1STRSTR(3) Linux Programmer's Manual STRSTR(3)
2
3
4
6 strstr, strcasestr - locate a substring
7
9 #include <string.h>
10
11 char *strstr(const char *haystack, const char *needle);
12
13 #define _GNU_SOURCE /* See feature_test_macros(7) */
14
15 #include <string.h>
16
17 char *strcasestr(const char *haystack, const char *needle);
18
20 The strstr() function finds the first occurrence of the substring nee‐
21 dle in the string haystack. The terminating null bytes ('\0') are not
22 compared.
23
24 The strcasestr() function is like strstr(), but ignores the case of
25 both arguments.
26
28 These functions return a pointer to the beginning of the located sub‐
29 string, or NULL if the substring is not found.
30
32 For an explanation of the terms used in this section, see
33 attributes(7).
34
35 ┌─────────────┬───────────────┬────────────────┐
36 │Interface │ Attribute │ Value │
37 ├─────────────┼───────────────┼────────────────┤
38 │strstr() │ Thread safety │ MT-Safe │
39 ├─────────────┼───────────────┼────────────────┤
40 │strcasestr() │ Thread safety │ MT-Safe locale │
41 └─────────────┴───────────────┴────────────────┘
43 strstr(): POSIX.1-2001, POSIX.1-2008, C89, C99.
44
45 The strcasestr() function is a nonstandard extension.
46
48 index(3), memchr(3), memmem(3), rindex(3), strcasecmp(3), strchr(3),
49 string(3), strpbrk(3), strsep(3), strspn(3), strtok(3), wcsstr(3)
50
52 This page is part of release 4.16 of the Linux man-pages project. A
53 description of the project, information about reporting bugs, and the
54 latest version of this page, can be found at
55 https://www.kernel.org/doc/man-pages/.
56
57
58
59GNU 2017-09-15 STRSTR(3)