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source: lib/json.c @ e9eee04

Last change on this file since e9eee04 was b86f37d, checked in by Jelmer Vernooĳ <jelmer@…>, at 2022-08-22T14:48:16Z

Fix error type-punned pointer warning

Dereferencing type-punned pointer will break strict-aliasing rules

Based on upstream[1] commits.

[1] https://github.com/json-parser/json-parser

Based-on: 161dff8321df ("Fix error type-punned pointer warning")
Based-on: d7b67db02aaa ("Fix error type-punned pointer warning")
Bug: https://bugs.gentoo.org/861371
Signed-off-by: Petr Vaněk <arkamar@…>

Property mode set to 100644

File size: 22.0 KB

Rev	Line
[7a80925]	1	/* vim: set et ts=3 sw=3 sts=3 ft=c:
[696dc9e]	2	*
[7a80925]	3	* Copyright (C) 2012, 2013, 2014 James McLaughlin et al. All rights reserved.
[696dc9e]	4	* https://github.com/udp/json-parser
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	*
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	*
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
[7a80925]	30	#include <glib.h>
	31
[696dc9e]	32	#include "json.h"
	33
	34	#ifdef _MSC_VER
	35	#ifndef _CRT_SECURE_NO_WARNINGS
	36	#define _CRT_SECURE_NO_WARNINGS
	37	#endif
	38	#endif
	39
	40	#ifdef __cplusplus
[5ebff60]	41	const struct _json_value json_value_none; /* zero-d by ctor */
[696dc9e]	42	#else
[5ebff60]	43	const struct _json_value json_value_none = { 0 };
[696dc9e]	44	#endif
	45
	46	#include <stdio.h>
	47	#include <string.h>
	48	#include <ctype.h>
[7a80925]	49	#include <math.h>
[696dc9e]	50
[b4b8f1e]	51	typedef unsigned int json_uchar;
[696dc9e]	52
[5ebff60]	53	static unsigned char hex_value(json_char c)
[696dc9e]	54	{
[5ebff60]	55	if (g_ascii_isdigit(c)) {
	56	return c - '0';
	57	}
	58
	59	switch (c) {
	60	case 'a': case 'A': return 0x0A;
	61	case 'b': case 'B': return 0x0B;
	62	case 'c': case 'C': return 0x0C;
	63	case 'd': case 'D': return 0x0D;
	64	case 'e': case 'E': return 0x0E;
	65	case 'f': case 'F': return 0x0F;
	66	default: return 0xFF;
	67	}
[696dc9e]	68	}
	69
[5ebff60]	70	typedef struct {
	71	unsigned long used_memory;
[696dc9e]	72
[5ebff60]	73	unsigned int uint_max;
	74	unsigned long ulong_max;
[696dc9e]	75
[5ebff60]	76	json_settings settings;
	77	int first_pass;
[7a80925]	78
[696dc9e]	79	} json_state;
	80
[5ebff60]	81	static void * default_alloc(size_t size, int zero, void * user_data)
[7a80925]	82	{
[5ebff60]	83	return zero ? calloc(1, size) : malloc(size);
[7a80925]	84	}
	85
[5ebff60]	86	static void default_free(void * ptr, void * user_data)
[696dc9e]	87	{
[5ebff60]	88	free(ptr);
[7a80925]	89	}
[696dc9e]	90
[5ebff60]	91	static void * json_alloc(json_state * state, unsigned long size, int zero)
[7a80925]	92	{
[5ebff60]	93	if ((state->ulong_max - state->used_memory) < size) {
	94	return 0;
	95	}
[696dc9e]	96
[5ebff60]	97	if (state->settings.max_memory
	98	&& (state->used_memory += size) > state->settings.max_memory) {
	99	return 0;
	100	}
[696dc9e]	101
