NetBSD-5.0.2/dist/nvi/vi/v_txt.c
/* $NetBSD: v_txt.c,v 1.1.1.2.6.3 2009/01/20 03:05:01 snj Exp $ */
/*-
* Copyright (c) 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_txt.c,v 10.108 2003/07/18 21:27:42 skimo Exp (Berkeley) Date: 2003/07/18 21:27:42";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/stat.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 <unistd.h>
#include "../common/common.h"
#include "vi.h"
static int txt_abbrev __P((SCR *, TEXT *, CHAR_T *, int, int *, int *));
static void txt_ai_resolve __P((SCR *, TEXT *, int *));
static TEXT *txt_backup __P((SCR *, TEXTH *, TEXT *, u_int32_t *));
static int txt_dent __P((SCR *, TEXT *, int));
static int txt_emark __P((SCR *, TEXT *, size_t));
static void txt_err __P((SCR *, TEXTH *));
static int txt_fc __P((SCR *, TEXT *, int *));
static int txt_fc_col __P((SCR *, int, ARGS **));
static int txt_hex __P((SCR *, TEXT *));
static int txt_insch __P((SCR *, TEXT *, CHAR_T *, u_int));
static int txt_isrch __P((SCR *, VICMD *, TEXT *, u_int8_t *));
static int txt_map_end __P((SCR *));
static int txt_map_init __P((SCR *));
static int txt_margin __P((SCR *, TEXT *, TEXT *, int *, u_int32_t));
static void txt_nomorech __P((SCR *));
static void txt_Rresolve __P((SCR *, TEXTH *, TEXT *, const size_t));
static int txt_resolve __P((SCR *, TEXTH *, u_int32_t));
static int txt_showmatch __P((SCR *, TEXT *));
static void txt_unmap __P((SCR *, TEXT *, u_int32_t *));
/* Cursor character (space is hard to track on the screen). */
#if defined(DEBUG) && 0
#undef CH_CURSOR
#define CH_CURSOR '+'
#endif
/*
* v_tcmd --
* Fill a buffer from the terminal for vi.
*
* PUBLIC: int v_tcmd __P((SCR *, VICMD *, ARG_CHAR_T, u_int));
*/
int
v_tcmd(SCR *sp, VICMD *vp, ARG_CHAR_T prompt, u_int flags)
{
/* Normally, we end up where we started. */
vp->m_final.lno = sp->lno;
vp->m_final.cno = sp->cno;
/* Initialize the map. */
if (txt_map_init(sp))
return (1);
/* Move to the last line. */
sp->lno = TMAP[0].lno;
sp->cno = 0;
/* Don't update the modeline for now. */
F_SET(sp, SC_TINPUT_INFO);
/* Set the input flags. */
LF_SET(TXT_APPENDEOL |
TXT_CR | TXT_ESCAPE | TXT_INFOLINE | TXT_MAPINPUT);
if (O_ISSET(sp, O_ALTWERASE))
LF_SET(TXT_ALTWERASE);
if (O_ISSET(sp, O_TTYWERASE))
LF_SET(TXT_TTYWERASE);
/* Do the input thing. */
if (v_txt(sp, vp, NULL, NULL, 0, prompt, 0, 1, flags))
return (1);
/* Reenable the modeline updates. */
F_CLR(sp, SC_TINPUT_INFO);
/* Clean up the map. */
if (txt_map_end(sp))
return (1);
if (IS_ONELINE(sp))
F_SET(sp, SC_SCR_REDRAW); /* XXX */
/* Set the cursor to the resulting position. */
sp->lno = vp->m_final.lno;
sp->cno = vp->m_final.cno;
return (0);
}
/*
* txt_map_init
* Initialize the screen map for colon command-line input.
*/
static int
txt_map_init(SCR *sp)
{
SMAP *esmp;
VI_PRIVATE *vip;
vip = VIP(sp);
if (!IS_ONELINE(sp)) {
/*
* Fake like the user is doing input on the last line of the
* screen. This makes all of the scrolling work correctly,
* and allows us the use of the vi text editing routines, not
* to mention practically infinite length ex commands.
*
* Save the current location.
*/
vip->sv_tm_lno = TMAP->lno;
vip->sv_tm_soff = TMAP->soff;
vip->sv_tm_coff = TMAP->coff;
vip->sv_t_maxrows = sp->t_maxrows;
vip->sv_t_minrows = sp->t_minrows;
vip->sv_t_rows = sp->t_rows;
/*
* If it's a small screen, TMAP may be small for the screen.
* Fix it, filling in fake lines as we go.
*/
if (IS_SMALL(sp))
for (esmp =
HMAP + (sp->t_maxrows - 1); TMAP < esmp; ++TMAP) {
TMAP[1].lno = TMAP[0].lno + 1;
TMAP[1].coff = HMAP->coff;
TMAP[1].soff = 1;
}
/* Build the fake entry. */
TMAP[1].lno = TMAP[0].lno + 1;
TMAP[1].soff = 1;
TMAP[1].coff = 0;
SMAP_FLUSH(&TMAP[1]);
++TMAP;
/* Reset the screen information. */
sp->t_rows = sp->t_minrows = ++sp->t_maxrows;
}
return (0);
}
/*
* txt_map_end
* Reset the screen map for colon command-line input.
*/
static int
txt_map_end(SCR *sp)
{
VI_PRIVATE *vip;
size_t cnt;
vip = VIP(sp);
if (!IS_ONELINE(sp)) {
/* Restore the screen information. */
sp->t_rows = vip->sv_t_rows;
sp->t_minrows = vip->sv_t_minrows;
sp->t_maxrows = vip->sv_t_maxrows;
/*
* If it's a small screen, TMAP may be wrong. Clear any
* lines that might have been overwritten.
*/
if (IS_SMALL(sp)) {
for (cnt = sp->t_rows; cnt <= sp->t_maxrows; ++cnt) {
(void)sp->gp->scr_move(sp, cnt, 0);
(void)sp->gp->scr_clrtoeol(sp);
}
TMAP = HMAP + (sp->t_rows - 1);
} else
--TMAP;
/*
* The map may be wrong if the user entered more than one
* (logical) line. Fix it. If the user entered a whole
* screen, this will be slow, but we probably don't care.
*/
if (!O_ISSET(sp, O_LEFTRIGHT))
while (vip->sv_tm_lno != TMAP->lno ||
vip->sv_tm_soff != TMAP->soff)
if (vs_sm_1down(sp))
return (1);
}
/*
* Invalidate the cursor and the line size cache, the line never
* really existed. This fixes bugs where the user searches for
* the last line on the screen + 1 and the refresh routine thinks
* that's where we just were.
*/
VI_SCR_CFLUSH(vip);
F_SET(vip, VIP_CUR_INVALID);
return (0);
}
/*
* If doing input mapping on the colon command line, may need to unmap
* based on the command.
