Mpf fixups #24
Mpf fixups #24
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bryant
commented
Jun 5, 2017
bryant
commented
- self doesn't need to be mut when get_str
- impl Display and Debug for Mpf
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Don’t you think the |
| /// Due to the way `Mpf::get_str` works, the output contains an implicit | ||
| /// radix point to the left of the first digit. `3.14`, for instance, will | ||
| /// print as `314e1` which means `0.314e1`. | ||
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
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No need to duplicate code; you can just delegate to fmt::Display::fmt(&self, f).
src/mpf.rs
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| let out; | ||
| unsafe{ | ||
| out = CString::from_raw(__gmpf_get_str(c_str.into_raw(), exp, base, n_digits, &mut self.mpf)); | ||
| out = CString::from_raw(__gmpf_get_str(c_str.into_raw(), exp, base, n_digits, &self.mpf)); |
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Your tests have exposed the (pre-existing) bug that this is a blatant buffer overflow of c_str. The mpf_get_str documentation says “The area at str has to have space for the largest possible number represented by a s1n long limb array, plus one extra character.”
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i'm not seeing a quick and easy entry point to calculate the number of digits. the easiest way would be to let gmp_allocate_func do the work.
from https://gmplib.org/manual/Converting-Floats.html : `Function: char * mpf_get_str (char *str, mp_exp_t *expptr, int base, size_t n_digits, const mpf_t op)`
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will rebase after #25 is merged. |
src/mpf.rs
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| impl fmt::Display for Mpf { | ||
| /// Due to the way `Mpf::get_str` works, the output contains an implicit | ||
| /// radix point to the left of the first digit. `3.14`, for instance, will | ||
| /// print as `314e1` which means `0.314e1`. |
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this incorrectly created an uninitialized Vec, and using uninitialized isn't worth it anyway.
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