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author | Anas Nashif <anas.nashif@intel.com> | 2012-10-30 13:54:38 -0700 |
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committer | Anas Nashif <anas.nashif@intel.com> | 2012-10-30 13:54:38 -0700 |
commit | b8e6c26b7b9608dffc84645f17fe4cf534af18dd (patch) | |
tree | 61d9fff2984aa043471a1c305cfc4c76d7a099fb /ares_expand_string.c | |
download | c-ares-b8e6c26b7b9608dffc84645f17fe4cf534af18dd.tar.gz c-ares-b8e6c26b7b9608dffc84645f17fe4cf534af18dd.tar.bz2 c-ares-b8e6c26b7b9608dffc84645f17fe4cf534af18dd.zip |
Imported Upstream version 1.7.5upstream/1.7.5
Diffstat (limited to 'ares_expand_string.c')
-rw-r--r-- | ares_expand_string.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/ares_expand_string.c b/ares_expand_string.c new file mode 100644 index 0000000..f24cccf --- /dev/null +++ b/ares_expand_string.c @@ -0,0 +1,75 @@ + +/* 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; +} + |