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Integer division in C rounds towards zero, so if you want it to consistently round down you need to ensure that the arguments are positive. FROMDRAW() didn't do that, so clicks off the top and left corners of the grid got treated as being in the top row or left column (row and column 0) rather than ignored. This commit fixes the macro so that it offsets its argument upward before the division and compensates afterwards.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.