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

12       strncmp — compare part of two strings
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SYNOPSIS

15       #include <string.h>
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17       int strncmp(const char *s1, const char *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  strncmp() function shall compare not more than n bytes (bytes that
26       follow a NUL character are not compared) from the array pointed  to  by
27       s1 to the array pointed to by s2.
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29       The  sign  of  a non-zero return value is determined by the sign of the
30       difference between the values of the first pair of bytes  (both  inter‐
31       preted  as  type  unsigned  char) that differ in the strings being com‐
32       pared.
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RETURN VALUE

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

41       No errors are defined.
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43       The following sections are informative.
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EXAMPLES

46       None.
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APPLICATION USAGE

49       None.
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RATIONALE

52       None.
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FUTURE DIRECTIONS

55       None.
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SEE ALSO

58       strcmp()
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60       The Base Definitions volume of POSIX.1‐2017, <string.h>
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63       Portions  of  this text are reprinted and reproduced in electronic form
64       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
65       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
66       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
67       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
68       event of any discrepancy between this version and the original IEEE and
69       The  Open Group Standard, the original IEEE and The Open Group Standard
70       is the referee document. The original Standard can be  obtained  online
71       at http://www.opengroup.org/unix/online.html .
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73       Any  typographical  or  formatting  errors that appear in this page are
74       most likely to have been introduced during the conversion of the source
75       files  to  man page format. To report such errors, see https://www.ker‐
76       nel.org/doc/man-pages/reporting_bugs.html .
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80IEEE/The Open Group                  2017                          STRNCMP(3P)
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