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af7fca797a
Fixes #8825 We're using the fast_float library[1] in our (compiled-in) floating-point fast_float_strtod implementation for faster and more portable parsing of 64 decimal strings. The single file fast_float.h is an amalgamation of the entire library, which can be (re)generated with the amalgamate.py script (from the fast_float repository) via the command: ``` python3 ./script/amalgamate.py --license=MIT > $REDIS_SRC/deps/fast_float/fast_float.h ``` [1]: https://github.com/fastfloat/fast_float The used commit from fast_float library was the one from https://github.com/fastfloat/fast_float/releases/tag/v3.10.1 --------- Co-authored-by: fcostaoliveira <filipe@redis.com>
33 lines
1.3 KiB
C++
33 lines
1.3 KiB
C++
#include "fast_float.h"
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#include <iostream>
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#include <string>
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#include <system_error>
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#include <cerrno>
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/* Convert NPTR to a double using the fast_float library.
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*
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* This function behaves similarly to the standard strtod function, converting
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* the initial portion of the string pointed to by `nptr` to a `double` value,
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* using the fast_float library for high performance. If the conversion fails,
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* errno is set to EINVAL error code.
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*
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* @param nptr A pointer to the null-terminated byte string to be interpreted.
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* @param endptr A pointer to a pointer to character. If `endptr` is not NULL,
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* it will point to the character after the last character used
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* in the conversion.
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* @return The converted value as a double. If no valid conversion could
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* be performed, returns 0.0.
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* If ENDPTR is not NULL, a pointer to the character after the last one used
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* in the number is put in *ENDPTR. */
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extern "C" double fast_float_strtod(const char *nptr, char **endptr) {
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double result = 0.0;
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auto answer = fast_float::from_chars(nptr, nptr + strlen(nptr), result);
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if (answer.ec != std::errc()) {
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errno = EINVAL; // Fallback to for other errors
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}
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if (endptr != NULL) {
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*endptr = (char *)answer.ptr;
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}
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return result;
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}
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