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v_xchar.c revision 1.1 
      1 /*-
      2  * Copyright (c) 1992, 1993, 1994
      3  *	The Regents of the University of California.  All rights reserved.
      4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
      5  *	Keith Bostic.  All rights reserved.
      6  *
      7  * See the LICENSE file for redistribution information.
      8  */
      9 
     10 #include "config.h"
     11 
     12 #ifndef lint
     13 static const char sccsid[] = "Id: v_xchar.c,v 10.10 2001/06/25 15:19:36 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:36 ";
     14 #endif /* not lint */
     15 
     16 #include <sys/types.h>
     17 #include <sys/queue.h>
     18 #include <sys/time.h>
     19 
     20 #include <bitstring.h>
     21 #include <limits.h>
     22 #include <stdio.h>
     23 
     24 #include "../common/common.h"
     25 #include "vi.h"
     26 
     27 /*
     28  * v_xchar -- [buffer] [count]x
     29  *	Deletes the character(s) on which the cursor sits.
     30  *
     31  * PUBLIC: int v_xchar __P((SCR *, VICMD *));
     32  */
     33 int
     34 v_xchar(SCR *sp, VICMD *vp)
     35 {
     36 	size_t len;
     37 	int isempty;
     38 
     39 	if (db_eget(sp, vp->m_start.lno, NULL, &len, &isempty)) {
     40 		if (isempty)
     41 			goto nodel;
     42 		return (1);
     43 	}
     44 	if (len == 0) {
     45 nodel:		msgq(sp, M_BERR, "206|No characters to delete");
     46 		return (1);
     47 	}
     48 
     49 	/*
     50 	 * Delete from the cursor toward the end of line, w/o moving the
     51 	 * cursor.
     52 	 *
     53 	 * !!!
     54 	 * Note, "2x" at EOL isn't the same as "xx" because the left movement
     55 	 * of the cursor as part of the 'x' command isn't taken into account.
     56 	 * Historically correct.
     57 	 */
     58 	if (F_ISSET(vp, VC_C1SET))
     59 		vp->m_stop.cno += vp->count - 1;
     60 	if (vp->m_stop.cno >= len - 1) {
     61 		vp->m_stop.cno = len - 1;
     62 		vp->m_final.cno = vp->m_start.cno ? vp->m_start.cno - 1 : 0;
     63 	} else
     64 		vp->m_final.cno = vp->m_start.cno;
     65 
     66 	if (cut(sp,
     67 	    F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
     68 	    &vp->m_start, &vp->m_stop, 0))
     69 		return (1);
     70 	return (del(sp, &vp->m_start, &vp->m_stop, 0));
     71 }
     72 
     73 /*
     74  * v_Xchar -- [buffer] [count]X
     75  *	Deletes the character(s) immediately before the current cursor
     76  *	position.
     77  *
     78  * PUBLIC: int v_Xchar __P((SCR *, VICMD *));
     79  */
     80 int
     81 v_Xchar(SCR *sp, VICMD *vp)
     82 {
     83 	u_long cnt;
     84 
     85 	if (vp->m_start.cno == 0) {
     86 		v_sol(sp);
     87 		return (1);
     88 	}
     89 
     90 	cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
     91 	if (cnt >= vp->m_start.cno)
     92 		vp->m_start.cno = 0;
     93 	else
     94 		vp->m_start.cno -= cnt;
     95 	--vp->m_stop.cno;
     96 	vp->m_final.cno = vp->m_start.cno;
     97 
     98 	if (cut(sp,
     99 	    F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
    100 	    &vp->m_start, &vp->m_stop, 0))
    101 		return (1);
    102 	return (del(sp, &vp->m_start, &vp->m_stop, 0));
    103 }
    104