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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_data.c
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Imported Upstream version 1.7.5upstream/1.7.5
Diffstat (limited to 'ares_data.c')
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+
+/* Copyright (C) 2009-2010 by Daniel Stenberg
+ *
+ * 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"
+
+#include <stddef.h>
+
+#include "ares.h"
+#include "ares_data.h"
+#include "ares_private.h"
+
+
+/*
+** ares_free_data() - c-ares external API function.
+**
+** This function must be used by the application to free data memory that
+** has been internally allocated by some c-ares function and for which a
+** pointer has already been returned to the calling application. The list
+** of c-ares functions returning pointers that must be free'ed using this
+** function is:
+**
+** ares_get_servers()
+** ares_parse_srv_reply()
+** ares_parse_txt_reply()
+*/
+
+void ares_free_data(void *dataptr)
+{
+ struct ares_data *ptr;
+
+ if (!dataptr)
+ return;
+
+#ifdef __INTEL_COMPILER
+# pragma warning(push)
+# pragma warning(disable:1684)
+ /* 1684: conversion from pointer to same-sized integral type */
+#endif
+
+ ptr = (void *)((char *)dataptr - offsetof(struct ares_data, data));
+
+#ifdef __INTEL_COMPILER
+# pragma warning(pop)
+#endif
+
+ if (ptr->mark != ARES_DATATYPE_MARK)
+ return;
+
+ switch (ptr->type)
+ {
+ case ARES_DATATYPE_MX_REPLY:
+
+ if (ptr->data.mx_reply.next)
+ ares_free_data(ptr->data.mx_reply.next);
+ if (ptr->data.mx_reply.host)
+ free(ptr->data.mx_reply.host);
+ break;
+
+ case ARES_DATATYPE_SRV_REPLY:
+
+ if (ptr->data.srv_reply.next)
+ ares_free_data(ptr->data.srv_reply.next);
+ if (ptr->data.srv_reply.host)
+ free(ptr->data.srv_reply.host);
+ break;
+
+ case ARES_DATATYPE_TXT_REPLY:
+
+ if (ptr->data.txt_reply.next)
+ ares_free_data(ptr->data.txt_reply.next);
+ if (ptr->data.txt_reply.txt)
+ free(ptr->data.txt_reply.txt);
+ break;
+
+ case ARES_DATATYPE_ADDR_NODE:
+
+ if (ptr->data.addr_node.next)
+ ares_free_data(ptr->data.addr_node.next);
+ break;
+
+ default:
+ return;
+ }
+
+ free(ptr);
+}
+
+
+/*
+** ares_malloc_data() - c-ares internal helper function.
+**
+** This function allocates memory for a c-ares private ares_data struct
+** for the specified ares_datatype, initializes c-ares private fields
+** and zero initializes those which later might be used from the public
+** API. It returns an interior pointer which can be passed by c-ares
+** functions to the calling application, and that must be free'ed using
+** c-ares external API function ares_free_data().
+*/
+
+void *ares_malloc_data(ares_datatype type)
+{
+ struct ares_data *ptr;
+
+ ptr = malloc(sizeof(struct ares_data));
+ if (!ptr)
+ return NULL;
+
+ switch (type)
+ {
+ case ARES_DATATYPE_MX_REPLY:
+ ptr->data.mx_reply.next = NULL;
+ ptr->data.mx_reply.host = NULL;
+ ptr->data.mx_reply.priority = 0;
+ break;
+
+ case ARES_DATATYPE_SRV_REPLY:
+ ptr->data.srv_reply.next = NULL;
+ ptr->data.srv_reply.host = NULL;
+ ptr->data.srv_reply.priority = 0;
+ ptr->data.srv_reply.weight = 0;
+ ptr->data.srv_reply.port = 0;
+ break;
+
+ case ARES_DATATYPE_TXT_REPLY:
+ ptr->data.txt_reply.next = NULL;
+ ptr->data.txt_reply.txt = NULL;
+ ptr->data.txt_reply.length = 0;
+ break;
+
+ case ARES_DATATYPE_ADDR_NODE:
+ ptr->data.addr_node.next = NULL;
+ ptr->data.addr_node.family = 0;
+ memset(&ptr->data.addr_node.addrV6, 0,
+ sizeof(ptr->data.addr_node.addrV6));
+ break;
+
+ default:
+ free(ptr);
+ return NULL;
+ }
+
+ ptr->mark = ARES_DATATYPE_MARK;
+ ptr->type = type;
+
+ return &ptr->data;
+}
+
+
+/*
+** ares_get_datatype() - c-ares internal helper function.
+**
+** This function returns the ares_datatype of the data stored in a
+** private ares_data struct when given the public API pointer.
+*/
+
+ares_datatype ares_get_datatype(void * dataptr)
+{
+ struct ares_data *ptr;
+
+#ifdef __INTEL_COMPILER
+# pragma warning(push)
+# pragma warning(disable:1684)
+ /* 1684: conversion from pointer to same-sized integral type */
+#endif
+
+ ptr = (void *)((char *)dataptr - offsetof(struct ares_data, data));
+
+#ifdef __INTEL_COMPILER
+# pragma warning(pop)
+#endif
+
+ if (ptr->mark == ARES_DATATYPE_MARK)
+ return ptr->type;
+
+ return ARES_DATATYPE_UNKNOWN;
+}