FD.io VPP  v17.10-9-gd594711
Vector Packet Processing
json_format.c
Go to the documentation of this file.
1 /*
2  *------------------------------------------------------------------
3  * json_format.c
4  *
5  * Copyright (c) 2015 Cisco and/or its affiliates.
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at:
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  *------------------------------------------------------------------
18 
19 */
20 #include <inttypes.h>
21 #include "json_format.h"
22 #include <vnet/ip/ip.h>
23 #include <vppinfra/vec.h>
24 
25 #define VAT_TAB_WIDTH 2
26 
27 typedef struct vat_print_ctx_s
28 {
29  FILE *ofp;
32 
33 /* Format an IP4 address. */
34 static u8 *
35 vat_json_format_ip4_address (u8 * s, va_list * args)
36 {
37  u8 *a = va_arg (*args, u8 *);
38  return format (s, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
39 }
40 
41 /* Format an IP6 address. */
42 static u8 *
43 vat_json_format_ip6_address (u8 * s, va_list * args)
44 {
45  ip6_address_t *a = va_arg (*args, ip6_address_t *);
46  u32 i, i_max_n_zero, max_n_zeros, i_first_zero, n_zeros, last_double_colon;
47 
48  i_max_n_zero = ARRAY_LEN (a->as_u16);
49  max_n_zeros = 0;
50  i_first_zero = i_max_n_zero;
51  n_zeros = 0;
52  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
53  {
54  u32 is_zero = a->as_u16[i] == 0;
55  if (is_zero && i_first_zero >= ARRAY_LEN (a->as_u16))
56  {
57  i_first_zero = i;
58  n_zeros = 0;
59  }
60  n_zeros += is_zero;
61  if ((!is_zero && n_zeros > max_n_zeros)
62  || (i + 1 >= ARRAY_LEN (a->as_u16) && n_zeros > max_n_zeros))
63  {
64  i_max_n_zero = i_first_zero;
65  max_n_zeros = n_zeros;
66  i_first_zero = ARRAY_LEN (a->as_u16);
67  n_zeros = 0;
68  }
69  }
70 
71  last_double_colon = 0;
72  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
73  {
74  if (i == i_max_n_zero && max_n_zeros > 1)
75  {
76  s = format (s, "::");
77  i += max_n_zeros - 1;
78  last_double_colon = 1;
79  }
80  else
81  {
82  s = format (s, "%s%x",
83  (last_double_colon || i == 0) ? "" : ":",
84  clib_net_to_host_u16 (a->as_u16[i]));
85  last_double_colon = 0;
86  }
87  }
88 
89  return s;
90 }
91 
92 static void
94 {
95  int i;
96  for (i = 0; i < ctx->indent * VAT_TAB_WIDTH; i++)
97  {
98  fformat (ctx->ofp, " ");
99  }
100 }
101 
102 static void
104 {
105  va_list va;
106 
107  vat_json_indent_print (ctx);
108  va_start (va, fmt);
109  va_fformat (ctx->ofp, fmt, &va);
110  va_end (va);
111 }
112 
113 static u8
115 {
116  vat_json_node_t *elem;
117  vec_foreach (elem, p)
118  {
119  if (VAT_JSON_INT != elem->type && VAT_JSON_UINT != elem->type)
120  {
121  return 0;
122  }
123  }
124  return 1;
125 }
126 
127 static void
129 {
130 #define P(fmt,...) fformat(ctx->ofp, fmt, ##__VA_ARGS__)
131 #define PL(fmt,...) fformat(ctx->ofp, fmt"\n", ##__VA_ARGS__)
132 #define PPL(fmt,...) vat_json_indent_line(ctx, fmt"\n", ##__VA_ARGS__)
133 #define PP(fmt,...) vat_json_indent_line(ctx, fmt, ##__VA_ARGS__)
134 #define INCR (ctx->indent++)
135 #define DECR (ctx->indent--)
136 
137  vat_json_pair_t *pair;
138  u32 i, count;
139  vat_json_node_t *elem;
140  u8 num_only = 0;
141 
142  if (!node)
143  {
144  return;
145  }
146 
147  switch (node->type)
148  {
149  case VAT_JSON_OBJECT:
150  count = vec_len (node->pairs);
151  if (count >= 1)
152  {
153  PL ("{");
154  INCR;
155  for (i = 0; i < count; i++)
156  {
157  pair = &node->pairs[i];
158  PP ("\"%s\": ", pair->name);
159  vat_json_print_internal (ctx, &pair->value);
160  if (i < count - 1)
161  {
162  P (",");
163  }
164  PL ();
165  }
166  DECR;
167  PP ("}");
168  }
169  else
170  {
171  P ("{}");
172  }
173  break;
174  case VAT_JSON_ARRAY:
175  num_only = is_num_only (node->array);
176  count = vec_len (node->array);
177  if (count >= 1)
178  {
179  if (num_only)
180  P ("[");
181  else
182  PL ("[ ");
183  INCR;
184  for (i = 0; i < count; i++)
185  {
186  elem = &node->array[i];
187  if (!num_only)
188  {
189  vat_json_indent_print (ctx);
190  }