*/
#define UNMAP_TST \
FL_ISSET(ec_flags, EC_MAPINPUT) && LF_ISSET(TXT_INFOLINE)
/*
* Internally, we maintain tp->lno and tp->cno, externally, everyone uses
* sp->lno and sp->cno. Make them consistent as necessary.
*/
#define UPDATE_POSITION(sp, tp) { \
(sp)->lno = (tp)->lno; \
(sp)->cno = (tp)->cno; \
}
/*
* v_txt --
* Vi text input.
*
* PUBLIC: int v_txt __P((SCR *, VICMD *, MARK *,
* PUBLIC: const CHAR_T *, size_t, ARG_CHAR_T, db_recno_t, u_long, u_int32_t));
*/
int
v_txt(SCR *sp, VICMD *vp, MARK *tm, const CHAR_T *lp, size_t len, ARG_CHAR_T prompt, db_recno_t ai_line, u_long rcount, u_int32_t flags)
/* To MARK. */
/* Input line. */
/* Input line length. */
/* Prompt to display. */
/* Line number to use for autoindent count. */
/* Replay count. */
/* TXT_* flags. */
{
EVENT ev, *evp = NULL; /* Current event. */
EVENT fc; /* File name completion event. */
GS *gp;
TEXT *ntp, *tp; /* Input text structures. */
TEXT ait; /* Autoindent text structure. */
TEXT wmt; /* Wrapmargin text structure. */
TEXTH *tiqh;
VI_PRIVATE *vip;
abb_t abb; /* State of abbreviation checks. */
carat_t carat; /* State of the "[^0]^D" sequences. */
quote_t quote; /* State of quotation. */
size_t owrite, insert; /* Temporary copies of TEXT fields. */
size_t margin; /* Wrapmargin value. */
size_t rcol; /* 0-N: insert offset in the replay buffer. */
size_t tcol; /* Temporary column. */
u_int32_t ec_flags; /* Input mapping flags. */
#define IS_RESTART 0x01 /* Reset the incremental search. */
#define IS_RUNNING 0x02 /* Incremental search turned on. */
u_int8_t is_flags;
int abcnt, ab_turnoff; /* Abbreviation character count, switch. */
int filec_redraw; /* Redraw after the file completion routine. */
int hexcnt; /* Hex character count. */
int showmatch; /* Showmatch set on this character. */
int wm_set, wm_skip; /* Wrapmargin happened, blank skip flags. */
int max, tmp;
CHAR_T *p;
gp = sp->gp;
vip = VIP(sp);
memset(&wmt, 0, sizeof(wmt));
/*
* Set the input flag, so tabs get displayed correctly
* and everyone knows that the text buffer is in use.
*/
F_SET(sp, SC_TINPUT);
/*
* Get one TEXT structure with some initial buffer space, reusing
* the last one if it's big enough. (All TEXT bookkeeping fields
* default to 0 -- text_init() handles this.) If changing a line,
* copy it into the TEXT buffer.
*/
tiqh = &sp->tiq;
if (tiqh->cqh_first != (void *)tiqh) {
tp = tiqh->cqh_first;
if (tp->q.cqe_next != (void *)tiqh || tp->lb_len < len + 32) {
text_lfree(tiqh);
goto newtp;
}
tp->ai = tp->insert = tp->offset = tp->owrite = 0;
if (lp != NULL) {
tp->len = len;
BINC_RETW(sp, tp->lb, tp->lb_len, len);
MEMMOVEW(tp->lb, lp, len);
} else
tp->len = 0;
} else {
newtp: if ((tp = text_init(sp, lp, len, len + 32)) == NULL)
return (1);
CIRCLEQ_INSERT_HEAD(tiqh, tp, q);
}
/* Set default termination condition. */
tp->term = TERM_OK;
/* Set the starting line, column. */
tp->lno = sp->lno;
tp->cno = sp->cno;
/*
* Set the insert and overwrite counts. If overwriting characters,
* do insertion afterward. If not overwriting characters, assume
* doing insertion. If change is to a mark, emphasize it with an
* CH_ENDMARK character.
*/
if (len) {
if (LF_ISSET(TXT_OVERWRITE)) {
tp->owrite = (tm->cno - tp->cno) + 1;
tp->insert = (len - tm->cno) - 1;
} else
tp->insert = len - tp->cno;
if (LF_ISSET(TXT_EMARK) && txt_emark(sp, tp, tm->cno))
return (1);
}
/*
* Many of the special cases in text input are to handle autoindent
* support. Somebody decided that it would be a good idea if "^^D"
* and "0^D" deleted all of the autoindented characters. In an editor
* that takes single character input from the user, this beggars the
* imagination. Note also, "^^D" resets the next lines' autoindent,
* but "0^D" doesn't.
*
* We assume that autoindent only happens on empty lines, so insert
* and overwrite will be zero. If doing autoindent, figure out how
* much indentation we need and fill it in. Update input column and
* screen cursor as necessary.
*/
if (LF_ISSET(TXT_AUTOINDENT) && ai_line != OOBLNO) {
if (v_txt_auto(sp, ai_line, NULL, 0, tp))
return (1);
tp->cno = tp->ai;
} else {
/*
* The cc and S commands have a special feature -- leading
* <blank> characters are handled as autoindent characters.
* Beauty!
*/
if (LF_ISSET(TXT_AICHARS)) {
tp->offset = 0;
tp->ai = tp->cno;
} else
tp->offset = tp->cno;
}
/* If getting a command buffer from the user, there may be a prompt. */
if (LF_ISSET(TXT_PROMPT)) {
tp->lb[tp->cno++] = prompt;
++tp->len;
++tp->offset;
}
/*
* If appending after the end-of-line, add a space into the buffer
* and move the cursor right. This space is inserted, i.e. pushed
* along, and then deleted when the line is resolved. Assumes that
* the cursor is already positioned at the end of the line. This
* avoids the nastiness of having the cursor reside on a magical
* column, i.e. a column that doesn't really exist. The only down
* side is that we may wrap lines or scroll the screen before it's
* strictly necessary. Not a big deal.
*/
if (LF_ISSET(TXT_APPENDEOL)) {
tp->lb[tp->cno] = CH_CURSOR;
++tp->len;
++tp->insert;
(void)vs_change(sp, tp->lno, LINE_RESET);
}
/*
* Historic practice is that the wrapmargin value was a distance
* from the RIGHT-HAND margin, not the left. It's more useful to
* us as a distance from the left-hand margin, i.e. the same as
* the wraplen value. The wrapmargin option is historic practice.
* Nvi added the wraplen option so that it would be possible to
* edit files with consistent margins without knowing the number of
* columns in the window.
*
* XXX
* Setting margin causes a significant performance hit. Normally
* we don't update the screen if there are keys waiting, but we
* have to if margin is set, otherwise the screen routines don't
* know where the cursor is.
*
* !!!
* Abbreviated keys were affected by the wrapmargin option in the
* historic 4BSD vi. Mapped keys were usually, but sometimes not.
* See the comment in vi/v_text():set_txt_std for more information.
*
* !!!
