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Now that https://github.com/llvm/llvm-project/pull/166517 has landed and
[Writer](https://github.com/llvm/llvm-project/blob/main/libc/src/stdio/printf_core/writer.h#L130)
has been refactored to track bytes written as size_t, strftime can be
refactored as well to handle size_t return values.
Can't think of a proper way to test this without creating a 2GB+ string,
but existing tests cover most cases.
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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
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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
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[#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
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<stdint.h> includes. (#150303)
https://github.com/llvm/llvm-project/issues/149993
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Summary:
Currently we dispatch the writing mode off of a runtime enum passed in
by the constructor. This causes very unfortunate codegen for the GPU
targets where we get worst-case codegen because of the unused function
pointer for `sprintf`. Instead, this patch moves all of this to a
template so it can be masked out. This results in no dynamic stack and
uses 60 VGPRs instead of 117. It also compiles about 5x as fast.
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Forgot to change a size_t to an int, which caused warnings on gcc but
not clang for some reason. Regardless, this patch fixes the issue.
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Implements the posix-specified strftime conversions for the default
locale, along with comprehensive unit tests. This reuses a lot of design
from printf, as well as the printf writer.
Roughly based on #111305, but with major rewrites.
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