[libc] Remove the #include <stdlib.h> header (#114453)

[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] 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][NFC] Rename files

This patch mostly renames files so it better reflects the function they declare.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D155607

[libc][NFC] Refactor internal errno.

This is in preparation for the transition to a solution to make libc tests
hermetic with respect to their use of errno. The implementation of strdup
has been swi

[libc][NFC] Refactor internal errno.

This is in preparation for the transition to a solution to make libc tests
hermetic with respect to their use of errno. The implementation of strdup
has been switched over to libc_errno as an example of what the code looks
like in the new way.

See #61037 for more information.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D144928

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[libc] Add custom operator new to handle allocation failures gracefully.

This patch adds the implementation of the custom operator new functions.
The implementation of the internal strdup has been u

[libc] Add custom operator new to handle allocation failures gracefully.

This patch adds the implementation of the custom operator new functions.
The implementation of the internal strdup has been updated to use
operator new for allocation.

We will make it a policy and document that all allocations have to go
through the libc's own operator new. A future change will also add
operator delete replacements and make it a policy that deallocations in
libc internal code have to go through those replacements.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D139584

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[libc] Move strdup implementation to a new header

The `strdup` family of functions rely on `malloc` to be implemented.
Its presence in the `string_utils.h` header meant that compiling many of
the st

[libc] Move strdup implementation to a new header

The `strdup` family of functions rely on `malloc` to be implemented.
Its presence in the `string_utils.h` header meant that compiling many of
the string functions relied on `malloc` being implementated as well.
This patch simply moves the implementation into a new file to avoid
including `stdlib.h` from the other string functions. This was a barrier
for compiling string functions for the GPU where there is no malloc
currently.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D138607

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[libc] Add implementation of the POSIX getcwd function.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D135905

[libc][clang-tidy] fix namespace check for externals

Up until now, all references to `errno` were marked with `NOLINT`, since
it was technically calling an external function. This fixes the lint
rul

[libc][clang-tidy] fix namespace check for externals

Up until now, all references to `errno` were marked with `NOLINT`, since
it was technically calling an external function. This fixes the lint
rules so that `errno`, as well as `malloc`, `calloc`, `realloc`, and
`free` are all allowed to be called as external functions. All of the
relevant `NOLINT` comments have been removed, and the documentation has
been updated.

Reviewed By: sivachandra, lntue, aaron.ballman

Differential Revision: https://reviews.llvm.org/D113946

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[libc] Make string entrypoints mutualy exclusive.

For example, strcpy does not pull memcpy now.

Reviewed By: gchatelet

Differential Revision: https://reviews.llvm.org/D114300

[libc] add strdup implementation

Add an implementation for strdup.

Reviewed By: lntue, sivachandra

Differential Revision: https://reviews.llvm.org/D111584