[libc][NFC] Cleanup time.h (#122027)

While working on strftime I noticed some constants were being defined in
unexpected places. One thing led to another, and I ended up doing a
major cleanup of the

[libc][NFC] Cleanup time.h (#122027)

While working on strftime I noticed some constants were being defined in
unexpected places. One thing led to another, and I ended up doing a
major cleanup of the time functions.

What's included:
All uses of <time.h> in /src and /test removed (except for LibcTest.cpp)
The various time constants have been moved to time_constants.h, and the
`time_constants` namespace.
struct tm gets its own type indirection header now.

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[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98597)

This is a part of #97655.

Revert "[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration" (#98593)

Reverts llvm/llvm-project#98075

bots are broken

[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98075)

This is a part of #97655.

[libc] Add C23 limits.h header. (#78887)

[libc] Mass replace enclosing namespace (#67032)

This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079

[libc] Fix overflow check for 32 bit long time_t (#65394)

This patch fixes the overflow check in update_from_seconds, used by
gmtime, gmtime_r and mktime.

In update_from_seconds, total_seconds i

[libc] Fix overflow check for 32 bit long time_t (#65394)

This patch fixes the overflow check in update_from_seconds, used by
gmtime, gmtime_r and mktime.

In update_from_seconds, total_seconds is a int64_t and the previous
overflow check for when sizeof(time_t) == 4 would check if it was <
0x80000000 and > 0x7FFFFFFF, however, this check would cause the
following issues:

1. Valid negative numbers would be discarded, e.g., -1 is
0xffffffffffffffff as a int64_t, outside the range of the overflow
check.

2. Some valid positive numbers would be discarded because the hex
constants were being implicitly converted to int64_t, e.g., 0x80000000
would be implicitly converted to 2147483648, instead of -2147483648.

The fix for both cases was to static_cast total_seconds and the
constants to time_t if sizeof(time_t) == 4. The behaviour is not changed
in systems with sizeof(time_t) == 8.

---------

Signed-off-by: Mikhail R. Gadelha <mikhail@igalia.com>

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[libc][cleanup] Fix most conversion warnings

This patch is large, but is almost entirely just adding casts to calls
to syscall_impl. Much of the work was done programatically, with human
checking wh

[libc][cleanup] Fix most conversion warnings

This patch is large, but is almost entirely just adding casts to calls
to syscall_impl. Much of the work was done programatically, with human
checking when the syntax or types got confusing.

Reviewed By: mcgrathr

Differential Revision: https://reviews.llvm.org/D156950

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[libc][NFC] Start cleanup of time functions

The time functions have not yet been updated to match our new coding
patterns. This patch removes some unnecessary includes, adjusts the
names of the test

[libc][NFC] Start cleanup of time functions

The time functions have not yet been updated to match our new coding
patterns. This patch removes some unnecessary includes, adjusts the
names of the test targets, and adds several TODO comments. It is my
intention to follow this patch up with additional cleanup.

Reviewed By: sivachandra, rtenneti

Differential Revision: https://reviews.llvm.org/D149487

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[libc] apply new lint rules

This patch applies the lint rules described in the previous patch. There
was also a significant amount of effort put into manually fixing things,
since all of the templat

[libc] apply new lint rules

This patch applies the lint rules described in the previous patch. There
was also a significant amount of effort put into manually fixing things,
since all of the templated functions, or structs defined in /spec, were
not updated and had to be handled manually.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D114302

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This introduces gmtime to LLVM libc, based on C99/C2X/Single Unix Spec.

This change doesn't handle TIMEZONE, tm_isdst and leap seconds.

Moved shared code between mktime and gmtime into time_utils.c

This introduces gmtime to LLVM libc, based on C99/C2X/Single Unix Spec.

This change doesn't handle TIMEZONE, tm_isdst and leap seconds.

Moved shared code between mktime and gmtime into time_utils.cpp.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D98467

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