diff options
Diffstat (limited to 'absl/strings/str_cat.cc')
| -rw-r--r-- | absl/strings/str_cat.cc | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/absl/strings/str_cat.cc b/absl/strings/str_cat.cc index 99eb28908c19..3fe8c95eca9e 100644 --- a/absl/strings/str_cat.cc +++ b/absl/strings/str_cat.cc @@ -45,6 +45,37 @@ AlphaNum::AlphaNum(Hex hex) { piece_ = absl::string_view(beg, end - beg); } +AlphaNum::AlphaNum(Dec dec) { + assert(dec.width <= numbers_internal::kFastToBufferSize); + char* const end = &digits_[numbers_internal::kFastToBufferSize]; + char* const minfill = end - dec.width; + char* writer = end; + uint64_t value = dec.value; + bool neg = dec.neg; + while (value > 9) { + *--writer = '0' + (value % 10); + value /= 10; + } + *--writer = '0' + value; + if (neg) *--writer = '-'; + + ptrdiff_t fillers = writer - minfill; + if (fillers > 0) { + // Tricky: if the fill character is ' ', then it's <fill><+/-><digits> + // But...: if the fill character is '0', then it's <+/-><fill><digits> + bool add_sign_again = false; + if (neg && dec.fill == '0') { // If filling with '0', + ++writer; // ignore the sign we just added + add_sign_again = true; // and re-add the sign later. + } + writer -= fillers; + std::fill_n(writer, fillers, dec.fill); + if (add_sign_again) *--writer = '-'; + } + + piece_ = absl::string_view(writer, end - writer); +} + // ---------------------------------------------------------------------- // StrCat() // This merges the given strings or integers, with no delimiter. This |