forked from cesanta/mongoose
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathmongoose.c
7514 lines (6789 loc) · 246 KB
/
mongoose.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright (c) 2004-2013 Sergey Lyubka
// Copyright (c) 2013-2022 Cesanta Software Limited
// All rights reserved
//
// This software is dual-licensed: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation. For the terms of this
// license, see http://www.gnu.org/licenses/
//
// You are free to use this software under the terms of the GNU General
// Public License, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// Alternatively, you can license this software under a commercial
// license, as set out in https://www.mongoose.ws/licensing/
//
// SPDX-License-Identifier: GPL-2.0-only or commercial
#include "mongoose.h"
#ifdef MG_ENABLE_LINES
#line 1 "src/base64.c"
#endif
static int mg_b64idx(int c) {
if (c < 26) {
return c + 'A';
} else if (c < 52) {
return c - 26 + 'a';
} else if (c < 62) {
return c - 52 + '0';
} else {
return c == 62 ? '+' : '/';
}
}
static int mg_b64rev(int c) {
if (c >= 'A' && c <= 'Z') {
return c - 'A';
} else if (c >= 'a' && c <= 'z') {
return c + 26 - 'a';
} else if (c >= '0' && c <= '9') {
return c + 52 - '0';
} else if (c == '+') {
return 62;
} else if (c == '/') {
return 63;
} else if (c == '=') {
return 64;
} else {
return -1;
}
}
int mg_base64_update(unsigned char ch, char *to, int n) {
int rem = (n & 3) % 3;
if (rem == 0) {
to[n] = (char) mg_b64idx(ch >> 2);
to[++n] = (char) ((ch & 3) << 4);
} else if (rem == 1) {
to[n] = (char) mg_b64idx(to[n] | (ch >> 4));
to[++n] = (char) ((ch & 15) << 2);
} else {
to[n] = (char) mg_b64idx(to[n] | (ch >> 6));
to[++n] = (char) mg_b64idx(ch & 63);
n++;
}
return n;
}
int mg_base64_final(char *to, int n) {
int saved = n;
// printf("---[%.*s]\n", n, to);
if (n & 3) n = mg_base64_update(0, to, n);
if ((saved & 3) == 2) n--;
// printf(" %d[%.*s]\n", n, n, to);
while (n & 3) to[n++] = '=';
to[n] = '\0';
return n;
}
int mg_base64_encode(const unsigned char *p, int n, char *to) {
int i, len = 0;
for (i = 0; i < n; i++) len = mg_base64_update(p[i], to, len);
len = mg_base64_final(to, len);
return len;
}
int mg_base64_decode(const char *src, int n, char *dst) {
const char *end = src == NULL ? NULL : src + n; // Cannot add to NULL
int len = 0;
while (src != NULL && src + 3 < end) {
int a = mg_b64rev(src[0]), b = mg_b64rev(src[1]), c = mg_b64rev(src[2]),
d = mg_b64rev(src[3]);
if (a == 64 || a < 0 || b == 64 || b < 0 || c < 0 || d < 0) return 0;
dst[len++] = (char) ((a << 2) | (b >> 4));
if (src[2] != '=') {
dst[len++] = (char) ((b << 4) | (c >> 2));
if (src[3] != '=') dst[len++] = (char) ((c << 6) | d);
}
src += 4;
}
dst[len] = '\0';
return len;
}
#ifdef MG_ENABLE_LINES
#line 1 "src/dns.c"
#endif
struct dns_data {
struct dns_data *next;
struct mg_connection *c;
uint64_t expire;
uint16_t txnid;
};
static void mg_sendnsreq(struct mg_connection *, struct mg_str *, int,
struct mg_dns *, bool);
static void mg_dns_free(struct mg_connection *c, struct dns_data *d) {
LIST_DELETE(struct dns_data,
(struct dns_data **) &c->mgr->active_dns_requests, d);
free(d);
}
void mg_resolve_cancel(struct mg_connection *c) {
