tdestroy(3): add tests

Reviewed by: alc, emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D54365

strfmon: Fix negative sign handling for C locale

If the locale's positive_sign and negative_sign values would both be
returned by localeconv() as empty strings, strfmon() shall behave as if
the nega

strfmon: Fix negative sign handling for C locale

If the locale's positive_sign and negative_sign values would both be
returned by localeconv() as empty strings, strfmon() shall behave as if
the negative_sign value was the string "-".

This occurs with the C locale. The implementation previously assigned
"0" to sign_posn (parentheses around the entire string); now it assigns
it to "1" (sign before the string) when it is undefined (CHAR_MAX).

Austin Group Defect 1199[1] is applied, changing the requirements for
the '+' and '(' flags.

[1]: https://www.austingroupbugs.net/view.php?id=1199

Reviewed by: kib
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D53913

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strfmon: EINVAL if the '+' flag and both signs are empty

According to the Open Group Base Specifications Issue 8[1], strfmon(3)
should return EINVAL when the '+' flag was included in a conversion
sp

strfmon: EINVAL if the '+' flag and both signs are empty

According to the Open Group Base Specifications Issue 8[1], strfmon(3)
should return EINVAL when the '+' flag was included in a conversion
specification and the locale's positive_sign and negative_sign values
would both be returned by localeconv(3) as empty strings.

Austin Group Defect 1199[2] is applied, adding the [EINVAL] error.

[1]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/strfmon.html
[2]: https://www.austingroupbugs.net/view.php?id=1199

Reviewed by: kib
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D53912

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strfmon: Add tests for Austin Group Defect 1199

Add tests for The Open Group Base Specifications Issue 8[1], Austin
Group Defect 1199[2].

Items marked with XXX represent an invalid output. These i

strfmon: Add tests for Austin Group Defect 1199

Add tests for The Open Group Base Specifications Issue 8[1], Austin
Group Defect 1199[2].

Items marked with XXX represent an invalid output. These items will be
fixed in subsequent commits.

Notice that an existing test is now considered invalid.

Our locale definitions do not include int_p_sep_by_space nor
int_n_sep_by_space[3]. Those will be addressed in a subsequent commit.
However, the CLDR project defines them as "0", which causes the output
to appear as "USD123.45". If our locale definitions were to set the
international {n,p}_sep_by_space to "1", the output would display as the
expected "USD 123.45".

While here, use the SPDX license identifier and add my name to the
file.

[1]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/strfmon.html
[2]: https://www.austingroupbugs.net/view.php?id=1199
[3]: https://unicode-org.atlassian.net/browse/CLDR-237

Reviewed by: kib
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D53911

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