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- /* $Id$ */
- /* Copyright 1998 by the Massachusetts Institute of Technology.
- *
- * Permission to use, copy, modify, and distribute this
- * software and its documentation for any purpose and without
- * fee is hereby granted, provided that the above copyright
- * notice appear in all copies and that both that copyright
- * notice and this permission notice appear in supporting
- * documentation, and that the name of M.I.T. not be used in
- * advertising or publicity pertaining to distribution of the
- * software without specific, written prior permission.
- * M.I.T. makes no representations about the suitability of
- * this software for any purpose. It is provided "as is"
- * without express or implied warranty.
- */
- #include "setup.h"
- #ifdef HAVE_SYS_SOCKET_H
- # include <sys/socket.h>
- #endif
- #ifdef HAVE_NETINET_IN_H
- # include <netinet/in.h>
- #endif
- #ifdef HAVE_ARPA_NAMESER_H
- # include <arpa/nameser.h>
- #else
- # include "nameser.h"
- #endif
- #include <string.h>
- #include <stdlib.h>
- #include "ares.h"
- #include "ares_private.h" /* for the memdebug */
- /* Simply decodes a length-encoded character string. The first byte of the
- * input is the length of the string to be returned and the bytes thereafter
- * are the characters of the string. The returned result will be NULL
- * terminated.
- */
- int ares_expand_string(const unsigned char *encoded,
- const unsigned char *abuf,
- int alen,
- unsigned char **s,
- long *enclen)
- {
- unsigned char *q;
- long len;
- if (encoded == abuf+alen)
- return ARES_EBADSTR;
- len = *encoded;
- if (encoded+len+1 > abuf+alen)
- return ARES_EBADSTR;
- encoded++;
- *s = malloc(len+1);
- if (*s == NULL)
- return ARES_ENOMEM;
- q = *s;
- strncpy((char *)q, (char *)encoded, len);
- q[len] = '\0';
- *s = q;
- *enclen = len+1;
- return ARES_SUCCESS;
- }
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