298 lines
7.2 KiB
C
298 lines
7.2 KiB
C
/* $NetBSD: vs_relative.c,v 1.2 2008/12/05 22:51:43 christos Exp $ */
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/*-
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* Copyright (c) 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1993, 1994, 1995, 1996
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* Keith Bostic. All rights reserved.
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*
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* See the LICENSE file for redistribution information.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "Id: vs_relative.c,v 10.18 2001/07/08 13:02:48 skimo Exp (Berkeley) Date: 2001/07/08 13:02:48";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <bitstring.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include "../common/common.h"
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#include "vi.h"
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/*
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* vs_column --
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* Return the logical column of the cursor in the line.
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*
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* PUBLIC: int vs_column __P((SCR *, size_t *));
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*/
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int
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vs_column(SCR *sp, size_t *colp)
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{
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VI_PRIVATE *vip;
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vip = VIP(sp);
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*colp = (O_ISSET(sp, O_LEFTRIGHT) ?
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vip->sc_smap->coff : (vip->sc_smap->soff - 1) * sp->cols) +
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vip->sc_col - (O_ISSET(sp, O_NUMBER) ? O_NUMBER_LENGTH : 0);
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return (0);
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}
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/*
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* vs_screens --
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* Return the screens necessary to display the line, or if specified,
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* the physical character column within the line, including space
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* required for the O_NUMBER and O_LIST options.
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*
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* PUBLIC: size_t vs_screens __P((SCR *, db_recno_t, size_t *));
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*/
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size_t
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vs_screens(SCR *sp, db_recno_t lno, size_t *cnop)
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{
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size_t cols, screens;
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/* Left-right screens are simple, it's always 1. */
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if (O_ISSET(sp, O_LEFTRIGHT))
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return (1);
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/*
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* Check for a cached value. We maintain a cache because, if the
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* line is large, this routine gets called repeatedly. One other
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* hack, lots of time the cursor is on column one, which is an easy
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* one.
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*/
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if (cnop == NULL) {
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if (VIP(sp)->ss_lno == lno)
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return (VIP(sp)->ss_screens);
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} else if (*cnop == 0)
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return (1);
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/* Figure out how many columns the line/column needs. */
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cols = vs_columns(sp, NULL, lno, cnop, NULL);
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screens = (cols / sp->cols + (cols % sp->cols ? 1 : 0));
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if (screens == 0)
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screens = 1;
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/* Cache the value. */
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if (cnop == NULL) {
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VIP(sp)->ss_lno = lno;
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VIP(sp)->ss_screens = screens;
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}
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return (screens);
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}
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/*
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* vs_columns --
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* Return the screen columns necessary to display the line, or,
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* if specified, the physical character column within the line.
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*
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* PUBLIC: size_t vs_columns __P((SCR *, CHAR_T *, db_recno_t, size_t *, size_t *));
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*/
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size_t
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vs_columns(SCR *sp, CHAR_T *lp, db_recno_t lno, size_t *cnop, size_t *diffp)
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{
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size_t chlen, cno, curoff, last = 0, len, scno;
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int ch, leftright, listset;
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CHAR_T *p;
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/*
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* Initialize the screen offset.
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*/
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scno = 0;
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/* Leading number if O_NUMBER option set. */
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if (O_ISSET(sp, O_NUMBER))
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scno += O_NUMBER_LENGTH;
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/* Need the line to go any further. */
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if (lp == NULL) {
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(void)db_get(sp, lno, 0, &lp, &len);
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if (len == 0)
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goto done;
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}
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/* Missing or empty lines are easy. */
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if (lp == NULL) {
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done: if (diffp != NULL) /* XXX */
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*diffp = 0;
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return scno;
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}
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/* Store away the values of the list and leftright edit options. */
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listset = O_ISSET(sp, O_LIST);
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leftright = O_ISSET(sp, O_LEFTRIGHT);
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/*
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* Initialize the pointer into the buffer and current offset.
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*/
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p = lp;
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curoff = 0;
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/* Macro to return the display length of any signal character. */
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#define CHLEN(val) (ch = *(UCHAR_T *)p++) == '\t' && \
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!listset ? TAB_OFF(val) : KEY_COL(sp, ch);
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/*
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* If folding screens (the historic vi screen format), past the end
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* of the current screen, and the character was a tab, reset the
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* current screen column to 0, and the total screen columns to the
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* last column of the screen. Otherwise, display the rest of the
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* character in the next screen.