struct dns_data *tmp, *d = (struct dns_data *) c->mgr->active_dns_requests;
for (; d != NULL; d = tmp) {
tmp = d->next;
if (d->c == c) mg_dns_free(c, d);
}
}
static size_t mg_dns_parse_name_depth(const uint8_t *s, size_t len, size_t ofs,
char *to, size_t tolen, size_t j,
int depth) {
size_t i = 0;
if (tolen > 0 && depth == 0) to[0] = '\0';
if (depth > 5) return 0;
// MG_INFO(("ofs %lx %x %x", (unsigned long) ofs, s[ofs], s[ofs + 1]));
while (ofs + i + 1 < len) {
size_t n = s[ofs + i];
if (n == 0) {
i++;
break;
}
if (n & 0xc0) {
size_t ptr = (((n & 0x3f) << 8) | s[ofs + i + 1]); // 12 is hdr len
// MG_INFO(("PTR %lx", (unsigned long) ptr));
if (ptr + 1 < len && (s[ptr] & 0xc0) == 0 &&
mg_dns_parse_name_depth(s, len, ptr, to, tolen, j, depth + 1) == 0)
return 0;
i += 2;
break;
}
if (ofs + i + n + 1 >= len) return 0;
if (j > 0) {
if (j < tolen) to[j] = '.';
j++;
}
if (j + n < tolen) memcpy(&to[j], &s[ofs + i + 1], n);
j += n;
i += n + 1;
if (j < tolen) to[j] = '\0'; // Zero-terminate this chunk
// MG_INFO(("--> [%s]", to));
}
if (tolen > 0) to[tolen - 1] = '\0'; // Make sure make sure it is nul-term
return i;
}
static size_t mg_dns_parse_name(const uint8_t *s, size_t n, size_t ofs,
char *dst, size_t dstlen) {
return mg_dns_parse_name_depth(s, n, ofs, dst, dstlen, 0, 0);
}
size_t mg_dns_parse_rr(const uint8_t *buf, size_t len, size_t ofs,
bool is_question, struct mg_dns_rr *rr) {
const uint8_t *s = buf + ofs, *e = &buf[len];
memset(rr, 0, sizeof(*rr));
if (len < sizeof(struct mg_dns_header)) return 0; // Too small
if (len > 512) return 0; // Too large, we don't expect that
if (s >= e) return 0; // Overflow
if ((rr->nlen = (uint16_t) mg_dns_parse_name(buf, len, ofs, NULL, 0)) == 0)
return 0;
s += rr->nlen + 4;
if (s > e) return 0;
rr->atype = (uint16_t) (((uint16_t) s[-4] << 8) | s[-3]);
rr->aclass = (uint16_t) (((uint16_t) s[-2] << 8) | s[-1]);
if (is_question) return (size_t) (rr->nlen + 4);
s += 6;
if (s > e) return 0;
rr->alen = (uint16_t) (((uint16_t) s[-2] << 8) | s[-1]);
if (s + rr->alen > e) return 0;
return (size_t) (rr->nlen + rr->alen + 10);
}
bool mg_dns_parse(const uint8_t *buf, size_t len, struct mg_dns_message *dm) {
const struct mg_dns_header *h = (struct mg_dns_header *) buf;
struct mg_dns_rr rr;
size_t i, n, ofs = sizeof(*h);
memset(dm, 0, sizeof(*dm));
if (len < sizeof(*h)) return 0; // Too small, headers dont fit
if (mg_ntohs(h->num_questions) > 1) return 0; // Sanity
if (mg_ntohs(h->num_answers) > 10) return 0; // Sanity
dm->txnid = mg_ntohs(h->txnid);
for (i = 0; i < mg_ntohs(h->num_questions); i++) {
if ((n = mg_dns_parse_rr(buf, len, ofs, true, &rr)) == 0) return false;
// MG_INFO(("Q %lu %lu %hu/%hu", ofs, n, rr.atype, rr.aclass));
ofs += n;
}
for (i = 0; i < mg_ntohs(h->num_answers); i++) {
if ((n = mg_dns_parse_rr(buf, len, ofs, false, &rr)) == 0) return false;
// MG_INFO(("A -- %lu %lu %hu/%hu %s", ofs, n, rr.atype, rr.aclass,
// dm->name));
mg_dns_parse_name(buf, len, ofs, dm->name, sizeof(dm->name));
ofs += n;
if (rr.alen == 4 && rr.atype == 1 && rr.aclass == 1) {
dm->addr.is_ip6 = false;
memcpy(&dm->addr.ip, &buf[ofs - 4], 4);
dm->resolved = true;
break; // Return success
} else if (rr.alen == 16 && rr.atype == 28 && rr.aclass == 1) {
