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Fix handling of negative error codes in format_error_code

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This commit is contained in:
vitaut 2016-03-02 07:01:21 -08:00
parent 6e820841d4
commit 9d577cae6f
2 changed files with 17 additions and 4 deletions
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9
cppformat/format.cc
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@ -207,10 +207,15 @@ void format_error_code(fmt::Writer &out, int error_code,
out.clear();
static const char SEP[] = ": ";
static const char ERROR_STR[] = "error ";
fmt::internal::IntTraits<int>::MainType ec_value = error_code;
// Subtract 2 to account for terminating null characters in SEP and ERROR_STR.
std::size_t error_code_size = sizeof(SEP) + sizeof(ERROR_STR) - 2;
error_code_size += fmt::internal::count_digits(ec_value);
typedef fmt::internal::IntTraits<int>::MainType MainType;
MainType abs_value = static_cast<MainType>(error_code);
if (internal::is_negative(error_code)) {
abs_value = 0 - abs_value;
++error_code_size;
}
error_code_size += fmt::internal::count_digits(abs_value);
if (message.size() <= fmt::internal::INLINE_BUFFER_SIZE - error_code_size)
out << message << SEP;
out << ERROR_STR << error_code;

12
test/format-impl-test.cc
View File

@ -101,13 +101,21 @@ TEST(FormatTest, FormatErrorCode) {
fmt::format_error_code(w, 42, prefix);
EXPECT_EQ(msg, w.str());
}
{
int codes[] = {42, -1};
for (std::size_t i = 0, n = sizeof(codes) / sizeof(*codes); i < n; ++i) {
// Test maximum buffer size.
msg = fmt::format("error {}", codes[i]);
fmt::MemoryWriter w;
std::string prefix(
fmt::internal::INLINE_BUFFER_SIZE - msg.size() - sep.size(), 'x');
fmt::format_error_code(w, 42, prefix);
fmt::format_error_code(w, codes[i], prefix);
EXPECT_EQ(prefix + sep + msg, w.str());
std::size_t size = fmt::internal::INLINE_BUFFER_SIZE;
EXPECT_EQ(size, w.size());
w.clear();
// Test with a message that doesn't fit into the buffer.
prefix += 'x';
fmt::format_error_code(w, codes[i], prefix);
EXPECT_EQ(msg, w.str());
}
}