blob: 39dbc928d5d68e48f34c6b74bfadc4eeeb636d35 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <stdint.h>
#include <sysexits.h>
static struct {
int n;
int *cs;
} patterns[256] = {0};
static uint32_t hash(char *s) {
unsigned int h = 0x811c9dc5;
for (size_t i = 0; s[i] != '\0'; i++) {
h *= 0x01000193;
h = h ^ s[i];
}
return h;
}
int main(int argc, char *argv[]) {
if (argc > 1) {
if (argc > 2) {
fprintf(stderr, "usage: %s [seed]\n", argv[0]);
return EX_USAGE;
}
srand(hash(argv[1]));
} else srand(time(NULL));
int c;
int prev = getchar();
int p = prev;
while (prev != EOF) {
c = getchar();
prev = (unsigned char) prev;
patterns[prev].n++;
patterns[prev].cs =
realloc(patterns[prev].cs, patterns[prev].n * sizeof(int));
if (!patterns[prev].cs) perror(argv[0]);
patterns[prev].cs[patterns[prev].n - 1] = c;
prev = c;
}
while (p != EOF && patterns[p].n != 0) {
p = (unsigned char) p;
putchar(p);
p = patterns[p].cs[rand() % patterns[p].n];
}
return 0;
}
|
