1STRNCMP(3P)                POSIX Programmer's Manual               STRNCMP(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

13       strncmp — compare part of two strings
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SYNOPSIS

16       #include <string.h>
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18       int strncmp(const char *s1, const char *s2, size_t n);
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DESCRIPTION

21       The functionality described on this reference page is aligned with  the
22       ISO C  standard.  Any  conflict between the requirements described here
23       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
24       defers to the ISO C standard.
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26       The  strncmp() function shall compare not more than n bytes (bytes that
27       follow a NUL character are not compared) from the array pointed  to  by
28       s1 to the array pointed to by s2.
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30       The  sign  of  a non-zero return value is determined by the sign of the
31       difference between the values of the first pair of bytes  (both  inter‐
32       preted  as  type  unsigned  char) that differ in the strings being com‐
33       pared.
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RETURN VALUE

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

42       No errors are defined.
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44       The following sections are informative.
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EXAMPLES

47       None.
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APPLICATION USAGE

50       None.
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RATIONALE

53       None.
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FUTURE DIRECTIONS

56       None.
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SEE ALSO

59       strcmp()
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61       The Base Definitions volume of POSIX.1‐2008, <string.h>
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64       Portions  of  this text are reprinted and reproduced in electronic form
65       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
66       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
67       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
68       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
69       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
70       event of any discrepancy between this version and the original IEEE and
71       The Open Group Standard, the original IEEE and The Open Group  Standard
72       is  the  referee document. The original Standard can be obtained online
73       at http://www.unix.org/online.html .
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75       Any typographical or formatting errors that appear  in  this  page  are
76       most likely to have been introduced during the conversion of the source
77       files to man page format. To report such errors,  see  https://www.ker‐
78       nel.org/doc/man-pages/reporting_bugs.html .
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82IEEE/The Open Group                  2013                          STRNCMP(3P)
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