Add memelem and memrelem

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

1 files changed, 82 insertions, 0 deletions

diff --git a/man/libsimple_memrelem.3 b/man/libsimple_memrelem.3
new file mode 100644
index 0000000..77f5293
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+++ b/man/libsimple_memrelem.3
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+.TH LIBSIMPLE_MEMRELEM 3 2018-10-20 libsimple
+.SH NAME
+libsimple_memrelem \- find byte string in memory
+.SH SYNOPSIS
+.nf
+#include <libsimple.h>
+
+void *libsimple_memrelem(const void *haystack, size_t nhaystack, const void *needle, size_t nneedle);
+
+#ifndef memrelem
+# define memrelem libsimple_memrelem
+#endif
+.fi
+
+Link with
+.IR \-lsimple .
+.SH DESCRIPTION
+The
+.BR libsimple_memrelem ()
+function scans the memory segment
+.IR haystack ,
+with the size
+.IR nhaystack*nneedle ,
+for the last occurence of the byte string
+.I needle
+with the size
+.IR nneedle ,
+and with an offset equivalent to zero modulo
+.IR nneedle .
+.SH RETURN VALUE
+The
+.BR libsimple_memrelem ()
+function returns the pointer
+.I s
+with a maximal offset such that
+.IR !memcmp(r,needle,nneedle) ,
+where
+.I r
+is the returned pointer, and such that
+the offset is equivalent to zero modulo
+.IR nneedle .
+If no such offset exists,
+.B NULL
+is returned.
+.SH ERRORS
+The
+.BR libsimple_memrelem ()
+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_memrelem ()
+T}	Thread safety	MT-Safe
+T{
+.BR libsimple_memrelem ()
+T}	Async-signal safety	AS-Safe
+T{
+.BR libsimple_memrelem ()
+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_memelem (3),
+.BR libsimple_memrmem (3),
+.BR libsimple_memrchr (3)