dm->addr.is_ip6 = true;
memcpy(&dm->addr.ip6, &buf[ofs - 16], 16);
dm->resolved = true;
break; // Return success
}
}
return true;
}
static void dns_cb(struct mg_connection *c, int ev, void *ev_data,
void *fn_data) {
struct dns_data *d, *tmp;
if (ev == MG_EV_POLL) {
uint64_t now = *(uint64_t *) ev_data;
for (d = (struct dns_data *) c->mgr->active_dns_requests; d != NULL;
d = tmp) {
tmp = d->next;
// MG_DEBUG ("%lu %lu dns poll", d->expire, now));
if (now > d->expire) mg_error(d->c, "DNS timeout");
}
} else if (ev == MG_EV_READ) {
struct mg_dns_message dm;
int resolved = 0;
if (mg_dns_parse(c->recv.buf, c->recv.len, &dm) == false) {
MG_ERROR(("Unexpected DNS response:"));
mg_hexdump(c->recv.buf, c->recv.len);
} else {
// MG_VERBOSE(("%s %d", dm.name, dm.resolved));
for (d = (struct dns_data *) c->mgr->active_dns_requests; d != NULL;
d = tmp) {
tmp = d->next;
// MG_INFO(("d %p %hu %hu", d, d->txnid, dm.txnid));
if (dm.txnid != d->txnid) continue;
if (d->c->is_resolving) {
if (dm.resolved) {
dm.addr.port = d->c->rem.port; // Save port
d->c->rem = dm.addr; // Copy resolved address
MG_DEBUG(
("%lu %s is %I", d->c->id, dm.name, d->c->rem.is_ip6 ? 16 : 4,
d->c->rem.is_ip6 ? &d->c->rem.ip6 : (void *) &d->c->rem.ip));
mg_connect_resolved(d->c);
#if MG_ENABLE_IPV6
} else if (dm.addr.is_ip6 == false && dm.name[0] != '\0' &&
c->mgr->use_dns6 == false) {
struct mg_str x = mg_str(dm.name);
mg_sendnsreq(d->c, &x, c->mgr->dnstimeout, &c->mgr->dns6, true);
#endif
} else {
mg_error(d->c, "%s DNS lookup failed", dm.name);
}
} else {
MG_ERROR(("%lu already resolved", d->c->id));
}
mg_dns_free(c, d);
resolved = 1;
}
}
if (!resolved) MG_ERROR(("stray DNS reply"));
c->recv.len = 0;
} else if (ev == MG_EV_CLOSE) {
for (d = (struct dns_data *) c->mgr->active_dns_requests; d != NULL;
d = tmp) {
tmp = d->next;
mg_error(d->c, "DNS error");
mg_dns_free(c, d);
}
}
(void) fn_data;
}
static bool mg_dns_send(struct mg_connection *c, const struct mg_str *name,
uint16_t txnid, bool ipv6) {
struct {
struct mg_dns_header header;
uint8_t data[256];
} pkt;
size_t i, n;
memset(&pkt, 0, sizeof(pkt));
pkt.header.txnid = mg_htons(txnid);
pkt.header.flags = mg_htons(0x100);
pkt.header.num_questions = mg_htons(1);
for (i = n = 0; i < sizeof(pkt.data) - 5; i++) {
if (name->ptr[i] == '.' || i >= name->len) {
pkt.data[n] = (uint8_t) (i - n);
memcpy(&pkt.data[n + 1], name->ptr + n, i - n);
n = i + 1;
}
if (i >= name->len) break;
}
memcpy(&pkt.data[n], "\x00\x00\x01\x00\x01", 5); // A query
n += 5;
if (ipv6) pkt.data[n - 3] = 0x1c; // AAAA query
// memcpy(&pkt.data[n], "\xc0\x0c\x00\x1c\x00\x01", 6); // AAAA query
// n += 6;
return mg_send(c, &pkt, sizeof(pkt.header) + n);
}
static void mg_sendnsreq(struct mg_connection *c, struct mg_str *name, int ms,
struct mg_dns *dnsc, bool ipv6) {
struct dns_data *d = NULL;
if (dnsc->url == NULL) {
mg_error(c, "DNS server URL is NULL. Call mg_mgr_init()");
} else if (dnsc->c == NULL) {
dnsc->c = mg_connect(c->mgr, dnsc->url, NULL, NULL);
if (dnsc->c != NULL) {
dnsc->c->pfn = dns_cb;
// dnsc->c->is_hexdumping = 1;
}
}
if (dnsc->c == NULL) {
mg_error(c, "resolver");
} else if ((d = (struct dns_data *) calloc(1, sizeof(*d))) == NULL) {
mg_error(c, "resolve OOM");
