strstr
Section: C Library Functions (3)
Updated: 2023-02-05
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NAME
strstr, strcasestr - locate a substring
LIBRARY
Standard C library
(libc, -lc)
SYNOPSIS
#include <string.h>
char *strstr(const char *haystack, const char *needle);
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <string.h>
char *strcasestr(const char *haystack, const char *needle);
DESCRIPTION
The
strstr()
function finds the first occurrence of the substring
needle
in the string
haystack.
The terminating null bytes ('\0') are not compared.
The
strcasestr()
function is like
strstr(),
but ignores the case of both arguments.
RETURN VALUE
These functions return a pointer to the beginning of the
located substring, or NULL if the substring is not found.
If
needle
is the empty string,
the return value is always
haystack
itself.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
strstr()
| Thread safety | MT-Safe
|
|
strcasestr()
| Thread safety | MT-Safe locale
|
STANDARDS
strstr():
POSIX.1-2001, POSIX.1-2008, C99.
The
strcasestr()
function is a nonstandard extension.
SEE ALSO
memchr(3),
memmem(3),
strcasecmp(3),
strchr(3),
string(3),
strpbrk(3),
strsep(3),
strspn(3),
strtok(3),
wcsstr(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- SEE ALSO
-
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