lib/json_print.c

   1 /*
   2  * json_print.c         "print regular or json output, based on json_writer".
   3  *
   4  *             This program is free software; you can redistribute it and/or
   5  *             modify it under the terms of the GNU General Public License
   6  *             as published by the Free Software Foundation; either version
   7  *             2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:    Julien Fortin, <julien@cumulusnetworks.com>
  10  */
  11
  12 #include <stdarg.h>
  13 #include <stdio.h>
  14
  15 #include "utils.h"
  16 #include "json_print.h"
  17
  18 static json_writer_t *_jw;
  19
  20 #define _IS_JSON_CONTEXT(type) ((type & PRINT_JSON || type & PRINT_ANY) && _jw)
  21 #define _IS_FP_CONTEXT(type) (!_jw && (type & PRINT_FP || type & PRINT_ANY))
  22
  23 void new_json_obj(int json)
  24 {
  25         if (json) {
  26                 _jw = jsonw_new(stdout);
  27                 if (!_jw) {
  28                         perror("json object");
  29                         exit(1);
  30                 }
  31                 if (pretty)
  32                         jsonw_pretty(_jw, true);
  33                 jsonw_start_array(_jw);
  34         }
  35 }
  36
  37 void delete_json_obj(void)
  38 {
  39         if (_jw) {
  40                 jsonw_end_array(_jw);
  41                 jsonw_destroy(&_jw);
  42         }
  43 }
  44
  45 bool is_json_context(void)
  46 {
  47         return _jw != NULL;
  48 }
  49
  50 json_writer_t *get_json_writer(void)
  51 {
  52         return _jw;
  53 }
  54
  55 void open_json_object(const char *str)
  56 {
  57         if (_IS_JSON_CONTEXT(PRINT_JSON)) {
  58                 if (str)
  59                         jsonw_name(_jw, str);
  60                 jsonw_start_object(_jw);
  61         }
  62 }
  63
  64 void close_json_object(void)
  65 {
  66         if (_IS_JSON_CONTEXT(PRINT_JSON))
  67                 jsonw_end_object(_jw);
  68 }
  69
  70 /*
  71  * Start json array or string array using
  72  * the provided string as json key (if not null)
  73  * or as array delimiter in non-json context.
  74  */
  75 void open_json_array(enum output_type type, const char *str)
  76 {
  77         if (_IS_JSON_CONTEXT(type)) {
  78                 if (str)
  79                         jsonw_name(_jw, str);
  80                 jsonw_start_array(_jw);
  81         } else if (_IS_FP_CONTEXT(type)) {
  82                 printf("%s", str);
  83         }
  84 }
  85
  86 /*
  87  * End json array or string array
  88  */
  89 void close_json_array(enum output_type type, const char *str)
  90 {
  91         if (_IS_JSON_CONTEXT(type)) {
  92                 jsonw_end_array(_jw);
  93         } else if (_IS_FP_CONTEXT(type)) {
  94                 printf("%s", str);
  95         }
  96 }
  97
  98 /*
  99  * pre-processor directive to generate similar
 100  * functions handling different types
 101  */
 102 #define _PRINT_FUNC(type_name, type)                                    \
 103         __attribute__((format(printf, 4, 0)))                           \
 104         void print_color_##type_name(enum output_type t,                \
 105                                      enum color_attr color,             \
 106                                      const char *key,                   \
 107                                      const char *fmt,                   \
 108                                      type value)                        \
 109         {                                                               \
 110                 if (_IS_JSON_CONTEXT(t)) {                              \
 111                         if (!key)                                       \
 112                                 jsonw_##type_name(_jw, value);          \
 113                         else                                            \
 114                                 jsonw_##type_name##_field(_jw, key, value); \
 115                 } else if (_IS_FP_CONTEXT(t)) {                         \
 116                         color_fprintf(stdout, color, fmt, value);          \
