int main(int argc, const char **argv)
{
assert(argc == 1 || argc == 3);
if (argc == 3)
return setcmp(argv[1], argv[2]);
int rc = 0;
char *line = NULL;
size_t alloc_size = 0;
ssize_t len;
while ((len = getline(&line, &alloc_size, stdin)) >= 0) {
if (len > 0 && line[len-1] == '\n')
line[--len] = '\0';
if (len == 0)
continue;
char *s1 = line;
char *s2 = strchr(line, ' ');
if (s2 == NULL)
s2 = strchr(line, '\t');
assert(s2);
*s2++ = '\0';
rc |= setcmp(s1, s2);
}
free(line);
return rc;
}
static void fine_step_tune(int (*setcmp)(int regval), int regval, int step)
{
/* Registers are not always stable, timeout if best fit not found soon
enough */
unsigned long abort = current_tick + HZ*2;
int flags = 0;
while (TIME_BEFORE(current_tick, abort))
{
int cmp;
regval = regval + step;
cmp = setcmp(regval);
if (cmp == 0)
break;
step = abs(step);
if (cmp < 0)
{
flags |= TOO_SMALL;
if (step == 1)
flags |= APPROACH_UP_1;
}
else
{
step = -step;
flags |= TOO_BIG;
if (step == -1)
step |= APPROACH_DOWN_1;
}
if ((flags & APPROACH_UP_1) && (flags & APPROACH_DOWN_1))
break; /* approached with step=1: best fit value found */
if ((flags & TOO_SMALL) && (flags & TOO_BIG))
{
step /= 2;
if (step == 0)
step = 1;
flags &= ~(TOO_SMALL | TOO_BIG);
}
}
}