root/test-genrandom.c

DEFINITIONS

1. main

/*
 * Simple random data generator used to create reproducible test files.
 * This is inspired from POSIX.1-2001 implementation example for rand().
 * Copyright (C) 2007 by Nicolas Pitre, licensed under the GPL version 2.
 */

#include "git-compat-util.h"

int main(int argc, char *argv[])
{
        unsigned long count, next = 0;
        unsigned char *c;

        if (argc < 2 || argc > 3) {
                fprintf(stderr, "usage: %s <seed_string> [<size>]\n", argv[0]);
                return 1;
        }

        c = (unsigned char *) argv[1];
        do {
                next = next * 11 + *c;
        } while (*c++);

        count = (argc == 3) ? strtoul(argv[2], NULL, 0) : -1L;

        while (count--) {
                next = next * 1103515245 + 12345;
                if (putchar((next >> 16) & 0xff) == EOF)
                        return -1;
        }

        return 0;
}