[thirdparty/git.git] / test-genrandom.c

/*
 * 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;
}
Commit	Line	Data
2dca1af4 NP	1	/*
	2	* Simple random data generator used to create reproducible test files.
	3	* This is inspired from POSIX.1-2001 implementation example for rand().
	4	* Copyright (C) 2007 by Nicolas Pitre, licensed under the GPL version 2.
	5	*/
	6
a16753dc	7	#include "git-compat-util.h"
2dca1af4 NP	8
	9	int main(int argc, char *argv[])
	10	{
	11	unsigned long count, next = 0;
	12	unsigned char *c;
	13
	14	if (argc < 2 \|\| argc > 3) {
c2318228	15	fprintf(stderr, "Usage: %s <seed_string> [<size>]\n", argv[0]);
2dca1af4 NP	16	return 1;
	17	}
	18
	19	c = (unsigned char *) argv[1];
	20	do {
	21	next = next * 11 + *c;
	22	} while (*c++);
	23
	24	count = (argc == 3) ? strtoul(argv[2], NULL, 0) : -1L;
	25
	26	while (count--) {
	27	next = next * 1103515245 + 12345;
	28	if (putchar((next >> 16) & 0xff) == EOF)
	29	return -1;
	30	}
	31
	32	return 0;
	33	}