printf: Add smoke tests for long double

  The printf tests have no coverage for long double.  Duplicate the
double tests so that we have some basic coverage.
---
 stdio-common/tst-printf.c  | 65 +++++++++++++++++++++++++++++++------
 stdio-common/tst-printf.sh | 66 +++++++++++++++++++++++++++-----------
 2 files changed, 103 insertions(+), 28 deletions(-)
  

On 2/4/21 10:57 PM, Siddhesh Poyarekar via Libc-alpha wrote:
> The printf tests have no coverage for long double.  Duplicate the
> double tests so that we have some basic coverage.

OK for master.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

> ---
>  stdio-common/tst-printf.c  | 65 +++++++++++++++++++++++++++++++------
>  stdio-common/tst-printf.sh | 66 +++++++++++++++++++++++++++-----------
>  2 files changed, 103 insertions(+), 28 deletions(-)
> 
> diff --git a/stdio-common/tst-printf.c b/stdio-common/tst-printf.c
> index 2c4624cd42..b4241330cb 100644
> --- a/stdio-common/tst-printf.c
> +++ b/stdio-common/tst-printf.c
> @@ -127,21 +127,39 @@ I am ready for my first lesson today.";
>    printf("e-style < .1:\t\"%e\"\n", 0.001234);
>    printf("e-style big:\t\"%.60e\"\n", 1e20);
>    printf ("e-style == .1:\t\"%e\"\n", 0.1);
> +  printf("f-style == 0:\t\"%f\"\n", 0.0);

OK. Zero.

>    printf("f-style >= 1:\t\"%f\"\n", 12.34);
>    printf("f-style >= .1:\t\"%f\"\n", 0.1234);
>    printf("f-style < .1:\t\"%f\"\n", 0.001234);
> +  printf("g-style == 0:\t\"%g\"\n", 0.0);

OK. Zero.

>    printf("g-style >= 1:\t\"%g\"\n", 12.34);
>    printf("g-style >= .1:\t\"%g\"\n", 0.1234);
>    printf("g-style < .1:\t\"%g\"\n", 0.001234);
>    printf("g-style big:\t\"%.60g\"\n", 1e20);
>  
> +  printf("Lf-style == 0:\t\"%Lf\"\n", (long double) 0.0);

OK. Zero.

> +  printf("Lf-style >= 1:\t\"%Lf\"\n", (long double) 12.34);
> +  printf("Lf-style >= .1:\t\"%Lf\"\n", (long double) 0.1234);
> +  printf("Lf-style < .1:\t\"%Lf\"\n", (long double) 0.001234);
> +  printf("Lg-style == 0:\t\"%Lg\"\n", (long double) 0.0);
> +  printf("Lg-style >= 1:\t\"%Lg\"\n", (long double) 12.34);
> +  printf("Lg-style >= .1:\t\"%Lg\"\n", (long double) 0.1234);
> +  printf("Lg-style < .1:\t\"%Lg\"\n", (long double) 0.001234);
> +  printf("Lg-style big:\t\"%.60Lg\"\n", (long double) 1e20);

OK. Some non-zero, some leading zero.

> +
>    printf (" %6.5f\n", .099999999860301614);
>    printf (" %6.5f\n", .1);
>    printf ("x%5.4fx\n", .5);
>  
> +  printf (" %6.5Lf\n", (long double) .099999999860301614);
> +  printf (" %6.5Lf\n", (long double) .1);
> +  printf ("x%5.4Lfx\n", (long double) .5);

OK.

> +
>    printf ("%#03x\n", 1);
>  
>    printf ("something really insane: %.10000f\n", 1.0);
> +  printf ("something really insane (long double): %.10000Lf\n",
> +	  (long double) 1.0);

OK.

>  
>    {
>      double d = FLT_MIN;
> @@ -154,16 +172,25 @@ I am ready for my first lesson today.";
>  
>    printf ("%15.5e\n", 4.9406564584124654e-324);
>  
> -#define FORMAT "|%12.4f|%12.4e|%12.4g|\n"
> -  printf (FORMAT, 0.0, 0.0, 0.0);
> -  printf (FORMAT, 1.0, 1.0, 1.0);
> -  printf (FORMAT, -1.0, -1.0, -1.0);
> -  printf (FORMAT, 100.0, 100.0, 100.0);
> -  printf (FORMAT, 1000.0, 1000.0, 1000.0);
> -  printf (FORMAT, 10000.0, 10000.0, 10000.0);
> -  printf (FORMAT, 12345.0, 12345.0, 12345.0);
> -  printf (FORMAT, 100000.0, 100000.0, 100000.0);
> -  printf (FORMAT, 123456.0, 123456.0, 123456.0);
> +#define FORMAT "|%12.4f|%12.4e|%12.4g|%12.4Lf|%12.4Lg|\n"

OK. Expands to Lf and Lg.

