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trailing empty strings
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Add function set_make_nulstr() to create a nulstr out of a set. Behave
the same way as strv_make_nulstr().
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Let's change the return semantics of strv_make_nulstr() so that we can
properly distuingish the case where we have a no entries in the nulstr
from the case where we have a single empty string in a nulstr.
Previously we couldn't distuingish those, we'd in both cases return a
size of zero, and a buffer with two NUL bytes.
With this change, we'll still return a buffer with two NULL bytes, but
for the case where no entries are defined we'll return a size of zero,
and where we have two a size of one.
This is a good idea, as it makes sure we can properly handle all corner
cases.
Nowadays the function is used by one place only: ask-password-api.c. The
corner case never mattered there, since it was used to serialize
passwords, and it was known that there was exactly one password, not
less. But let's clean this up. This means the subtraction of the final
NUL byte now happens in ask-password-api.c instead.
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if the nulstr is not nul-terminated, we shouldn't use strndup() but
memdup_suffix0(), to not trip up static analyzers which imply we are
duping a string here.
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Let's move them out of the generic, already very long strv.[ch] module
into the more specific nulst-util.[ch]
No code changes.
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Currently `nulstr_contains` returns a boolean, making it difficult to
identify which of the input strings matches the "needle".
Adding a new `nulstr_get()` function, returning a const pointer to the
matching string, eases this process and allows us to directly re-use the
result of a call to this function without additional processing or
memory allocation.
Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
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