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