On Mon, 2012-09-10 at 08:19 +0200, Jan Engelhardt wrote:
> On Tuesday 2012-08-21 23:29, J. Bruce Fields wrote:
[...]
> >+/*
> >+ * length of the decimal representation of an unsigned integer. Just an
> >+ * approximation, but it's right for types of size 1 to 36 bytes:
> >+ */
> >+#define base10len(i) (sizeof(i) * 24 / 10 + 1)
>
> gcc provides... "interesting" features at times.
>
> /* for unsigned "i"s */
> #define base10len(i) ((const int[]){1,3,5,8,10,13,15,17,20}[i])
Shouldn't that have been
---- snip ----
#define base10len(i) ((const int[]){1,3,5,8,10,13,15,17,20}[sizeof(i)])
---- snip ----
?
A pure K&R-C version would use a string:
---- snip ----
#define base10len(i) "\0x1\0x3\0x5\0x8\0x0A\0x0D\0x0F\0x11\0x14"[sizeof(i)]
---- snip ----
(if I converted them properly into hexadecimal) and that gives a "char"
which is happily promoted to whatever one needs in that place.
Kind regards,
Bernd
--
Bernd Petrovitsch Email : be...@petrovitsch.priv.at
LUGA : http://www.luga.at
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