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+.TH LIBSIMPLE_STRNEQLEN 3 2018-10-23 libsimple
+.SH NAME
+libsimple_strneqlen \- check initial commonality
+.SH SYNOPSIS
+.nf
+#include <libsimple.h>
+
+size_t libsimple_strneqlen(const char *\fIa\fP, const char *\fIb\fP, size_t \fIn\fP);
+
+#ifndef strneqlen
+# define strneqlen libsimple_strneqlen
+#endif
+.fi
+.PP
+Link with
+.IR \-lsimple .
+.SH DESCRIPTION
+The
+.BR libsimple_strneqlen ()
+function scans the number of bytes the string
+.IR a ,
+truncated to
+.I n
+bytes unless it is shorter,
+have in common the string
+.IR b ,
+truncated to
+.I n
+bytes unless it is shorter,
+at their beginnings.
+.PP
+The comparison is case-sensitive.
+.SH RETURN VALUE
+The
+.BR libsimple_strneqlen ()
+function returns the number of bytes
+.I a
+and
+.I b
+(both truncated to
+.I n
+bytes) have in common at their beginnings.
+.SH ERRORS
+The
+.BR libsimple_strneqlen ()
+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_strneqlen ()
+T}	Thread safety	MT-Safe
+T{
+.BR libsimple_strneqlen ()
+T}	Async-signal safety	AS-Safe
+T{
+.BR libsimple_strneqlen ()
+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_streq (3),
+.BR libsimple_strreqlen (3),
+.BR libsimple_strcaseeqlen (3),
+.BR libsimple_streqlen (3),
+.BR libsimple_memeqlen (3)