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+.TH STRLEN 3 2018-11-05 libsimple
+.SH NAME
+STRLEN \- get the length of a string literal
+.SH SYNOPSIS
+.nf
+#include <libsimple.h>
+
+#ifndef STRLEN
+# define STRLEN(str) /* implementation omitted */
+#endif
+.fi
+.SH DESCRIPTION
+The
+.BR STRLEN ()
+macro assumes
+.I str
+is string literal
+.RB ( char
+array type) and expands the value of
+.I strlen(str)
+as a constant expression, that is, without
+calling
+.IR strlen ;
+however it is not suitable for
+.BR #if .
+The type of the expression the macro expands to is
+.BR size_t .
+.SH EXAMPLES
+None.
+.SH APPLICATION USAGE
+None.
+.SH RATIONALE
+None.
+.SH FUTURE DIRECTIONS
+None.
+.SH NOTES
+None.
+.SH BUGS
+None.
+.SH SEE ALSO
+.BR ELEMSOF (3libsimple)