Lely core libraries  2.3.4
strings.c
Go to the documentation of this file.
1 
23 #include "libc.h"
24 #define LELY_LIBC_STRINGS_INLINE extern inline
25 #include <lely/libc/strings.h>
26 
27 #if !LELY_HAVE_STRINGS_H
28 
29 #include <ctype.h>
30 
31 #if !(defined(__GNUC__) || __has_builtin(__builtin_ffs))
32 
33 #include <stdint.h>
34 
35 // clang-format off
36 static const int ffs_tab[] = {
37  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
38  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
39  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
40  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
41  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
42  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
43  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
44  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
45  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
46  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
47  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
48  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
49  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
50  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
51  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
52  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8
53 };
54 // clang-format on
55 
56 int
57 ffs(int i)
58 {
59  // cppcheck-suppress oppositeExpression
60  unsigned int x = i & -i;
61  // clang-format off
62  unsigned int n = x > UINT32_C(0x00ffffff)
63  ? 24 : (x > UINT16_C(0xffffu)
64  ? 16 : (x > UINT8_C(0xff) ? 8 : 0));
65  // clang-format on
66  return n + ffs_tab[(x >> n) & UINT8_C(0xff)];
67 }
68 
69 #endif
70 
71 int
72 strcasecmp(const char *s1, const char *s2)
73 {
74  if (s1 == s2)
75  return 0;
76 
77  int result;
78  // clang-format off
79  while ((result = tolower((unsigned char)*s1)
80  - tolower((unsigned char)*s2++)) == 0 && *s1++)
81  // clang-format on
82  ;
83  return result;
84 }
85 
86 int
87 strncasecmp(const char *s1, const char *s2, size_t n)
88 {
89  if (s1 == s2 || !n)
90  return 0;
91 
92  int result;
93  // clang-format off
94  while ((result = tolower((unsigned char)*s1)
95  - tolower((unsigned char)*s2++)) == 0 && --n && *s1++)
96  // clang-format on
97  ;
98  return result;
99 }
100 
101 #endif // !LELY_HAVE_STRINGS_H
This is the internal header file of the C11 and POSIX compatibility library.
This header file is part of the C11 and POSIX compatibility library; it includes <stdint....
This header file is part of the C11 and POSIX compatibility library; it includes <strings....