/* $Id: ares_expand_string.c,v 1.10 2009-11-02 11:55:53 yangtse Exp $ */ /* 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 "ares_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; }