[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

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[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] Refactor scanf reader to match printf (#66023)

In a previous patch, the printf writer was rewritten to use a single
writer class with a buffer and a callback hook. This patch refactors
scanf'

[libc] Refactor scanf reader to match printf (#66023)

In a previous patch, the printf writer was rewritten to use a single
writer class with a buffer and a callback hook. This patch refactors
scanf's reader to match conceptually.

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[libc] Template the printf / scanf parser class (#66277)

Summary:
The parser class for stdio currently accepts different argument
providers. In-tree this is only used for a fuzzer test, however, the

[libc] Template the printf / scanf parser class (#66277)

Summary:
The parser class for stdio currently accepts different argument
providers. In-tree this is only used for a fuzzer test, however, the
proposed implementation of the GPU handling of printf / scanf will
require custom argument handlers. This makes the current approach of
using a preprocessor macro messier. This path proposed folding this
logic into a template instantiation. The downside to this is that
because the implementation of the parser class is placed into an
implementation file we need to manually instantiate the needed templates
which will slightly bloat binary size. Alternatively we could remove the
implementation file, or key off of the `libc` external packaging macro
so it is not present in the installed version.

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[libc] add scanf current position conversion

To add the current position (%n) conversion, some reorganization needed
to be done. The "write a number to this pointer using the length
modifier" utilit

[libc] add scanf current position conversion

To add the current position (%n) conversion, some reorganization needed
to be done. The "write a number to this pointer using the length
modifier" utilities and a couple other shared parsing functions have
been moved into converter_utils.h. This made implementing
current_pos_converter very simple.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D142495

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[libc] fix scanf error handling

Scanf is supposed to return EOF when it fails to make any conversions
and there is an input failure. Previously it would return EOF on a
matching failure, which may b

[libc] fix scanf error handling

Scanf is supposed to return EOF when it fails to make any conversions
and there is an input failure. Previously it would return EOF on a
matching failure, which may be an input failure but can also be a
parsing error.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D139891

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[libc] add scanf string converters

This patch adds the basic conversion facilities to scanf as well as unit
tests for them. It also adds scanf_main which will be used for the
eventual scanf entrypoi

[libc] add scanf string converters

This patch adds the basic conversion facilities to scanf as well as unit
tests for them. It also adds scanf_main which will be used for the
eventual scanf entrypoints.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D137376

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