[5ebff60]	102	return state->settings.mem_alloc(size, zero, state->settings.user_data);
[696dc9e]	103	}
	104
	105	static int new_value
[5ebff60]	106	(json_state * state, json_value top, json_value root, json_value ** alloc, json_type type)
[696dc9e]	107	{
[5ebff60]	108	json_value * value;
	109	int values_size;
[696dc9e]	110
[5ebff60]	111	if (!state->first_pass) {
	112	value = top = alloc;
	113	alloc = (alloc)->_reserved.next_alloc;
[696dc9e]	114
[5ebff60]	115	if (!*root) {
	116	*root = value;
	117	}
[696dc9e]	118
[5ebff60]	119	switch (value->type) {
	120	case json_array:
[696dc9e]	121
[5ebff60]	122	if (!(value->u.array.values = (json_value **) json_alloc
	123	(state, value->u.array.length * sizeof(json_value *),
	124	0))) {
	125	return 0;
	126	}
[696dc9e]	127
[5ebff60]	128	value->u.array.length = 0;
	129	break;
[696dc9e]	130
[5ebff60]	131	case json_object:
[696dc9e]	132
[5ebff60]	133	values_size = sizeof(value->u.object.values) value->u.object.length;
[696dc9e]	134
[5ebff60]	135	if (!(((void *) &value->u.object.values) = json_alloc
	136	(state, values_size +
	137	((unsigned long) value->u.object.values),
	138	0))) {
	139	return 0;
	140	}
[696dc9e]	141
[b86f37d]	142	value->_reserved.object_mem = (void ) (((char ) value->u.object.values) + values_size);
[696dc9e]	143
[5ebff60]	144	value->u.object.length = 0;
	145	break;
[696dc9e]	146
[5ebff60]	147	case json_string:
[696dc9e]	148
[5ebff60]	149	if (!(value->u.string.ptr = (json_char *) json_alloc
	150	(state, (value->u.string.length + 1) * sizeof(json_char),
	151	0))) {
	152	return 0;
	153	}
[696dc9e]	154
[5ebff60]	155	value->u.string.length = 0;
	156	break;
[696dc9e]	157
[5ebff60]	158	default:
	159	break;
	160	}
	161	;
[696dc9e]	162
[5ebff60]	163	return 1;
	164	}
[696dc9e]	165
[5ebff60]	166	value = (json_value *) json_alloc(state, sizeof(json_value), 1);
[696dc9e]	167
[5ebff60]	168	if (!value) {
	169	return 0;
	170	}
[696dc9e]	171
[5ebff60]	172	if (!*root) {
	173	*root = value;
	174	}
[696dc9e]	175
[5ebff60]	176	value->type = type;
	177	value->parent = *top;
[696dc9e]	178
[5ebff60]	179	if (*alloc) {
	180	(*alloc)->_reserved.next_alloc = value;
	181	}
[696dc9e]	182
[5ebff60]	183	alloc = top = value;
[696dc9e]	184
[5ebff60]	185	return 1;
[696dc9e]	186	}
	187
	188	#define e_off \
[5ebff60]	189	((int) (i - cur_line_begin))
[696dc9e]	190
	191	#define whitespace \
[5ebff60]	192	case '\n': ++cur_line; cur_line_begin = i; \
	193	case ' ': case '\t': case '\r'
[696dc9e]	194
	195	#define string_add(b) \
[5ebff60]	196	do { if (!state.first_pass) { string [string_length] = b; } ++string_length; } while (0);
[696dc9e]	197
[7a80925]	198	static const long
[5ebff60]	199	flag_next = 1 << 0,
	200	flag_reproc = 1 << 1,
	201	flag_need_comma = 1 << 2,
	202	flag_seek_value = 1 << 3,
	203	flag_escaped = 1 << 4,
	204	flag_string = 1 << 5,
	205	flag_need_colon = 1 << 6,
	206	flag_done = 1 << 7,
	207	flag_num_negative = 1 << 8,
	208	flag_num_zero = 1 << 9,
	209	flag_num_e = 1 << 10,
	210	flag_num_e_got_sign = 1 << 11,