* One more special case. If an inserted <blank> character causes
* wrapmargin to split the line, the next user entered character is
* discarded if it's a <space> character.
*/
wm_set = wm_skip = 0;
if (LF_ISSET(TXT_WRAPMARGIN))
if ((margin = O_VAL(sp, O_WRAPMARGIN)) != 0)
margin = sp->cols - margin;
else
margin = O_VAL(sp, O_WRAPLEN);
else
margin = 0;
/* Initialize abbreviation checks. */
abcnt = ab_turnoff = 0;
abb = F_ISSET(gp, G_ABBREV) &&
LF_ISSET(TXT_MAPINPUT) ? AB_INWORD : AB_NOTSET;
/*
* Set up the dot command. Dot commands are done by saving the actual
* characters and then reevaluating them so that things like wrapmargin
* can change between the insert and the replay.
*
* !!!
* Historically, vi did not remap or reabbreviate replayed input. (It
* did beep at you if you changed an abbreviation and then replayed the
* input. We're not that compatible.) We don't have to do anything to
* avoid remapping, as we're not getting characters from the terminal
* routines. Turn the abbreviation check off.
*
* XXX
* It would be nice if we could swallow backspaces and such, but it's
* not all that easy to do. What we can do is turn off the common
* error messages during the replay. Otherwise, when the user enters
* an illegal command, e.g., "Ia<erase><erase><erase><erase>b<escape>",
* and then does a '.', they get a list of error messages after command
* completion.
*/
rcol = 0;
if (LF_ISSET(TXT_REPLAY)) {
abb = AB_NOTSET;
LF_CLR(TXT_RECORD);
}
/* Other text input mode setup. */
quote = Q_NOTSET;
carat = C_NOTSET;
FL_INIT(is_flags,
LF_ISSET(TXT_SEARCHINCR) ? IS_RESTART | IS_RUNNING : 0);
filec_redraw = hexcnt = showmatch = 0;
/* Initialize input flags. */
ec_flags = LF_ISSET(TXT_MAPINPUT) ? EC_MAPINPUT : 0;
/* Refresh the screen. */
UPDATE_POSITION(sp, tp);
if (vs_refresh(sp, 1))
return (1);
/* If it's dot, just do it now. */
if (F_ISSET(vp, VC_ISDOT))
goto replay;
/* Get an event. */
evp = &ev;
next: if (v_event_get(sp, evp, 0, ec_flags))
return (1);
/*
* If file completion overwrote part of the screen and nothing else has
* been displayed, clean up. We don't do this as part of the normal
* message resolution because we know the user is on the colon command
* line and there's no reason to enter explicit characters to continue.
*/
if (filec_redraw && !F_ISSET(sp, SC_SCR_EXWROTE)) {
filec_redraw = 0;
fc.e_event = E_REPAINT;
fc.e_flno = vip->totalcount >=
sp->rows ? 1 : sp->rows - vip->totalcount;
fc.e_tlno = sp->rows;
vip->linecount = vip->lcontinue = vip->totalcount = 0;
(void)v_erepaint(sp, &fc);
(void)vs_refresh(sp, 1);
}
/* Deal with all non-character events. */
switch (evp->e_event) {
case E_CHARACTER:
break;
case E_ERR:
case E_EOF:
F_SET(sp, SC_EXIT_FORCE);
return (1);
case E_INTERRUPT:
/*
* !!!
* Historically, <interrupt> exited the user from text input
* mode or cancelled a colon command, and returned to command
* mode. It also beeped the terminal, but that seems a bit
* excessive.
*/
goto k_escape;
case E_REPAINT:
if (v_erepaint(sp, &ev))
return (1);
goto next;
case E_WRESIZE:
/* <resize> interrupts the input mode. */
v_emsg(sp, NULL, VIM_WRESIZE);
goto k_escape;
default:
v_event_err(sp, evp);
goto k_escape;
}
/*
* !!!
* If the first character of the input is a nul, replay the previous
* input. (Historically, it's okay to replay non-existent input.)
* This was not documented as far as I know, and is a great test of vi
* clones.
*/
if (rcol == 0 && !LF_ISSET(TXT_REPLAY) && evp->e_c == '\0') {
if (vip->rep == NULL)
goto done;
abb = AB_NOTSET;
LF_CLR(TXT_RECORD);
LF_SET(TXT_REPLAY);
goto replay;
}
/*
* File name completion and colon command-line editing. We don't
* have enough meta characters, so we expect people to overload
* them. If the two characters are the same, then we do file name
* completion if the cursor is past the first column, and do colon
* command-line editing if it's not.
*/
if (quote == Q_NOTSET) {
int L__cedit, L__filec;
L__cedit = L__filec = 0;
if (LF_ISSET(TXT_CEDIT) && O_STR(sp, O_CEDIT) != NULL &&
O_STR(sp, O_CEDIT)[0] == evp->e_c)
L__cedit = 1;
if (LF_ISSET(TXT_FILEC) && O_STR(sp, O_FILEC) != NULL &&
O_STR(sp, O_FILEC)[0] == evp->e_c)
L__filec = 1;
if (L__cedit == 1 && (L__filec == 0 || tp->cno == tp->offset)) {
tp->term = TERM_CEDIT;
goto k_escape;
}
if (L__filec == 1) {
if (txt_fc(sp, tp, &filec_redraw))
goto err;
goto resolve;
}
}
/* Abbreviation overflow check. See comment in txt_abbrev(). */
#define MAX_ABBREVIATION_EXPANSION 256
if (FL_ISSET(evp->e_flags, CH_ABBREVIATED)) {
if (++abcnt > MAX_ABBREVIATION_EXPANSION) {
if (v_event_flush(sp, CH_ABBREVIATED))
msgq(sp, M_ERR,
"191|Abbreviation exceeded expansion limit: characters discarded");
abcnt = 0;
if (LF_ISSET(TXT_REPLAY))
goto done;
goto resolve;
}
} else
abcnt = 0;
/* Check to see if the character fits into the replay buffers. */
if (LF_ISSET(TXT_RECORD)) {
BINC_GOTO(sp, EVENT, vip->rep,
vip->rep_len, (rcol + 1) * sizeof(EVENT));
vip->rep[rcol++] = *evp;
}
replay: if (LF_ISSET(TXT_REPLAY)) {
if (rcol == vip->rep_cnt)
goto k_escape;
evp = vip->rep + rcol++;
}
/* Wrapmargin check for leading space. */
if (wm_skip) {
wm_skip = 0;
if (evp->e_c == ' ')
goto resolve;
}
/* If quoted by someone else, simply insert the character. */
if (FL_ISSET(evp->e_flags, CH_QUOTED))
goto insq_ch;
/*
* !!!
* If this character was quoted by a K_VLNEXT or a backslash, replace
* the placeholder (a carat or a backslash) with the new character.
* If it was quoted by a K_VLNEXT, we've already adjusted the cursor
* because it has to appear on top of the placeholder character. If
* it was quoted by a backslash, adjust the cursor now, the cursor
* doesn't appear on top of it. Historic practice in both cases.
