source: azure_iot_hub/trunk/musl-1.1.18/src/multibyte/mbsrtowcs.c@ 388

Last change on this file since 388 was 388, checked in by coas-nagasima, 5 years ago

Azure IoT Hub Device C SDK を使ったサンプルの追加
  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
  • Property svn:mime-type set to text/x-csrc
File size: 2.0 KB
Line 
1#include <stdint.h>
2#include <wchar.h>
3#include <errno.h>
4#include <string.h>
5#include <stdlib.h>
6#include "internal.h"
7
8size_t mbsrtowcs(wchar_t *restrict ws, const char **restrict src, size_t wn, mbstate_t *restrict st)
9{
10 const unsigned char *s = (const void *)*src;
11 size_t wn0 = wn;
12 unsigned c = 0;
13
14 if (st && (c = *(unsigned *)st)) {
15 if (ws) {
16 *(unsigned *)st = 0;
17 goto resume;
18 } else {
19 goto resume0;
20 }
21 }
22
23 if (MB_CUR_MAX==1) {
24 if (!ws) return strlen((const char *)s);
25 for (;;) {
26 if (!wn) {
27 *src = (const void *)s;
28 return wn0;
29 }
30 if (!*s) break;
31 c = *s++;
32 *ws++ = CODEUNIT(c);
33 wn--;
34 }
35 *ws = 0;
36 *src = 0;
37 return wn0-wn;
38 }
39
40 if (!ws) for (;;) {
41 if (*s-1u < 0x7f && (uintptr_t)s%4 == 0) {
42 while (!(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) {
43 s += 4;
44 wn -= 4;
45 }
46 }
47 if (*s-1u < 0x7f) {
48 s++;
49 wn--;
50 continue;
51 }
52 if (*s-SA > SB-SA) break;
53 c = bittab[*s++-SA];
54resume0:
55 if (OOB(c,*s)) { s--; break; }
56 s++;
57 if (c&(1U<<25)) {
58 if (*s-0x80u >= 0x40) { s-=2; break; }
59 s++;
60 if (c&(1U<<19)) {
61 if (*s-0x80u >= 0x40) { s-=3; break; }
62 s++;
63 }
64 }
65 wn--;
66 c = 0;
67 } else for (;;) {
68 if (!wn) {
69 *src = (const void *)s;
70 return wn0;
71 }
72 if (*s-1u < 0x7f && (uintptr_t)s%4 == 0) {
73 while (wn>=5 && !(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) {
74 *ws++ = *s++;
75 *ws++ = *s++;
76 *ws++ = *s++;
77 *ws++ = *s++;
78 wn -= 4;
79 }
80 }
81 if (*s-1u < 0x7f) {
82 *ws++ = *s++;
83 wn--;
84 continue;
85 }
86 if (*s-SA > SB-SA) break;
87 c = bittab[*s++-SA];
88resume:
89 if (OOB(c,*s)) { s--; break; }
90 c = (c<<6) | *s++-0x80;
91 if (c&(1U<<31)) {
92 if (*s-0x80u >= 0x40) { s-=2; break; }
93 c = (c<<6) | *s++-0x80;
94 if (c&(1U<<31)) {
95 if (*s-0x80u >= 0x40) { s-=3; break; }
96 c = (c<<6) | *s++-0x80;
97 }
98 }
99 *ws++ = c;
100 wn--;
101 c = 0;
102 }
103
104 if (!c && !*s) {
105 if (ws) {
106 *ws = 0;
107 *src = 0;
108 }
109 return wn0-wn;
110 }
111 errno = EILSEQ;
112 if (ws) *src = (const void *)s;
113 return -1;
114}
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