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/* Trivia program to corrupt an RDB file in order to check the RDB check
* program behavior and effectiveness.
*
* Copyright (C) 2016 Salvatore Sanfilippo.
* This software is released in the 3-clause BSD license. */
#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
int main(int argc, char **argv) {
struct stat stat;
int fd, cycles;
if (argc != 3) {
fprintf(stderr,"Usage: <filename> <cycles>\n");
exit(1);
}
srand(time(NULL));
char *filename = argv[1];
cycles = atoi(argv[2]);
fd = open(filename,O_RDWR);
if (fd == -1) {
perror("open");
exit(1);
}
fstat(fd,&stat);
while(cycles--) {
unsigned char buf[32];
unsigned long offset = rand()%stat.st_size;
int writelen = 1+rand()%31;
int j;
for (j = 0; j < writelen; j++) buf[j] = (char)rand();
lseek(fd,offset,SEEK_SET);
printf("Writing %d bytes at offset %lu\n", writelen, offset);
write(fd,buf,writelen);
}
return 0;
}
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