76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/* fortune - hand out Chinese fortune cookies Author: Bert Reuling */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#define COOKIEJAR "/usr/lib/fortune.dat"
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static char *Copyright = "\0Copyright (c) 1990 Bert Reuling";
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static unsigned long seed;
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_PROTOTYPE(int main, (int argc, char **argv));
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_PROTOTYPE(unsigned long magic, (unsigned long range));
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int main(argc, argv)
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int argc;
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char *argv[];
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{
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int c1, c2, c3;
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struct stat cookie_stat;
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FILE *cookie;
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if ((cookie = fopen(COOKIEJAR, "r")) == NULL) {
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printf("\nSome things better stay closed.\n - %s\n", argv[0]);
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exit (-1);
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}
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/* Create seed from : date, time, user-id and process-id. we can't get
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* the position of the moon, unfortunately.
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*/
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seed = time( (time_t *) 0) ^ (long) getuid() ^ (long) getpid();
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if (stat(COOKIEJAR, &cookie_stat) != 0) {
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printf("\nIt furthers one to see the super guru.\n - %s\n", argv[0]);
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exit (-1);
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}
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fseek(cookie, magic((unsigned long) cookie_stat.st_size), 0); /* m ove bu magic... */
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c2 = c3 = '\n';
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while (((c1 = getc(cookie)) != EOF) && ((c1 != '%') || (c2 != '%') || (c3 != '\n'))) {
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c3 = c2;
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c2 = c1;
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}
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if (c1 == EOF) {
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printf("\nSomething unexpected has happened.\n - %s", argv[0]);
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exit (-1);
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}
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c2 = c3 = '\n';
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while (((c1 = getc(cookie)) != '%') || (c2 != '%') || (c3 != '\n')) {
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if (c1 == EOF) {
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rewind(cookie);
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continue;
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}
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putc(c2, stdout);
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c3 = c2;
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c2 = c1;
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}
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putc('\n', stdout);
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fclose(cookie);
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return (0);
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}
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/* magic - please study carefull: there is more than meets the eye */
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unsigned long magic(range)
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unsigned long range;
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{
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seed = 9065531L * (seed % 9065533L) - 2 * (seed / 9065531L) + 1L;
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return (seed % range);
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}
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