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libstdc++: Define std::stof fallback in terms of std::stod [PR110653]

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For targets without std::strtof we can define std::stof by calling
std::stod and then checking if the result is out of range of float.

libstdc++-v3/ChangeLog:

	PR libstdc++/110653
	* include/bits/basic_string.h [!_GLIBCXX_HAVE_STRTOF] (stof):
	Define in terms of std::stod.
This commit is contained in:
Jonathan Wakely
2023-07-15 20:41:28 +01:00
parent 58303d4280
commit f0b0c21152
1 changed files with 16 additions and 0 deletions
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16
libstdc++-v3/include/bits/basic_string.h
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@@ -4153,6 +4153,22 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
inline float
stof(const string& __str, size_t* __idx = 0)
{ return __gnu_cxx::__stoa(&std::strtof, "stof", __str.c_str(), __idx); }
#else
inline float
stof(const string& __str, size_t* __idx = 0)
{
double __d = std::stod(__str, __idx);
if (__builtin_isfinite(__d))
{
double __abs_d = __builtin_fabs(__d);
if (__abs_d < __FLT_MIN__ || __abs_d > __FLT_MAX__)
{
errno = ERANGE;
std::__throw_out_of_range("stof");
}
}
return __d;
}
#endif
#if _GLIBCXX_USE_C99_STDLIB || _GLIBCXX_HAVE_STRTOLD