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'\" et
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.TH MEMCMP "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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.SH NAME
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memcmp
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\(em compare bytes in memory
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.SH SYNOPSIS
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.LP
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.nf
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#include <string.h>
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.P
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int memcmp(const void *\fIs1\fP, const void *\fIs2\fP, size_t \fIn\fP);
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.fi
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.SH DESCRIPTION
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The functionality described on this reference page is aligned with the
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ISO\ C standard. Any conflict between the requirements described here and the
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ISO\ C standard is unintentional. This volume of POSIX.1\(hy2008 defers to the ISO\ C standard.
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.P
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The
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\fImemcmp\fR()
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function shall compare the first
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.IR n
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bytes (each interpreted as
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.BR "unsigned char" )
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of the object pointed to by
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.IR s1
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to the first
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.IR n
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bytes of the object pointed to by
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.IR s2 .
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.P
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The sign of a non-zero return value shall be determined by the sign of
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the difference between the values of the first pair of bytes (both
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interpreted as type
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.BR "unsigned char" )
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that differ in the objects being compared.
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.SH "RETURN VALUE"
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The
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\fImemcmp\fR()
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function shall return an integer greater than, equal to, or less than
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0, if the object pointed to by
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.IR s1
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is greater than, equal to, or less than the object pointed to by
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.IR s2 ,
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respectively.
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.SH ERRORS
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No errors are defined.
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.LP
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.IR "The following sections are informative."
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.SH EXAMPLES
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None.
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.SH "APPLICATION USAGE"
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None.
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.SH RATIONALE
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None.
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.SH "FUTURE DIRECTIONS"
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None.
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.SH "SEE ALSO"
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The Base Definitions volume of POSIX.1\(hy2008,
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.IR "\fB<string.h>\fP"
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 7, Copyright (C) 2013 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group.
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(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.unix.org/online.html .
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Any typographical or formatting errors that appear
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in this page are most likely
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to have been introduced during the conversion of the source files to
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man page format. To report such errors, see
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https://www.kernel.org/doc/man-pages/reporting_bugs.html .
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