12  * Routines dealing with the "position" table.
13  * This is a table which tells the position (in the input file) of the
16  * {{ The position table is scrolled by moving all the entries.
22 #include "position.h"
24 static POSITION *table = NULL;  /* The position table */
32  * Return the starting file position of a line displayed on the screen.
40 public POSITION position(int sindex)  in position()  function
61  * Add a new file position to the bottom of the position table.
63 public void add_forw_pos(POSITION pos, lbool no_scroll)  in add_forw_pos()
68 	 * Scroll the position table up.  in add_forw_pos()
79  * Add a new file position to the top of the position table.
81 public void add_back_pos(POSITION pos)  in add_back_pos()
86 	 * Scroll the position table down.  in add_back_pos()
94  * Initialize the position table, done whenever we clear the screen.
105  * Allocate or reallocate the position table.
123 	table = (POSITION *) ecalloc((size_t) sc_height, sizeof(POSITION)); /*{{type-issue}}*/  in pos_init()
131  * See if the byte at a specified position is currently on the screen.
132  * Check the position table to see if the position falls within its range.
133  * Return the position table entry if found, -1 if not.
135 public int onscreen(POSITION pos)  in onscreen()
166  * Get the current screen position.
167  * The screen position consists of both a file position and
168  * a screen line number where the file position is placed on the screen.
199 	 * and return the screen line number and the file position.  in get_scrpos()
253 static int pos_shift(POSITION linepos, size_t choff)  in pos_shift()
257 	POSITION pos;  in pos_shift()
273  * Return the position of the first char of the line containing tpos.
276 static POSITION beginning_of_line(POSITION tpos)  in beginning_of_line()
294  * This function sets that entry to the position of the first char in the line,
299 	POSITION linepos;  in pos_rehead()
300 	POSITION tpos = table[TOP];  in pos_rehead()