The strcat() function shall append a copy of the string pointed
to by s2 (including the terminating null byte) to
the end of the string pointed to by s1. The initial byte of
s2 overwrites the null byte at the end of s1. If
copying takes place between objects that overlap, the behavior is
The strcat() function shall return s1; no return value
is reserved to indicate an error.
No errors are defined.
The following sections are informative.
This issue is aligned with the ISO C standard; this does not affect
compatibility with XPG3 applications. Reliable error
detection by this function was never guaranteed.
strncat() , the Base Definitions volume of IEEE Std 1003.1-2001,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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