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

       strncmp — compare part of two strings

SYNOPSIS

       #include <string.h>

       int strncmp(const char *s1, const char *s2, size_t n);

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  strncmp()  function  shall  compare  not  more  than n bytes (bytes that follow a NUL
       character are not compared) from the array pointed to by s1 to the array pointed to by s2.

       The sign of a non-zero return value is determined by the sign of  the  difference  between
       the values of the first pair of bytes (both interpreted as type unsigned char) that differ
       in the strings being compared.

RETURN VALUE

       Upon successful completion, strncmp() shall return an integer greater than, equal  to,  or
       less than 0, if the possibly null-terminated array pointed to by s1 is greater than, equal
       to, or less than the possibly null-terminated array pointed to by s2 respectively.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       strcmp()

       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 .