/*	$OpenBSD: vs_relative.c,v 1.9 2014/11/12 04:28:41 bentley Exp $	*/

/*-

 * Copyright (c) 1993, 1994

 *	The Regents of the University of California.  All rights reserved.

 * Copyright (c) 1993, 1994, 1995, 1996

 *	Keith Bostic.  All rights reserved.

 *

 * See the LICENSE file for redistribution information.

 */

#include "config.h"

#include <sys/types.h>

#include <sys/queue.h>

#include <sys/time.h>

#include <bitstring.h>

#include <limits.h>

#include <stdio.h>

#include <string.h>

#include "../common/common.h"

#include "vi.h"

/*

 * vs_column --

 *	Return the logical column of the cursor in the line.

 *

 * PUBLIC: int vs_column(SCR *, size_t *);

 */

int

vs_column(SCR *sp, size_t *colp)

{

	VI_PRIVATE *vip;

}

/*

 * vs_screens --

 *	Return the screens necessary to display the line, or if specified,

 *	the physical character column within the line, including space

 *	required for the O_NUMBER and O_LIST options.

 *

 * PUBLIC: size_t vs_screens(SCR *, recno_t, size_t *);

 */

size_t

vs_screens(SCR *sp, recno_t lno, size_t *cnop)

{

	size_t cols, screens;

	/* Left-right screens are simple, it's always 1. */

	/*

	 * Check for a cached value.  We maintain a cache because, if the

	 * line is large, this routine gets called repeatedly.  One other

	 * hack, lots of time the cursor is on column one, which is an easy

	 * one.

	 */

	/* Figure out how many columns the line/column needs. */

		screens = 1;

	/* Cache the value. */

	}

}

/*

 * vs_columns --

 *	Return the screen columns necessary to display the line, or,

 *	if specified, the physical character column within the line.

 *

 * PUBLIC: size_t vs_columns(SCR *, char *, recno_t, size_t *, size_t *);

 */

size_t

vs_columns(SCR *sp, char *lp, recno_t lno, size_t *cnop, size_t *diffp)

{

	int ch, leftright, listset;

	char *p;

	/*

	 * Initialize the screen offset.

	 */

	scno = 0;

	curoff = 0;

	/* Leading number if O_NUMBER option set. */

		scno += O_NUMBER_LENGTH;

		curoff += O_NUMBER_LENGTH;

	}

	/* Need the line to go any further. */

			goto done;

	}

	/* Missing or empty lines are easy. */

	}

	/* Store away the values of the list and leftright edit options. */

	/*

	 * Initialize the pointer into the buffer.

	 */

	/* Macro to return the display length of any signal character. */

#define	CHLEN(val) (ch = *(u_char *)p++) == '\t' &&			\

	    !listset ? TAB_OFF(val) : KEY_LEN(sp, ch);

	/*

	 * If folding screens (the historic vi screen format), past the end

	 * of the current screen, and the character was a tab, reset the

	 * current screen column to 0, and the total screen columns to the

	 * last column of the screen.  Otherwise, display the rest of the

	 * character in the next screen.

	 */

#define	TAB_RESET {							\

	curoff += chlen;						\

	if (!leftright && curoff >= sp->cols) {				\

		if (ch == '\t') {					\

			curoff = 0;					\

			scno -= scno % sp->cols;			\

		} else							\

			curoff -= sp->cols;				\

	}								\

}

			last = scno;

		}

	else

			last = scno;

				break;

		}

	/* Add the trailing '$' if the O_LIST option set. */

	/*

	 * The text input screen code needs to know how much additional

	 * room the last two characters required, so that it can handle

	 * tab character displays correctly.

	 */

}

/*

 * vs_rcm --

 *	Return the physical column from the line that will display a

 *	character closest to the currently most attractive character

 *	position (which is stored as a screen column).

 *

 * PUBLIC: size_t vs_rcm(SCR *, recno_t, int);

 */

size_t

vs_rcm(SCR *sp, recno_t lno, int islast)

{

	/* Last character is easy, and common. */

	}

	/* First character is easy, and common. */

}

/*

 * vs_colpos --

 *	Return the physical column from the line that will display a

 *	character closest to the specified screen column.

 *

 * PUBLIC: size_t vs_colpos(SCR *, recno_t, size_t);

 */

size_t

vs_colpos(SCR *sp, recno_t lno, size_t cno)

{

	int ch, leftright, listset;

	/* Need the line to go any further. */

	/* Missing or empty lines are easy. */

	/* Store away the values of the list and leftright edit options. */

	/* Discard screen (logical) lines. */

		/*

		 * If reached the end of the physical line, return the last

		 * physical character in the line.

		 */

		/*

		 * If folding screens (the historic vi screen format), past

		 * the end of the current screen, and the character was a tab,

		 * reset the current screen column to 0.  Otherwise, the rest

		 * of the character is displayed in the next screen.

		 */

		else

	}

	/* Step through the line until reach the right character or EOL. */

		/*

		 * If we've reached the specific character, there are three

		 * cases.

		 *

		 * 1: scno == cno, i.e. the current character ends at the

		 *    screen character we care about.

		 *	a: off < llen - 1, i.e. not the last character in

		 *	   the line, return the offset of the next character.

		 *	b: else return the offset of the last character.

		 * 2: scno != cno, i.e. this character overruns the character

		 *    we care about, return the offset of this character.

		 */

		}

	}

	/* No such character; return the start of the last character. */

}