	211	flag_num_e_negative = 1 << 12,
	212	flag_line_comment = 1 << 13,
	213	flag_block_comment = 1 << 14;
	214
	215	json_value * json_parse_ex(json_settings * settings,
	216	const json_char * json,
	217	size_t length,
	218	char * error_buf)
[696dc9e]	219	{
[5ebff60]	220	json_char error [json_error_max];
	221	unsigned int cur_line;
	222	const json_char * cur_line_begin, * i, * end;
	223	json_value * top, * root, * alloc = 0;
	224	json_state state = { 0 };
	225	long flags;
	226	long num_digits = 0, num_e = 0;
	227	json_int_t num_fraction = 0;
	228
	229	/* Skip UTF-8 BOM
	230	*/
	231	if (length >= 3 && ((unsigned char) json [0]) == 0xEF
	232	&& ((unsigned char) json [1]) == 0xBB
	233	&& ((unsigned char) json [2]) == 0xBF) {
	234	json += 3;
	235	length -= 3;
	236	}
	237
	238	error[0] = '\0';
	239	end = (json + length);
	240
	241	memcpy(&state.settings, settings, sizeof(json_settings));
	242
	243	if (!state.settings.mem_alloc) {
	244	state.settings.mem_alloc = default_alloc;
	245	}
	246
	247	if (!state.settings.mem_free) {
	248	state.settings.mem_free = default_free;
	249	}
	250
	251	memset(&state.uint_max, 0xFF, sizeof(state.uint_max));
	252	memset(&state.ulong_max, 0xFF, sizeof(state.ulong_max));
	253
	254	state.uint_max -= 8; /* limit of how much can be added before next check */
	255	state.ulong_max -= 8;
	256
	257	for (state.first_pass = 1; state.first_pass >= 0; --state.first_pass) {
	258	json_uchar uchar;
	259	unsigned char uc_b1, uc_b2, uc_b3, uc_b4;
	260	json_char * string = 0;
	261	unsigned int string_length = 0;
	262
	263	top = root = 0;
	264	flags = flag_seek_value;
	265
	266	cur_line = 1;
	267	cur_line_begin = json;
	268
	269	for (i = json;; ++i) {
	270	json_char b = (i == end ? 0 : *i);
	271
	272	if (flags & flag_string) {
	273	if (!b) {
	274	sprintf(error, "Unexpected EOF in string (at %d:%d)", cur_line, e_off);
	275	goto e_failed;
	276	}
	277
	278	if (string_length > state.uint_max) {
	279	goto e_overflow;
	280	}
	281
	282	if (flags & flag_escaped) {
	283	flags &= ~flag_escaped;
	284
	285	switch (b) {
	286	case 'b': string_add('\b'); break;
	287	case 'f': string_add('\f'); break;
	288	case 'n': string_add('\n'); break;
	289	case 'r': string_add('\r'); break;
	290	case 't': string_add('\t'); break;
	291	case 'u':
	292
	293	if (end - i < 4 \|\|
	294	(uc_b1 = hex_value(++i)) == 0xFF \|\| (uc_b2 = hex_value(++i)) ==
	295	0xFF
	296	\|\| (uc_b3 = hex_value(++i)) == 0xFF \|\| (uc_b4 = hex_value(++i)) ==
	297	0xFF) {
	298	sprintf(error, "Invalid character value `%c` (at %d:%d)", b,
	299	cur_line, e_off);
	300	goto e_failed;
	301	}
	302
	303	uc_b1 = (uc_b1 << 4) \| uc_b2;
	304	uc_b2 = (uc_b3 << 4) \| uc_b4;
	305	uchar = (uc_b1 << 8) \| uc_b2;
	306
	307	if ((uchar & 0xF800) == 0xD800) {
	308	json_uchar uchar2;
	309
	310	if (end - i < 6 \|\| (++i) != '\\' \|\| (++i) != 'u' \|\|
	311	(uc_b1 = hex_value(*++i)) == 0xFF \|\|
	312	(uc_b2 = hex_value(*++i)) == 0xFF
	313	\|\| (uc_b3 = hex_value(*++i)) == 0xFF \|\|
