NetBSD-5.0.2/dist/nvi/vi/v_left.c
/* $NetBSD: v_left.c,v 1.1.1.2 2008/05/18 14:31:42 aymeric Exp $ */
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "Id: v_left.c,v 10.9 2001/06/25 15:19:32 skimo Exp (Berkeley) Date: 2001/06/25 15:19:32";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <limits.h>
#include <stdio.h>
#include "../common/common.h"
#include "vi.h"
/*
* v_left -- [count]^H, [count]h
* Move left by columns.
*
* PUBLIC: int v_left __P((SCR *, VICMD *));
*/
int
v_left(SCR *sp, VICMD *vp)
{
db_recno_t cnt;
/*
* !!!
* The ^H and h commands always failed in the first column.
*/
if (vp->m_start.cno == 0) {
v_sol(sp);
return (1);
}
/* Find the end of the range. */
cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
if (vp->m_start.cno > cnt)
vp->m_stop.cno = vp->m_start.cno - cnt;
else
vp->m_stop.cno = 0;
/*
* All commands move to the end of the range. Motion commands
* adjust the starting point to the character before the current
* one.
*/
if (ISMOTION(vp))
--vp->m_start.cno;
vp->m_final = vp->m_stop;
return (0);
}
/*
* v_cfirst -- [count]_
* Move to the first non-blank character in a line.
*
* PUBLIC: int v_cfirst __P((SCR *, VICMD *));
*/
int
v_cfirst(SCR *sp, VICMD *vp)
{
db_recno_t cnt, lno;
/*
* !!!
* If the _ is a motion component, it makes the command a line motion
* e.g. "d_" deletes the line. It also means that the cursor doesn't
* move.
*
* The _ command never failed in the first column.
*/
if (ISMOTION(vp))
F_SET(vp, VM_LMODE);
/*
* !!!
* Historically a specified count makes _ move down count - 1
* rows, so, "3_" is the same as "2j_".
*/
cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
if (cnt != 1) {
--vp->count;
return (v_down(sp, vp));
}
/*
* Move to the first non-blank.
*
* Can't just use RCM_SET_FNB, in case _ is used as the motion
* component of another command.
*/
vp->m_stop.cno = 0;
if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
return (1);
/*
* !!!
* The _ command has to fail if the file is empty and we're doing
* a delete. If deleting line 1, and 0 is the first nonblank,
* make the check.
*/
if (vp->m_stop.lno == 1 &&
vp->m_stop.cno == 0 && ISCMD(vp->rkp, 'd')) {
if (db_last(sp, &lno))
return (1);
if (lno == 0) {
v_sol(sp);
return (1);
}
}
/*
* Delete and non-motion commands move to the end of the range,
* yank stays at the start. Ignore others.
*/
vp->m_final =
ISMOTION(vp) && ISCMD(vp->rkp, 'y') ? vp->m_start : vp->m_stop;
return (0);
}
/*
* v_first -- ^
* Move to the first non-blank character in this line.
*
* PUBLIC: int v_first __P((SCR *, VICMD *));
*/
int
v_first(SCR *sp, VICMD *vp)
{
/*
* !!!
* Yielding to none in our quest for compatibility with every
* historical blemish of vi, no matter how strange it might be,
* we permit the user to enter a count and then ignore it.
*/
/*
* Move to the first non-blank.
*
* Can't just use RCM_SET_FNB, in case ^ is used as the motion
* component of another command.
*/
vp->m_stop.cno = 0;
if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
return (1);
/*
* !!!
* The ^ command succeeded if used as a command when the cursor was
* on the first non-blank in the line, but failed if used as a motion
* component in the same situation.
*/
if (ISMOTION(vp) && vp->m_start.cno == vp->m_stop.cno) {
v_sol(sp);
return (1);
}
/*
* If moving right, non-motion commands move to the end of the range.
* Delete and yank stay at the start. Motion commands adjust the
* ending point to the character before the current ending charcter.
*
* If moving left, all commands move to the end of the range. Motion
* commands adjust the starting point to the character before the
* current starting character.
*/
if (vp->m_start.cno < vp->m_stop.cno)
if (ISMOTION(vp)) {
--vp->m_stop.cno;
vp->m_final = vp->m_start;
} else
vp->m_final = vp->m_stop;
else {
if (ISMOTION(vp))
--vp->m_start.cno;
vp->m_final = vp->m_stop;
}
return (0);
}
/*
* v_ncol -- [count]|
* Move to column count or the first column on this line. If the
* requested column is past EOL, move to EOL. The nasty part is
* that we have to know character column widths to make this work.
*
* PUBLIC: int v_ncol __P((SCR *, VICMD *));
*/
int
v_ncol(SCR *sp, VICMD *vp)
{
if (F_ISSET(vp, VC_C1SET) && vp->count > 1) {
--vp->count;
vp->m_stop.cno =
vs_colpos(sp, vp->m_start.lno, (size_t)vp->count);
/*
* !!!
* The | command succeeded if used as a command and the cursor
* didn't move, but failed if used as a motion component in the
* same situation.
*/
if (ISMOTION(vp) && vp->m_stop.cno == vp->m_start.cno) {
v_nomove(sp);
return (1);
}
} else {
/*
* !!!
* The | command succeeded if used as a command in column 0
* without a count, but failed if used as a motion component
* in the same situation.
*/
if (ISMOTION(vp) && vp->m_start.cno == 0) {
v_sol(sp);
return (1);
}
vp->m_stop.cno = 0;
}
/*
* If moving right, non-motion commands move to the end of the range.
* Delete and yank stay at the start. Motion commands adjust the
* ending point to the character before the current ending charcter.
*
* If moving left, all commands move to the end of the range. Motion
* commands adjust the starting point to the character before the
* current starting character.
*/
if (vp->m_start.cno < vp->m_stop.cno)
if (ISMOTION(vp)) {
--vp->m_stop.cno;
vp->m_final = vp->m_start;
} else
vp->m_final = vp->m_stop;
else {
if (ISMOTION(vp))
--vp->m_start.cno;
vp->m_final = vp->m_stop;
}
return (0);
}
/*
* v_zero -- 0
* Move to the first column on this line.
*
* PUBLIC: int v_zero __P((SCR *, VICMD *));
*/
int
v_zero(SCR *sp, VICMD *vp)
{
/*
* !!!
* The 0 command succeeded if used as a command in the first column
* but failed if used as a motion component in the same situation.
*/
if (ISMOTION(vp) && vp->m_start.cno == 0) {
v_sol(sp);
return (1);
}
/*
* All commands move to the end of the range. Motion commands
* adjust the starting point to the character before the current
* one.
*/
vp->m_stop.cno = 0;
if (ISMOTION(vp))
--vp->m_start.cno;
vp->m_final = vp->m_stop;
return (0);
}