3 int __dn_expand(const unsigned char *base, const unsigned char *end, const unsigned char *src, char *dest, int space)
5 const unsigned char *p = src;
6 char *dend, *dbegin = dest;
8 if (p==end || space <= 0) return -1;
9 dend = dest + (space > 254 ? 254 : space);
10 /* detect reference loop using an iteration counter */
11 for (i=0; i < end-base; i+=2) {
12 /* loop invariants: p<end, dest<dend */
14 if (p+1==end) return -1;
15 j = ((p[0] & 0x3f) << 8) | p[1];
16 if (len < 0) len = p+2-src;
17 if (j >= end-base) return -1;
20 if (dest != dbegin) *dest++ = '.';
22 if (j >= end-p || j >= dend-dest) return -1;
23 while (j--) *dest++ = *p++;
26 if (len < 0) len = p+1-src;
33 weak_alias(__dn_expand, dn_expand);