diff options
| -rw-r--r-- | src/town_gui.cpp | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/src/town_gui.cpp b/src/town_gui.cpp index 3aa49f2d1..d846f4ee9 100644 --- a/src/town_gui.cpp +++ b/src/town_gui.cpp @@ -109,15 +109,22 @@ uint GetMaskOfTownActions(int *nump, PlayerID pid, const Town *t) return buttons; } +/** + * Get the position of the Nth set bit. + * + * If there is no Nth bit set return -1 + * + * @param bits The value to search in + * @param n The Nth set bit from which we want to know the position + * @return The position of the Nth set bit + */ static int GetNthSetBit(uint32 bits, int n) { - int i = 0; - if (n >= 0) { - do { - if (bits & 1 && --n < 0) return i; - i++; - } while (bits >>= 1); + for (uint i = 0; bits != 0; bits >>= 1, i++) { + if (bits & 1) n--; + if (n < 0) return i; + } } return -1; } |