Add man pages

Signed-off-by: Mattias Andrée <maandree@kth.se>

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+.TH LIBSIMPLE_MEMCMOVE 3 2018-11-25 libsimple
+.SH NAME
+libsimple_memcmove \- move bytes within an array of bytes
+.SH SYNOPSIS
+.nf
+#include <libsimple.h>
+
+void *libsimple_memcmove(void *\fIdest\fP, const void *\fIsrc\fP, int \fIc\fP, size_t \fIn\fP);
+
+#ifndef memcmove
+# define memcmove libsimple_memcmove
+#endif
+.fi
+.PP
+Link with
+.IR \-lsimple .
+.SH DESCRIPTION
+The
+.BR libsimple_memcmove ()
+function moves
+.I n
+bytes from
+.I src
+to
+.IR dest .
+However the move stops after the character
+.I c
+(it is converted to a
+.BR char )
+is moved. The arrays may overlap in the.
+.PP
+The comparison is case-sensitive.
+.SH RETURN VALUE
+The
+.BR libsimple_memcmove ()
+function returns a pointer directly behind
+the position of the character
+.I c
+in
+.I dest
+after it was move, if the character
+.I c
+was not moved
+.I NULL
+is returned.
+.SH ERRORS
+The
+.BR libsimple_memcmove ()
+function cannot fail.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lb lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.BR libsimple_memcmove ()
+T}	Thread safety	MT-Safe
+T{
+.BR libsimple_memcmove ()
+T}	Async-signal safety	AS-Safe
+T{
+.BR libsimple_memcmove ()
+T}	Async-cancel safety	AC-Safe
+.TE
+.SH EXAMPLES
+None.
+.SH APPLICATION USAGE
+None.
+.SH RATIONALE
+None.
+.SH FUTURE DIRECTIONS
+None.
+.SH NOTES
+None.
+.SH BUGS
+None.
+.SH SEE ALSO
+.BR libsimple_rawmemcmove (3),
+.BR libsimple_mempmove (3),
+.BR libsimple_mempcpy (3),
+.BR libsimple_strcmove (3),
+.BR libsimple_strncmove (3),
+.BR libsimple_memelemmove (3),
+.BR memccpy (3),
+.BR memmove (3),
+.BR memcpy (3)