This source file includes following definitions.
- strcasestr
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18 #include <config.h>
19
20
21 #include <string.h>
22
23 #include <ctype.h>
24 #include <stdbool.h>
25 #include <strings.h>
26
27 #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
28
29
30 #define RETURN_TYPE char *
31 #define AVAILABLE(h, h_l, j, n_l) \
32 (!memchr ((h) + (h_l), '\0', (j) + (n_l) - (h_l)) \
33 && ((h_l) = (j) + (n_l)))
34 #define CANON_ELEMENT(c) TOLOWER (c)
35 #define CMP_FUNC(p1, p2, l) \
36 strncasecmp ((const char *) (p1), (const char *) (p2), l)
37 #include "str-two-way.h"
38
39
40
41
42 char *
43 strcasestr (const char *haystack_start, const char *needle_start)
44 {
45 const char *haystack = haystack_start;
46 const char *needle = needle_start;
47 size_t needle_len;
48 size_t haystack_len;
49 bool ok = true;
50
51
52
53
54 while (*haystack && *needle)
55 {
56 ok &= (TOLOWER ((unsigned char) *haystack)
57 == TOLOWER ((unsigned char) *needle));
58 haystack++;
59 needle++;
60 }
61 if (*needle)
62 return NULL;
63 if (ok)
64 return (char *) haystack_start;
65 needle_len = needle - needle_start;
66 haystack = haystack_start + 1;
67 haystack_len = needle_len - 1;
68
69
70
71
72 if (needle_len < LONG_NEEDLE_THRESHOLD)
73 return two_way_short_needle ((const unsigned char *) haystack,
74 haystack_len,
75 (const unsigned char *) needle_start,
76 needle_len);
77 return two_way_long_needle ((const unsigned char *) haystack, haystack_len,
78 (const unsigned char *) needle_start,
79 needle_len);
80 }
81
82 #undef LONG_NEEDLE_THRESHOLD