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Simplify error handling in parse_nonnegative_int

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This commit is contained in:
Victor Zverovich
2021-06-14 16:05:37 -07:00
parent a59678f376
commit e421d52713
4 changed files with 40 additions and 38 deletions
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include/fmt/core.h
+19 -12
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@@ -2099,9 +2099,9 @@ inline auto find<false, char>(const char* first, const char* last, char value,
// Parses the range [begin, end) as an unsigned integer. This function assumes
// that the range is non-empty and the first character is a digit.
template <typename Char, typename ErrorHandler>
template <typename Char>
FMT_CONSTEXPR auto parse_nonnegative_int(const Char*& begin, const Char* end,
ErrorHandler&& eh) -> int {
int error_value) noexcept -> int {
FMT_ASSERT(begin != end && '0' <= *begin && *begin <= '9', "");
unsigned value = 0, prev = 0;
auto p = begin;
@@ -2115,13 +2115,11 @@ FMT_CONSTEXPR auto parse_nonnegative_int(const Char*& begin, const Char* end,
if (num_digits <= std::numeric_limits<int>::digits10)
return static_cast<int>(value);
// Check for overflow.
const unsigned big = to_unsigned((std::numeric_limits<int>::max)());
if (num_digits == std::numeric_limits<int>::digits10 + 1 &&
prev * 10ull + unsigned(p[-1] - '0') <= big) {
return static_cast<int>(value);
}
eh.on_error("number is too big");
return -1;
const unsigned max = to_unsigned((std::numeric_limits<int>::max)());
return num_digits == std::numeric_limits<int>::digits10 + 1 &&
prev * 10ull + unsigned(p[-1] - '0') <= max
? static_cast<int>(value)
: error_value;
}
// Parses fill and alignment.
@@ -2177,7 +2175,8 @@ FMT_CONSTEXPR auto do_parse_arg_id(const Char* begin, const Char* end,
if (c >= '0' && c <= '9') {
int index = 0;
if (c != '0')
index = parse_nonnegative_int(begin, end, handler);
index =
parse_nonnegative_int(begin, end, (std::numeric_limits<int>::max)());
else
++begin;
if (begin == end || (*begin != '}' && *begin != ':'))
@@ -2226,7 +2225,11 @@ FMT_CONSTEXPR auto parse_width(const Char* begin, const Char* end,
FMT_ASSERT(begin != end, "");
if ('0' <= *begin && *begin <= '9') {
handler.on_width(parse_nonnegative_int(begin, end, handler));
int width = parse_nonnegative_int(begin, end, -1);
if (width != -1)
handler.on_width(width);
else
handler.on_error("number is too big");
} else if (*begin == '{') {
++begin;
if (begin != end) begin = parse_arg_id(begin, end, width_adapter{handler});
@@ -2257,7 +2260,11 @@ FMT_CONSTEXPR auto parse_precision(const Char* begin, const Char* end,
++begin;
auto c = begin != end ? *begin : Char();
if ('0' <= c && c <= '9') {
handler.on_precision(parse_nonnegative_int(begin, end, handler));
auto precision = parse_nonnegative_int(begin, end, -1);
if (precision != -1)
handler.on_precision(precision);
else
handler.on_error("number is too big");
} else if (c == '{') {
++begin;
if (begin != end)