projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 2e451ce8 RH |
1 | static char sccsid[] = " allow.c 1.1 82/05/11 "; |
| 2 | ||
| 3 | #include "back.h" | |
| 4 | ||
| 5 | movallow () { | |
| 6 | ||
| 7 | register int i, m, iold; | |
| 8 | int r; | |
| 9 | ||
| 10 | if (d0) | |
| 11 | swap; | |
| 12 | m = (D0 == D1? 4: 2); | |
| 13 | for (i = 0; i < 4; i++) | |
| 14 | p[i] = bar; | |
| 15 | i = iold = 0; | |
| 16 | while (i < m) { | |
| 17 | if (*offptr == 15) | |
| 18 | break; | |
| 19 | h[i] = 0; | |
| 20 | if (board[bar]) { | |
| 21 | if (i == 1 || m == 4) | |
| 22 | g[i] = bar+cturn*D1; | |
| 23 | else | |
| 24 | g[i] = bar+cturn*D0; | |
| 25 | if (r = makmove(i)) { | |
| 26 | if (d0 || m == 4) | |
| 27 | break; | |
| 28 | swap; | |
| 29 | movback (i); | |
| 30 | if (i > iold) | |
| 31 | iold = i; | |
| 32 | for (i = 0; i < 4; i++) | |
| 33 | p[i] = bar; | |
| 34 | i = 0; | |
| 35 | } else | |
| 36 | i++; | |
| 37 | continue; | |
| 38 | } | |
| 39 | if ((p[i] += cturn) == home) { | |
| 40 | if (i > iold) | |
| 41 | iold = i; | |
| 42 | if (m == 2 && i) { | |
| 43 | movback(i); | |
| 44 | p[i--] = bar; | |
| 45 | if (p[i] != bar) | |
| 46 | continue; | |
| 47 | else | |
| 48 | break; | |
| 49 | } | |
| 50 | if (d0 || m == 4) | |
| 51 | break; | |
| 52 | swap; | |
| 53 | movback (i); | |
| 54 | for (i = 0; i < 4; i++) | |
| 55 | p[i] = bar; | |
| 56 | i = 0; | |
| 57 | continue; | |
| 58 | } | |
| 59 | if (i == 1 || m == 4) | |
| 60 | g[i] = p[i]+cturn*D1; | |
| 61 | else | |
| 62 | g[i] = p[i]+cturn*D0; | |
| 63 | if (g[i]*cturn > home) { | |
| 64 | if (*offptr >= 0) | |
| 65 | g[i] = home; | |
| 66 | else | |
| 67 | continue; | |
| 68 | } | |
| 69 | if (board[p[i]]*cturn > 0 && (r = makmove(i)) == 0) | |
| 70 | i++; | |
| 71 | } | |
| 72 | movback (i); | |
| 73 | return (iold > i? iold: i); | |
| 74 | } |