CVS commit: [netbsd-9] src

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Sat Aug 24 16:15:40 UTC 2024

Modified Files:
        src/lib/libc/time [netbsd-9]: strptime.c
        src/tests/lib/libc/time [netbsd-9]: t_strptime.c

Log Message:
Pull up following revision(s) (requested by riastradh in ticket #1881):

        lib/libc/time/strptime.c: revision 1.64 (patch)
        lib/libc/time/strptime.c: revision 1.65 (patch)
        lib/libc/time/strptime.c: revision 1.66 (patch)
        tests/lib/libc/time/t_strptime.c: revision 1.16 (patch)

strptime(3): Exercise some edge cases in the automatic tests.

Unfortunately, we can't quite use strptime as a black box to detect
the cases that triggered undefined behaviour, because strptime just
fails in that case anyway since the number that would go in .tm_year
is far out of the representable range.
PR lib/58041

strptime(3): Avoid arithmetic overflow.
PR lib/58041

strptime(3): Reduce unnecessary indentation.
Post-fix tidying.
No functional change intended.
PR lib/58041

strptime(3): Declare digit d as time_t.

This doesn't make a semantic difference -- d can only take on the ten
values {0,1,2,3,4,5,6,7,8,9}, and the arithmetic with it later all
comes out the same whether the type is unsigned or time_t, even if
time_t were int32_t instead of int64_t.

But it pacifies overzealous compilers used by downstream users of
this code.  And while it's silly to use a much wider type (64-bit
signed) than is needed here to store a single digit, it doesn't
really hurt either (32-bit unsigned is much larger than needed too).

PR lib/58041


To generate a diff of this commit:
cvs rdiff -u -r1.62 -r1.62.6.1 src/lib/libc/time/strptime.c
cvs rdiff -u -r1.15 -r1.15.4.1 src/tests/lib/libc/time/t_strptime.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.