NetBSD-5.0.2/dist/nvi/vi/v_itxt.c
/* $NetBSD: v_itxt.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_itxt.c,v 10.21 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 <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../common/common.h"
#include "vi.h"
/*
* !!!
* Repeated input in the historic vi is mostly wrong and this isn't very
* backward compatible. For example, if the user entered "3Aab\ncd" in
* the historic vi, the "ab" was repeated 3 times, and the "\ncd" was then
* appended to the result. There was also a hack which I don't remember
* right now, where "3o" would open 3 lines and then let the user fill them
* in, to make screen movements on 300 baud modems more tolerable. I don't
* think it's going to be missed.
*
* !!!
* There's a problem with the way that we do logging for change commands with
* implied motions (e.g. A, I, O, cc, etc.). Since the main vi loop logs the
* starting cursor position before the change command "moves" the cursor, the
* cursor position to which we return on undo will be where the user entered
* the change command, not the start of the change. Several of the following
* routines re-log the cursor to make this work correctly. Historic vi tried
* to do the same thing, and mostly got it right. (The only spectacular way
* it fails is if the user entered 'o' from anywhere but the last character of
* the line, the undo returned the cursor to the start of the line. If the
* user was on the last character of the line, the cursor returned to that
* position.) We also check for mapped keys waiting, i.e. if we're in the
* middle of a map, don't bother logging the cursor.
*/
#define LOG_CORRECT { \
if (!MAPPED_KEYS_WAITING(sp)) \
(void)log_cursor(sp); \
}
static u_int32_t set_txt_std __P((SCR *, VICMD *, u_int32_t));
/*
* v_iA -- [count]A
* Append text to the end of the line.
*
* PUBLIC: int v_iA __P((SCR *, VICMD *));
*/
int
v_iA(SCR *sp, VICMD *vp)
{
size_t len;
if (!db_get(sp, vp->m_start.lno, 0, NULL, &len))
sp->cno = len == 0 ? 0 : len - 1;
LOG_CORRECT;
return (v_ia(sp, vp));
}
/*
* v_ia -- [count]a
* [count]A
* Append text to the cursor position.
*
* PUBLIC: int v_ia __P((SCR *, VICMD *));
*/
int
v_ia(SCR *sp, VICMD *vp)
{
size_t len;
u_int32_t flags;
int isempty;
CHAR_T *p;
flags = set_txt_std(sp, vp, 0);
sp->showmode = SM_APPEND;
sp->lno = vp->m_start.lno;
/* Move the cursor one column to the right and repaint the screen. */
if (db_eget(sp, sp->lno, &p, &len, &isempty)) {
if (!isempty)
return (1);
len = 0;
LF_SET(TXT_APPENDEOL);
} else if (len) {
if (len == sp->cno + 1) {
sp->cno = len;
LF_SET(TXT_APPENDEOL);
} else
++sp->cno;
} else
LF_SET(TXT_APPENDEOL);
return (v_txt(sp, vp, NULL, p, len,
0, OOBLNO, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags));
}
/*
* v_iI -- [count]I
* Insert text at the first nonblank.
*
* PUBLIC: int v_iI __P((SCR *, VICMD *));
*/
int
v_iI(SCR *sp, VICMD *vp)
{
sp->cno = 0;
if (nonblank(sp, vp->m_start.lno, &sp->cno))
return (1);
LOG_CORRECT;
return (v_ii(sp, vp));
}
/*
* v_ii -- [count]i
* [count]I
* Insert text at the cursor position.
*
* PUBLIC: int v_ii __P((SCR *, VICMD *));
*/
int
v_ii(SCR *sp, VICMD *vp)
{
size_t len;
u_int32_t flags;
int isempty;
CHAR_T *p;
flags = set_txt_std(sp, vp, 0);
sp->showmode = SM_INSERT;
sp->lno = vp->m_start.lno;
if (db_eget(sp, sp->lno, &p, &len, &isempty)) {
if (!isempty)
return (1);
len = 0;
}
if (len == 0)
LF_SET(TXT_APPENDEOL);
return (v_txt(sp, vp, NULL, p, len,
0, OOBLNO, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags));
}
enum which { o_cmd, O_cmd };
static int io __P((SCR *, VICMD *, enum which));
/*
* v_iO -- [count]O
* Insert text above this line.
*
* PUBLIC: int v_iO __P((SCR *, VICMD *));
*/
int
v_iO(SCR *sp, VICMD *vp)
{
return (io(sp, vp, O_cmd));
}
/*
* v_io -- [count]o
* Insert text after this line.
