1MEMCMP(3P)                 POSIX Programmer's Manual                MEMCMP(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       memcmp — compare bytes in memory
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SYNOPSIS

16       #include <string.h>
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18       int memcmp(const void *s1, const void *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 memcmp() function shall compare the first n bytes (each interpreted
27       as unsigned char) of the object pointed to by s1 to the first  n  bytes
28       of the object pointed to by s2.
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30       The  sign of a non-zero return value shall be determined by the sign of
31       the difference between the values of the  first  pair  of  bytes  (both
32       interpreted  as  type  unsigned  char) that differ in the objects being
33       compared.
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RETURN VALUE

36       The memcmp() function shall return an integer greater than,  equal  to,
37       or  less  than 0, if the object pointed to by s1 is greater than, equal
38       to, or less than the object 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       The Base Definitions volume of POSIX.1‐2008, <string.h>
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61       Portions of this text are reprinted and reproduced in  electronic  form
62       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
63       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
64       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
65       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
66       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
67       event of any discrepancy between this version and the original IEEE and
68       The  Open Group Standard, the original IEEE and The Open Group Standard
69       is the referee document. The original Standard can be  obtained  online
70       at http://www.unix.org/online.html .
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72       Any  typographical  or  formatting  errors that appear in this page are
73       most likely to have been introduced during the conversion of the source
74       files  to  man page format. To report such errors, see https://www.ker‐
75       nel.org/doc/man-pages/reporting_bugs.html .
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79IEEE/The Open Group                  2013                           MEMCMP(3P)
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