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#include <u.h>
#include <libc.h>
void
erase(char *part)
{
char file[256];
int fd;
snprint(file, sizeof file, "%sctl", part);
fd = open(file, ORDWR);
if(fd < 0)
return;
fprint(fd, "erase");
close(fd);
}
char*
readfile(char *file)
{
char buf[512];
int n, fd;
uchar *p;
fd = open(file, OREAD);
if(fd < 0)
sysfatal("opening %s: %r", file);
n = read(fd, buf, sizeof(buf)-1);
close(fd);
if(n < 0)
return "";
buf[n] = 0;
for(p = (uchar*)buf; *p; p++)
if(*p == 0xff){
*p = 0;
break;
}
return strdup(buf);
}
void
writefile(char *file, char *data)
{
int fd;
fd = open(file, OWRITE);
if(fd < 0)
fd = create(file, OWRITE, 0664);
if(fd < 0)
return;
write(fd, data, strlen(data));
close(fd);
}
void
main(int argc, char **argv)
{
int from = 0;
char *params;
char *file = "/tmp/tmpparams";
char *part;
ARGBEGIN {
case 'f':
from++;
break;
} ARGEND;
if(argc)
part = argv[0];
else
part = "/dev/flash/user";
if(from){
params = readfile(part);
writefile(file, params);
} else {
params = readfile(file);
erase(part);
writefile(part, params);
free(params);
}
}
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