT (result == 1.0L);
+        ASSERT (ptr == input + m);
+        ASSERT (errno == 0);
+      }
+    free (input);
+  }
+#if 0
+  /* Newlib has an artificial limit of 20000 for the exponent.  TODO -
+     gnulib should fix this.  */
+  {
+    size_t m = 1000000;
+    char *input = malloc (m + 1);
+    if (input)
+      {
+        char *ptr;
+        long double result;
+        input[0] = '.';
+        memset (input + 1, '0', m - 10);
+        input[m - 9] = '1';
+        input[m - 8] = 'e';
+        input[m - 7] = '+';
+        input[m - 6] = '9';
+        input[m - 5] = '9';
+        input[m - 4] = '9';
+        input[m - 3] = '9';
+        input[m - 2] = '9';
+        input[m - 1] = '1';
+        input[m] = '\0';
+        errno = 0;
+        result = strtold (input, &ptr);
+        ASSERT (result == 1.0L);        /* Mac OS X 10.5, FreeBSD 11.0, NetBSD 7.1, OpenBSD 6.0, Minix 3.3, IRIX 6.5, mingw */
+        ASSERT (ptr == input + m);
+        ASSERT (errno == 0);            /* Mac OS X 10.5, FreeBSD 11.0, NetBSD 7.1, OpenBSD 6.0, Minix 3.3, IRIX 6.5, mingw */
+      }
+    free (input);
+  }
+  {
+    size_t m = 1000000;
+    char *input = malloc (m + 1);
+    if (input)
+      {
+        char *ptr;
+        long double result;
+        input[0] = '1';
+        memset (input + 1, '0', m - 9);
+        input[m - 8] = 'e';
+        input[m - 7] = '-';
+        input[m - 6] = '9';
+        input[m - 5] = '9';
+        input[m - 4] = '9';
+        input[m - 3] = '9';
+        input[m - 2] = '9';
+        input[m - 1] = '1';
+        input[m] = '\0';
+        errno = 0;
+        result = strtold (input, &ptr);
+        ASSERT (result == 1.0L);        /* Mac OS X 10.5, FreeBSD 11.0, NetBSD 7.1, OpenBSD 6.0, Minix 3.3, IRIX 6.5, mingw */
+        ASSERT (ptr == input + m);
+        ASSERT (errno == 0);            /* Mac OS X 10.5, FreeBSD 11.0, NetBSD 7.1, OpenBSD 6.0, Minix 3.3, IRIX 6.5, mingw */
+      }
+    free (input);
+  }
+#endif
+  {
+    size_t m = 1000000;
+    char *input = malloc (m + 1);
+    if (input)
+      {
+        char *ptr;
+        long double result;
+        input[0] = '-';
+        input[1] = '0';
+        input[2] = 'e';
+        input[3] = '1';
+        memset (input + 4, '0', m - 3);
+        input[m] = '\0';
+        errno = 0;
+        result = strtold (input, &ptr);
+        ASSERT (result == 0.0L);
+        ASSERT (!!signbit (result) == !!signbit (minus_zerol)); /* IRIX 6.5 */
+        ASSERT (ptr == input + m);
+        ASSERT (errno == 0);
+      }
+    free (input);
+  }
+
+  /* Rounding.  */
+  /* TODO - is it worth some tests of rounding for typical IEEE corner
+     cases, such as .5 ULP rounding up to the smallest denormal and
+     not causing underflow, or LDBL_MIN - .5 ULP not causing an
+     infinite loop?  */
+
+  return status;
+}