ref: 30d7ba73ff01b66e88e28faa260583935a20c1d7
dir: /iching.c/
#include <u.h> #include <libc.h> void main() { int fd; int i, j; uchar bits[3]; int lines[6]; int linesproc[6]; long value; uchar table[64] = { 2, 23, 8, 20, 16, 35, 45, 12, 15, 52, 39, 53, 62, 56, 31, 33, 7, 4, 29, 59, 40, 64, 47, 6, 46, 18, 48, 57, 32, 50, 28, 44, 24, 27, 3, 42, 51, 21, 17, 25, 36, 22, 63, 37, 55, 30, 49, 13, 19, 41, 60, 61, 54, 38, 58, 10, 11, 26, 5, 9, 34, 14, 43, 1 }; Rune first; Rune changed; fd = open("/dev/random", OREAD); if (fd < 0) sysfatal("open"); value = 0; for (i = 0; i < 6; i++) { if (readn(fd, bits, 3) != 3) sysfatal("read"); lines[i] = 0; for (j = 0; j < 3; j++) lines[i] += bits[j] & 1? 2: 3; print("%d ", lines[i]); linesproc[i] = lines[i] & 1; value += linesproc[i] == 1? 1 << (5 - i): 0; } print("\n"); value = 0x4DC0 - 1 + table[value]; first = value; value = 0; for (i = 0; i < 6; i++) { if ((lines[i] % 3) == 0) linesproc[i] = linesproc[i] == 1? 0: 1; value += linesproc[i] == 1? 1 << (5 - i): 0; } value = 0x4DC0 - 1 + table[value]; changed = value; print("%C %C\n", first, changed); }