From 9ce6f477167c598c122ab6f558ac8a95ece9c5c3 Mon Sep 17 00:00:00 2001 From: Přemysl Eric Janouch Date: Sun, 7 Apr 2024 16:00:07 +0200 Subject: Use more precise filesizes The behaviour differs from GNU `ls -lh` in that we use binary units, meaning we get 1023 before 1.0K rather than 999 before 1.0K, which is nonetheless still four characters wide. --- sdn.cpp | 30 +++++++++++++++++++++++++----- 1 file changed, 25 insertions(+), 5 deletions(-) diff --git a/sdn.cpp b/sdn.cpp index 9496475..48f425c 100644 --- a/sdn.cpp +++ b/sdn.cpp @@ -640,6 +640,25 @@ fun ls_format (const entry &e, bool for_target) -> chtype { return format; } +fun suffixize (off_t size, unsigned shift, wchar_t suffix, std::wstring &out) + -> bool { + // Prevent implementation-defined and undefined behaviour + if (size < 0 || shift >= sizeof size * 8) + return false; + + off_t divided = size >> shift; + if (divided >= 10) { + out.assign (std::to_wstring (divided)).append (1, suffix); + return true; + } else if (divided > 0) { + unsigned times_ten = size / double (off_t (1) << shift) * 10.0; + out.assign ({L'0' + wchar_t (times_ten / 10), L'.', + L'0' + wchar_t (times_ten % 10), suffix}); + return true; + } + return false; +} + fun make_entry (const struct dirent *f) -> entry { entry e; e.filename = f->d_name; @@ -690,11 +709,12 @@ fun make_entry (const struct dirent *f) -> entry { ? apply_attrs (grp->second, 0) : apply_attrs (to_wstring (info.st_gid), 0); - auto size = to_wstring (info.st_size); - if (info.st_size >> 40) size = to_wstring (info.st_size >> 40) + L"T"; - else if (info.st_size >> 30) size = to_wstring (info.st_size >> 30) + L"G"; - else if (info.st_size >> 20) size = to_wstring (info.st_size >> 20) + L"M"; - else if (info.st_size >> 10) size = to_wstring (info.st_size >> 10) + L"K"; + std::wstring size; + if (!suffixize (info.st_size, 40, L'T', size) && + !suffixize (info.st_size, 30, L'G', size) && + !suffixize (info.st_size, 20, L'M', size) && + !suffixize (info.st_size, 10, L'K', size)) + size = to_wstring (info.st_size); e.cols[entry::SIZE] = apply_attrs (size, 0); wchar_t buf[32] = L""; -- cgit v1.2.3-70-g09d2