} else {
struct dns_data *reqs = (struct dns_data *) c->mgr->active_dns_requests;
d->txnid = reqs ? (uint16_t) (reqs->txnid + 1) : 1;
d->next = (struct dns_data *) c->mgr->active_dns_requests;
c->mgr->active_dns_requests = d;
d->expire = mg_millis() + (uint64_t) ms;
d->c = c;
c->is_resolving = 1;
MG_VERBOSE(("%lu resolving %.*s @ %s, txnid %hu", c->id, (int) name->len,
name->ptr, &dnsc->url, d->txnid));
if (!mg_dns_send(dnsc->c, name, d->txnid, ipv6)) {
mg_error(dnsc->c, "DNS send");
}
}
}
void mg_resolve(struct mg_connection *c, const char *url) {
struct mg_str host = mg_url_host(url);
c->rem.port = mg_htons(mg_url_port(url));
if (mg_aton(host, &c->rem)) {
// host is an IP address, do not fire name resolution
mg_connect_resolved(c);
} else {
// host is not an IP, send DNS resolution request
struct mg_dns *dns = c->mgr->use_dns6 ? &c->mgr->dns6 : &c->mgr->dns4;
mg_sendnsreq(c, &host, c->mgr->dnstimeout, dns, c->mgr->use_dns6);
}
}
#ifdef MG_ENABLE_LINES
#line 1 "src/event.c"
#endif
void mg_call(struct mg_connection *c, int ev, void *ev_data) {
// Run user-defined handler first, in order to give it an ability
// to intercept processing (e.g. clean input buffer) before the
// protocol handler kicks in
if (c->fn != NULL) c->fn(c, ev, ev_data, c->fn_data);
if (c->pfn != NULL) c->pfn(c, ev, ev_data, c->pfn_data);
}
void mg_error(struct mg_connection *c, const char *fmt, ...) {
char buf[64];
va_list ap;
va_start(ap, fmt);
mg_vsnprintf(buf, sizeof(buf), fmt, &ap);
va_end(ap);
MG_ERROR(("%lu %p %s", c->id, c->fd, buf));
c->is_closing = 1; // Set is_closing before sending MG_EV_CALL
mg_call(c, MG_EV_ERROR, buf); // Let user handler to override it
}
#ifdef MG_ENABLE_LINES
#line 1 "src/fmt.c"
#endif
static void mg_pfn_iobuf_private(char ch, void *param, bool expand) {
struct mg_iobuf *io = (struct mg_iobuf *) param;
if (expand && io->len + 2 > io->size) mg_iobuf_resize(io, io->len + 2);
if (io->len + 2 <= io->size) {
io->buf[io->len++] = (uint8_t) ch;
io->buf[io->len] = 0;
} else if (io->len < io->size) {
io->buf[io->len++] = 0; // Guarantee to 0-terminate
}
}
static void mg_putchar_iobuf_static(char ch, void *param) {
mg_pfn_iobuf_private(ch, param, false);
}
void mg_pfn_iobuf(char ch, void *param) {
mg_pfn_iobuf_private(ch, param, true);
}
size_t mg_vsnprintf(char *buf, size_t len, const char *fmt, va_list *ap) {
struct mg_iobuf io = {(uint8_t *) buf, len, 0, 0};
size_t n = mg_vxprintf(mg_putchar_iobuf_static, &io, fmt, ap);
if (n < len) buf[n] = '\0';
return n;
}
size_t mg_snprintf(char *buf, size_t len, const char *fmt, ...) {
va_list ap;
size_t n;
va_start(ap, fmt);
n = mg_vsnprintf(buf, len, fmt, &ap);
va_end(ap);
return n;
}
char *mg_vmprintf(const char *fmt, va_list *ap) {
struct mg_iobuf io = {0, 0, 0, 256};
mg_vxprintf(mg_pfn_iobuf, &io, fmt, ap);
return (char *) io.buf;
}
char *mg_mprintf(const char *fmt, ...) {
char *s;
va_list ap;
va_start(ap, fmt);
s = mg_vmprintf(fmt, &ap);
va_end(ap);
return s;
}
size_t mg_xprintf(void (*out)(char, void *), void *ptr, const char *fmt, ...) {
size_t len = 0;
va_list ap;
va_start(ap, fmt);
len = mg_vxprintf(out, ptr, fmt, &ap);
va_end(ap);
return len;
}
static bool is_digit(int c) {
return c >= '0' && c <= '9';
}
