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authorAnas Nashif <anas.nashif@intel.com>2012-10-30 20:54:38 (GMT)
committerAnas Nashif <anas.nashif@intel.com>2012-10-30 20:54:38 (GMT)
commitb8e6c26b7b9608dffc84645f17fe4cf534af18dd (patch)
tree61d9fff2984aa043471a1c305cfc4c76d7a099fb /ares_expand_string.c
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Imported Upstream version 1.7.5upstream/1.7.5
Diffstat (limited to 'ares_expand_string.c')
-rw-r--r--ares_expand_string.c75
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diff --git a/ares_expand_string.c b/ares_expand_string.c
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+
+/* 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;
+}
+