Johannes Schindelin [off-list ref] writes:
Yes (modulo doing "greater than" comparison on pointers which is IIRC not
permitted in C in general).
Of course, people write a loop like this
char *cp, *ep = strchr(string, '\n');
for (cp = string; cp < ep; cp++)
...
all the time, and forbidding pointer comparison would make the
language impossible to use ;-)
I think you are confused with a different rule---what is not kosher
is to compare two pointers that do not point into elements of the
same array. Whether the comparison is done in (ptr1 < ptr2) way, or
(ptr2 - ptr1 < 0) way, does not change the equation.