*
* Skip tests for abbreviations; ":ab xa XA" followed by "ixa^V<space>"
* doesn't perform an abbreviation. Special case, ^V^J (not ^V^M) is
* the same as ^J, historically.
*/
if (quote == Q_BTHIS || quote == Q_VTHIS) {
FL_CLR(ec_flags, EC_QUOTED);
if (LF_ISSET(TXT_MAPINPUT))
FL_SET(ec_flags, EC_MAPINPUT);
if (quote == Q_BTHIS &&
(evp->e_value == K_VERASE || evp->e_value == K_VKILL)) {
quote = Q_NOTSET;
--tp->cno;
++tp->owrite;
goto insl_ch;
}
if (quote == Q_VTHIS && evp->e_value != K_NL) {
quote = Q_NOTSET;
goto insl_ch;
}
quote = Q_NOTSET;
}
/*
* !!!
* Translate "<CH_HEX>[isxdigit()]*" to a character with a hex value:
* this test delimits the value by any non-hex character. Offset by
* one, we use 0 to mean that we've found <CH_HEX>.
*/
if (hexcnt > 1 && !isxdigit(evp->e_c)) {
hexcnt = 0;
if (txt_hex(sp, tp))
goto err;
}
switch (evp->e_value) {
case K_CR: /* Carriage return. */
case K_NL: /* New line. */
/* Return in script windows and the command line. */
k_cr: if (LF_ISSET(TXT_CR)) {
static CHAR_T cr[] = { '\r', 0 };
/*
* If this was a map, we may have not displayed
* the line. Display it, just in case.
*
* If a script window and not the colon line,
* push a <cr> so it gets executed.
*/
if (LF_ISSET(TXT_INFOLINE)) {
if (vs_change(sp, tp->lno, LINE_RESET))
goto err;
} else if (F_ISSET(sp, SC_SCRIPT))
(void)v_event_push(sp, NULL, cr, 1, CH_NOMAP);
/* Set term condition: if empty. */
if (tp->cno <= tp->offset)
tp->term = TERM_CR;
/*
* Set term condition: if searching incrementally and
* the user entered a pattern, return a completed
* search, regardless if the entire pattern was found.
*/
if (FL_ISSET(is_flags, IS_RUNNING) &&
tp->cno >= tp->offset + 1)
tp->term = TERM_SEARCH;
goto k_escape;
}
#define LINE_RESOLVE { \
/* \
* Handle abbreviations. If there was one, discard the \
* replay characters. \
*/ \
if (abb == AB_INWORD && \
!LF_ISSET(TXT_REPLAY) && F_ISSET(gp, G_ABBREV)) { \
if (txt_abbrev(sp, tp, &evp->e_c, \
LF_ISSET(TXT_INFOLINE), &tmp, \
&ab_turnoff)) \
goto err; \
if (tmp) { \
if (LF_ISSET(TXT_RECORD)) \
rcol -= tmp + 1; \
goto resolve; \
} \
} \
if (abb != AB_NOTSET) \
abb = AB_NOTWORD; \
if (UNMAP_TST) \
txt_unmap(sp, tp, &ec_flags); \
/* \
* Delete any appended cursor. It's possible to get in \
* situations where TXT_APPENDEOL is set but tp->insert \
* is 0 when using the R command and all the characters \
* are tp->owrite characters. \
*/ \
if (LF_ISSET(TXT_APPENDEOL) && tp->insert > 0) { \
--tp->len; \
--tp->insert; \
} \
}
LINE_RESOLVE;
/*
* Save the current line information for restoration in
* txt_backup(), and set the line final length.
*/
tp->sv_len = tp->len;
tp->sv_cno = tp->cno;
tp->len = tp->cno;
/* Update the old line. */
if (vs_change(sp, tp->lno, LINE_RESET))
goto err;
/*
* Historic practice, when the autoindent edit option was set,
* was to delete <blank> characters following the inserted
* newline. This affected the 'R', 'c', and 's' commands; 'c'
* and 's' retained the insert characters only, 'R' moved the
* overwrite and insert characters into the next TEXT structure.
* We keep track of the number of characters erased for the 'R'
* command so that the final resolution of the line is correct.
*/
tp->R_erase = 0;
owrite = tp->owrite;
insert = tp->insert;
if (LF_ISSET(TXT_REPLACE) && owrite != 0) {
for (p = tp->lb + tp->cno; owrite > 0 && isblank(*p);
++p, --owrite, ++tp->R_erase);
if (owrite == 0)
for (; insert > 0 && isblank(*p);
++p, ++tp->R_erase, --insert);
} else {
p = tp->lb + tp->cno + owrite;
if (O_ISSET(sp, O_AUTOINDENT))
for (; insert > 0 &&
isblank(*p); ++p, --insert);
owrite = 0;
}
/*
* !!!
* Create a new line and insert the new TEXT into the queue.
* DON'T insert until the old line has been updated, or the
* inserted line count in line.c:db_get() will be wrong.
*/
if ((ntp = text_init(sp, p,
insert + owrite, insert + owrite + 32)) == NULL)
goto err;
CIRCLEQ_INSERT_TAIL(&sp->tiq, ntp, q);
/* Set up bookkeeping for the new line. */
ntp->insert = insert;
ntp->owrite = owrite;
ntp->lno = tp->lno + 1;
/*
* Reset the autoindent line value. 0^D keeps the autoindent
* line from changing, ^D changes the level, even if there were
* no characters in the old line. Note, if using the current
* tp structure, use the cursor as the length, the autoindent
* characters may have been erased.
*/
if (LF_ISSET(TXT_AUTOINDENT)) {
if (carat == C_NOCHANGE) {
if (v_txt_auto(sp, OOBLNO, &ait, ait.ai, ntp))
goto err;
FREE_SPACEW(sp, ait.lb, ait.lb_len);
} else
if (v_txt_auto(sp, OOBLNO, tp, tp->cno, ntp))
goto err;
carat = C_NOTSET;
}
/* Reset the cursor. */
ntp->cno = ntp->ai;
/*
* If we're here because wrapmargin was set and we've broken a
* line, there may be additional information (i.e. the start of
* a line) in the wmt structure.
