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