	314	(uc_b4 = hex_value(*++i)) == 0xFF) {
	315	sprintf(error,
	316	"Invalid character value `%c` (at %d:%d)", b,
	317	cur_line, e_off);
	318	goto e_failed;
	319	}
	320
	321	uc_b1 = (uc_b1 << 4) \| uc_b2;
	322	uc_b2 = (uc_b3 << 4) \| uc_b4;
	323	uchar2 = (uc_b1 << 8) \| uc_b2;
	324
	325	uchar = 0x010000 \| ((uchar & 0x3FF) << 10) \| (uchar2 & 0x3FF);
	326	}
	327
	328	if (sizeof(json_char) >= sizeof(json_uchar) \|\| (uchar <= 0x7F)) {
	329	string_add((json_char) uchar);
	330	break;
	331	}
	332
	333	if (uchar <= 0x7FF) {
	334	if (state.first_pass) {
	335	string_length += 2;
	336	} else { string [string_length++] = 0xC0 \|
	337	(uchar >>
	338	6);
	339	string [string_length++] = 0x80 \|
	340	(uchar &
	341	0x3F); }
	342
	343	break;
	344	}
	345
	346	if (uchar <= 0xFFFF) {
	347	if (state.first_pass) {
	348	string_length += 3;
	349	} else { string [string_length++] = 0xE0 \|
	350	(uchar >>
	351	12);
	352	string [string_length++] = 0x80 \|
	353	((uchar
	354	>> 6) &
	355	0x3F);
	356	string [string_length++] = 0x80 \|
	357	(uchar &
	358	0x3F); }
	359
	360	break;
	361	}
	362
	363	if (state.first_pass) {
	364	string_length += 4;
	365	} else { string [string_length++] = 0xF0 \| (uchar >> 18);
	366	string [string_length++] = 0x80 \|
	367	((uchar >>
	368	12) & 0x3F);
	369	string [string_length++] = 0x80 \|
	370	((uchar >>
	371	6) & 0x3F);
	372	string [string_length++] = 0x80 \|
	373	(uchar & 0x3F); }
	374
	375	break;
	376
	377	default:
	378	string_add(b);
	379	}
	380	;
	381
	382	continue;
	383	}
	384
	385	if (b == '\\') {
	386	flags \|= flag_escaped;
	387	continue;
	388	}
	389
	390	if (b == '"') {
	391	if (!state.first_pass) {
	392	string [string_length] = 0;
	393	}
	394
	395	flags &= ~flag_string;
	396	string = 0;
	397
	398	switch (top->type) {
	399	case json_string:
	400
	401	top->u.string.length = string_length;
	402	flags \|= flag_next;
	403
	404	break;
	405
	406	case json_object:
	407
	408	if (state.first_pass) {
[b86f37d]	409	json_char chars = (json_char ) &top->u.object.values;
	410	chars[0] += string_length + 1;
[5ebff60]	411	} else {
	412	top->u.object.values [top->u.object.length].name
	413	= (json_char *) top->_reserved.object_mem;
	414
	415	top->u.object.values [top->u.object.length].name_length
	416	= string_length;
	417
	418	((json_char *) &top->_reserved.object_mem) += string_length +
	419	1;
	420	}
	421
	422	flags \|= flag_seek_value \| flag_need_colon;
	423	continue;
	424
	425	default:
	426	break;
	427	}
	428	;
	429	} else {
	430	string_add(b);
	431	continue;
	432	}
	433	}
	434
	435	if (state.settings.settings & json_enable_comments) {
	436	if (flags & (flag_line_comment \| flag_block_comment)) {
	437	if (flags & flag_line_comment) {
	438	if (b == '\r' \|\| b == '\n' \|\| !b) {
	439	flags &= ~flag_line_comment;
	440	--i; /* so null can be reproc'd */
	441	}
	442
	443	continue;
	444	}
	445
	446	if (flags & flag_block_comment) {
	447	if (!b) {
	448	sprintf(error, "%d:%d: Unexpected EOF in block comment",
