source: asp3_tinet_ecnl_rx/trunk/musl-1.1.18/src/network/dn_expand.c@ 337

#include <resolv.h>
#include "libc.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);