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collapseos/tools/memdump.c
Virgil Dupras c2b507eaff tools: improve usability on OpenBSD
So far, I hadn't managed to run those tools properly on OpenBSD. I
was too confused by its stty peculiarities. I'm still confused, but
at least I managed to make them work... most of the time...
2020-07-02 11:36:53 -04:00

49 lines
1.2 KiB
C

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include "common.h"
/* Read specified number of bytes at specified memory address through a Forth
* remote shell and dump it to stdout.
*/
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 = ttyopen(argv[1]);
if (fd < 0) {
fprintf(stderr, "Could not open %s\n", argv[1]);
return 1;
}
char s[0x30];
sprintf(s, ": _ 0x%04x 0x%04x DO I @ .x LOOP ; _", memptr+bytecount, memptr);
sendcmd(fd, s);
for (int i=0; i<bytecount; i++) {
mread(fd, s, 2); // read hex pair
s[2] = 0; // null terminate
unsigned char c = strtol(s, NULL, 16);
putchar(c);
}
readprompt(fd);
sendcmdp(fd, "FORGET _");
return 0;
}