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#include <resolv.h> int __dn_expand(const unsigned char *base, const unsigned char *end, const unsigned char *src, char *dest, int space) { const unsigned char *p = src; char *dend, *dbegin = dest; int len = -1, i, j; if (p==end || space <= 0) return -1; dend = dest + (space > 254 ? 254 : space); /* detect reference loop using an iteration counter */ for (i=0; i < end-base; i+=2) { /* loop invariants: p<end, dest<dend */ if (*p & 0xc0) { if (p+1==end) return -1; j = ((p[0] & 0x3f) << 8) | p[1]; if (len < 0) len = p+2-src; if (j >= end-base) return -1; p = base+j; } else if (*p) { if (dest != dbegin) *dest++ = '.'; j = *p++; if (j >= end-p || j >= dend-dest) return -1; while (j--) *dest++ = *p++; } else { *dest = 0; if (len < 0) len = p+1-src; return len; } } return -1; } weak_alias(__dn_expand, dn_expand); |