191  vat_json_print_internal (ctx, elem);
192  if (i < count - 1)
193  {
194  if (num_only)
195  {
196  P (", ");
197  }
198  else
199  {
200  P (",");
201  }
202  }
203  if (!num_only)
204  PL ();
205  }
206  DECR;
207  if (!num_only)
208  PP ("]");
209  else
210  P ("]");
211  }
212  else
213  {
214  P ("[]");
215  }
216  break;
217  case VAT_JSON_INT:
218  P ("%d", node->sint);
219  break;
220  case VAT_JSON_UINT:
221  P ("%" PRIu64, node->uint);
222  break;
223  case VAT_JSON_REAL:
224  P ("%f", node->real);
225  break;
226  case VAT_JSON_STRING:
227  P ("\"%s\"", node->string);
228  break;
229  case VAT_JSON_IPV4:
230  P ("\"%U\"", vat_json_format_ip4_address, &node->ip4);
231  break;
232  case VAT_JSON_IPV6:
233  P ("\"%U\"", vat_json_format_ip6_address, &node->ip6);
234  break;
235  default:
236  break;
237  }
238 #undef PPL
239 #undef PP
240 #undef PL
241 #undef P
242 }
243 
244 void
246 {
248  memset (&ctx, 0, sizeof ctx);
249  ctx.indent = 0;
250  ctx.ofp = ofp;
251  fformat (ofp, "\n");
252  vat_json_print_internal (&ctx, node);
253  fformat (ofp, "\n");
254 }
255 
256 void
258 {
259  int i = 0;
260 
261  if (NULL == node)
262  {
263  return;
264  }
265  switch (node->type)
266  {
267  case VAT_JSON_OBJECT:
268  for (i = 0; i < vec_len (node->pairs); i++)
269  {
270  vat_json_free (&node->pairs[i].value);
271  }
272  if (NULL != node->pairs)
273  {
274  vec_free (node->pairs);
275  }
276  break;
277  case VAT_JSON_ARRAY:
278  for (i = 0; i < vec_len (node->array); i++)
279  {
280  vat_json_free (&node->array[i]);
281  }
282  if (NULL != node->array)
283  {
284  vec_free (node->array);
285  }
286  break;
287  case VAT_JSON_STRING:
288  if (NULL != node->string)
289  {
290  vec_free (node->string);
291  }
292  break;
293  default:
294  break;
295  }
296 }
297 
298 /*
299  * fd.io coding-style-patch-verification: ON
300  *
301  * Local Variables:
302  * eval: (c-set-style "gnu")
303  * End:
304  */
struct in6_addr ip6
Definition: json_format.h:55
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:337
static u8 * vat_json_format_ip6_address(u8 *s, va_list *args)
Definition: json_format.c:43
void vat_json_print(FILE *ofp, vat_json_node_t *node)
Definition: json_format.c:245
a
Definition: bitmap.h:516
static u8 is_num_only(vat_json_node_t *p)
Definition: json_format.c:114
#define NULL
Definition: clib.h:55
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
#define DECR
#define PP(fmt,...)
#define P(fmt,...)
struct vat_print_ctx_s vat_print_ctx_t
#define PL(fmt,...)
static void vat_json_print_internal(vat_print_ctx_t *ctx, vat_json_node_t *node)
Definition: json_format.c:128
vat_json_val_type_t type
Definition: json_format.h:48
vat_json_node_t value
Definition: json_format.h:65
static void vat_json_indent_print(vat_print_ctx_t *ctx)
Definition: json_format.c:93
void vat_json_free(vat_json_node_t *node)
Definition: json_format.c:257
word fformat(FILE *f, char *fmt,...)
Definition: format.c:453
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:336
vat_json_node_t * array
Definition: json_format.h:52
#define ARRAY_LEN(x)
Definition: clib.h:59
struct in_addr ip4
Definition: json_format.h:54
unsigned int u32
Definition: types.h:88
long ctx[MAX_CONNS]
Definition: main.c:95
size_t count
Definition: vapi.c:40
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
word va_fformat(FILE *f, char *fmt, va_list *va)
Definition: format.c:429
unsigned char u8
Definition: types.h:56
static u8 * vat_json_format_ip4_address(u8 *s, va_list *args)
Definition: json_format.c:35
#define VAT_TAB_WIDTH
Definition: json_format.c:25
#define vec_foreach(var, vec)
Vector iterator.
static void vat_json_indent_line(vat_print_ctx_t *ctx, char *fmt,...)
Definition: json_format.c:103
u16 as_u16[8]
Definition: ip6_packet.h:49
const char * name
Definition: json_format.h:64
vat_json_pair_t * pairs
Definition: json_format.h:51
CLIB vectors are ubiquitous dynamically resized arrays with by user defined "headers".
#define INCR