*/
if (wm_set) {
if (wmt.offset != 0 ||
wmt.owrite != 0 || wmt.insert != 0) {
#define WMTSPACE wmt.offset + wmt.owrite + wmt.insert
BINC_GOTOW(sp, ntp->lb,
ntp->lb_len, ntp->len + WMTSPACE + 32);
MEMMOVEW(ntp->lb + ntp->cno, wmt.lb, WMTSPACE);
ntp->len += WMTSPACE;
ntp->cno += wmt.offset;
ntp->owrite = wmt.owrite;
ntp->insert = wmt.insert;
}
wm_set = 0;
}
/* New lines are TXT_APPENDEOL. */
if (ntp->owrite == 0 && ntp->insert == 0) {
BINC_GOTOW(sp, ntp->lb, ntp->lb_len, ntp->len + 1);
LF_SET(TXT_APPENDEOL);
ntp->lb[ntp->cno] = CH_CURSOR;
++ntp->insert;
++ntp->len;
}
/* Swap old and new TEXT's, and update the new line. */
tp = ntp;
if (vs_change(sp, tp->lno, LINE_INSERT))
goto err;
goto resolve;
case K_ESCAPE: /* Escape. */
if (!LF_ISSET(TXT_ESCAPE))
goto ins_ch;
/* If we have a count, start replaying the input. */
if (rcount > 1) {
--rcount;
vip->rep_cnt = rcol;
rcol = 0;
abb = AB_NOTSET;
LF_CLR(TXT_RECORD);
LF_SET(TXT_REPLAY);
/*
* Some commands (e.g. 'o') need a <newline> for each
* repetition.
*/
if (LF_ISSET(TXT_ADDNEWLINE))
goto k_cr;
/*
* The R command turns into the 'a' command after the
* first repetition.
*/
if (LF_ISSET(TXT_REPLACE)) {
tp->insert = tp->owrite;
tp->owrite = 0;
LF_CLR(TXT_REPLACE);
}
goto replay;
}
/* Set term condition: if empty. */
if (tp->cno <= tp->offset)
tp->term = TERM_ESC;
/*
* Set term condition: if searching incrementally and the user
* entered a pattern, return a completed search, regardless if
* the entire pattern was found.
*/
if (FL_ISSET(is_flags, IS_RUNNING) && tp->cno >= tp->offset + 1)
tp->term = TERM_SEARCH;
k_escape: LINE_RESOLVE;
/*
* Clean up for the 'R' command, restoring overwrite
* characters, and making them into insert characters.
*/
if (LF_ISSET(TXT_REPLACE))
txt_Rresolve(sp, &sp->tiq, tp, len);
/*
* If there are any overwrite characters, copy down
* any insert characters, and decrement the length.
*/
if (tp->owrite) {
if (tp->insert)
MEMMOVEW(tp->lb + tp->cno,
tp->lb + tp->cno + tp->owrite, tp->insert);
tp->len -= tp->owrite;
}
/*
* Optionally resolve the lines into the file. If not
* resolving the lines into the file, end the line with
* a nul. If the line is empty, then set the length to
* 0, the termination condition has already been set.
*
* XXX
* This is wrong, should pass back a length.
*/
if (LF_ISSET(TXT_RESOLVE)) {
if (txt_resolve(sp, &sp->tiq, flags))
goto err;
} else {
BINC_GOTOW(sp, tp->lb, tp->lb_len, tp->len + 1);
tp->lb[tp->len] = '\0';
}
/*
* Set the return cursor position to rest on the last
* inserted character.
*/
if (tp->cno != 0)
--tp->cno;
/* Update the last line. */
if (vs_change(sp, tp->lno, LINE_RESET))
return (1);
goto done;
case K_CARAT: /* Delete autoindent chars. */
if (tp->cno <= tp->ai && LF_ISSET(TXT_AUTOINDENT))
carat = C_CARATSET;
goto ins_ch;
case K_ZERO: /* Delete autoindent chars. */
if (tp->cno <= tp->ai && LF_ISSET(TXT_AUTOINDENT))
carat = C_ZEROSET;
goto ins_ch;
case K_CNTRLD: /* Delete autoindent char. */
/*
* If in the first column or no characters to erase, ignore
* the ^D (this matches historic practice). If not doing
* autoindent or already inserted non-ai characters, it's a
* literal. The latter test is done in the switch, as the
* CARAT forms are N + 1, not N.
*/
if (!LF_ISSET(TXT_AUTOINDENT))
goto ins_ch;
if (tp->cno == 0)
goto resolve;
switch (carat) {
case C_CARATSET: /* ^^D */
if (tp->ai == 0 || tp->cno != tp->ai + tp->offset + 1)
goto ins_ch;
/* Save the ai string for later. */
ait.lb = NULL;
ait.lb_len = 0;
BINC_GOTOW(sp, ait.lb, ait.lb_len, tp->ai);
MEMMOVEW(ait.lb, tp->lb, tp->ai);
ait.ai = ait.len = tp->ai;
carat = C_NOCHANGE;
goto leftmargin;
case C_ZEROSET: /* 0^D */
if (tp->ai == 0 || tp->cno != tp->ai + tp->offset + 1)
goto ins_ch;
carat = C_NOTSET;
leftmargin: tp->lb[tp->cno - 1] = ' ';
tp->owrite += tp->cno - tp->offset;
tp->cno = tp->offset;
break;
case C_NOCHANGE: /* ^D after reset with ^^D */
/* FALLTHROUGH */
case C_NOTSET: /* ^D */
if (tp->ai == 0 || tp->cno != tp->ai + tp->offset)
goto ins_ch;
(void)txt_dent(sp, tp, 0);
break;
default:
abort();
}
break;
case K_VERASE: /* Erase the last character. */
/* If can erase over the prompt, return. */
if (tp->cno <= tp->offset && LF_ISSET(TXT_BS)) {
tp->term = TERM_BS;
goto done;
}
/*
* If at the beginning of the line, try and drop back to a
* previously inserted line.
*/
if (tp->cno == 0) {
if ((ntp =
txt_backup(sp, &sp->tiq, tp, &flags)) == NULL)
goto err;
tp = ntp;
break;
}
/* If nothing to erase, bell the user. */
if (tp->cno <= tp->offset) {
if (!LF_ISSET(TXT_REPLAY))
txt_nomorech(sp);
break;
}
/* Drop back one character. */
--tp->cno;
/*
* Historically, vi didn't replace the erased characters with
* <blank>s, presumably because it's easier to fix a minor
* typing mistake and continue on if the previous letters are
* already there. This is a problem for incremental searching,
* because the user can no longer tell where they are in the
* colon command line because the cursor is at the last search
* point in the screen. So, if incrementally searching, erase
* the erased characters from the screen.
*/
if (FL_ISSET(is_flags, IS_RUNNING))
tp->lb[tp->cno] = ' ';
/*
* Increment overwrite, decrement ai if deleted.
*
* !!!
* Historic vi did not permit users to use erase characters
* to delete autoindent characters. We do. Eat hot death,
* POSIX.
*/
++tp->owrite;
if (tp->cno < tp->ai)
--tp->ai;
/* Reset if we deleted an incremental search character. */
if (FL_ISSET(is_flags, IS_RUNNING))
FL_SET(is_flags, IS_RESTART);
break;
case K_VWERASE: /* Skip back one word. */
/*
* If at the beginning of the line, try and drop back to a
* previously inserted line.
*/
if (tp->cno == 0) {
if ((ntp =
txt_backup(sp, &sp->tiq, tp, &flags)) == NULL)
goto err;
tp = ntp;
}
/*
* If at offset, nothing to erase so bell the user.
