collapseos/tools/blkdump.c

38 lines
850 B
C
Raw Normal View History

2019-12-10 10:33:29 -05:00
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include "common.h"
/* Read specified number of bytes in active blkdev at active offset.
*/
int main(int argc, char **argv)
{
if (argc != 3) {
fprintf(stderr, "Usage: ./memdump device bytecount\n");
return 1;
}
unsigned int bytecount = strtol(argv[2], NULL, 16);
if (!bytecount) {
// nothing to spit
return 0;
}
int fd = open(argv[1], O_RDWR|O_NOCTTY);
char s[3];
for (int i=0; i<bytecount; i++) {
sendcmd(fd, "getb");
read(fd, s, 2); // read prompt
sendcmd(fd, "puth a");
read(fd, s, 2); // read hex pair
s[2] = 0; // null terminate
unsigned char c = strtol(s, NULL, 16);
putchar(c);
read(fd, s, 2); // read prompt
}
return 0;
}