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Avoid conversion from long long to size_t (#1935)

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This commit is contained in:
Victor Zverovich 2020-10-18 08:42:46 -07:00
parent 20d4f2e836
commit f468b203ad
1 changed files with 31 additions and 37 deletions
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68
include/fmt/format.h
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@ -1804,7 +1804,7 @@ OutputIt write_float(OutputIt out, const DecimalFP& fp,
int significand_size = get_significand_size(fp);
static const Char zero = static_cast<Char>('0');
auto sign = fspecs.sign;
long long size = significand_size + (sign ? 1 : 0);
size_t size = to_unsigned(significand_size) + (sign ? 1 : 0);
using iterator = remove_reference_t<decltype(reserve(out, 0))>;
int output_exp = fp.exponent + significand_size - 1;
@ -1821,7 +1821,7 @@ OutputIt write_float(OutputIt out, const DecimalFP& fp,
int num_zeros = 0;
if (fspecs.showpoint) {
num_zeros = (std::max)(fspecs.precision - significand_size, 0);
size += num_zeros;
size += to_unsigned(num_zeros);
} else if (significand_size == 1) {
decimal_point = Char();
}
@ -1829,7 +1829,7 @@ OutputIt write_float(OutputIt out, const DecimalFP& fp,
int exp_digits = 2;
if (abs_output_exp >= 100) exp_digits = abs_output_exp >= 1000 ? 4 : 3;
size += (decimal_point ? 1 : 0) + 2 + exp_digits;
size += to_unsigned((decimal_point ? 1 : 0) + 2 + exp_digits);
char exp_char = fspecs.upper ? 'E' : 'e';
auto write = [=](iterator it) {
if (sign) *it++ = static_cast<Char>(data::signs[sign]);
@ -1840,16 +1840,14 @@ OutputIt write_float(OutputIt out, const DecimalFP& fp,
*it++ = static_cast<Char>(exp_char);
return write_exponent<Char>(output_exp, it);
};
auto usize = to_unsigned(size);
return specs.width > 0
? write_padded<align::right>(out, specs, usize, write)
: base_iterator(out, write(reserve(out, usize)));
return specs.width > 0 ? write_padded<align::right>(out, specs, size, write)
: base_iterator(out, write(reserve(out, size)));
}
int exp = fp.exponent + significand_size;
if (fp.exponent >= 0) {
// 1234e5 -> 123400000[.0+]
size += fp.exponent;
size += to_unsigned(fp.exponent);
int num_zeros = fspecs.precision - exp;
#ifdef FMT_FUZZ
if (num_zeros > 5000)
@ -1857,28 +1855,26 @@ OutputIt write_float(OutputIt out, const DecimalFP& fp,
#endif
if (fspecs.showpoint) {
if (num_zeros <= 0 && fspecs.format != float_format::fixed) num_zeros = 1;
if (num_zeros > 0) size += num_zeros;
if (num_zeros > 0) size += to_unsigned(num_zeros);
}
return write_padded<align::right>(
out, specs, to_unsigned(size), [&](iterator it) {
if (sign) *it++ = static_cast<Char>(data::signs[sign]);
it = write_significand<Char>(it, significand, significand_size);
it = std::fill_n(it, fp.exponent, zero);
if (!fspecs.showpoint) return it;
*it++ = decimal_point;
return num_zeros > 0 ? std::fill_n(it, num_zeros, zero) : it;
});
return write_padded<align::right>(out, specs, size, [&](iterator it) {
if (sign) *it++ = static_cast<Char>(data::signs[sign]);
it = write_significand<Char>(it, significand, significand_size);
it = std::fill_n(it, fp.exponent, zero);
if (!fspecs.showpoint) return it;
*it++ = decimal_point;
return num_zeros > 0 ? std::fill_n(it, num_zeros, zero) : it;
});
} else if (exp > 0) {
// 1234e-2 -> 12.34[0+]
int num_zeros = fspecs.showpoint ? fspecs.precision - significand_size : 0;
size += 1 + (num_zeros > 0 ? num_zeros : 0);
return write_padded<align::right>(
out, specs, to_unsigned(size), [&](iterator it) {
if (sign) *it++ = static_cast<Char>(data::signs[sign]);
it = write_significand(it, significand, significand_size, exp,
decimal_point);
return num_zeros > 0 ? std::fill_n(it, num_zeros, zero) : it;
});
size += 1 + to_unsigned(num_zeros > 0 ? num_zeros : 0);
return write_padded<align::right>(out, specs, size, [&](iterator it) {
if (sign) *it++ = static_cast<Char>(data::signs[sign]);
it = write_significand(it, significand, significand_size, exp,
decimal_point);
return num_zeros > 0 ? std::fill_n(it, num_zeros, zero) : it;
});
}
// 1234e-6 -> 0.001234
int num_zeros = -exp;
@ -1886,17 +1882,15 @@ OutputIt write_float(OutputIt out, const DecimalFP& fp,
fspecs.precision < num_zeros) {
num_zeros = fspecs.precision;
}
size += 2 + num_zeros;
return write_padded<align::right>(
out, specs, to_unsigned(size), [&](iterator it) {
if (sign) *it++ = static_cast<Char>(data::signs[sign]);
*it++ = zero;
if (num_zeros == 0 && significand_size == 0 && !fspecs.showpoint)
return it;
*it++ = decimal_point;
it = std::fill_n(it, num_zeros, zero);
return write_significand<Char>(it, significand, significand_size);
});
size += 2 + to_unsigned(num_zeros);
return write_padded<align::right>(out, specs, size, [&](iterator it) {
if (sign) *it++ = static_cast<Char>(data::signs[sign]);
*it++ = zero;
if (num_zeros == 0 && significand_size == 0 && !fspecs.showpoint) return it;
*it++ = decimal_point;
it = std::fill_n(it, num_zeros, zero);
return write_significand<Char>(it, significand, significand_size);
});
}
template <typename Char, typename OutputIt, typename T,