	449	cur_line, e_off);
	450	goto e_failed;
	451	}
	452
	453	if (b == '*' && i < (end - 1) && i [1] == '/') {
	454	flags &= ~flag_block_comment;
	455	++i; /* skip closing sequence */
	456	}
	457
	458	continue;
	459	}
	460	} else if (b == '/') {
	461	if (!(flags & (flag_seek_value \| flag_done)) && top->type != json_object) {
	462	sprintf(error, "%d:%d: Comment not allowed here", cur_line, e_off);
	463	goto e_failed;
	464	}
	465
	466	if (++i == end) {
	467	sprintf(error, "%d:%d: EOF unexpected", cur_line, e_off);
	468	goto e_failed;
	469	}
	470
	471	switch (b = *i) {
	472	case '/':
	473	flags \|= flag_line_comment;
	474	continue;
	475
	476	case '*':
	477	flags \|= flag_block_comment;
	478	continue;
	479
	480	default:
	481	sprintf(error, "%d:%d: Unexpected `%c` in comment opening sequence",
	482	cur_line, e_off, b);
	483	goto e_failed;
	484	}
	485	;
	486	}
	487	}
	488
	489	if (flags & flag_done) {
	490	if (!b) {
	491	break;
	492	}
	493
	494	switch (b) {
	495	whitespace:
	496	continue;
	497
	498	default:
	499	sprintf(error, "%d:%d: Trailing garbage: `%c`", cur_line, e_off, b);
	500	goto e_failed;
	501	}
	502	;
	503	}
	504
	505	if (flags & flag_seek_value) {
	506	switch (b) {
	507	whitespace:
	508	continue;
	509
	510	case ']':
	511
[77ed9b7]	512	if (top && top->type == json_array) {
[5ebff60]	513	flags = (flags & ~(flag_need_comma \| flag_seek_value)) \| flag_next;
	514	} else { sprintf(error, "%d:%d: Unexpected ]", cur_line, e_off);
	515	goto e_failed; }
	516
	517	break;
	518
	519	default:
	520
	521	if (flags & flag_need_comma) {
	522	if (b == ',') {
	523	flags &= ~flag_need_comma;
	524	continue;
	525	} else { sprintf(error, "%d:%d: Expected , before %c", cur_line, e_off,
	526	b);
	527	goto e_failed; }
	528	}
	529
	530	if (flags & flag_need_colon) {
	531	if (b == ':') {
	532	flags &= ~flag_need_colon;
	533	continue;
	534	} else { sprintf(error, "%d:%d: Expected : before %c", cur_line, e_off,
	535	b);
	536	goto e_failed; }
	537	}
	538
	539	flags &= ~flag_seek_value;
[696dc9e]	540
[5ebff60]	541	switch (b) {
	542	case '{':
[696dc9e]	543
[5ebff60]	544	if (!new_value(&state, &top, &root, &alloc, json_object)) {
	545	goto e_alloc_failure;
	546	}
	547
	548	continue;
[696dc9e]	549
[5ebff60]	550	case '[':
[696dc9e]	551
[5ebff60]	552	if (!new_value(&state, &top, &root, &alloc, json_array)) {
	553	goto e_alloc_failure;
	554	}
	555
	556	flags \|= flag_seek_value;
	557	continue;
	558
	559	case '"':
	560
	561	if (!new_value(&state, &top, &root, &alloc, json_string)) {
	562	goto e_alloc_failure;
	563	}
	564
	565	flags \|= flag_string;
	566
	567	string = top->u.string.ptr;
	568	string_length = 0;
[696dc9e]	569
[5ebff60]	570	continue;
	571
	572	case 't':
[696dc9e]	573
[5ebff60]	574	if ((end - i) < 3 \|\| (++i) != 'r' \|\| (++i) != 'u' \|\| *(++i) != 'e') {
	575	goto e_unknown_value;
	576	}
[696dc9e]	577
[5ebff60]	578	if (!new_value(&state, &top, &root, &alloc, json_boolean)) {
	579	goto e_alloc_failure;
