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<span style="font-size: 10pt"><a href="/plan9/">Plan 9 from Bell Labs</a>&rsquo;s /usr/web/sources/contrib/fst/jabwock.c</span></p>
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Copyright © 2009 Alcatel-Lucent.<br />
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/*
* jabberwocky - a password suggester
*/
#include &lt;u.h&gt;
#include &lt;libc.h&gt;

static char *sets[] = {
       ['C'] "BCDFGHJKLMNPQRSTVWXYZ",
       ['V'] "AEIOU",
       ['c'] "bcdfghjklmnpqrstvwxyz",
       ['v'] "aeiou",
       ['n'] "0123456789",
       ['%'] "!@#$%^&amp;*()-+_~|{}[]/&lt;&gt;:;'\"\\=",
};

char *
genpat(void)
{
       int i, len;
       char *pat, *p;

       len = rand()%12;
       len = (len &lt; 8) ? 8 : len;
       pat = malloc(len+1);
       if (! pat) return nil;

       for (i = 0, p = pat; i &lt; len; i++, p++)
               *p = "CVcvn%"[(rand()%6)];

       *p = 0;
       return pat;
}

char *
jabberwocky(char *pat)
{
       char *p;
       char *w, *jab;

       jab = malloc(strlen(pat)+1);

       for (p = pat, w = jab; p &amp;&amp; *p &amp;&amp; w; p++) {
               if (strchr("CVcnv%", *p))
                       *w++ = sets[*p][rand()%strlen(sets[*p])];
       }
       *w = 0;
       return jab;
}

void
usage(void)
{
       print("%s [pattern]\npattern ::= {'C' | 'V' | 'c' | 'v' | 'n' | '%%' } | pattern\n", argv0);
}

main(int argc, char **argv)
{
       char *jab;

       srand(time(0)+getpid());

       argv0 = argv[0];
       ARGBEGIN{
       case 'h':
               usage();
               exits("");
       default:
               break;
       }ARGEND;

       if (argc == 0)
               print("%s\n", jabberwocky(genpat()));
       else
               do {
                       jab = jabberwocky(*argv);
                       print("%s\n", jab);
                       free(jab);
                       argc--;
                       argv++;
               } while (argc);

       exits(nil);
}
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