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
|
// SPDX-FileCopyrightText: 2024, Alejandro Colomar <alx@kernel.org>
// SPDX-License-Identifier: BSD-3-Clause
#ifndef SHADOW_INCLUDE_LIB_STRING_STRCMP_STRPREFIX_H_
#define SHADOW_INCLUDE_LIB_STRING_STRCMP_STRPREFIX_H_
#include "config.h"
#include <stddef.h>
#include <string.h>
#include "attr.h"
#include "cast.h"
// string prefix
#define strprefix(s, prefix) \
({ \
const char *p_; \
\
p_ = strprefix_(s, prefix); \
\
_Generic(s, \
const char *: p_, \
const void *: p_, \
char *: const_cast(char *, p_), \
void *: const_cast(char *, p_) \
); \
})
ATTR_STRING(1)
ATTR_STRING(2)
inline const char *strprefix_(const char *s, const char *prefix);
/*
* Return NULL if s does not start with prefix.
* Return `s + strlen(prefix)` if s starts with prefix.
*/
inline const char *
strprefix_(const char *s, const char *prefix)
{
if (strncmp(s, prefix, strlen(prefix)) != 0)
return NULL;
return s + strlen(prefix);
}
#endif // include guard
|
