Source:NetHack 3.0.0/rnd.c
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1. /* SCCS Id: @(#)rnd.c 3.0 87/07/06 2. */ 3. /* NetHack may be freely redistributed. See license for details. */ 4. 5. #include "hack.h" 6. 7. #if defined(LINT) && defined(UNIX) /* rand() is long... */ 8. extern int rand(); 9. #define RND(x) (rand() % x) 10. #else /* LINT */ 11. /* rand() is either random() or lrand48() - see config.h. */ 12. #ifdef UNIX 13. #define RND(x) (int)(Rand() % (long)(x)) 14. #else 15. /* Good luck: the bottom order bits are cyclic. */ 16. #define RND(x) (int)((Rand()>>3) % (x)) 17. #endif 18. #endif /* LINT */ 19. 20. int 21. rn1(x,y) /* y <= rn1(x,y) < (y+x) */ 22. register int x, y; 23. { 24. return(RND(x)+y); 25. } 26. 27. int 28. rn2(x) /* 0 <= rn2(x) < x */ 29. register int x; 30. { 31. return(RND(x)); 32. } 33. 34. int 35. rnl(x) /* 0 <= rnl(x) < x; somtimes subtracting Luck */ 36. register x; /* good luck approaches 0, bad luck approaches (x-1) */ 37. { 38. register int i = RND(x); 39. 40. if (Luck && rn2(50 - Luck)) { 41. i -= (x <= 15 && Luck >= -5 ? Luck/3 : Luck); 42. if (i < 0) i = 0; 43. else if (i >= x) i = x-1; 44. } 45. 46. return i; 47. } 48. 49. int 50. rnd(x) /* 1 <= rnd(x) <= x */ 51. register int x; 52. { 53. return(RND(x)+1); 54. } 55. 56. int 57. d(n,x) /* n <= d(n,x) <= (n*x) */ 58. register int n, x; 59. { 60. register int tmp = n; 61. 62. while(n--) tmp += RND(x); 63. return(tmp); 64. } 65. 66. int 67. rne(x) /* by stewr 870807 */ 68. register int x; 69. { 70. register int tmp = 1; 71. while(!rn2(x)) tmp++; 72. return(tmp); 73. } 74. 75. #ifdef THEOLOGY 76. int 77. rnz(i) 78. int i; 79. { 80. # ifdef LINT 81. int x = i; 82. int tmp = 1000; 83. # else 84. register long x = i; 85. register long tmp = 1000; 86. # endif 87. tmp += rn2(1000); 88. tmp *= rne(4); 89. if (rn2(2)) { x *= tmp; x /= 1000; } 90. else { x *= 1000; x /= tmp; } 91. return((int)x); 92. } 93. #endif