On Tue, Aug 25, 2015 at 01:09:27PM +0100, Rainer Weikusat wrote:
> "tilt!" <tilt@???> writes:
>
> > Hi Edward,
> >
> > On 08/25/2015 12:51 PM, Edward Bartolo wrote:
> >> [...]
> >
> > Please accept merge request #1 "cleanup of backend binaries".
>
> Two random remarks:
>
> ,----
> | size_t essid_safe_strlen(uint8_t * bytes)
> | {
> | size_t result;
> |
> | if(!bytes)
> | return 0;
> |
> | result = 0;
> |
> | while(*bytes != 0) {
> | bytes++;
> | result++;
> | }
> |
> | return result;
> | }
> `----
>
> A C string of length 0 is just a "\000". A NULL pointer is not a string.
> Reimplementing strlen is - apart from that - a rather bizarre idea. A
> usual implementation would look somewhat like this:
>
> size_t strlen(char *s)
> {
> char *r;
>
> r = s;
> while (*r) ++r;
> return r - s;
> }
>
> ie, it's not necessary to maintain a separate byte counter.
>
> ,----
> | uint8_t essid_allowed_chars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-";
> |
> | [...]
> |
> | int essid_allowed_char(uint8_t c) {
> | size_t i;
> | size_t k;
> |
> | int rv;
> |
> | rv = 0;
> |
> | k = essid_safe_strlen(essid_allowed_chars);
> |
> | for (i=0; i<k; i++)
> | if(c==essid_allowed_chars[i]) {
> | rv = 1;
> |
> | break;
> | }
> |
> | return rv;
> | }
> `----
>
> A more sensible simple way to implement this would be
>
> char *essid_allowed_chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-";
>
> int essid_allowed_char(int c)
> {
> return strchr(essid_allowed_chars, c) != NULL;
> }
>
> Considering that this enforces some kind of 'bastard URL-encoding'
> (using + as prefix instead of %) for all other bytes, it's also going
> make people who believe that UTF-8 would be a well supported way to
> represent non-ASCII characters very unhappy.
The Korean encoding before UTF-8 used two-byte characters. Sone of
those characters contained zero bytes as parts of a two-byte nonzero
encoding.
I had to use environment-dependent string copying to get that one right.
-- hendrik
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Re: [DNG] netman GIT project
