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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);
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