1 /* 2 * Copyright (c) 1988 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Guy Harris. 7 * 8 * %sccs.include.redist.c% 9 */ 10 11 #ifndef lint 12 char copyright[] = 13 "@(#) Copyright (c) 1988 The Regents of the University of California.\n\ 14 All rights reserved.\n"; 15 #endif /* not lint */ 16 17 #ifndef lint 18 static char sccsid[] = "@(#)ching.cno.c 5.3 (Berkeley) 06/01/90"; 19 #endif /* not lint */ 20 21 /* 22 * cno - Read a question, cast a change, and output the line values to the 23 * standard output for processing by "phx". 24 */ 25 #include <stdio.h> 26 #include "ching.h" 27 28 long now; /* current time */ 29 30 unsigned seed; /* seed for random number generator */ 31 unsigned getrand(); 32 33 char *change(); 34 char string[6+1]; /* where the actual change string is put */ 35 36 int table[2][2][2] = { 37 { { OYIN, YYANG,}, { YYANG, YYIN,} }, 38 { { YYANG, YYIN,}, { YYIN, OYANG,} }, 39 }; 40 41 main() 42 { 43 FILE *logf; 44 45 time(&now); 46 seed = (int)now + getquest() + getgid() + getuid() + getpid(); /* randomize */ 47 printf("%s\n", change()); 48 } 49 50 /* 51 * Hash the question by adding all the characters together. 52 */ 53 int 54 getquest() 55 { 56 int result; 57 register int c; 58 59 result = 0; 60 while ((c = getchar()) != EOF) 61 result += c; 62 return(result); 63 } 64 65 /* 66 * Get a set of six lines making up a change. 67 */ 68 char * 69 change() 70 { 71 register int i; 72 73 for (i = 0; i < 6; i++) 74 string[i] = table[getrnum()&01][getrnum()&01][getrnum()&01] + '0'; 75 string[i] = '\0'; 76 return(string); 77 } 78 79 /* 80 * Get a number more random than what getrand() gives. 81 */ 82 getrnum() 83 { 84 return((getrand())>>(getrand()%17)); 85 } 86 87 /* 88 * Get a random number. 89 */ 90 unsigned 91 getrand() 92 { 93 return(seed = (seed*13077) + 6925); 94 } 95