1STRNCAT(3P)                POSIX Programmer's Manual               STRNCAT(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       strncat — concatenate a string with part of another
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SYNOPSIS

15       #include <string.h>
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17       char *strncat(char *restrict s1, const char *restrict s2, size_t n);
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DESCRIPTION

20       The functionality described on this reference page is aligned with  the
21       ISO C  standard.  Any  conflict between the requirements described here
22       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
23       defers to the ISO C standard.
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25       The  strncat() function shall append not more than n bytes (a NUL char‐
26       acter and bytes that follow it are not appended) from the array pointed
27       to  by  s2 to the end of the string pointed to by s1.  The initial byte
28       of s2 overwrites the NUL character at the end of s1.  A terminating NUL
29       character  is  always  appended  to  the result. If copying takes place
30       between objects that overlap, the behavior is undefined.
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RETURN VALUE

33       The strncat() function shall  return  s1;  no  return  value  shall  be
34       reserved to indicate an error.
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ERRORS

37       No errors are defined.
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39       The following sections are informative.
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EXAMPLES

42       None.
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APPLICATION USAGE

45       None.
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RATIONALE

48       None.
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FUTURE DIRECTIONS

51       None.
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SEE ALSO

54       strcat()
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56       The Base Definitions volume of POSIX.1‐2017, <string.h>
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59       Portions  of  this text are reprinted and reproduced in electronic form
60       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
61       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
62       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
63       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
64       event of any discrepancy between this version and the original IEEE and
65       The  Open Group Standard, the original IEEE and The Open Group Standard
66       is the referee document. The original Standard can be  obtained  online
67       at http://www.opengroup.org/unix/online.html .
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69       Any  typographical  or  formatting  errors that appear in this page are
70       most likely to have been introduced during the conversion of the source
71       files  to  man page format. To report such errors, see https://www.ker‐
72       nel.org/doc/man-pages/reporting_bugs.html .
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76IEEE/The Open Group                  2017                          STRNCAT(3P)
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