/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8   -*-│
│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8                                   :vi │
╚──────────────────────────────────────────────────────────────────────────────╝
│                                                                              │
│  Musl Libc                                                                   │
│  Copyright © 2005-2014 Rich Felker, et al.                                   │
│                                                                              │
│  Permission is hereby granted, free of charge, to any person obtaining       │
│  a copy of this software and associated documentation files (the             │
│  "Software"), to deal in the Software without restriction, including         │
│  without limitation the rights to use, copy, modify, merge, publish,         │
│  distribute, sublicense, and/or sell copies of the Software, and to          │
│  permit persons to whom the Software is furnished to do so, subject to       │
│  the following conditions:                                                   │
│                                                                              │
│  The above copyright notice and this permission notice shall be              │
│  included in all copies or substantial portions of the Software.             │
│                                                                              │
│  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,             │
│  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF          │
│  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.      │
│  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY        │
│  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,        │
│  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE           │
│  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                      │
│                                                                              │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "third_party/musl/resolv.internal.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_reference(__dn_expand, dn_expand);