	580	}
[696dc9e]	581
[5ebff60]	582	top->u.boolean = 1;
[7a80925]	583
[5ebff60]	584	flags \|= flag_next;
	585	break;
[7a80925]	586
[5ebff60]	587	case 'f':
[7a80925]	588
[5ebff60]	589	if ((end - i) < 4 \|\| (++i) != 'a' \|\| (++i) != 'l' \|\| *(++i) != 's' \|\|
	590	*(++i) != 'e') {
	591	goto e_unknown_value;
	592	}
[7a80925]	593
[5ebff60]	594	if (!new_value(&state, &top, &root, &alloc, json_boolean)) {
	595	goto e_alloc_failure;
	596	}
[7a80925]	597
[5ebff60]	598	flags \|= flag_next;
	599	break;
[7a80925]	600
[5ebff60]	601	case 'n':
[696dc9e]	602
[5ebff60]	603	if ((end - i) < 3 \|\| (++i) != 'u' \|\| (++i) != 'l' \|\| *(++i) != 'l') {
	604	goto e_unknown_value;
	605	}
[696dc9e]	606
[5ebff60]	607	if (!new_value(&state, &top, &root, &alloc, json_null)) {
	608	goto e_alloc_failure;
	609	}
[696dc9e]	610
[5ebff60]	611	flags \|= flag_next;
	612	break;
[696dc9e]	613
[5ebff60]	614	default:
[696dc9e]	615
[5ebff60]	616	if (g_ascii_isdigit(b) \|\| b == '-') {
	617	if (!new_value(&state, &top, &root, &alloc, json_integer)) {
	618	goto e_alloc_failure;
	619	}
[696dc9e]	620
[5ebff60]	621	if (!state.first_pass) {
	622	while (g_ascii_isdigit(b) \|\| b == '+' \|\| b == '-'
	623	\|\| b == 'e' \|\| b == 'E' \|\| b == '.') {
	624	if ((++i) == end) {
	625	b = 0;
	626	break;
	627	}
[696dc9e]	628
[5ebff60]	629	b = *i;
	630	}
[696dc9e]	631
[5ebff60]	632	flags \|= flag_next \| flag_reproc;
	633	break;
	634	}
[696dc9e]	635
[5ebff60]	636	flags &= ~(flag_num_negative \| flag_num_e \|
	637	flag_num_e_got_sign \| flag_num_e_negative \|
	638	flag_num_zero);
[696dc9e]	639
[5ebff60]	640	num_digits = 0;
	641	num_fraction = 0;
	642	num_e = 0;
[696dc9e]	643
[5ebff60]	644	if (b != '-') {
	645	flags \|= flag_reproc;
	646	break;
	647	}
[696dc9e]	648
[5ebff60]	649	flags \|= flag_num_negative;
	650	continue;
	651	} else { sprintf(error, "%d:%d: Unexpected %c when seeking value",
	652	cur_line, e_off, b);
	653	goto e_failed; }
	654	}
	655	;
	656	}
	657	;
	658	} else {
	659	switch (top->type) {
	660	case json_object:
	661
	662	switch (b) {
	663	whitespace:
	664	continue;
	665
	666	case '"':
	667
	668	if (flags & flag_need_comma) {
	669	sprintf(error, "%d:%d: Expected , before \"", cur_line, e_off);
	670	goto e_failed;
	671	}
	672
	673	flags \|= flag_string;
	674
	675	string = (json_char *) top->_reserved.object_mem;
	676	string_length = 0;
	677
	678	break;
	679
	680	case '}':
	681
	682	flags = (flags & ~flag_need_comma) \| flag_next;
	683	break;
	684
	685	case ',':
	686
	687	if (flags & flag_need_comma) {
	688	flags &= ~flag_need_comma;
	689	break;
	690	}
	691
	692	default:
	693
	694	sprintf(error, "%d:%d: Unexpected `%c` in object", cur_line, e_off, b);
	695	goto e_failed;
	696	}
	697	;
	698
	699	break;
	700
	701	case json_integer:
	702	case json_double:
	703
	704	if (g_ascii_isdigit(b)) {
	705	++num_digits;
	706
	707	if (top->type == json_integer \|\| flags & flag_num_e) {
	708	if (!(flags & flag_num_e)) {
	709	if (flags & flag_num_zero) {
