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-%D \module
-%D   [       file=syst-con,
-%D        version=2000.12.10, % actually very old -)
-%D          title=\CONTEXT\ System Macros,
-%D       subtitle=Conversions,
-%D         author=Hans Hagen,
-%D           date=\currentdate,
-%D      copyright={PRAGMA / Hans Hagen \& Ton Otten}]
-%C
-%C This module is part of the \CONTEXT\ macro||package and is
-%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
-%C details.
-
-\writestatus{loading}{Context System Macro's / Conversions}
-
-\unprotect
-
-%D When the number of conversions grew, it did no longer make
-%D sense to spread them over multiple files. So, instead of
-%D defining these in \type {font-ini}, we now have a dedicated
-%D module.
-
-\catcode127=12 % other, just to be sure
-
-%D \macros
-%D   {lchexnumber,uchexnumber,lchexnumbers,uchexnumbers}
-%D
-%D In addition to the uppercase hex conversion, as needed in
-%D math families, we occasionally need a lowercase one, for
-%D instance when we want to compose gbsong fontnames.
-%D
-%D The ugly indirectness is needed to get rid of \TEX\
-%D induced spaces and \type {\relax}'s.
-%D
-%D \starttyping
-%D [\uchexnumber{0}]
-%D [\uchexnumber\scratchcounter]
-%D [\uchexnumber\zerocount]
-%D [\uchexnumber{\number0}]
-%D [\uchexnumber{\number\scratchcounter}]
-%D [\uchexnumber{\number\zerocount}]
-%D [\uchexnumber{\the\scratchcounter}]
-%D [\uchexnumber{\the\zerocount}]
-%D [\expandafter\uchexnumber\expandafter{\number0}]
-%D [\expandafter\uchexnumber\expandafter{\number\scratchcounter}]
-%D [\expandafter\uchexnumber\expandafter{\number\zerocount}]
-%D [\expandafter\uchexnumber\expandafter{\the\scratchcounter}]
-%D [\expandafter\uchexnumber\expandafter{\the\zerocount}]
-%D \stoptyping
-
-\let\lchexnumber \gobbleoneargument
-\let\uchexnumber \gobbleoneargument
-\let\lchexnumbers\gobbleoneargument
-\let\uchexnumbers\gobbleoneargument
-
-%D \macros
-%D   {octnumber}
-%D
-%D For unicode remapping purposes, we need octal numbers.
-
-\let\octnumber\gobbleoneargument
-
-%D \macros
-%D   {hexstringtonumber}
-%D
-%D This macro converts a two character hexadecimal number into
-%D a decimal number, thereby taking care of lowercase characters
-%D as well.
-
-\let\hexstringtonumber\gobbleoneargument
-
-%D \macros
-%D   {rawcharacter}
-%D
-%D This macro can be used to produce proper 8 bit characters
-%D that we sometimes need in backends and round||trips.
-
-\let\rawcharacter\gobbleoneargument
-
-%D \macros
-%D   {twodigits, threedigits}
-%D
-%D These macros provides two or three digits always:
-
-\def\twodigits  #1{\ifnum             #1<10     0\fi\number#1}
-\def\threedigits#1{\ifnum#1<100 \ifnum#1<10 0\fi0\fi\number#1}
-
-%D \macros{modulonumber}
-%D
-%D In the conversion macros described in \type {core-con} we
-%D need a wrap||around method. The following solution is
-%D provided by Taco.
-%D
-%D The \type {modulonumber} macro expands to the mathematical
-%D modulo of a positive integer. It is crucial for it's
-%D application that this macro is fully exandable.
-%D
-%D The expression inside the \type {\numexpr} itself is
-%D somewhat bizarre because \ETEX\ uses a rounding
-%D division instead of truncation. If \ETEX's division
-%D would have behaved like \TEX's normal\type{\divide}, then
-%D the expression could have been somewhat simpler, like
-%D \type {#2-(#2/#1)*#1}. This works just as well, but a bit
-%D more complex.
-
-\beginETEX
-
-\def\modulonumber#1#2%
-   {\the\numexpr#2-((((#2+(#1/2))/#1)-1)*#1)\relax}
-
-\endETEX
-
-%D \macros{modulatednumber}
-%D
-%D Modulo numbers run from zero to one less than the limit,
-%D but for conversion sets, we need a value between 1 and the
-%D limit. The \type{\modulatednumber} arranges that. This
-%D macro also needs to be fully expandable, resulting in
-%D two \type{\numexpr}s.
-
-\beginETEX
-
-\def\modulatednumber#1#2%
-  {\ifnum\the\numexpr\modulonumber{#1}{#2}\relax=0 #1%
-   \else \the\numexpr\modulonumber{#1}{#2}\relax  \fi}
-
-\endETEX
-
-%D When not running \ETEX\ you're left with the maximum:
-
-\beginTEX
-
-\def\modulatednumber#1#2%
-  {\ifnum#2>#1 #1\else#2\fi}
-
-\endTEX
-
-%D Plugins
-
-\loadmarkfile{syst-con}
-
-\let\hexnumber\uchexnumber
-
-\protect \endinput