int main()

in zlib/contrib/puff/pufftest.c [92:169]
70 lines of code
20 McCabe index (conditional complexity)

int main(int argc, char **argv)
{
    int ret, put = 0, fail = 0;
    unsigned skip = 0;
    char *arg, *name = NULL;
    unsigned char *source = NULL, *dest;
    size_t len = 0;
    unsigned long sourcelen, destlen;

    /* process arguments */
    while (arg = *++argv, --argc)
        if (arg[0] == '-') {
            if (arg[1] == 'w' && arg[2] == 0)
                put = 1;
            else if (arg[1] == 'f' && arg[2] == 0)
                fail = 1, put = 1;
            else if (arg[1] >= '0' && arg[1] <= '9')
                skip = (unsigned)atoi(arg + 1);
            else {
                fprintf(stderr, "invalid option %s\n", arg);
                return 3;
            }
        }
        else if (name != NULL) {
            fprintf(stderr, "only one file name allowed\n");
            return 3;
        }
        else
            name = arg;
    source = load(name, &len);
    if (source == NULL) {
        fprintf(stderr, "memory allocation failure\n");
        return 4;
    }
    if (len == 0) {
        fprintf(stderr, "could not read %s, or it was empty\n",
                name == NULL ? "<stdin>" : name);
        free(source);
        return 3;
    }
    if (skip >= len) {
        fprintf(stderr, "skip request of %d leaves no input\n", skip);
        free(source);
        return 3;
    }

    /* test inflate data with offset skip */
    len -= skip;
    sourcelen = (unsigned long)len;
    ret = puff(NIL, &destlen, source + skip, &sourcelen);
    if (ret)
        fprintf(stderr, "puff() failed with return code %d\n", ret);
    else {
        fprintf(stderr, "puff() succeeded uncompressing %lu bytes\n", destlen);
        if (sourcelen < len) fprintf(stderr, "%lu compressed bytes unused\n",
                                     len - sourcelen);
    }

    /* if requested, inflate again and write decompressed data to stdout */
    if (put && ret == 0) {
        if (fail)
            destlen >>= 1;
        dest = malloc(destlen);
        if (dest == NULL) {
            fprintf(stderr, "memory allocation failure\n");
            free(source);
            return 4;
        }
        puff(dest, &destlen, source + skip, &sourcelen);
        SET_BINARY_MODE(stdout);
        fwrite(dest, 1, destlen, stdout);
        free(dest);
    }

    /* clean up */
    free(source);
    return ret;
}