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Peg colours in the current guess must be within the range of colours for the current game, just as they must be for completed moves. Otherwise is_markable() can cause a buffer overrun. Since there's no way for decode_ui() to report an error, it just ignores the bad peg colours. I've also added an assertion to catch this problem in is_markable(). The following save file demonstrates the problem when loaded in a build with AddressSanitizer: SAVEFILE:41:Simon Tatham's Portable Puzzle Collection VERSION :1:1 GAME :5:Guess PARAMS :9:c6p4g10Bm CPARAMS :9:c6p4g10Bm DESC :8:2de917c0 UI :7:7,7,7,7 NSTATES :1:1 STATEPOS:1:1
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/>.