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Annotation of coherent/d/usr/games/fortune.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Display a random line on a file. Suitable for automated
        !             3:  * fortune cookies. Multi line fortunes such as poems should
        !             4:  * have their lines separated by @'s.
        !             5:  */
        !             6: #include <sys/timeb.h>
        !             7: #include <stdio.h>
        !             8: #define RAND_MAX 32767
        !             9: 
        !            10: char *fortfile = "/usr/games/lib/fortunes";
        !            11: 
        !            12: void
        !            13: main(argc, argv)
        !            14: char *argv[];
        !            15: {
        !            16:        FILE  *ifp;
        !            17:        double  randomAdj;
        !            18:        int c;
        !            19:        struct timeb tb;
        !            20: 
        !            21:        if(argc > 1)
        !            22:                fortfile = argv[1];
        !            23: 
        !            24:        if(NULL == (ifp = fopen(fortfile, "r"))) {
        !            25:                printf("Cannot open %s\n", fortfile);
        !            26:                exit(1);
        !            27:        }
        !            28: 
        !            29:        fseek(ifp, 0L, 2);
        !            30:        randomAdj = (double)ftell(ifp) / ((double)RAND_MAX);
        !            31: 
        !            32:        ftime(&tb);
        !            33:        srand((unsigned int)(tb.time ^ tb.millitm));
        !            34:        /* a user running this several times in quick succession will
        !            35:         * be dissapointed if he keeps getting the same result.
        !            36:         * Running rand() 100 times distributes the low order bit
        !            37:         * changes in the seed to the high half returned by rand().
        !            38:         */
        !            39:        for(c = 0; c < 100; c++)
        !            40:                rand();
        !            41: 
        !            42:        fseek(ifp, (long)(randomAdj * (double)rand()), 0);
        !            43:        while('\n' != (c = fgetc(ifp)) && EOF != c)
        !            44:                ;
        !            45: 
        !            46:        if(c == EOF) {
        !            47:                printf("File does not end with nl\n");
        !            48:                exit(1);
        !            49:        }
        !            50:                
        !            51:        while('\n' != (c = fgetc(ifp))) {
        !            52:                if(EOF == c) {
        !            53:                        fseek(ifp, 0L, 0);
        !            54:                        continue;
        !            55:                }
        !            56:                if('@' == c) /* to display multi line fortunes */
        !            57:                        c = '\n';
        !            58:                putchar(c);
        !            59:        }
        !            60:        putchar('\n');
        !            61: }

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