*/
if (tp->cno <= tp->offset) {
if (!LF_ISSET(TXT_REPLAY))
txt_nomorech(sp);
break;
}
/*
* The first werase goes back to any autoindent column and the
* second werase goes back to the offset.
*
* !!!
* Historic vi did not permit users to use erase characters to
* delete autoindent characters.
*/
if (tp->ai && tp->cno > tp->ai)
max = tp->ai;
else {
tp->ai = 0;
max = tp->offset;
}
/* Skip over trailing space characters. */
while (tp->cno > max && isblank(tp->lb[tp->cno - 1])) {
--tp->cno;
++tp->owrite;
}
if (tp->cno == max)
break;
/*
* There are three types of word erase found on UNIX systems.
* They can be identified by how the string /a/b/c is treated
* -- as 1, 3, or 6 words. Historic vi had two classes of
* characters, and strings were delimited by them and
* <blank>'s, so, 6 words. The historic tty interface used
* <blank>'s to delimit strings, so, 1 word. The algorithm
* offered in the 4.4BSD tty interface (as stty altwerase)
* treats it as 3 words -- there are two classes of
* characters, and strings are delimited by them and
* <blank>'s. The difference is that the type of the first
* erased character erased is ignored, which is exactly right
* when erasing pathname components. The edit options
* TXT_ALTWERASE and TXT_TTYWERASE specify the 4.4BSD tty
* interface and the historic tty driver behavior,
* respectively, and the default is the same as the historic
* vi behavior.
*
* Overwrite erased characters if doing incremental search;
* see comment above.
*/
if (LF_ISSET(TXT_TTYWERASE))
while (tp->cno > max) {
--tp->cno;
++tp->owrite;
if (FL_ISSET(is_flags, IS_RUNNING))
tp->lb[tp->cno] = ' ';
if (isblank(tp->lb[tp->cno - 1]))
break;
}
else {
if (LF_ISSET(TXT_ALTWERASE)) {
--tp->cno;
++tp->owrite;
if (FL_ISSET(is_flags, IS_RUNNING))
tp->lb[tp->cno] = ' ';
if (isblank(tp->lb[tp->cno - 1]))
break;
}
if (tp->cno > max)
tmp = inword(tp->lb[tp->cno - 1]);
while (tp->cno > max) {
--tp->cno;
++tp->owrite;
if (FL_ISSET(is_flags, IS_RUNNING))
tp->lb[tp->cno] = ' ';
if (tmp != inword(tp->lb[tp->cno - 1])
|| isblank(tp->lb[tp->cno - 1]))
break;
}
}
/* Reset if we deleted an incremental search character. */
if (FL_ISSET(is_flags, IS_RUNNING))
FL_SET(is_flags, IS_RESTART);
break;
case K_VKILL: /* Restart this line. */
/*
* !!!
* If at the beginning of the line, try and drop back to a
* previously inserted line. Historic vi did not permit
* users to go back to previous lines.
*/
if (tp->cno == 0) {
if ((ntp =
txt_backup(sp, &sp->tiq, tp, &flags)) == NULL)
goto err;
tp = ntp;
}
/* If at offset, nothing to erase so bell the user. */
if (tp->cno <= tp->offset) {
if (!LF_ISSET(TXT_REPLAY))
txt_nomorech(sp);
break;
}
/*
* First kill goes back to any autoindent and second kill goes
* back to the offset.
*
* !!!
* Historic vi did not permit users to use erase characters to
* delete autoindent characters.
*/
if (tp->ai && tp->cno > tp->ai)
max = tp->ai;
else {
tp->ai = 0;
max = tp->offset;
}
tp->owrite += tp->cno - max;
/*
* Overwrite erased characters if doing incremental search;
* see comment above.
*/
if (FL_ISSET(is_flags, IS_RUNNING))
do {
tp->lb[--tp->cno] = ' ';
} while (tp->cno > max);
else
tp->cno = max;
/* Reset if we deleted an incremental search character. */
if (FL_ISSET(is_flags, IS_RUNNING))
FL_SET(is_flags, IS_RESTART);
break;
case K_CNTRLT: /* Add autoindent characters. */
if (!LF_ISSET(TXT_CNTRLT))
goto ins_ch;
if (txt_dent(sp, tp, 1))
goto err;
goto ebuf_chk;
case K_RIGHTBRACE:
case K_RIGHTPAREN:
if (LF_ISSET(TXT_SHOWMATCH))
showmatch = 1;
goto ins_ch;
case K_BACKSLASH: /* Quote next erase/kill. */
/*
* !!!
* Historic vi tried to make abbreviations after a backslash
* escape work. If you did ":ab x y", and inserted "x\^H",
* (assuming the erase character was ^H) you got "x^H", and
* no abbreviation was done. If you inserted "x\z", however,
* it tried to back up and do the abbreviation, i.e. replace
* 'x' with 'y'. The problem was it got it wrong, and you
* ended up with "zy\".
*
* This is really hard to do (you have to remember the
* word/non-word state, for example), and doesn't make any
* sense to me. Both backslash and the characters it
* (usually) escapes will individually trigger the
* abbreviation, so I don't see why the combination of them
* wouldn't. I don't expect to get caught on this one,
* particularly since it never worked right, but I've been
* wrong before.
*
* Do the tests for abbreviations, so ":ab xa XA",
* "ixa\<K_VERASE>" performs the abbreviation.
*/
quote = Q_BNEXT;
goto insq_ch;
case K_VLNEXT: /* Quote next character. */
evp->e_c = '^';
quote = Q_VNEXT;
/*
* Turn on the quote flag so that the underlying routines
* quote the next character where it's possible. Turn off
* the input mapbiting flag so that we don't remap the next
* character.
*/
FL_SET(ec_flags, EC_QUOTED);
FL_CLR(ec_flags, EC_MAPINPUT);
/*
* !!!
* Skip the tests for abbreviations, so ":ab xa XA",
* "ixa^V<space>" doesn't perform the abbreviation.
*/
goto insl_ch;
case K_HEXCHAR:
hexcnt = 1;
goto insq_ch;
default: /* Insert the character. */
ins_ch: /*
* Historically, vi eliminated nul's out of hand. If the
* beautify option was set, it also deleted any unknown
* ASCII value less than space (040) and the del character
* (0177), except for tabs. Unknown is a key word here.
* Most vi documentation claims that it deleted everything
* but <tab>, <nl> and <ff>, as that's what the original
* 4BSD documentation said. This is obviously wrong,
* however, as <esc> would be included in that list. What
* we do is eliminate any unquoted, iscntrl() character that
* wasn't a replay and wasn't handled specially, except
* <tab> or <ff>.
*/
if (LF_ISSET(TXT_BEAUTIFY) && ISCNTRL(evp->e_c) &&
evp->e_value != K_FORMFEED && evp->e_value != K_TAB) {
msgq(sp, M_BERR,
"192|Illegal character; quote to enter");
if (LF_ISSET(TXT_REPLAY))
goto done;
break;
}
insq_ch: /*
* If entering a non-word character after a word, check for
* abbreviations. If there was one, discard replay characters.
