NetBSD-5.0.2/dist/nvi/vi/v_section.c
/* $NetBSD: v_section.c,v 1.1.1.2.6.1 2009/01/20 02:41:13 snj 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_section.c,v 10.10 2001/06/25 15:19:35 skimo Exp (Berkeley) Date: 2001/06/25 15:19:35";
#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 <string.h>
#include "../common/common.h"
#include "vi.h"
/*
* !!!
* In historic vi, the section commands ignored empty lines, unlike the
* paragraph commands, which was probably okay. However, they also moved
* to the start of the last line when there where no more sections instead
* of the end of the last line like the paragraph commands. I've changed
* the latter behavior to match the paragraph commands.
*
* In historic vi, a section was defined as the first character(s) of the
* line matching, which could be followed by anything. This implementation
* follows that historic practice.
*
* !!!
* The historic vi documentation (USD:15-10) claimed:
* The section commands interpret a preceding count as a different
* window size in which to redraw the screen at the new location,
* and this window size is the base size for newly drawn windows
* until another size is specified. This is very useful if you are
* on a slow terminal ...
*
* I can't get the 4BSD vi to do this, it just beeps at me. For now, a
* count to the section commands simply repeats the command.
*/
/*
* v_sectionf -- [count]]]
* Move forward count sections/functions.
*
* !!!
* Using ]] as a motion command was a bit special, historically. It could
* match } as well as the usual { and section values. If it matched a { or
* a section, it did NOT include the matched line. If it matched a }, it
* did include the line. No clue why.
*
* PUBLIC: int v_sectionf __P((SCR *, VICMD *));
*/
int
v_sectionf(SCR *sp, VICMD *vp)
{
db_recno_t cnt, lno;
size_t len;
CHAR_T *p;
const char *list, *lp;
/* Get the macro list. */
if ((list = O_STR(sp, O_SECTIONS)) == NULL)
return (1);
/*
* !!!
* If the starting cursor position is at or before any non-blank
* characters in the line, i.e. the movement is cutting all of the
* line's text, the buffer is in line mode. It's a lot easier to
* check here, because we know that the end is going to be the start
* or end of a line.
*/
if (ISMOTION(vp)) {
if (vp->m_start.cno == 0)
F_SET(vp, VM_LMODE);
else {
vp->m_stop = vp->m_start;
vp->m_stop.cno = 0;
if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
return (1);
if (vp->m_start.cno <= vp->m_stop.cno)
F_SET(vp, VM_LMODE);
}
}
cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
if (len == 0)
continue;
if (p[0] == '{' || (ISMOTION(vp) && p[0] == '}')) {
if (!--cnt) {
if (p[0] == '{')
goto adjust1;
goto adjust2;
}
continue;
}
/*
* !!!
* Historic documentation (USD:15-11, 4.2) said that formfeed
* characters (^L) in the first column delimited sections.
* The historic code mentions formfeed characters, but never
* implements them. Seems reasonable, do it.
*/
if (p[0] == '\014') {
if (!--cnt)
goto adjust1;
continue;
}
if (p[0] != '.' || len < 2)
continue;
for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
if (lp[0] == p[1] &&
((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
!--cnt) {
/*
* !!!
* If not cutting this line, adjust to the end
* of the previous one. Otherwise, position to
* column 0.
*/
adjust1: if (ISMOTION(vp))
goto ret1;
adjust2: vp->m_stop.lno = lno;
vp->m_stop.cno = 0;
goto ret2;
}
}
/* If moving forward, reached EOF, check to see if we started there. */
if (vp->m_start.lno == lno - 1) {
v_eof(sp, NULL);
return (1);
}
ret1: if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
return (1);
vp->m_stop.lno = lno;
vp->m_stop.cno = len ? len - 1 : 0;
/*
* Non-motion commands go to the end of the range. Delete and
* yank stay at the start of the range. Ignore others.
*/
ret2: if (ISMOTION(vp)) {
vp->m_final = vp->m_start;
if (F_ISSET(vp, VM_LMODE))
vp->m_final.cno = 0;
} else
vp->m_final = vp->m_stop;
return (0);
}
/*
* v_sectionb -- [count][[
* Move backward count sections/functions.
*
* PUBLIC: int v_sectionb __P((SCR *, VICMD *));
*/
int
v_sectionb(SCR *sp, VICMD *vp)
{
size_t len;
db_recno_t cnt, lno;
CHAR_T *p;
const char *list, *lp;
/* An empty file or starting from line 1 is always illegal. */
if (vp->m_start.lno <= 1) {
v_sof(sp, NULL);
return (1);
}
/* Get the macro list. */
if ((list = O_STR(sp, O_SECTIONS)) == NULL)
return (1);
cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
if (len == 0)
continue;
if (p[0] == '{') {
if (!--cnt)
goto adjust1;
continue;
}
/*
* !!!
* Historic documentation (USD:15-11, 4.2) said that formfeed
* characters (^L) in the first column delimited sections.
* The historic code mentions formfeed characters, but never
* implements them. Seems reasonable, do it.
*/
if (p[0] == '\014') {
if (!--cnt)
goto adjust1;
continue;
}
if (p[0] != '.' || len < 2)
continue;
for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
if (lp[0] == p[1] &&
((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
!--cnt) {
adjust1: vp->m_stop.lno = lno;
vp->m_stop.cno = 0;
goto ret1;
}
}
/*
* If moving backward, reached SOF, which is a movement sink.
* We already checked for starting there.
*/
vp->m_stop.lno = 1;
vp->m_stop.cno = 0;
/*
* All commands move to the end of the range.
*
* !!!
* Historic practice is the section cut was in line mode if it started
* from column 0 and was in the backward direction. Otherwise, left
* motion commands adjust the starting point to the character before
* the current one. What makes this worse is that if it cut to line
* mode it also went to the first non-<blank>.
*/
ret1: if (vp->m_start.cno == 0) {
F_CLR(vp, VM_RCM_MASK);
F_SET(vp, VM_RCM_SETFNB);
--vp->m_start.lno;
F_SET(vp, VM_LMODE);
} else
--vp->m_start.cno;
vp->m_final = vp->m_stop;
return (0);
}