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 21 /* Opaque class structure */ 22 typedef struct json_writer json_writer_t; 23 24 /* Create a new JSON stream */ 25 json_writer_t *jsonw_new(FILE *f); 26 /* End output to JSON stream */ 27 void jsonw_destroy(json_writer_t **self_p); 28 29 /* Cause output to have pretty whitespace */ 30 void jsonw_pretty(json_writer_t *self, bool on); 31 32 /* Add property name */ 33 void jsonw_name(json_writer_t *self, const char *name); 34 35 /* Add value */ 36 void jsonw_string(json_writer_t *self, const char *value); 37 void jsonw_bool(json_writer_t *self, bool value); 38 void jsonw_float(json_writer_t *self, double number); 39 void jsonw_uint(json_writer_t *self, uint64_t number); 40 void jsonw_int(json_writer_t *self, int64_t number); 41 void jsonw_null(json_writer_t *self); 42 43 /* Useful Combinations of name and value */ 44 void jsonw_string_field(json_writer_t *self, const char *prop, const char *val); 45 void jsonw_bool_field(json_writer_t *self, const char *prop, bool value); 46 void jsonw_float_field(json_writer_t *self, const char *prop, double num); 47 void jsonw_uint_field(json_writer_t *self, const char *prop, uint64_t num); 48 void jsonw_int_field(json_writer_t *self, const char *prop, int64_t num); 49 void jsonw_null_field(json_writer_t *self, const char *prop); 50 51 /* Collections */ 52 void jsonw_start_object(json_writer_t *self); 53 void jsonw_end_object(json_writer_t *self); 54 55 void jsonw_start_array(json_writer_t *self); 56 void jsonw_end_array(json_writer_t *self); 57 58 /* Override default exception handling */ 59 typedef void (jsonw_err_handler_fn)(const char *); 60 61 #endif /* _JSON_WRITER_H_ */ 62