* If entering a blank character, check for unmap commands,
* as well.
*/
if (!inword(evp->e_c)) {
if (abb == AB_INWORD &&
!LF_ISSET(TXT_REPLAY) && F_ISSET(gp, G_ABBREV)) {
if (txt_abbrev(sp, tp, &evp->e_c,
LF_ISSET(TXT_INFOLINE), &tmp, &ab_turnoff))
goto err;
if (tmp) {
if (LF_ISSET(TXT_RECORD))
rcol -= tmp + 1;
goto resolve;
}
}
if (isblank(evp->e_c) && UNMAP_TST)
txt_unmap(sp, tp, &ec_flags);
}
if (abb != AB_NOTSET)
abb = inword(evp->e_c) ? AB_INWORD : AB_NOTWORD;
insl_ch: if (txt_insch(sp, tp, &evp->e_c, flags))
goto err;
/*
* If we're using K_VLNEXT to quote the next character, then
* we want the cursor to position itself on the ^ placeholder
* we're displaying, to match historic practice.
*/
if (quote == Q_VNEXT) {
--tp->cno;
++tp->owrite;
}
/*
* !!!
* Translate "<CH_HEX>[isxdigit()]*" to a character with
* a hex value: this test delimits the value by the max
* number of hex bytes. Offset by one, we use 0 to mean
* that we've found <CH_HEX>.
*/
if (hexcnt != 0 && hexcnt++ == sizeof(CHAR_T) * 2 + 1) {
hexcnt = 0;
if (txt_hex(sp, tp))
goto err;
}
/*
* Check to see if we've crossed the margin.
*
* !!!
* In the historic vi, the wrapmargin value was figured out
* using the display widths of the characters, i.e. <tab>
* characters were counted as two characters if the list edit
* option is set, but as the tabstop edit option number of
* characters otherwise. That's what the vs_column() function
* gives us, so we use it.
*/
if (margin != 0) {
if (vs_column(sp, &tcol))
goto err;
if (tcol >= margin) {
if (txt_margin(sp, tp, &wmt, &tmp, flags))
goto err;
if (tmp) {
if (isblank(evp->e_c))
wm_skip = 1;
wm_set = 1;
goto k_cr;
}
}
}
/*
* If we've reached the end of the buffer, then we need to
* switch into insert mode. This happens when there's a
* change to a mark and the user puts in more characters than
* the length of the motion.
*/
ebuf_chk: if (tp->cno >= tp->len) {
BINC_GOTOW(sp, tp->lb, tp->lb_len, tp->len + 1);
LF_SET(TXT_APPENDEOL);
tp->lb[tp->cno] = CH_CURSOR;
++tp->insert;
++tp->len;
}
/* Step the quote state forward. */
if (quote != Q_NOTSET) {
if (quote == Q_BNEXT)
quote = Q_BTHIS;
if (quote == Q_VNEXT)
quote = Q_VTHIS;
}
break;
}
#ifdef DEBUG
if (tp->cno + tp->insert + tp->owrite != tp->len) {
msgq(sp, M_ERR,
"len %u != cno: %u ai: %u insert %u overwrite %u",
tp->len, tp->cno, tp->ai, tp->insert, tp->owrite);
if (LF_ISSET(TXT_REPLAY))
goto done;
tp->len = tp->cno + tp->insert + tp->owrite;
}
#endif
resolve:/*
* 1: If we don't need to know where the cursor really is and we're
* replaying text, keep going.
*/
if (margin == 0 && LF_ISSET(TXT_REPLAY))
goto replay;
/*
* 2: Reset the line. Don't bother unless we're about to wait on
* a character or we need to know where the cursor really is.
* We have to do this before showing matching characters so the
* user can see what they're matching.
*/
if ((margin != 0 || !KEYS_WAITING(sp)) &&
vs_change(sp, tp->lno, LINE_RESET))
return (1);
/*
* 3: If there aren't keys waiting, display the matching character.
* We have to do this before resolving any messages, otherwise
* the error message from a missing match won't appear correctly.
*/
if (showmatch) {
if (!KEYS_WAITING(sp) && txt_showmatch(sp, tp))
return (1);
showmatch = 0;
}
/*
* 4: If there have been messages and we're not editing on the colon
* command line or doing file name completion, resolve them.
*/
if ((vip->totalcount != 0 || F_ISSET(gp, G_BELLSCHED)) &&
!F_ISSET(sp, SC_TINPUT_INFO) && !filec_redraw &&
vs_resolve(sp, NULL, 0))
return (1);
/*
* 5: Refresh the screen if we're about to wait on a character or we
* need to know where the cursor really is.
*/
if (margin != 0 || !KEYS_WAITING(sp)) {
UPDATE_POSITION(sp, tp);
if (vs_refresh(sp, margin != 0))
return (1);
}
/* 6: Proceed with the incremental search. */
if (FL_ISSET(is_flags, IS_RUNNING) && txt_isrch(sp, vp, tp, &is_flags))
return (1);
/* 7: Next character... */
if (LF_ISSET(TXT_REPLAY))
goto replay;
goto next;
done: /* Leave input mode. */
F_CLR(sp, SC_TINPUT);
/* If recording for playback, save it. */
if (LF_ISSET(TXT_RECORD))
vip->rep_cnt = rcol;
/*
* If not working on the colon command line, set the final cursor
* position.
*/
if (!F_ISSET(sp, SC_TINPUT_INFO)) {
vp->m_final.lno = tp->lno;
vp->m_final.cno = tp->cno;
}
return (0);
err:
alloc_err:
F_CLR(sp, SC_TINPUT);
txt_err(sp, &sp->tiq);
return (1);
}
/*
* txt_abbrev --
* Handle abbreviations.
*/
static int
txt_abbrev(SCR *sp, TEXT *tp, CHAR_T *pushcp, int isinfoline, int *didsubp, int *turnoffp)
{
VI_PRIVATE *vip;
CHAR_T ch, *p;
SEQ *qp;
size_t len, off;
/* Check to make sure we're not at the start of an append. */
*didsubp = 0;
if (tp->cno == tp->offset)
return (0);
vip = VIP(sp);
/*
* Find the start of the "word".
*
* !!!
* We match historic practice, which, as far as I can tell, had an
* off-by-one error. The way this worked was that when the inserted
* text switched from a "word" character to a non-word character,
* vi would check for possible abbreviations. It would then take the
* type (i.e. word/non-word) of the character entered TWO characters
* ago, and move backward in the text until reaching a character that
* was not that type, or the beginning of the insert, the line, or
* the file. For example, in the string "abc<space>", when the <space>
* character triggered the abbreviation check, the type of the 'b'
* character was used for moving through the string. Maybe there's a
* reason for not using the first (i.e. 'c') character, but I can't
* think of one.
*
* Terminate at the beginning of the insert or the character after the
* offset character -- both can be tested for using tp->offset.