 117                 }                                                       \
 118         }
 119 _PRINT_FUNC(int, int);
 120 _PRINT_FUNC(s64, int64_t);
 121 _PRINT_FUNC(hu, unsigned short);
 122 _PRINT_FUNC(uint, unsigned int);
 123 _PRINT_FUNC(u64, uint64_t);
 124 _PRINT_FUNC(luint, unsigned long int);
 125 _PRINT_FUNC(lluint, unsigned long long int);
 126 _PRINT_FUNC(float, double);
 127 #undef _PRINT_FUNC
 128
 129 void print_color_string(enum output_type type,
 130                         enum color_attr color,
 131                         const char *key,
 132                         const char *fmt,
 133                         const char *value)
 134 {
 135         if (_IS_JSON_CONTEXT(type)) {
 136                 if (key && !value)
 137                         jsonw_name(_jw, key);
 138                 else if (!key && value)
 139                         jsonw_string(_jw, value);
 140                 else
 141                         jsonw_string_field(_jw, key, value);
 142         } else if (_IS_FP_CONTEXT(type)) {
 143                 color_fprintf(stdout, color, fmt, value);
 144         }
 145 }
 146
 147 /*
 148  * value's type is bool. When using this function in FP context you can't pass
 149  * a value to it, you will need to use "is_json_context()" to have different
 150  * branch for json and regular output. grep -r "print_bool" for example
 151  */
 152 void print_color_bool(enum output_type type,
 153                       enum color_attr color,
 154                       const char *key,
 155                       const char *fmt,
 156                       bool value)
 157 {
 158         if (_IS_JSON_CONTEXT(type)) {
 159                 if (key)
 160                         jsonw_bool_field(_jw, key, value);
 161                 else
 162                         jsonw_bool(_jw, value);
 163         } else if (_IS_FP_CONTEXT(type)) {
 164                 color_fprintf(stdout, color, fmt, value ? "true" : "false");
 165         }
 166 }
 167
 168 /*
 169  * In JSON context uses hardcode %#x format: 42 -> 0x2a
 170  */
 171 void print_color_0xhex(enum output_type type,
 172                        enum color_attr color,
 173                        const char *key,
 174                        const char *fmt,
 175                        unsigned int hex)
 176 {
 177         if (_IS_JSON_CONTEXT(type)) {
 178                 SPRINT_BUF(b1);
 179
 180                 snprintf(b1, sizeof(b1), "%#x", hex);
 181                 print_string(PRINT_JSON, key, NULL, b1);
 182         } else if (_IS_FP_CONTEXT(type)) {
 183                 color_fprintf(stdout, color, fmt, hex);
 184         }
 185 }
 186
 187 void print_color_hex(enum output_type type,
 188                      enum color_attr color,
 189                      const char *key,
 190                      const char *fmt,
 191                      unsigned int hex)
 192 {
 193         if (_IS_JSON_CONTEXT(type)) {
 194                 SPRINT_BUF(b1);
 195
 196                 snprintf(b1, sizeof(b1), "%x", hex);
 197                 if (key)
 198                         jsonw_string_field(_jw, key, b1);
 199                 else
 200                         jsonw_string(_jw, b1);
 201         } else if (_IS_FP_CONTEXT(type)) {
 202                 color_fprintf(stdout, color, fmt, hex);
 203         }
 204 }
 205
 206 /*
 207  * In JSON context we don't use the argument "value" we simply call jsonw_null
 208  * whereas FP context can use "value" to output anything
 209  */
 210 void print_color_null(enum output_type type,
 211                       enum color_attr color,
 212                       const char *key,
 213                       const char *fmt,
 214                       const char *value)
 215 {
 216         if (_IS_JSON_CONTEXT(type)) {
 217                 if (key)
 218                         jsonw_null_field(_jw, key);
 219                 else
 220                         jsonw_null(_jw);
 221         } else if (_IS_FP_CONTEXT(type)) {
 222                 color_fprintf(stdout, color, fmt, value);
 223         }
 224 }