	710	sprintf(error,
	711	"%d:%d: Unexpected `0` before `%c`",
	712	cur_line, e_off, b);
	713	goto e_failed;
	714	}
	715
	716	if (num_digits == 1 && b == '0') {
	717	flags \|= flag_num_zero;
	718	}
	719	} else {
	720	flags \|= flag_num_e_got_sign;
	721	num_e = (num_e * 10) + (b - '0');
	722	continue;
	723	}
	724
	725	top->u.integer = (top->u.integer * 10) + (b - '0');
	726	continue;
	727	}
	728
	729	num_fraction = (num_fraction * 10) + (b - '0');
	730	continue;
	731	}
	732
	733	if (b == '+' \|\| b == '-') {
	734	if ((flags & flag_num_e) && !(flags & flag_num_e_got_sign)) {
	735	flags \|= flag_num_e_got_sign;
	736
	737	if (b == '-') {
	738	flags \|= flag_num_e_negative;
	739	}
	740
	741	continue;
	742	}
	743	} else if (b == '.' && top->type == json_integer) {
	744	if (!num_digits) {
	745	sprintf(error, "%d:%d: Expected digit before `.`", cur_line,
	746	e_off);
	747	goto e_failed;
	748	}
	749
	750	top->type = json_double;
	751	top->u.dbl = (double) top->u.integer;
	752
	753	num_digits = 0;
	754	continue;
	755	}
	756
	757	if (!(flags & flag_num_e)) {
	758	if (top->type == json_double) {
	759	if (!num_digits) {
	760	sprintf(error, "%d:%d: Expected digit after `.`",
	761	cur_line, e_off);
	762	goto e_failed;
	763	}
	764
	765	top->u.dbl += ((double) num_fraction) /
	766	(pow(10, (double) num_digits));
	767	}
	768
	769	if (b == 'e' \|\| b == 'E') {
	770	flags \|= flag_num_e;
	771
	772	if (top->type == json_integer) {
	773	top->type = json_double;
	774	top->u.dbl = (double) top->u.integer;
	775	}
	776
	777	num_digits = 0;
	778	flags &= ~flag_num_zero;
	779
	780	continue;
	781	}
	782	} else {
	783	if (!num_digits) {
	784	sprintf(error, "%d:%d: Expected digit after `e`", cur_line,
	785	e_off);
	786	goto e_failed;
	787	}
	788
	789	top->u.dbl *=
	790	pow(10,
	791	(double) (flags & flag_num_e_negative ? -num_e : num_e));
	792	}
	793
	794	if (flags & flag_num_negative) {
	795	if (top->type == json_integer) {
	796	top->u.integer = -top->u.integer;
	797	} else {
	798	top->u.dbl = -top->u.dbl;
	799	}
	800	}
	801
	802	flags \|= flag_next \| flag_reproc;
	803	break;
	804
	805	default:
	806	break;
	807	}
	808	;
	809	}
	810
	811	if (flags & flag_reproc) {
	812	flags &= ~flag_reproc;
	813	--i;
	814	}
	815
	816	if (flags & flag_next) {
	817	flags = (flags & ~flag_next) \| flag_need_comma;
	818
	819	if (!top->parent) {
	820	/* root value done */
	821
	822	flags \|= flag_done;
	823	continue;
	824	}
	825
	826	if (top->parent->type == json_array) {
	827	flags \|= flag_seek_value;
	828	}
	829
	830	if (!state.first_pass) {
	831	json_value * parent = top->parent;
	832
	833	switch (parent->type) {
	834	case json_object:
	835
	836	parent->u.object.values
	837	[parent->u.object.length].value = top;
	838
	839	break;
	840
	841	case json_array:
	842
	843	parent->u.array.values
	844	[parent->u.array.length] = top;
[696dc9e]	845
[5ebff60]	846	break;
[696dc9e]	847
[5ebff60]	848	default:
	849	break;
	850	}
	851	;
	852	}
[696dc9e]	853
