/src/ares/ares_expand_string.c
http://github.com/joyent/libuv · C · 75 lines · 43 code · 13 blank · 19 comment · 5 complexity · 80a2206659ff370cd33d77c6bd150191 MD5 · raw file
- /* 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;
- union {
- ssize_t sig;
- size_t uns;
- } elen;
- if (encoded == abuf+alen)
- return ARES_EBADSTR;
- elen.uns = *encoded;
- if (encoded+elen.sig+1 > abuf+alen)
- return ARES_EBADSTR;
- encoded++;
- *s = malloc(elen.uns+1);
- if (*s == NULL)
- return ARES_ENOMEM;
- q = *s;
- strncpy((char *)q, (char *)encoded, elen.uns);
- q[elen.uns] = '\0';
- *s = q;
- *enclen = (long)(elen.sig+1);
- return ARES_SUCCESS;
- }