d8d8b00862
This is essentially a backport of iproute2's
commit ed54f76484b5 ("json: fix backslash escape typo in jsonw_puts")
Also added the stdio.h include in json_writer.h to be able to compile
and run the json_writer test as used below).
Before this fix:
$ gcc -D notused -D TEST -I../../include -o json_writer json_writer.c
json_writer.h
$ ./json_writer
{
"Vyatta": {
"url": "http://vyatta.com",
"downloads": 2000000,
"stock": 8.16,
"ARGV": [],
"empty": [],
"NIL": {},
"my_null": null,
"special chars": [
"slash": "/",
"newline": "\n",
"tab": "\t",
"ff": "\f",
"quote": "\"",
"tick": "'",
"backslash": "\n"
]
}
}
After:
$ gcc -D notused -D TEST -I../../include -o json_writer json_writer.c
json_writer.h
$ ./json_writer
{
"Vyatta": {
"url": "http://vyatta.com",
"downloads": 2000000,
"stock": 8.16,
"ARGV": [],
"empty": [],
"NIL": {},
"my_null": null,
"special chars": [
"slash": "/",
"newline": "\n",
"tab": "\t",
"ff": "\f",
"quote": "\"",
"tick": "'",
"backslash": "\\"
]
}
}
Signed-off-by: Manu Bretelle <chantr4@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20230329073002.2026563-1-chantr4@gmail.com
75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
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/*
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* Simple streaming JSON writer
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*
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* This takes care of the annoying bits of JSON syntax like the commas
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* after elements
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*
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* Authors: Stephen Hemminger <stephen@networkplumber.org>
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*/
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#ifndef _JSON_WRITER_H_
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#define _JSON_WRITER_H_
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <linux/compiler.h>
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/* Opaque class structure */
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typedef struct json_writer json_writer_t;
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/* Create a new JSON stream */
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json_writer_t *jsonw_new(FILE *f);
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/* End output to JSON stream */
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void jsonw_destroy(json_writer_t **self_p);
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/* Cause output to have pretty whitespace */
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void jsonw_pretty(json_writer_t *self, bool on);
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/* Reset separator to create new JSON */
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void jsonw_reset(json_writer_t *self);
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/* Add property name */
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void jsonw_name(json_writer_t *self, const char *name);
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/* Add value */
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void __printf(2, 0) jsonw_vprintf_enquote(json_writer_t *self, const char *fmt,
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va_list ap);
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void __printf(2, 3) jsonw_printf(json_writer_t *self, const char *fmt, ...);
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void jsonw_string(json_writer_t *self, const char *value);
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void jsonw_bool(json_writer_t *self, bool value);
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void jsonw_float(json_writer_t *self, double number);
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void jsonw_float_fmt(json_writer_t *self, const char *fmt, double num);
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void jsonw_uint(json_writer_t *self, uint64_t number);
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void jsonw_hu(json_writer_t *self, unsigned short number);
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void jsonw_int(json_writer_t *self, int64_t number);
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void jsonw_null(json_writer_t *self);
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void jsonw_lluint(json_writer_t *self, unsigned long long int num);
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/* Useful Combinations of name and value */
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void jsonw_string_field(json_writer_t *self, const char *prop, const char *val);
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void jsonw_bool_field(json_writer_t *self, const char *prop, bool value);
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void jsonw_float_field(json_writer_t *self, const char *prop, double num);
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void jsonw_uint_field(json_writer_t *self, const char *prop, uint64_t num);
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void jsonw_hu_field(json_writer_t *self, const char *prop, unsigned short num);
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void jsonw_int_field(json_writer_t *self, const char *prop, int64_t num);
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void jsonw_null_field(json_writer_t *self, const char *prop);
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void jsonw_lluint_field(json_writer_t *self, const char *prop,
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unsigned long long int num);
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void jsonw_float_field_fmt(json_writer_t *self, const char *prop,
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const char *fmt, double val);
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/* Collections */
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void jsonw_start_object(json_writer_t *self);
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void jsonw_end_object(json_writer_t *self);
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void jsonw_start_array(json_writer_t *self);
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void jsonw_end_array(json_writer_t *self);
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/* Override default exception handling */
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typedef void (jsonw_err_handler_fn)(const char *);
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#endif /* _JSON_WRITER_H_ */
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