> +  printf (FORMAT, 0.0, 0.0, 0.0,
> +	  (long double) 0.0, (long double) 0.0);
> +  printf (FORMAT, 1.0, 1.0, 1.0,
> +	  (long double) 1.0, (long double) 1.0);
> +  printf (FORMAT, -1.0, -1.0, -1.0,
> +	  (long double) -1.0, (long double) -1.0);
> +  printf (FORMAT, 100.0, 100.0, 100.0,
> +	  (long double) 100.0, (long double) 100.0);
> +  printf (FORMAT, 1000.0, 1000.0, 1000.0,
> +	  (long double) 1000.0, (long double) 1000.0);
> +  printf (FORMAT, 10000.0, 10000.0, 10000.0,
> +	  (long double) 10000.0, (long double) 10000.0);
> +  printf (FORMAT, 12345.0, 12345.0, 12345.0,
> +	  (long double) 12345.0, (long double) 12345.0);
> +  printf (FORMAT, 100000.0, 100000.0, 100000.0,
> +	  (long double) 100000.0, (long double) 100000.0);
> +  printf (FORMAT, 123456.0, 123456.0, 123456.0,
> +	  (long double) 123456.0, (long double) 123456.0);

OK.

>  #undef	FORMAT
>  
>    {
> @@ -269,6 +296,9 @@ rfg1 (void)
>    if (strcmp (buf, "     ") != 0)
>      printf ("got: '%s', expected: '%s'\n", buf, "     ");
>    sprintf (buf, "%5.f", 33.3);
> +  if (strcmp (buf, "   33") != 0)
> +    printf ("got: '%s', expected: '%s'\n", buf, "   33");
> +  sprintf (buf, "%5.Lf", (long double) 33.3);

OK. Add Lf.

>    if (strcmp (buf, "   33") != 0)
>      printf ("got: '%s', expected: '%s'\n", buf, "   33");
>    sprintf (buf, "%8.e", 33.3e7);
> @@ -278,6 +308,9 @@ rfg1 (void)
>    if (strcmp (buf, "   3E+08") != 0)
>      printf ("got: '%s', expected: '%s'\n", buf, "   3E+08");
>    sprintf (buf, "%.g", 33.3);
> +  if (strcmp (buf, "3e+01") != 0)
> +    printf ("got: '%s', expected: '%s'\n", buf, "3e+01");
> +  sprintf (buf, "%.Lg", (long double) 33.3);

OK. Add Lg.

>    if (strcmp (buf, "3e+01") != 0)
>      printf ("got: '%s', expected: '%s'\n", buf, "3e+01");
>    sprintf (buf, "%.G", 33.3);
> @@ -301,6 +334,18 @@ rfg2 (void)
>      printf ("got: '%s', expected: '%s'\n", buf, "3");
>    prec = 0;
>    sprintf (buf, "%7.*G", prec, 3.33);
> +  if (strcmp (buf, "      3") != 0)
> +    printf ("got: '%s', expected: '%s'\n", buf, "      3");
> +  prec = 0;
> +  sprintf (buf, "%.*Lg", prec, (long double) 3.3);
> +  if (strcmp (buf, "3") != 0)
> +    printf ("got: '%s', expected: '%s'\n", buf, "3");
> +  prec = 0;
> +  sprintf (buf, "%.*LG", prec, (long double) 3.3);
> +  if (strcmp (buf, "3") != 0)
> +    printf ("got: '%s', expected: '%s'\n", buf, "3");
> +  prec = 0;
> +  sprintf (buf, "%7.*LG", prec, (long double) 3.33);

OK. Lg. LG. LG.

>    if (strcmp (buf, "      3") != 0)
>      printf ("got: '%s', expected: '%s'\n", buf, "      3");
>    prec = 3;
> diff --git a/stdio-common/tst-printf.sh b/stdio-common/tst-printf.sh
> index e421aabc66..c2aee1f1f3 100644
> --- a/stdio-common/tst-printf.sh
> +++ b/stdio-common/tst-printf.sh
> @@ -64,18 +64,33 @@ e-style >= .1:	"1.234000e-01"
>  e-style < .1:	"1.234000e-03"
>  e-style big:	"1.000000000000000000000000000000000000000000000000000000000000e+20"
>  e-style == .1:	"1.000000e-01"
> +f-style == 0:	"0.000000"

OK.

>  f-style >= 1:	"12.340000"
>  f-style >= .1:	"0.123400"
>  f-style < .1:	"0.001234"
> +g-style == 0:	"0"

OK.

>  g-style >= 1:	"12.34"
>  g-style >= .1:	"0.1234"
>  g-style < .1:	"0.001234"
>  g-style big:	"100000000000000000000"
> +Lf-style == 0:	"0.000000"
> +Lf-style >= 1:	"12.340000"
> +Lf-style >= .1:	"0.123400"
> +Lf-style < .1:	"0.001234"
> +Lg-style == 0:	"0"
> +Lg-style >= 1:	"12.34"
> +Lg-style >= .1:	"0.1234"
> +Lg-style < .1:	"0.001234"
> +Lg-style big:	"100000000000000000000"

OK. Lf. Lg.

