llvm-project.git/libc/test/src/stdio/snprintf_test.cpp, branch main

[libc] Add printf error handling (with fixes #2) (#166517)

2025-11-05T21:09:53+00:00

https://github.com/llvm/llvm-project/issues/159474

Another try of trying to land
https://github.com/llvm/llvm-project/pull/166382
- Fix some leftover tests checking for specific  errnos
- Guard errno checking tests to not run on the GPU

@michaelrj-google

Revert commit d8e5698 and 15b19c7 (#166498)

2025-11-05T03:43:16+00:00

[libc] Add printf error handling (with fixes) (#166382)

2025-11-05T00:20:51+00:00

https://github.com/llvm/llvm-project/issues/159474

Resubmitting https://github.com/llvm/llvm-project/pull/162876 with fixes
as it broke some buildbots:
 - Fix comparisons of integer expressions of different signedness
- Not check for specific errnos in tests, as they might not be available
on all platforms

Revert "[libc] Add printf error handling" (#166232)

2025-11-03T20:50:11+00:00

[libc] Add printf error handling (#162876)

2025-11-03T19:15:14+00:00

[#159474](https://github.com/llvm/llvm-project/issues/159474)

- All printf variants set errno and consistently return -1 on error,
instead of returning various predefined error codes
- Return value overflow handling is added

[libc] Fix printf handling of INT_MIN width (#101729)

2024-08-02T20:45:54+00:00

Prevously, if INT_MIN was passed as a wildcard width to a printf
conversion the parser would attempt to negate it to get the positive
width (and set the left justify flag), but it would underflow and the
width would be treated as 0. This patch corrects the issue by instead
treating a width of INT_MIN as identical to -INT_MAX.

Also includes docs changes to explain this behavior and adding b to the
list of int conversions.

[libc] Mass replace enclosing namespace (#67032)

2023-09-26T09:45:04+00:00

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] Move printf writer to new design

2023-07-20T18:08:20+00:00

The new printf writer design focuses on optimizing the fast path. It
inlines any write to a buffer or string, and by handling buffering
itself can more effectively work with both internal and external file
implementations. The overflow hook should allow for expansion to
asprintf with minimal extra code.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D153999

[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

2023-02-07T19:45:51+00:00

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces in a straight
forward manner if LLVM_INCLUDE_TESTS is OFF. Future patches will also move
the MPFR wrapper and testutils into the 'test' directory.

[libc] add snprintf

2022-05-17T20:32:59+00:00

After adding sprintf, snprintf is simple. The functions are very
similar. The tests only cover the behavior of the max length since the
sprintf tests should cover the other behavior.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D125826