NetBSD-5.0.2/dist/nvi/vi/v_paragraph.c
/* $NetBSD: v_paragraph.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_paragraph.c,v 10.10 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 <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../common/common.h"
#include "vi.h"
#define INTEXT_CHECK { \
if (len == 0 || v_isempty(p, len)) { \
if (!--cnt) \
goto found; \
pstate = P_INBLANK; \
} \
/* \
* !!! \
* Historic documentation (USD:15-11, 4.2) said that formfeed \
* characters (^L) in the first column delimited paragraphs. \
* The historic vi code mentions formfeed characters, but never \
* implements them. It seems reasonable, do it. \
*/ \
if (p[0] == '\014') { \
if (!--cnt) \
goto found; \
continue; \
} \
if (p[0] != '.' || len < 2) \
continue; \
for (lp = VIP(sp)->ps; *lp != '\0'; lp += 2) \
if (lp[0] == p[1] && \
((lp[1] == ' ' && len == 2) || lp[1] == p[2]) && \
!--cnt) \
goto found; \
}
/*
* v_paragraphf -- [count]}
* Move forward count paragraphs.
*
* Paragraphs are empty lines after text, formfeed characters, or values
* from the paragraph or section options.
*
* PUBLIC: int v_paragraphf __P((SCR *, VICMD *));
*/
int
v_paragraphf(SCR *sp, VICMD *vp)
{
enum { P_INTEXT, P_INBLANK } pstate;
size_t lastlen, len;
db_recno_t cnt, lastlno, lno;
int isempty;
CHAR_T *p;
char *lp;
/*
* !!!
* 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.
*
* This was historical practice in vi, with a single exception. If
* the paragraph movement was from the start of the last line to EOF,
* then all the characters were deleted from the last line, but the
* line itself remained. If somebody complains, don't pause, don't
* hesitate, just hit them.
*/
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);
}
}
/* Figure out what state we're currently in. */
lno = vp->m_start.lno;
if (db_get(sp, lno, 0, &p, &len))
goto eof;
/*
* If we start in text, we want to switch states
* (2 * N - 1) times, in non-text, (2 * N) times.
*/
cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
cnt *= 2;
if (len == 0 || v_isempty(p, len))
pstate = P_INBLANK;
else {
--cnt;
pstate = P_INTEXT;
}
for (;;) {
lastlno = lno;
lastlen = len;
if (db_get(sp, ++lno, 0, &p, &len))
goto eof;
switch (pstate) {
case P_INTEXT:
INTEXT_CHECK;
break;
case P_INBLANK:
if (len == 0 || v_isempty(p, len))
break;
if (--cnt) {
pstate = P_INTEXT;
break;
}
/*
* !!!
* Non-motion commands move to the end of the range,
* delete and yank stay at the start. Ignore others.
* Adjust the end of the range for motion commands;
* historically, a motion component was to the end of
* the previous line, whereas the movement command was
* to the start of the new "paragraph".
*/
found: if (ISMOTION(vp)) {
vp->m_stop.lno = lastlno;
vp->m_stop.cno = lastlen ? lastlen - 1 : 0;
vp->m_final = vp->m_start;
} else {
vp->m_stop.lno = lno;
vp->m_stop.cno = 0;
vp->m_final = vp->m_stop;
}
return (0);
default:
abort();
}
}
/*
* !!!
* Adjust end of the range for motion commands; EOF is a movement
* sink. The } command historically moved to the end of the last
* line, not the beginning, from any position before the end of the
* last line. It also historically worked on empty files, so we
* have to make it okay.
*/
eof: if (vp->m_start.lno == lno || vp->m_start.lno == lno - 1) {
if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
if (!isempty)
return (1);
vp->m_start.cno = 0;
return (0);
}
if (vp->m_start.cno == (len ? len - 1 : 0)) {
v_eof(sp, NULL);
return (1);
}
}
/*
* !!!
* Non-motion commands move to the end of the range, delete
* and yank stay at the start. Ignore others.