*
* PUBLIC: int v_io __P((SCR *, VICMD *));
*/
int
v_io(SCR *sp, VICMD *vp)
{
return (io(sp, vp, o_cmd));
}
static int
io(SCR *sp, VICMD *vp, enum which cmd)
{
db_recno_t ai_line, lno;
size_t len;
u_int32_t flags;
CHAR_T *p;
flags = set_txt_std(sp, vp, TXT_ADDNEWLINE | TXT_APPENDEOL);
sp->showmode = SM_INSERT;
if (sp->lno == 1) {
if (db_last(sp, &lno))
return (1);
if (lno != 0)
goto insert;
p = NULL;
len = 0;
ai_line = OOBLNO;
} else {
static CHAR_T nul = 0;
insert: p = &nul;
sp->cno = 0;
LOG_CORRECT;
if (cmd == O_cmd) {
if (db_insert(sp, sp->lno, p, 0))
return (1);
if (db_get(sp, sp->lno, DBG_FATAL, &p, &len))
return (1);
ai_line = sp->lno + 1;
} else {
if (db_append(sp, 1, sp->lno, p, 0))
return (1);
if (db_get(sp, ++sp->lno, DBG_FATAL, &p, &len))
return (1);
ai_line = sp->lno - 1;
}
}
return (v_txt(sp, vp, NULL, p, len,
0, ai_line, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags));
}
/*
* v_change -- [buffer][count]c[count]motion
* [buffer][count]C
* [buffer][count]S
* Change command.
*
* PUBLIC: int v_change __P((SCR *, VICMD *));
*/
int
v_change(SCR *sp, VICMD *vp)
{
size_t blen, len;
u_int32_t flags;
int isempty, lmode, rval;
CHAR_T *bp;
CHAR_T *p;
/*
* 'c' can be combined with motion commands that set the resulting
* cursor position, i.e. "cG". Clear the VM_RCM flags and make the
* resulting cursor position stick, inserting text has its own rules
* for cursor positioning.
*/
F_CLR(vp, VM_RCM_MASK);
F_SET(vp, VM_RCM_SET);
/*
* Find out if the file is empty, it's easier to handle it as a
* special case.
*/
if (vp->m_start.lno == vp->m_stop.lno &&
db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
if (!isempty)
return (1);
return (v_ia(sp, vp));
}
flags = set_txt_std(sp, vp, 0);
sp->showmode = SM_CHANGE;
/*
* Move the cursor to the start of the change. Note, if autoindent
* is turned on, the cc command in line mode changes from the first
* *non-blank* character of the line, not the first character. And,
* to make it just a bit more exciting, the initial space is handled
* as auto-indent characters.
*/
lmode = F_ISSET(vp, VM_LMODE) ? CUT_LINEMODE : 0;
if (lmode) {
vp->m_start.cno = 0;
if (O_ISSET(sp, O_AUTOINDENT)) {
if (nonblank(sp, vp->m_start.lno, &vp->m_start.cno))
return (1);
LF_SET(TXT_AICHARS);
}
}
sp->lno = vp->m_start.lno;
sp->cno = vp->m_start.cno;
LOG_CORRECT;
/*
* If not in line mode and changing within a single line, copy the
* text and overwrite it.
*/
if (!lmode && vp->m_start.lno == vp->m_stop.lno) {
/*
* !!!
* Historic practice, c did not cut into the numeric buffers,
* only the unnamed one.
*/
if (cut(sp,
F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
&vp->m_start, &vp->m_stop, lmode))
return (1);
if (len == 0)
LF_SET(TXT_APPENDEOL);
LF_SET(TXT_EMARK | TXT_OVERWRITE);
return (v_txt(sp, vp, &vp->m_stop, p, len,
0, OOBLNO, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags));
}
/*
* It's trickier if in line mode or changing over multiple lines. If
* we're in line mode delete all of the lines and insert a replacement
* line which the user edits. If there was leading whitespace in the
* first line being changed, we copy it and use it as the replacement.
* If we're not in line mode, we delete the text and start inserting.
*
* !!!
* Copy the text. Historic practice, c did not cut into the numeric
* buffers, only the unnamed one.
*/
if (cut(sp,
F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
&vp->m_start, &vp->m_stop, lmode))
return (1);
/* If replacing entire lines and there's leading text. */
if (lmode && vp->m_start.cno) {
/*
* Get a copy of the first line changed, and copy out the
* leading text.
*/
if (db_get(sp, vp->m_start.lno, DBG_FATAL, &p, &len))
return (1);
GET_SPACE_RETW(sp, bp, blen, vp->m_start.cno);
MEMMOVEW(bp, p, vp->m_start.cno);
} else
bp = NULL;
/* Delete the text. */
if (del(sp, &vp->m_start, &vp->m_stop, lmode))
return (1);
/* If replacing entire lines, insert a replacement line. */
if (lmode) {
if (db_insert(sp, vp->m_start.lno, bp, vp->m_start.cno))
return (1);
sp->lno = vp->m_start.lno;
len = sp->cno = vp->m_start.cno;
}
/* Get the line we're editing. */
if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
if (!isempty)
return (1);
len = 0;
}
/* Check to see if we're appending to the line. */
if (vp->m_start.cno >= len)
LF_SET(TXT_APPENDEOL);
rval = v_txt(sp, vp, NULL, p, len,
0, OOBLNO, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags);
if (bp != NULL)
FREE_SPACEW(sp, bp, blen);
return (rval);
}
/*
* v_Replace -- [count]R
* Overwrite multiple characters.