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*/
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#define TAB_RESET { \
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curoff += chlen; \
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if (!leftright && curoff >= sp->cols) { \
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if (ch == '\t') { \
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curoff = 0; \
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scno -= scno % sp->cols; \
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} else \
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curoff -= sp->cols; \
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} \
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}
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if (cnop == NULL)
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while (len--) {
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chlen = CHLEN(curoff);
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last = scno;
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scno += chlen;
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TAB_RESET;
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}
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else
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for (cno = *cnop;; --cno) {
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chlen = CHLEN(curoff);
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last = scno;
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scno += chlen;
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TAB_RESET;
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if (cno == 0)
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break;
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}
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/* Add the trailing '$' if the O_LIST option set. */
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if (listset && cnop == NULL)
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scno += KEY_LEN(sp, '$');
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/*
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* The text input screen code needs to know how much additional
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* room the last two characters required, so that it can handle
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* tab character displays correctly.
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*/
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if (diffp != NULL)
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*diffp = scno - last;
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return (scno);
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}
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/*
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* vs_rcm --
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* Return the physical column from the line that will display a
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* character closest to the currently most attractive character
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* position (which is stored as a screen column).
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*
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* PUBLIC: size_t vs_rcm __P((SCR *, db_recno_t, int));
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*/
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size_t
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vs_rcm(SCR *sp, db_recno_t lno, int islast)
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{
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size_t len;
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/* Last character is easy, and common. */
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if (islast) {
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if (db_get(sp, lno, 0, NULL, &len) || len == 0)
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return (0);
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return (len - 1);
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}
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/* First character is easy, and common. */
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if (sp->rcm == 0)
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return (0);
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return (vs_colpos(sp, lno, sp->rcm));
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}
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/*
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* vs_colpos --
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* Return the physical column from the line that will display a
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* character closest to the specified screen column.
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*
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* PUBLIC: size_t vs_colpos __P((SCR *, db_recno_t, size_t));
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*/
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size_t
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vs_colpos(SCR *sp, db_recno_t lno, size_t cno)
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{
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size_t chlen, curoff, len, llen, off, scno;
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int ch = 0, leftright, listset;
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CHAR_T *lp, *p;
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/* Need the line to go any further. */
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(void)db_get(sp, lno, 0, &lp, &llen);
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/* Missing or empty lines are easy. */
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if (lp == NULL || llen == 0)
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return (0);
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/* Store away the values of the list and leftright edit options. */
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listset = O_ISSET(sp, O_LIST);
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leftright = O_ISSET(sp, O_LEFTRIGHT);
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/* Discard screen (logical) lines. */
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off = cno / sp->cols;
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cno %= sp->cols;
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for (scno = 0, p = lp, len = llen; off--;) {
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for (; len && scno < sp->cols; --len)
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scno += CHLEN(scno);
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/*
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* If reached the end of the physical line, return the last
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* physical character in the line.
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*/
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if (len == 0)
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return (llen - 1);
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/*
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* If folding screens (the historic vi screen format), past
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* the end of the current screen, and the character was a tab,
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* reset the current screen column to 0. Otherwise, the rest
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* of the character is displayed in the next screen.
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*/
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if (leftright && ch == '\t')
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scno = 0;
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else
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scno -= sp->cols;
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}
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/* Step through the line until reach the right character or EOL. */
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for (curoff = scno; len--;) {
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chlen = CHLEN(curoff);
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/*
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* If we've reached the specific character, there are three
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* cases.
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*
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* 1: scno == cno, i.e. the current character ends at the
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* screen character we care about.
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* a: off < llen - 1, i.e. not the last character in
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* the line, return the offset of the next character.
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* b: else return the offset of the last character.
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* 2: scno != cno, i.e. this character overruns the character
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* we care about, return the offset of this character.
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*/
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if ((scno += chlen) >= cno) {
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off = p - lp;
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return (scno == cno ?
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(off < llen - 1 ? off : llen - 1) : off - 1);
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}
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TAB_RESET;
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}
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/* No such character; return the start of the last character. */
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return (llen - 1);
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}
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