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Annotation of coherent/d/usr/src/examples/fseek.c, revision 1.1

1.1     ! root        1: #include <stdio.h>
        !             2: 
        !             3: extern long atol();
        !             4: void fatal();
        !             5: 
        !             6: main(argc, argv)
        !             7: int argc; char *argv[];
        !             8: {
        !             9:        register FILE *ifp;
        !            10:        register int c;
        !            11:        long nchars, size;
        !            12: 
        !            13:        if (argc < 2 || argc > 3)
        !            14:                fatal("Usage: fseek file [ nchars ]");
        !            15:        nchars = (argc == 3) ? atol(argv[2]) : 100L;
        !            16:        if ((ifp = fopen(argv[1], "r")) == NULL)
        !            17:                fatal("cannot open input file");
        !            18:        /* Seek to end */
        !            19:        if (fseek(ifp, 0L, 2) == -1)
        !            20:                fatal("seek error");
        !            21:        /* Find current size */
        !            22:        size = ftell(ifp);
        !            23:        size = (size < nchars) ? 0L : size - nchars;
        !            24: 
        !            25:        /* Seek to point */
        !            26:        if (fseek(ifp, size, 0) == -1)
        !            27:                fatal("seek error");
        !            28:        while ((c = getc(ifp)) != EOF)
        !            29:                /* Copy rest to stdout */
        !            30:                putchar(c);
        !            31:        if (fclose(ifp) == EOF)
        !            32:                fatal("cannot close");
        !            33:        exit(0);
        !            34: }
        !            35: 
        !            36: void fatal(message)
        !            37: char *message;
        !            38: {
        !            39:        fprintf(stderr, "fseek: %s\n", message);
        !            40:        exit(1);
        !            41: }
        !            42: 

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