> + 0.10000
> + 0.10000
> +x0.5000x
>   0.10000
>   0.10000
>  x0.5000x
>  0x1
>  something really insane: 1.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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00
> +something really insane (long double): 1.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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00
>  5.87747175411143754e-39
>  5.87747175411143754e-39
>  5.87747175411143754e-39
> @@ -94,15 +109,15 @@ something really insane: 1.00000000000000000000000000000000000000000000000000000
>  5.87747175411143754e-39
>  5.87747175411143754e-39
>     4.94066e-324
> -|      0.0000|  0.0000e+00|           0|
> -|      1.0000|  1.0000e+00|           1|
> -|     -1.0000| -1.0000e+00|          -1|
> -|    100.0000|  1.0000e+02|         100|
> -|   1000.0000|  1.0000e+03|        1000|
> -|  10000.0000|  1.0000e+04|       1e+04|
> -|  12345.0000|  1.2345e+04|   1.234e+04|
> -| 100000.0000|  1.0000e+05|       1e+05|
> -| 123456.0000|  1.2346e+05|   1.235e+05|
> +|      0.0000|  0.0000e+00|           0|      0.0000|           0|
> +|      1.0000|  1.0000e+00|           1|      1.0000|           1|
> +|     -1.0000| -1.0000e+00|          -1|     -1.0000|          -1|
> +|    100.0000|  1.0000e+02|         100|    100.0000|         100|
> +|   1000.0000|  1.0000e+03|        1000|   1000.0000|        1000|
> +|  10000.0000|  1.0000e+04|       1e+04|  10000.0000|       1e+04|
> +|  12345.0000|  1.2345e+04|   1.234e+04|  12345.0000|   1.234e+04|
> +| 100000.0000|  1.0000e+05|       1e+05| 100000.0000|       1e+05|
> +| 123456.0000|  1.2346e+05|   1.235e+05| 123456.0000|   1.235e+05|

OK. With additional results.

>  snprintf ("%30s", "foo") == 30, "                   "
>  snprintf ("%.999999u", 10) == 999999
>  179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.00000000
> @@ -163,18 +178,33 @@ e-style >= .1:	"1.234000e-01"
>  e-style < .1:	"1.234000e-03"
>  e-style big:	"1.000000000000000000000000000000000000000000000000000000000000e+20"
>  e-style == .1:	"1.000000e-01"
> +f-style == 0:	"0.000000"
>  f-style >= 1:	"12.340000"
>  f-style >= .1:	"0.123400"
>  f-style < .1:	"0.001234"
> +g-style == 0:	"0"
>  g-style >= 1:	"12.34"
>  g-style >= .1:	"0.1234"
>  g-style < .1:	"0.001234"
>  g-style big:	"100000000000000000000"
> +Lf-style == 0:	"0.000000"
> +Lf-style >= 1:	"12.340000"
> +Lf-style >= .1:	"0.123400"
> +Lf-style < .1:	"0.001234"
> +Lg-style == 0:	"0"
> +Lg-style >= 1:	"12.34"
> +Lg-style >= .1:	"0.1234"
> +Lg-style < .1:	"0.001234"
> +Lg-style big:	"100000000000000000000"
> + 0.10000
> + 0.10000
> +x0.5000x
>   0.10000
>   0.10000
>  x0.5000x
>  0x1
>  something really insane: 1.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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00
> +something really insane (long double): 1.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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00
>  5.87747175411143754e-39
>  5.87747175411143754e-39
>  5.87747175411143754e-39
> @@ -193,15 +223,15 @@ something really insane: 1.00000000000000000000000000000000000000000000000000000
>  5.87747175411143754e-39
>  5.87747175411143754e-39
>     4.94066e-324
> -|      0.0000|  0.0000e+00|           0|
> -|      1.0000|  1.0000e+00|           1|
> -|     -1.0000| -1.0000e+00|          -1|
> -|    100.0000|  1.0000e+02|         100|
> -|   1000.0000|  1.0000e+03|        1000|
> -|  10000.0000|  1.0000e+04|       1e+04|
> -|  12345.0000|  1.2345e+04|   1.234e+04|
> -| 100000.0000|  1.0000e+05|       1e+05|
> -| 123456.0000|  1.2346e+05|   1.235e+05|
> +|      0.0000|  0.0000e+00|           0|      0.0000|           0|
> +|      1.0000|  1.0000e+00|           1|      1.0000|           1|
> +|     -1.0000| -1.0000e+00|          -1|     -1.0000|          -1|
> +|    100.0000|  1.0000e+02|         100|    100.0000|         100|
> +|   1000.0000|  1.0000e+03|        1000|   1000.0000|        1000|
> +|  10000.0000|  1.0000e+04|       1e+04|  10000.0000|       1e+04|
> +|  12345.0000|  1.2345e+04|   1.234e+04|  12345.0000|   1.234e+04|
> +| 100000.0000|  1.0000e+05|       1e+05| 100000.0000|       1e+05|
> +| 123456.0000|  1.2346e+05|   1.235e+05| 123456.0000|   1.235e+05|

OK. With additional results.

>  snprintf ("%30s", "foo") == 30, "                   "
>  snprintf ("%.999999u", 10) == 999999
>  179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.00000000
>