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Fix the error when formatting a float with a filled buffer on MSVC.

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This commit is contained in:
Victor Zverovich 2014-04-23 18:37:08 -07:00
parent cb316b13b1
commit 33baa8f382
1 changed files with 9 additions and 0 deletions
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9
format.cc
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@ -320,6 +320,15 @@ void fmt::BasicWriter<Char>::FormatDouble(
Char fill = static_cast<Char>(spec.fill());
for (;;) {
std::size_t size = buffer_.capacity() - offset;
#if _MSC_VER
// MSVC's vsnprintf_s doesn't work with zero size, so reserve
// space for at least one extra character to make the size non-zero.
// Note that the buffer's capacity will increase by more than 1.
if (size == 0) {
buffer_.reserve(offset + 1);
size = buffer_.capacity() - offset;
}
#endif
Char *start = &buffer_[offset];
int n = internal::CharTraits<Char>::FormatFloat(
start, size, format, width_for_sprintf, precision, value);