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+# SED script for preprocessing embedded headers from source 
+# (S. Chamberlain markup)
+# middle pass; most of the work is done here.
+#
+# First, get rid of /*proto* markers; they've done their job in the first pass.
+# (They remain comment-introducers)
+/^\/\*proto\*/s/^\/\*proto\*/\/*/
+/^\/\*proto-internal\*/s/^\/\*proto-internal\*/\/*/
+#
+# *-*/ is an alternative (older) comment-block end.  Remap for uniformity:
+s/^\*-\*\//\*\//
+#
+# {* and *} are standins for comment markers (originally embedded in .c 
+# comments)---turn into real comment markers:
+s/{\*/\/\*/
+s/\*}/\*\//
+#
+# '*+++' and '*---' span a block of text that includes both header lines 
+# (marked by leading '$') and explanatory text (to be comments).
+# No need to start comment at "*+++", or end it at "*---", since we're 
+# already in a *proto* comment block.  Just delete.
+/\*\+\+\+/d
+/\*---/d
+#
+# Any line beginning with '$' is made a line of code in the header; 
+#  stuff in between is comments, so *precede* each '$' line with 
+#  END-comment, *follow* each '$' line with START-comment; third pass later 
+#  eliminates empty comment blocks.
+/^\$/i\
+*/
+/^\$/a\
+/*
+#
+# Now delete the '$' markers themselves:
+/^\$/s/\$//
+#
+# *+ and *- delimit larger blocks of code, treated the same as '$' lines
+/^\*\+$/c\
+*/
+/^\*-$/c\
+/*
+#
+# '*;' introduces code which may have a single line or multiple lines;
+# it extends until the next semicolon (which is also printed).
+#
+# One-line case: (do this first; else second line address for multi-line case
+# will include random text til we happen to end a line in a proto comment with
+# a semicolon)
+/^\*;.*;$/{
+s/^\*;/*\/\
+/
+s/;$/;\
+\/*\
+/
+}
+# Multi-line case:
+/^\*;/,/.*;$/{
+s/^\*;/*\/\
+/
+s/;$/;\
+\/*\
+/
+}