#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define BUF_SIZE 1024
#define DAT_SIZE (1024*1024*100)

int main(int argc, char *argv[])
{
	FILE *fp;
	int i, remain, ret;
	char buf[BUF_SIZE];
	
	if (argc < 2) {
		fprintf(stderr, "usage: ./testdata [FILENAME]\n");
		return 0;
	}
	
	srand(time(NULL));
	if ((fp = fopen(argv[1], "wb")) == NULL) {
		goto ERROR;
	}
	
	remain = DAT_SIZE;
	while (remain > 0) {
		for(i=0;i<BUF_SIZE;i++){
			buf[i] = (unsigned char)(rand() % 256);
		}
		ret = fwrite(buf, sizeof(char), BUF_SIZE, fp);
		if (ret < BUF_SIZE) goto ERROR;
		remain -= BUF_SIZE;
		printf("remain: %9d\r", remain);
	}
	
	printf("testdata complete!!\n");
	return 0;
	
	ERROR:
	fprintf(stderr, "testdata failed!!\n");
	return -1;
}