This source file includes following definitions.
- u8_check
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18 #include <config.h>
19
20
21 #include "unistr.h"
22
23 const uint8_t *
24 u8_check (const uint8_t *s, size_t n)
25 {
26 const uint8_t *s_end = s + n;
27
28 while (s < s_end)
29 {
30
31 uint8_t c = *s;
32
33 if (c < 0x80)
34 {
35 s++;
36 continue;
37 }
38 if (c >= 0xc2)
39 {
40 if (c < 0xe0)
41 {
42 if (s + 2 <= s_end
43 && (s[1] ^ 0x80) < 0x40)
44 {
45 s += 2;
46 continue;
47 }
48 }
49 else if (c < 0xf0)
50 {
51 if (s + 3 <= s_end
52 && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
53 && (c >= 0xe1 || s[1] >= 0xa0)
54 && (c != 0xed || s[1] < 0xa0))
55 {
56 s += 3;
57 continue;
58 }
59 }
60 else if (c < 0xf8)
61 {
62 if (s + 4 <= s_end
63 && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
64 && (s[3] ^ 0x80) < 0x40
65 && (c >= 0xf1 || s[1] >= 0x90)
66 && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)))
67 {
68 s += 4;
69 continue;
70 }
71 }
72 }
73
74 return s;
75 }
76 return NULL;
77 }