static int addexp(char *buf, int e, int sign) {
int n = 0;
buf[n++] = 'e';
buf[n++] = (char) sign;
if (e > 400) return 0;
if (e < 10) buf[n++] = '0';
if (e >= 100) buf[n++] = (char) (e / 100 + '0'), e -= 100 * (e / 100);
if (e >= 10) buf[n++] = (char) (e / 10 + '0'), e -= 10 * (e / 10);
buf[n++] = (char) (e + '0');
return n;
}
static int xisinf(double x) {
union {
double f;
uint64_t u;
} ieee754 = {x};
return ((unsigned) (ieee754.u >> 32) & 0x7fffffff) == 0x7ff00000 &&
((unsigned) ieee754.u == 0);
}
static int xisnan(double x) {
union {
double f;
uint64_t u;
} ieee754 = {x};
return ((unsigned) (ieee754.u >> 32) & 0x7fffffff) +
((unsigned) ieee754.u != 0) >
0x7ff00000;
}
static size_t mg_dtoa(char *dst, size_t dstlen, double d, int width) {
char buf[40];
int i, s = 0, n = 0, e = 0;
double t, mul, saved;
if (d == 0.0) return mg_snprintf(dst, dstlen, "%s", "0");
if (xisinf(d)) return mg_snprintf(dst, dstlen, "%s", d > 0 ? "inf" : "-inf");
if (xisnan(d)) return mg_snprintf(dst, dstlen, "%s", "nan");
if (d < 0.0) d = -d, buf[s++] = '-';
// Round
saved = d;
mul = 1.0;
while (d >= 10.0 && d / mul >= 10.0) mul *= 10.0;
while (d <= 1.0 && d / mul <= 1.0) mul /= 10.0;
for (i = 0, t = mul * 5; i < width; i++) t /= 10.0;
d += t;
// Calculate exponent, and 'mul' for scientific representation
mul = 1.0;
while (d >= 10.0 && d / mul >= 10.0) mul *= 10.0, e++;
while (d < 1.0 && d / mul < 1.0) mul /= 10.0, e--;
// printf(" --> %g %d %g %g\n", saved, e, t, mul);
if (e >= width) {
n = (int) mg_dtoa(buf, sizeof(buf), saved / mul, width);
// printf(" --> %.*g %d [%.*s]\n", 10, d / t, e, n, buf);
n += addexp(buf + s + n, e, '+');
return mg_snprintf(dst, dstlen, "%.*s", n, buf);
} else if (e <= -width) {
n = (int) mg_dtoa(buf, sizeof(buf), saved / mul, width);
// printf(" --> %.*g %d [%.*s]\n", 10, d / mul, e, n, buf);
n += addexp(buf + s + n, -e, '-');
return mg_snprintf(dst, dstlen, "%.*s", n, buf);
} else {
for (i = 0, t = mul; t >= 1.0 && s + n < (int) sizeof(buf); i++) {
int ch = (int) (d / t);
if (n > 0 || ch > 0) buf[s + n++] = (char) (ch + '0');
d -= ch * t;
t /= 10.0;
}
// printf(" --> [%g] -> %g %g (%d) [%.*s]\n", saved, d, t, n, s + n, buf);
if (n == 0) buf[s++] = '0';
while (t >= 1.0 && n + s < (int) sizeof(buf)) buf[n++] = '0', t /= 10.0;
if (s + n < (int) sizeof(buf)) buf[n + s++] = '.';
// printf(" 1--> [%g] -> [%.*s]\n", saved, s + n, buf);
for (i = 0, t = 0.1; s + n < (int) sizeof(buf) && n < width; i++) {
int ch = (int) (d / t);
buf[s + n++] = (char) (ch + '0');
d -= ch * t;
t /= 10.0;
}
}
while (n > 0 && buf[s + n - 1] == '0') n--; // Trim trailing zeros
if (n > 0 && buf[s + n - 1] == '.') n--; // Trim trailing dot
n += s;
if (n >= (int) sizeof(buf)) n = (int) sizeof(buf) - 1;
buf[n] = '\0';
return mg_snprintf(dst, dstlen, "%s", buf);
}
static size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex) {
const char *letters = "0123456789abcdef";
uint64_t v = (uint64_t) val;
size_t s = 0, n, i;
if (is_signed && val < 0) buf[s++] = '-', v = (uint64_t) (-val);
// This loop prints a number in reverse order. I guess this is because we
// write numbers from right to left: least significant digit comes last.
// Maybe because we use Arabic numbers, and Arabs write RTL?
