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Scanf parsing reads the longest possibly valid prefix for a given
conversion. Then, it performs the conversion on that string. In the case
of "0xZ" with a hex conversion (either "%x" or "%i") the longest
possibly valid prefix is "0x", which makes it the "input item" (per the
standard). The sequence "0x" is not a "matching sequence" for a hex
conversion, meaning it results in a matching failure, and parsing ends.
This is because to know that there's no valid digit after "0x" it reads
the 'Z', but it can only put back one character (the 'Z') leaving it
with consuming an invalid sequence.
(inspired by a thread on the libc-coord mailing list:
https://www.openwall.com/lists/libc-coord/2024/10/15/1, see 7.32.6.2 in
the standard for more details.)
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https://github.com/llvm/llvm-project/issues/60481
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Summary:
We can enable the sscanf function on the GPU now. This required adding
the configs to the scanf list so that the GPU build didn't do float
conversions.
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Umbrella bug #83182
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- [libc][NFC] Rename FPBits nan functions
- rename build_signaling_nan in signaling_nan
- rename build_quiet_nan to quiet_nan
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- reland #79113
- Fix aarch64 RISC-V build
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Reverts llvm/llvm-project#79113
It broke aarch64 build bot machines.
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This patch reduces the surface of `FPBits`.
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(#73948)
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`PlatformDefs.h` does not bring a lot of value as a separate file.
It is transitively included in `FloatProperties.h` and `FPBits.h`. This
patch sinks it into `FloatProperties.h` and removes the associated build
targets.
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up its constants return types. (#71298)
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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
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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.
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This patch adds the last conversion for scanf, %p. It is set up to match
the %p implementation in our printf.
Reviewed By: sivachandra, lntue
Differential Revision: https://reviews.llvm.org/D142510
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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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This patch adds the %f/F/e/E/g/G/a/A conversions for scanf, as well as
accompanying tests. This implementation matches the definition set forth
in the standard, which may conflict with some other implementations.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D141091
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This patch adds the integer conversions %d/i/u/o/x/X to scanf as well as
unit tests to check their correctness.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D138880
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This patch adds scanf, sscanf, and fscanf entrypoints. It also adds unit
tests for sscanf and a basic test to fscanf. The scanf function is
basically impossible to test in an automated fashion due to it recieving
user input.
Reviewed By: sivachandra, lntue
Differential Revision: https://reviews.llvm.org/D138076
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