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do not rely on global locale when converting in format

master
Daniel Kolesa 2017-11-13 17:15:30 +01:00
parent e5a21382af
commit 84fc2bc9c4
2 changed files with 21 additions and 9 deletions
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3
examples/format.cc
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@ -142,8 +142,7 @@ int main() {
writefln(
"\"%d\", \"%f\", \"%X\"", 123456789, 12345.6789123, 0x123456789ABCDEF
);
std::locale::global(std::locale{""});
cout.imbue(std::locale{});
cout.imbue(std::locale{""});
writefln("\n-- number format with system locale --");
writefln(
"\"%d\", \"%f\", \"%X\"", 123456789, 12345.6789123, 0x123456789ABCDEF

27
ostd/format.hh
View File

@ -23,6 +23,8 @@
#include <cstddef>
#include <climits>
#include <cmath>
#include <cctype>
#include <climits>
#include <utility>
#include <stdexcept>
#include <locale>
@ -234,8 +236,17 @@ namespace detail {
template<typename T, typename R>
inline constexpr bool fmt_tofmt_test = decltype(test_tofmt<T, R>(0))::value;
/* any unicode character can be encoded in 6 bytes */
constexpr std::size_t MaxMultibyte = 6;
inline int wc_to_mb_loc(wchar_t c, char *buf, std::locale const &loc) {
auto &f = std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(loc);
std::mbstate_t mb{};
wchar_t const *fromn;
char *ton;
auto ret = f.out(mb, &c, &c + 1, fromn, buf, &buf[MB_LEN_MAX], ton);
if (ret != std::codecvt_base::ok) {
return -1;
}
return ton - &buf[0];
}
}
/** @brief A structure implementing type safe C-style formatting.
@ -1056,8 +1067,8 @@ private:
/* here starts the bullshit */
auto const &fac = std::use_facet<std::numpunct<wchar_t>>(p_loc);
char tseps[detail::MaxMultibyte];
int ntsep = wctomb(tseps, fac.thousands_sep());
char tseps[MB_LEN_MAX];
int ntsep = detail::wc_to_mb_loc(fac.thousands_sep(), tseps, p_loc);
auto const &grp = fac.grouping();
auto grpp = reinterpret_cast<unsigned char const *>(grp.data());
@ -1190,7 +1201,7 @@ private:
/* this is also bullshit */
fmt_num_put<R> nump;
nump.put(
fmt_out<R>{&writer}, st,
fmt_out<R>{&writer, &p_loc}, st,
(p_flags & FMT_FLAG_ZERO) ? L'0' : L' ', val
);
}
@ -1478,8 +1489,9 @@ private:
using difference_type = typename std::char_traits<wchar_t>::off_type;
fmt_out &operator=(wchar_t c) {
char buf[detail::MaxMultibyte];
for (int i = 0, j = wctomb(buf, c); i < j; ++i) {
char buf[MB_LEN_MAX];
int j = detail::wc_to_mb_loc(c, buf, *p_loc);
for (int i = 0; i < j; ++i) {
p_out->put(buf[i]);
}
return *this;
@ -1490,6 +1502,7 @@ private:
fmt_out &operator++(int) { return *this; }
R *p_out;
std::locale const *p_loc;
};
template<typename R>