if (is_hex) {
for (n = 0; v; v >>= 4) buf[s + n++] = letters[v & 15];
} else {
for (n = 0; v; v /= 10) buf[s + n++] = letters[v % 10];
}
// Reverse a string
for (i = 0; i < n / 2; i++) {
char t = buf[s + i];
buf[s + i] = buf[s + n - i - 1], buf[s + n - i - 1] = t;
}
if (val == 0) buf[n++] = '0'; // Handle special case
return n + s;
}
static size_t scpy(void (*out)(char, void *), void *ptr, char *buf,
size_t len) {
size_t i = 0;
while (i < len && buf[i] != '\0') out(buf[i++], ptr);
return i;
}
static char mg_esc(int c, bool esc) {
const char *p, *esc1 = "\b\f\n\r\t\\\"", *esc2 = "bfnrt\\\"";
for (p = esc ? esc1 : esc2; *p != '\0'; p++) {
if (*p == c) return esc ? esc2[p - esc1] : esc1[p - esc2];
}
return 0;
}
static char mg_escape(int c) {
return mg_esc(c, true);
}
static size_t qcpy(void (*out)(char, void *), void *ptr, char *buf,
size_t len) {
size_t i = 0, extra = 0;
for (i = 0; i < len && buf[i] != '\0'; i++) {
char c = mg_escape(buf[i]);
if (c) {
out('\\', ptr), out(c, ptr), extra++;
} else {
out(buf[i], ptr);
}
}
return i + extra;
}
static size_t Qcpy(void (*out)(char, void *), void *ptr, char *buf,
size_t len) {
size_t n = 2;
out('"', ptr);
n += qcpy(out, ptr, buf, len);
out('"', ptr);
return n;
}
static size_t bcpy(void (*out)(char, void *), void *ptr, uint8_t *buf,
size_t len) {
size_t i, n = 0;
const char *t =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
out('"', ptr), n++;
for (i = 0; i < len; i += 3) {
uint8_t c1 = buf[i], c2 = i + 1 < len ? buf[i + 1] : 0,
c3 = i + 2 < len ? buf[i + 2] : 0;
char tmp[4] = {t[c1 >> 2], t[(c1 & 3) << 4 | (c2 >> 4)], '=', '='};
if (i + 1 < len) tmp[2] = t[(c2 & 15) << 2 | (c3 >> 6)];
if (i + 2 < len) tmp[3] = t[c3 & 63];
n += scpy(out, ptr, tmp, sizeof(tmp));
}
out('"', ptr), n++;
return n;
}
size_t mg_vxprintf(void (*out)(char, void *), void *param, const char *fmt,
va_list *ap) {
size_t i = 0, n = 0;
while (fmt[i] != '\0') {
if (fmt[i] == '%') {
size_t j, k, x = 0, is_long = 0, w = 0 /* width */, pr = ~0U /* prec */;
char pad = ' ', minus = 0, c = fmt[++i];
if (c == '#') x++, c = fmt[++i];
if (c == '-') minus++, c = fmt[++i];
if (c == '0') pad = '0', c = fmt[++i];
while (is_digit(c)) w *= 10, w += (size_t) (c - '0'), c = fmt[++i];
if (c == '.') {
c = fmt[++i];
if (c == '*') {
pr = (size_t) va_arg(*ap, int);
c = fmt[++i];
} else {
pr = 0;
while (is_digit(c)) pr *= 10, pr += (size_t) (c - '0'), c = fmt[++i];
}
}
while (c == 'h') c = fmt[++i]; // Treat h and hh as int
if (c == 'l') {
is_long++, c = fmt[++i];
if (c == 'l') is_long++, c = fmt[++i];
}
if (c == 'p') x = 1, is_long = 1;
if (c == 'd' || c == 'u' || c == 'x' || c == 'X' || c == 'p' ||
c == 'g' || c == 'f') {
bool s = (c == 'd'), h = (c == 'x' || c == 'X' || c == 'p');
char tmp[40];
size_t xl = x ? 2 : 0;
if (c == 'g' || c == 'f') {
double v = va_arg(*ap, double);
if (pr == ~0U) pr = 6;
k = mg_dtoa(tmp, sizeof(tmp), v, (int) pr);
} else if (is_long == 2) {
int64_t v = va_arg(*ap, int64_t);
k = mg_lld(tmp, v, s, h);
} else if (is_long == 1) {
long v = va_arg(*ap, long);
k = mg_lld(tmp, s ? (int64_t) v : (int64_t) (unsigned long) v, s, h);
} else {
int v = va_arg(*ap, int);
k = mg_lld(tmp, s ? (int64_t) v : (int64_t) (unsigned) v, s, h);
}
for (j = 0; j < xl && w > 0; j++) w--;
for (j = 0; pad == ' ' && !minus && k < w && j + k < w; j++)
n += scpy(out, param, &pad, 1);
n += scpy(out, param, (char *) "0x", xl);
for (j = 0; pad == '0' && k < w && j + k < w; j++)
n += scpy(out, param, &pad, 1);
n += scpy(out, param, tmp, k);
for (j = 0; pad == ' ' && minus && k < w && j + k < w; j++)