*
* PUBLIC: int v_Replace __P((SCR *, VICMD *));
*/
int
v_Replace(SCR *sp, VICMD *vp)
{
size_t len;
u_int32_t flags;
int isempty;
CHAR_T *p;
flags = set_txt_std(sp, vp, 0);
sp->showmode = SM_REPLACE;
if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
if (!isempty)
return (1);
len = 0;
LF_SET(TXT_APPENDEOL);
} else {
if (len == 0)
LF_SET(TXT_APPENDEOL);
LF_SET(TXT_OVERWRITE | TXT_REPLACE);
}
vp->m_stop.lno = vp->m_start.lno;
vp->m_stop.cno = len ? len - 1 : 0;
return (v_txt(sp, vp, &vp->m_stop, p, len,
0, OOBLNO, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags));
}
/*
* v_subst -- [buffer][count]s
* Substitute characters.
*
* PUBLIC: int v_subst __P((SCR *, VICMD *));
*/
int
v_subst(SCR *sp, VICMD *vp)
{
size_t len;
u_int32_t flags;
int isempty;
CHAR_T *p;
flags = set_txt_std(sp, vp, 0);
sp->showmode = SM_CHANGE;
if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
if (!isempty)
return (1);
len = 0;
LF_SET(TXT_APPENDEOL);
} else {
if (len == 0)
LF_SET(TXT_APPENDEOL);
LF_SET(TXT_EMARK | TXT_OVERWRITE);
}
vp->m_stop.lno = vp->m_start.lno;
vp->m_stop.cno =
vp->m_start.cno + (F_ISSET(vp, VC_C1SET) ? vp->count - 1 : 0);
if (vp->m_stop.cno > len - 1)
vp->m_stop.cno = len - 1;
if (p != NULL && cut(sp,
F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
&vp->m_start, &vp->m_stop, 0))
return (1);
return (v_txt(sp, vp, &vp->m_stop, p, len, 0, OOBLNO, 1, flags));
}
/*
* set_txt_std --
* Initialize text processing flags.
*/
static u_int32_t
set_txt_std(SCR *sp, VICMD *vp, u_int32_t flags)
{
LF_SET(TXT_CNTRLT |
TXT_ESCAPE | TXT_MAPINPUT | TXT_RECORD | TXT_RESOLVE);
if (F_ISSET(vp, VC_ISDOT))
LF_SET(TXT_REPLAY);
if (O_ISSET(sp, O_ALTWERASE))
LF_SET(TXT_ALTWERASE);
if (O_ISSET(sp, O_AUTOINDENT))
LF_SET(TXT_AUTOINDENT);
if (O_ISSET(sp, O_BEAUTIFY))
LF_SET(TXT_BEAUTIFY);
if (O_ISSET(sp, O_SHOWMATCH))
LF_SET(TXT_SHOWMATCH);
if (F_ISSET(sp, SC_SCRIPT))
LF_SET(TXT_CR);
if (O_ISSET(sp, O_TTYWERASE))
LF_SET(TXT_TTYWERASE);
/*
* !!!
* Mapped keys were sometimes unaffected by the wrapmargin option
* in the historic 4BSD vi. Consider the following commands, where
* each is executed on an empty line, in an 80 column screen, with
* the wrapmargin value set to 60.
*
* aABC DEF <ESC>....
* :map K aABC DEF ^V<ESC><CR>KKKKK
* :map K 5aABC DEF ^V<ESC><CR>K
*
* The first and second commands are affected by wrapmargin. The
* third is not. (If the inserted text is itself longer than the
* wrapmargin value, i.e. if the "ABC DEF " string is replaced by
* something that's longer than 60 columns from the beginning of
* the line, the first two commands behave as before, but the third
* command gets fairly strange.) The problem is that people wrote
* macros that depended on the third command NOT being affected by
* wrapmargin, as in this gem which centers lines:
*
* map #c $mq81a ^V^[81^V^V|D`qld0:s/ / /g^V^M$p
*
* For compatibility reasons, we try and make it all work here. I
* offer no hope that this is right, but it's probably pretty close.
*
* XXX
* Once I work my courage up, this is all gonna go away. It's too
* evil to survive.
*/
if ((O_ISSET(sp, O_WRAPLEN) || O_ISSET(sp, O_WRAPMARGIN)) &&
(!MAPPED_KEYS_WAITING(sp) || !F_ISSET(vp, VC_C1SET)))
LF_SET(TXT_WRAPMARGIN);
return (flags);
}