Function do_diff

util/msrtool/msrtool.c:188–252

}

int do_diff(const char *difffn) {
	char tmpfn[20], line[512], *m1start, *m2start;
	size_t len;
	int ret = 1, tmp, m1pos, sys_opened = 0;
	FILE *fin = NULL, *fout = stdout;
	uint8_t rev = 0;
	uint32_t addr, linenum;
	struct msr m1 = MSR1(0), m2 = MSR1(0);

	if (':' == difffn[0]) {
		rev = 1;
		++difffn;
	}
	if (0 == strcmp(difffn, "-"))
		fin = stdin;
	else if (NULL == (fin = fopen(difffn, "r"))) {
		perror("fopen()");
		return 1;
	}

	for (linenum = 1; NULL != fgets(line, sizeof(line), fin); ++linenum) {
		tmp = strncmp("0x", line, 2) ? 0 : 2;
		if (sscanf(line + tmp, "%8x %n%*x", &addr, &m1pos) < 1)
			continue;
		m1start = line + tmp + m1pos;
		for (len = strlen(m1start) - 1; NULL != strchr("\r\n", m1start[len]); --len)
			m1start[len] = 0;
		if (!str2msr(m1start, &m1, &m2start)) {
			fprintf(stderr, "%s:%d: invalid MSR1 value '%s'\n", difffn, linenum, m1start);
			continue;
		}
		while (' ' == *m2start)
			++m2start;
		if (!str2msr(m2start, &m2, NULL)) {
			fprintf(stderr, "%s:%d: invalid MSR2 value '%s' - reading from hardware!\n", difffn, linenum, m2start);
			if (!sys_opened) {
				if (!found_system())
					goto done;
				sys_opened = sys->open(cpu, SYS_RDONLY);
				if (!sys_opened)
					goto done;
			}
			if (!sys->rdmsr(cpu, addr, &m2))
				goto done;
		}
		if (diff_msr(fout, addr, rev ? m2 : m1, rev ? m1 : m2))
			fprintf(fout, "\n");
	}
	if (!feof(fin))
		fprintf(stderr, "%s:%d: fgets: %s\n", difffn, linenum, strerror(errno));
	else
		ret = 0;
done:
	if (sys_opened)
		sys->close(cpu);
	if (strcmp(difffn, "-")) {
		if (ret)
			unlink(tmpfn);