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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified Sat Jul 24 17:56:43 1993 by Rik Faith (faith@cs.unc.edu)
-.\" Added history, aeb, 980113.
-.\" 2005-05-05 mtk: added strcasestr()
-.\"
-.TH strstr 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-strstr, strcasestr \- locate a substring
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <string.h>
-.PP
-.BI "char *strstr(const char *" haystack ", const char *" needle );
-.PP
-.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
-.B #include <string.h>
-.PP
-.BI "char *strcasestr(const char *" haystack ", const char *" needle );
-.fi
-.SH DESCRIPTION
-The
-.BR strstr ()
-function finds the first occurrence of the substring
-.I needle
-in the string
-.IR haystack .
-The terminating null bytes (\[aq]\e0\[aq]) are not compared.
-.PP
-The
-.BR strcasestr ()
-function is like
-.BR strstr (),
-but ignores the case of both arguments.
-.SH RETURN VALUE
-These functions return a pointer to the beginning of the
-located substring, or NULL if the substring is not found.
-.PP
-If
-.I needle
-is the empty string,
-the return value is always
-.I haystack
-itself.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR strstr ()
-T}	Thread safety	MT-Safe
-T{
-.BR strcasestr ()
-T}	Thread safety	MT-Safe locale
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-.TP
-.BR strstr ()
-C11, POSIX.1-2008.
-.TP
-.BR strcasestr ()
-GNU.
-.SH HISTORY
-.TP
-.BR strstr ()
-POSIX.1-2001, C89.
-.TP
-.BR strcasestr ()
-GNU.
-.SH SEE ALSO
-.BR memchr (3),
-.BR memmem (3),
-.BR strcasecmp (3),
-.BR strchr (3),
-.BR string (3),
-.BR strpbrk (3),
-.BR strsep (3),
-.BR strspn (3),
-.BR strtok (3),
-.BR wcsstr (3)