Conversions from string/file offset to line and column.
Source Column.
Source Line.
Convert byte offset offset in txt to (line, column) byte offsets.
Line and column, both 0-based byte offsets.
File|Data Offset (in bytes).
https://gcc.gnu.org/codingconventions.html#Diagnostics
https://clang.llvm.org/diagnostics.html
See Source File
Conversions from string/file offset to line and column.