64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
/* Read specified number of bytes at specified memory address through a BASIC
|
|
* remote shell and dump it to stdout.
|
|
*/
|
|
|
|
void sendcmd(int fd, char *cmd)
|
|
{
|
|
char junk[2];
|
|
while (*cmd) {
|
|
write(fd, cmd, 1);
|
|
read(fd, &junk, 1);
|
|
cmd++;
|
|
// The other side is sometimes much slower than us and if we don't let
|
|
// it breathe, it can choke.
|
|
usleep(1000);
|
|
}
|
|
write(fd, "\n", 1);
|
|
read(fd, &junk, 2); // sends back \r\n
|
|
usleep(1000);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
if (argc != 4) {
|
|
fprintf(stderr, "Usage: ./memdump device memptr bytecount\n");
|
|
return 1;
|
|
}
|
|
unsigned int memptr = strtol(argv[2], NULL, 16);
|
|
unsigned int bytecount = strtol(argv[3], NULL, 16);
|
|
fprintf(stderr, "memptr: 0x%04x bytecount: 0x%04x.\n", memptr, bytecount);
|
|
if (memptr+bytecount > 0xffff) {
|
|
fprintf(stderr, "memptr+bytecount out of range.\n");
|
|
return 1;
|
|
}
|
|
if (!bytecount) {
|
|
// nothing to spit
|
|
return 0;
|
|
}
|
|
|
|
int fd = open(argv[1], O_RDWR|O_NOCTTY);
|
|
char s[0x20];
|
|
sprintf(s, "m=0x%04x", memptr);
|
|
sendcmd(fd, s);
|
|
read(fd, s, 2); // read prompt
|
|
|
|
for (int i=0; i<bytecount; i++) {
|
|
sendcmd(fd, "peek m");
|
|
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
|
|
sendcmd(fd, "m=m+1");
|
|
read(fd, s, 2); // read prompt
|
|
}
|
|
return 0;
|
|
}
|