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

12       memcmp — compare bytes in memory
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SYNOPSIS

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

35       The memcmp() function shall return an integer greater than,  equal  to,
36       or  less  than 0, if the object pointed to by s1 is greater than, equal
37       to, or less than the object pointed to by s2, respectively.
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ERRORS

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

45       None.
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APPLICATION USAGE

48       None.
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RATIONALE

51       None.
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FUTURE DIRECTIONS

54       None.
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SEE ALSO

57       The Base Definitions volume of POSIX.1‐2017, <string.h>
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60       Portions of this text are reprinted and reproduced in  electronic  form
61       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
62       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
63       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
64       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
65       event of any discrepancy between this version and the original IEEE and
66       The Open Group Standard, the original IEEE and The Open Group  Standard
67       is  the  referee document. The original Standard can be obtained online
68       at http://www.opengroup.org/unix/online.html .
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70       Any typographical or formatting errors that appear  in  this  page  are
71       most likely to have been introduced during the conversion of the source
72       files to man page format. To report such errors,  see  https://www.ker‐
73       nel.org/doc/man-pages/reporting_bugs.html .
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77IEEE/The Open Group                  2017                           MEMCMP(3P)
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