*
* If deleting the line (which happens if deleting to EOF), then
* cursor movement is to the first nonblank.
*/
if (ISMOTION(vp) && ISCMD(vp->rkp, 'd')) {
F_CLR(vp, VM_RCM_MASK);
F_SET(vp, VM_RCM_SETFNB);
}
vp->m_stop.lno = lno - 1;
vp->m_stop.cno = len ? len - 1 : 0;
vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
return (0);
}
/*
* v_paragraphb -- [count]{
* Move backward count paragraphs.
*
* PUBLIC: int v_paragraphb __P((SCR *, VICMD *));
*/
int
v_paragraphb(SCR *sp, VICMD *vp)
{
enum { P_INTEXT, P_INBLANK } pstate;
size_t len;
db_recno_t cnt, lno;
CHAR_T *p;
char *lp;
/*
* !!!
* Check for SOF. The historic vi didn't complain if users hit SOF
* repeatedly, unless it was part of a motion command. There is no
* question but that Emerson's editor of choice was vi.
*
* The { command historically moved to the beginning of the first
* line if invoked on the first line.
*
* !!!
* If the starting cursor position is in the first column (backward
* paragraph movements did NOT historically pay attention to non-blank
* characters) i.e. the movement is cutting the entire line, the buffer
* is in line mode. Cuts from the beginning of the line also did not
* cut the current line, but started at the previous EOL.
*
* Correct for a left motion component while we're thinking about it.
*/
lno = vp->m_start.lno;
if (ISMOTION(vp)) {
if (vp->m_start.cno == 0) {
if (vp->m_start.lno == 1) {
v_sof(sp, &vp->m_start);
return (1);
} else
--vp->m_start.lno;
F_SET(vp, VM_LMODE);
} else
--vp->m_start.cno;
}
if (vp->m_start.lno <= 1)
goto sof;
/* Figure out what state we're currently in. */
if (db_get(sp, lno, 0, &p, &len))
goto sof;
/*
* If we start in text, we want to switch states
* (2 * N - 1) times, in non-text, (2 * N) times.
*/
cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
cnt *= 2;
if (len == 0 || v_isempty(p, len))
pstate = P_INBLANK;
else {
--cnt;
pstate = P_INTEXT;
/*
* !!!
* If the starting cursor is past the first column,
* the current line is checked for a paragraph.
*/
if (vp->m_start.cno > 0)
++lno;
}
for (;;) {
if (db_get(sp, --lno, 0, &p, &len))
goto sof;
switch (pstate) {
case P_INTEXT:
INTEXT_CHECK;
break;
case P_INBLANK:
if (len != 0 && !v_isempty(p, len)) {
if (!--cnt)
goto found;
pstate = P_INTEXT;
}
break;
default:
abort();
}
}
/* SOF is a movement sink. */
sof: lno = 1;
found: vp->m_stop.lno = lno;
vp->m_stop.cno = 0;
/*
* All commands move to the end of the range. (We already
* adjusted the start of the range for motion commands).
*/
vp->m_final = vp->m_stop;
return (0);
}
/*
* v_buildps --
* Build the paragraph command search pattern.
*
* PUBLIC: int v_buildps __P((SCR *, const char *, const char *));
*/
int
v_buildps(SCR *sp, const char *p_p, const char *s_p)
{
VI_PRIVATE *vip;
size_t p_len, s_len;
char *p;
/*
* The vi paragraph command searches for either a paragraph or
* section option macro.
*/
p_len = p_p == NULL ? 0 : strlen(p_p);
s_len = s_p == NULL ? 0 : strlen(s_p);
if (p_len == 0 && s_len == 0)
return (0);
MALLOC_RET(sp, p, char *, p_len + s_len + 1);
vip = VIP(sp);
if (vip->ps != NULL)
free(vip->ps);
if (p_p != NULL)
memmove(p, p_p, p_len + 1);
if (s_p != NULL)
memmove(p + p_len, s_p, s_len + 1);
vip->ps = p;
return (0);
}