n += scpy(out, param, &pad, 1);
} else if (c == 'M') {
mg_pm_t f = va_arg(*ap, mg_pm_t);
n += f(out, param, ap);
} else if (c == 'c') {
int ch = va_arg(*ap, int);
out((char) ch, param);
n++;
} else if (c == 'H') {
// Print hex-encoded double-quoted string
size_t bl = (size_t) va_arg(*ap, int);
uint8_t *p = va_arg(*ap, uint8_t *), dquote = '"';
const char *hex = "0123456789abcdef";
n += scpy(out, param, (char *) &dquote, 1);
for (j = 0; j < bl; j++) {
n += scpy(out, param, (char *) &hex[(p[j] >> 4) & 15], 1);
n += scpy(out, param, (char *) &hex[p[j] & 15], 1);
}
n += scpy(out, param, (char *) &dquote, 1);
} else if (c == 'I') {
// Print IPv4 or IPv6 address
size_t len = (size_t) va_arg(*ap, int); // Length 16 means IPv6 address
uint8_t *buf = va_arg(*ap, uint8_t *); // Pointer to the IP address
if (len == 6) {
uint16_t *p = (uint16_t *) buf;
n += mg_xprintf(out, param, "%x:%x:%x:%x:%x:%x:%x:%x", mg_htons(p[0]),
mg_htons(p[1]), mg_htons(p[2]), mg_htons(p[3]),
mg_htons(p[4]), mg_htons(p[5]), mg_htons(p[6]),
mg_htons(p[7]));
} else {
n += mg_xprintf(out, param, "%d.%d.%d.%d", (int) buf[0], (int) buf[1],
(int) buf[2], (int) buf[3]);
}
} else if (c == 'A') {
// Print hardware addresses (currently Ethernet MAC)
uint8_t *buf = va_arg(*ap, uint8_t *); // Pointer to the hw address
n += mg_xprintf(out, param, "%02x:%02x:%02x:%02x:%02x:%02x",
(int) buf[0], (int) buf[1], (int) buf[2], (int) buf[3],
(int) buf[4], (int) buf[5]);
} else if (c == 'V') {
// Print base64-encoded double-quoted string
size_t len = (size_t) va_arg(*ap, int);
uint8_t *buf = va_arg(*ap, uint8_t *);
n += bcpy(out, param, buf, len);
} else if (c == 's' || c == 'Q' || c == 'q') {
char *p = va_arg(*ap, char *);
size_t (*f)(void (*)(char, void *), void *, char *, size_t) = scpy;
if (c == 'Q') f = Qcpy;
if (c == 'q') f = qcpy;
if (pr == ~0U) pr = p == NULL ? 0 : strlen(p);
for (j = 0; !minus && pr < w && j + pr < w; j++)
n += f(out, param, &pad, 1);
n += f(out, param, p, pr);
for (j = 0; minus && pr < w && j + pr < w; j++)
n += f(out, param, &pad, 1);
} else if (c == '%') {
out('%', param);
n++;
} else {
out('%', param);
out(c, param);
n += 2;
}
i++;
} else {
out(fmt[i], param), n++, i++;
}
}
return n;
}
#ifdef MG_ENABLE_LINES
#line 1 "src/fs.c"
#endif
struct mg_fd *mg_fs_open(struct mg_fs *fs, const char *path, int flags) {
struct mg_fd *fd = (struct mg_fd *) calloc(1, sizeof(*fd));
if (fd != NULL) {
fd->fd = fs->op(path, flags);
fd->fs = fs;
if (fd->fd == NULL) {
free(fd);
fd = NULL;
}
}
return fd;
}
void mg_fs_close(struct mg_fd *fd) {
if (fd != NULL) {
fd->fs->cl(fd->fd);
free(fd);
}
}
char *mg_file_read(struct mg_fs *fs, const char *path, size_t *sizep) {
struct mg_fd *fd;
char *data = NULL;
size_t size = 0;
fs->st(path, &size, NULL);
if ((fd = mg_fs_open(fs, path, MG_FS_READ)) != NULL) {
data = (char *) calloc(1, size + 1);
if (data != NULL) {
if (fs->rd(fd->fd, data, size) != size) {
free(data);
data = NULL;
} else {
data[size] = '\0';
if (sizep != NULL) *sizep = size;
}
}
mg_fs_close(fd);
}
return data;
}
bool mg_file_write(struct mg_fs *fs, const char *path, const void *buf,
size_t len) {
bool result = false;
struct mg_fd *fd;
char tmp[MG_PATH_MAX];
mg_snprintf(tmp, sizeof(tmp), "%s..%d", path, rand());
if ((fd = mg_fs_open(fs, tmp, MG_FS_WRITE)) != NULL) {
result = fs->wr(fd->fd, buf, len) == len;
mg_fs_close(fd);
if (result) {
fs->rm(path);
fs->mv(tmp, path);
} else {
fs->rm(tmp);
}
}
return result;
}
bool mg_file_printf(struct mg_fs *fs, const char *path, const char *fmt, ...) {
va_list ap;
