STRCAT
Section: POSIX Programmer's Manual (3P)
Updated: 2017
Page Index
PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
strcat
--- concatenate two strings
SYNOPSIS
#include <string.h>
char *strcat(char *restrict s1, const char *restrict s2);
DESCRIPTION
The functionality described on this reference page is aligned with the
ISO C standard. Any conflict between the requirements described here and the
ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C standard.
The
strcat()
function shall append a copy of the string pointed to by
s2
(including the terminating NUL character) to the end of the string pointed
to by
s1.
The initial byte of
s2
overwrites the NUL character at the end of
s1.
If copying takes place between objects that overlap, the behavior is
undefined.
RETURN VALUE
The
strcat()
function shall return
s1;
no return value is reserved to indicate an error.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
This version is aligned with the ISO C standard; this does not affect
compatibility with XPG3 applications. Reliable error detection by this
function was never guaranteed.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
strncat()
The Base Definitions volume of POSIX.1-2017,
<string.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .