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/* ISC license. */
#include <skalibs/diuint.h>
#include <skalibs/fmtscan.h>
#define px(c) ((j || (c)) ? (*s++ = fmtscan_asc(c), 1) : 0)
static inline size_t xfmt16 (char *s, char const *key)
{
size_t j = 0 ;
j += px((unsigned char)key[0] >> 4) ;
j += px((unsigned char)key[0] & 15) ;
j += px((unsigned char)key[1] >> 4) ;
j += px((unsigned char)key[1] & 15) ;
return j ? j : (*s = '0', 1) ;
}
static inline unsigned int find_colcol (char const *key, unsigned int *pos)
{
diuint z[4] = { DIUINT_ZERO, DIUINT_ZERO, DIUINT_ZERO, DIUINT_ZERO } ;
unsigned int j = 0 ;
unsigned int max = 0 ;
int iszero = 0 ;
unsigned int i = 0 ;
for ( ; i < 8 ; i++)
{
if (key[i<<1] || key[(i<<1)+1])
{
if (iszero)
{
iszero = 0 ;
z[j].right = i - z[j].left ;
if (z[j].right > max) max = z[j].right ;
j++ ;
}
}
else
{
if (!iszero)
{
iszero = 1 ;
z[j].left = i ;
}
}
}
if (iszero)
{
z[j].right = 8 - z[j].left ;
if (z[j].right > max) max = z[j].right ;
j++ ;
}
if (max >= 2)
for (i = 0 ; i < j ; i++) if (z[i].right == max) return (*pos = z[i].left, max) ;
return 0 ;
}
size_t ip6_fmt (char *s, char const *ip6)
{
size_t w = 0 ;
unsigned int pos = 8 ;
unsigned int len = find_colcol(ip6, &pos) ;
unsigned int i = 0 ;
for (; i < 8 ; i++)
{
if (i == pos)
{
if (!i) s[w++] = ':' ;
s[w++] = ':' ;
i += len-1 ;
}
else
{
w += xfmt16(s + w, ip6 + (i<<1)) ;
if (i < 7) s[w++] = ':' ;
}
}
return w ;
}
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