[5ebff60]	854	if ((++top->parent->u.array.length) > state.uint_max) {
	855	goto e_overflow;
	856	}
[696dc9e]	857
[5ebff60]	858	top = top->parent;
[696dc9e]	859
[5ebff60]	860	continue;
	861	}
	862	}
	863
	864	alloc = root;
	865	}
	866
	867	return root;
	868
	869	e_unknown_value:
	870
	871	sprintf(error, "%d:%d: Unknown value", cur_line, e_off);
	872	goto e_failed;
	873
	874	e_alloc_failure:
	875
	876	strcpy(error, "Memory allocation failure");
	877	goto e_failed;
	878
	879	e_overflow:
	880
	881	sprintf(error, "%d:%d: Too long (caught overflow)", cur_line, e_off);
	882	goto e_failed;
	883
	884	e_failed:
	885
	886	if (error_buf) {
	887	if (*error) {
	888	strcpy(error_buf, error);
	889	} else {
	890	strcpy(error_buf, "Unknown error");
	891	}
	892	}
	893
	894	if (state.first_pass) {
	895	alloc = root;
	896	}
	897
	898	while (alloc) {
	899	top = alloc->_reserved.next_alloc;
	900	state.settings.mem_free(alloc, state.settings.user_data);
	901	alloc = top;
	902	}
	903
	904	if (!state.first_pass) {
	905	json_value_free_ex(&state.settings, root);
	906	}
	907
	908	return 0;
[696dc9e]	909	}
	910
[5ebff60]	911	json_value * json_parse(const json_char * json, size_t length)
[696dc9e]	912	{
[5ebff60]	913	json_settings settings = { 0 };
	914
	915	return json_parse_ex(&settings, json, length, 0);
[696dc9e]	916	}
	917
[5ebff60]	918	void json_value_free_ex(json_settings * settings, json_value * value)
[696dc9e]	919	{
[5ebff60]	920	json_value * cur_value;
[696dc9e]	921
[5ebff60]	922	if (!value) {
	923	return;
	924	}
[696dc9e]	925
[5ebff60]	926	value->parent = 0;
[696dc9e]	927
[5ebff60]	928	while (value) {
	929	switch (value->type) {
	930	case json_array:
[696dc9e]	931
[5ebff60]	932	if (!value->u.array.length) {
	933	settings->mem_free(value->u.array.values, settings->user_data);
	934	break;
	935	}
[696dc9e]	936
[5ebff60]	937	value = value->u.array.values [--value->u.array.length];
	938	continue;
[696dc9e]	939
[5ebff60]	940	case json_object:
[696dc9e]	941
[5ebff60]	942	if (!value->u.object.length) {
	943	settings->mem_free(value->u.object.values, settings->user_data);
	944	break;
	945	}
[696dc9e]	946
[5ebff60]	947	value = value->u.object.values [--value->u.object.length].value;
	948	continue;
[696dc9e]	949
[5ebff60]	950	case json_string:
[696dc9e]	951
[5ebff60]	952	settings->mem_free(value->u.string.ptr, settings->user_data);
	953	break;
[696dc9e]	954
[5ebff60]	955	default:
	956	break;
	957	}
	958	;
[696dc9e]	959
[5ebff60]	960	cur_value = value;
	961	value = value->parent;
	962	settings->mem_free(cur_value, settings->user_data);
	963	}
[696dc9e]	964	}
	965
[5ebff60]	966	void json_value_free(json_value * value)
[7a80925]	967	{
[5ebff60]	968	json_settings settings = { 0 };
	969
	970	settings.mem_free = default_free;
	971	json_value_free_ex(&settings, value);
[7a80925]	972	}
[696dc9e]	973

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source: lib/json.c @ e9eee04

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