tools/bpf/bpftool/json_writer.h

   1 /*
   2  * Simple streaming JSON writer
   3  *
   4  * This takes care of the annoying bits of JSON syntax like the commas
   5  * after elements
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  *
  12  * Authors:     Stephen Hemminger <stephen@networkplumber.org>
  13  */
  14
  15 #ifndef _JSON_WRITER_H_
  16 #define _JSON_WRITER_H_
  17
  18 #include <stdbool.h>
  19 #include <stdint.h>
  20 #include <stdarg.h>
  21
  22 /* Opaque class structure */
  23 typedef struct json_writer json_writer_t;
  24
  25 /* Create a new JSON stream */
  26 json_writer_t *jsonw_new(FILE *f);
  27 /* End output to JSON stream */
  28 void jsonw_destroy(json_writer_t **self_p);
  29
  30 /* Cause output to have pretty whitespace */
  31 void jsonw_pretty(json_writer_t *self, bool on);
  32
  33 /* Add property name */
  34 void jsonw_name(json_writer_t *self, const char *name);
  35
  36 /* Add value  */
  37 void jsonw_vprintf_enquote(json_writer_t *self, const char *fmt, va_list ap);
  38 void jsonw_printf(json_writer_t *self, const char *fmt, ...);
  39 void jsonw_string(json_writer_t *self, const char *value);
  40 void jsonw_bool(json_writer_t *self, bool value);
  41 void jsonw_float(json_writer_t *self, double number);
  42 void jsonw_float_fmt(json_writer_t *self, const char *fmt, double num);
  43 void jsonw_uint(json_writer_t *self, uint64_t number);
  44 void jsonw_hu(json_writer_t *self, unsigned short number);
  45 void jsonw_int(json_writer_t *self, int64_t number);
  46 void jsonw_null(json_writer_t *self);
  47 void jsonw_lluint(json_writer_t *self, unsigned long long int num);
  48
  49 /* Useful Combinations of name and value */
  50 void jsonw_string_field(json_writer_t *self, const char *prop, const char *val);
  51 void jsonw_bool_field(json_writer_t *self, const char *prop, bool value);
  52 void jsonw_float_field(json_writer_t *self, const char *prop, double num);
  53 void jsonw_uint_field(json_writer_t *self, const char *prop, uint64_t num);
  54 void jsonw_hu_field(json_writer_t *self, const char *prop, unsigned short num);
  55 void jsonw_int_field(json_writer_t *self, const char *prop, int64_t num);
  56 void jsonw_null_field(json_writer_t *self, const char *prop);
  57 void jsonw_lluint_field(json_writer_t *self, const char *prop,
  58                         unsigned long long int num);
  59 void jsonw_float_field_fmt(json_writer_t *self, const char *prop,
  60                            const char *fmt, double val);
  61
  62 /* Collections */
  63 void jsonw_start_object(json_writer_t *self);
  64 void jsonw_end_object(json_writer_t *self);
  65
  66 void jsonw_start_array(json_writer_t *self);
  67 void jsonw_end_array(json_writer_t *self);
  68
  69 /* Override default exception handling */
  70 typedef void (jsonw_err_handler_fn)(const char *);
  71
  72 #endif /* _JSON_WRITER_H_ */