char *data;
bool result = false;
va_start(ap, fmt);
data = mg_vmprintf(fmt, &ap);
va_end(ap);
result = mg_file_write(fs, path, data, strlen(data));
free(data);
return result;
}
#ifdef MG_ENABLE_LINES
#line 1 "src/fs_fat.c"
#endif
#if MG_ENABLE_FATFS
#include <ff.h>
static int mg_days_from_epoch(int y, int m, int d) {
y -= m <= 2;
int era = y / 400;
int yoe = y - era * 400;
int doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + d - 1;
int doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
return era * 146097 + doe - 719468;
}
static time_t mg_timegm(const struct tm *t) {
int year = t->tm_year + 1900;
int month = t->tm_mon; // 0-11
if (month > 11) {
year += month / 12;
month %= 12;
} else if (month < 0) {
int years_diff = (11 - month) / 12;
year -= years_diff;
month += 12 * years_diff;
}
int x = mg_days_from_epoch(year, month + 1, t->tm_mday);
return 60 * (60 * (24L * x + t->tm_hour) + t->tm_min) + t->tm_sec;
}
static time_t ff_time_to_epoch(uint16_t fdate, uint16_t ftime) {
struct tm tm;
memset(&tm, 0, sizeof(struct tm));
tm.tm_sec = (ftime << 1) & 0x3e;
tm.tm_min = ((ftime >> 5) & 0x3f);
tm.tm_hour = ((ftime >> 11) & 0x1f);
tm.tm_mday = (fdate & 0x1f);
tm.tm_mon = ((fdate >> 5) & 0x0f) - 1;
tm.tm_year = ((fdate >> 9) & 0x7f) + 80;
return mg_timegm(&tm);
}
static int ff_stat(const char *path, size_t *size, time_t *mtime) {
FILINFO fi;
if (path[0] == '\0') {
if (size) *size = 0;
if (mtime) *mtime = 0;
return MG_FS_DIR;
} else if (f_stat(path, &fi) == 0) {
if (size) *size = (size_t) fi.fsize;
if (mtime) *mtime = ff_time_to_epoch(fi.fdate, fi.ftime);
return MG_FS_READ | MG_FS_WRITE | ((fi.fattrib & AM_DIR) ? MG_FS_DIR : 0);
} else {
return 0;
}
}
static void ff_list(const char *dir, void (*fn)(const char *, void *),
void *userdata) {
DIR d;
FILINFO fi;
if (f_opendir(&d, dir) == FR_OK) {
while (f_readdir(&d, &fi) == FR_OK && fi.fname[0] != '\0') {
if (!strcmp(fi.fname, ".") || !strcmp(fi.fname, "..")) continue;
fn(fi.fname, userdata);
}
f_closedir(&d);
}
}
static void *ff_open(const char *path, int flags) {
FIL f;
unsigned char mode = FA_READ;
if (flags & MG_FS_WRITE) mode |= FA_WRITE | FA_OPEN_ALWAYS | FA_OPEN_APPEND;
if (f_open(&f, path, mode) == 0) {
FIL *fp = calloc(1, sizeof(*fp));
memcpy(fp, &f, sizeof(*fp));
return fp;
} else {
return NULL;
}
}
static void ff_close(void *fp) {
if (fp != NULL) {
f_close((FIL *) fp);
free(fp);
}
}
static size_t ff_read(void *fp, void *buf, size_t len) {
UINT n = 0, misalign = ((size_t) buf) & 3;
if (misalign) {
char aligned[4];
f_read((FIL *) fp, aligned, len > misalign ? misalign : len, &n);
memcpy(buf, aligned, n);
} else {
f_read((FIL *) fp, buf, len, &n);
}
return n;
}
static size_t ff_write(void *fp, const void *buf, size_t len) {
UINT n = 0;
return f_write((FIL *) fp, (char *) buf, len, &n) == FR_OK ? n : 0;
}
static size_t ff_seek(void *fp, size_t offset) {
f_lseek((FIL *) fp, offset);
return offset;
}
static bool ff_rename(const char *from, const char *to) {
return f_rename(from, to) == FR_OK;
}
static bool ff_remove(const char *path) {
return f_unlink(path) == FR_OK;
}
static bool ff_mkdir(const char *path) {
return f_mkdir(path) == FR_OK;
}
struct mg_fs mg_fs_fat = {ff_stat, ff_list, ff_open, ff_close, ff_read,
ff_write, ff_seek, ff_rename, ff_remove, ff_mkdir};
#endif
#ifdef MG_ENABLE_LINES
#line 1 "src/fs_packed.c"
#endif
struct packed_file {
const char *data;
size_t size;
size_t pos;
};
const char *mg_unpack(const char *path, size_t *size, time_t *mtime);
const char *mg_unlist(size_t no);
#if MG_ENABLE_PACKED_FS