Initial population.

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+\documentclass{article}
+\usepackage{axiom}
+\begin{document}
+\title{\$SPAD/src/extent}
+\author{The Axiom Team}
+\maketitle
+\begin{abstract}
+\end{abstract}
+\eject
+\tableofcontents
+\eject
+\section{extent.h}
+<<extent.h>>=
+<<license>>
+#ifndef _EXTENT_H_
+#define _EXTENT_H_ 1
+
+#include "axiom-c-macros.h"
+#include "hyper.h"
+
+/*
+ * This file contains global macros extern declarations for the extent
+ * computation routines found in extent1.c and extent2.c.
+ */
+
+/*
+ * Definitions of standard text formatting dimensions, etc.
+ *  dimensions given in pixels
+ */
+
+#define left_margin 20
+#define non_scroll_right_margin_space 20
+#define scroll_right_margin_space 40
+#define bottom_margin 15
+#define top_margin 5
+#define scroll_top_margin top_margin
+#define scrollingTopMargin 5
+#define inter_line_space 5
+#define inter_word_space 5
+#define term_punct_space 5
+#define paragraph_space 30
+#define box_space 3
+#define horiz_line_space 3
+#define spadcom_indent 30
+#define min_inter_column_space 10
+#define box_width 3
+#define dash_width 5
+#define dash_y	   4
+
+
+/* next two from display.h. Reorg! */
+
+extern short int gDisplayRegion;
+extern int gRegionOffset;
+
+#define not_in_scroll (!(gDisplayRegion == Scrolling))
+
+#define visible(y, h) \
+  (not_in_scroll  || ((y) + gRegionOffset + gWindow->page->scroll_off \
+		  <= gWindow->scrollheight   && \
+		  (y) + gRegionOffset + gWindow->page->scroll_off - (h) >=  0))
+
+#define pix_visible(y, h) \
+  (not_in_scroll  || ((y) + gRegionOffset + gWindow->page->scroll_off - h +  \
+		   line_height	< gWindow->page->bot_scroll_margin  \
+		      - gWindow->page->top_scroll_margin  && \
+		  (y) + gRegionOffset + gWindow->page->scroll_off >=  0))
+
+#define above(y) ((y) +	 gWindow->page->scroll_off < gWindow->page->top_scroll_margin)
+#define below(y) ((y) + gWindow->page->scroll_off >= gWindow->page->bot_scroll_margin)
+
+
+/* Variables for the formatting state */
+
+extern int right_margin_space;
+extern int right_margin;
+extern int indent;
+extern int item_indent;
+extern int text_x;
+extern int text_y;
+extern int y_off;
+extern int scroll_bot;
+extern int need_scroll_up_button;
+extern int need_scroll_down_button;
+extern int item_space;
+extern int present_line_height;
+extern int past_line_height;
+extern int line_height;		       /* space between lines		   */
+extern int normal_text_height;	       /* space between lines		   */
+extern int space_width;		       /* the maximum width of a character */
+extern int word_off_height;	       /* the diff between text height and */
+
+
+/*
+ * externs from extent1.c
+ */
+
+extern short int gExtentRegion;
+
+extern short int gInAxiomCommand;     /* true iff we are in a \spadcommand */
+extern short int gInDesc;
+extern short int gInItem;	 /* true iff we are in a \item */
+extern short int gInLine;	 /* true iff there have been words printed  */
+extern short int gInTable;
+
+extern TextNode *gLineNode;
+
+#endif
+@
+\section{License}
+<<license>>=
+/*
+Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    - Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    - Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in
+      the documentation and/or other materials provided with the
+      distribution.
+
+    - Neither the name of The Numerical ALgorithms Group Ltd. nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+@
+<<*>>=
+<<license>>
+@ 
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}
+
+
+
+