66 строки
1.7 KiB
C
66 строки
1.7 KiB
C
/* 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 <sys/types.h>
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#ifdef WIN32
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#include "nameser.h"
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#else
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#endif
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#include <string.h>
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#include <stdlib.h>
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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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long len;
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if (encoded == abuf+alen)
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return ARES_EBADSTR;
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len = *encoded;
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if (encoded+len+1 > abuf+alen)
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return ARES_EBADSTR;
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encoded++;
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*s = malloc(len+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, len);
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q[len] = '\0';
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*s = q;
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*enclen = len+1;
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return ARES_SUCCESS;
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}
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