*/
off = tp->cno - 1; /* Previous character. */
p = tp->lb + off;
len = 1; /* One character test. */
if (off == tp->offset || isblank(p[-1]))
goto search;
if (inword(p[-1])) /* Move backward to change. */
for (;;) {
--off; --p; ++len;
if (off == tp->offset || !inword(p[-1]))
break;
}
else
for (;;) {
--off; --p; ++len;
if (off == tp->offset ||
inword(p[-1]) || isblank(p[-1]))
break;
}
/*
* !!!
* Historic vi exploded abbreviations on the command line. This has
* obvious problems in that unabbreviating the string can be extremely
* tricky, particularly if the string has, say, an embedded escape
* character. Personally, I think it's a stunningly bad idea. Other
* examples of problems this caused in historic vi are:
* :ab foo bar
* :ab foo baz
* results in "bar" being abbreviated to "baz", which wasn't what the
* user had in mind at all. Also, the commands:
* :ab foo bar
* :unab foo<space>
* resulted in an error message that "bar" wasn't mapped. Finally,
* since the string was already exploded by the time the unabbreviate
* command got it, all it knew was that an abbreviation had occurred.
* Cleverly, it checked the replacement string for its unabbreviation
* match, which meant that the commands:
* :ab foo1 bar
* :ab foo2 bar
* :unab foo2
* unabbreviate "foo1", and the commands:
* :ab foo bar
* :ab bar baz
* unabbreviate "foo"!
*
* Anyway, people neglected to first ask my opinion before they wrote
* macros that depend on this stuff, so, we make this work as follows.
* When checking for an abbreviation on the command line, if we get a
* string which is <blank> terminated and which starts at the beginning
* of the line, we check to see it is the abbreviate or unabbreviate
* commands. If it is, turn abbreviations off and return as if no
* abbreviation was found. Note also, minor trickiness, so that if
* the user erases the line and starts another command, we turn the
* abbreviations back on.
*
* This makes the layering look like a Nachos Supreme.
*/
search: if (isinfoline) {
if (off == tp->ai || off == tp->offset)
if (ex_is_abbrev(sp, p, len)) {
*turnoffp = 1;
return (0);
} else
*turnoffp = 0;
else
if (*turnoffp)
return (0);
}
/* Check for any abbreviations. */
if ((qp = seq_find(sp, NULL, NULL, p, len, SEQ_ABBREV, NULL)) == NULL)
return (0);
/*
* Push the abbreviation onto the tty stack. Historically, characters
* resulting from an abbreviation expansion were themselves subject to
* map expansions, O_SHOWMATCH matching etc. This means the expanded
* characters will be re-tested for abbreviations. It's difficult to
* know what historic practice in this case was, since abbreviations
* were applied to :colon command lines, so entering abbreviations that
* looped was tricky, although possible. In addition, obvious loops
* didn't work as expected. (The command ':ab a b|ab b c|ab c a' will
* silently only implement and/or display the last abbreviation.)
*
* This implementation doesn't recover well from such abbreviations.
* The main input loop counts abbreviated characters, and, when it
* reaches a limit, discards any abbreviated characters on the queue.
* It's difficult to back up to the original position, as the replay
* queue would have to be adjusted, and the line state when an initial
* abbreviated character was received would have to be saved.
*/
ch = *pushcp;
if (v_event_push(sp, NULL, &ch, 1, CH_ABBREVIATED))
return (1);
if (v_event_push(sp, NULL, qp->output, qp->olen, CH_ABBREVIATED))
return (1);
/*
* If the size of the abbreviation is larger than or equal to the size
* of the original text, move to the start of the replaced characters,
* and add their length to the overwrite count.
*
* If the abbreviation is smaller than the original text, we have to
* delete the additional overwrite characters and copy down any insert
* characters.
*/
tp->cno -= len;
if (qp->olen >= len)
tp->owrite += len;
else {
if (tp->insert)
MEMMOVEW(tp->lb + tp->cno + qp->olen,
tp->lb + tp->cno + tp->owrite + len, tp->insert);
tp->owrite += qp->olen;
tp->len -= len - qp->olen;
}
/*
* We return the length of the abbreviated characters. This is so
* the calling routine can replace the replay characters with the
* abbreviation. This means that subsequent '.' commands will produce
* the same text, regardless of intervening :[un]abbreviate commands.
* This is historic practice.
*/
*didsubp = len;
return (0);
}
/*
* txt_unmap --
* Handle the unmap command.
*/
static void
txt_unmap(SCR *sp, TEXT *tp, u_int32_t *ec_flagsp)
{
size_t len, off;
CHAR_T *p;
/* Find the beginning of this "word". */
for (off = tp->cno - 1, p = tp->lb + off, len = 0;; --p, --off) {
if (isblank(*p)) {
++p;
break;
}
++len;
if (off == tp->ai || off == tp->offset)
break;
}
/*
* !!!
* Historic vi exploded input mappings on the command line. See the
* txt_abbrev() routine for an explanation of the problems inherent
* in this.
*
* We make this work as follows. If we get a string which is <blank>
* terminated and which starts at the beginning of the line, we check
* to see it is the unmap command. If it is, we return that the input
* mapping should be turned off. Note also, minor trickiness, so that
* if the user erases the line and starts another command, we go ahead
* an turn mapping back on.
*/
if ((off == tp->ai || off == tp->offset) && ex_is_unmap(sp, p, len))
FL_CLR(*ec_flagsp, EC_MAPINPUT);
else
FL_SET(*ec_flagsp, EC_MAPINPUT);
}
/*
* txt_ai_resolve --
* When a line is resolved by <esc>, review autoindent characters.
*/
static void
txt_ai_resolve(SCR *sp, TEXT *tp, int *changedp)
{
u_long ts;
int delc;
size_t cno, len, new, old, scno, spaces, tab_after_sp, tabs;
CHAR_T *p;
*changedp = 0;
/*
* If the line is empty, has an offset, or no autoindent
* characters, we're done.
*/
if (!tp->len || tp->offset || !tp->ai)
return;
/*
* If the length is less than or equal to the autoindent
* characters, delete them.
*/
if (tp->len <= tp->ai) {
tp->ai = tp->cno = tp->len = 0;
return;
}
/*
* The autoindent characters plus any leading <blank> characters
* in the line are resolved into the minimum number of characters.
* Historic practice.
*/
ts = O_VAL(sp, O_TABSTOP);
/* Figure out the last <blank> screen column. */
for (p = tp->lb, scno = 0, len = tp->len,
spaces = tab_after_sp = 0; len-- && isblank(*p); ++p)
if (*p == '\t') {
if (spaces)
tab_after_sp = 1;
scno += COL_OFF(scno, ts);
} else {
++spaces;
++scno;
}
/*
* If there are no spaces, or no tabs after spaces and less than
* ts spaces, it's already minimal.
* Keep analysing if expandtabs is set.
*/
if ((!spaces || (!tab_after_sp && spaces < ts)) &&
!O_ISSET(sp, O_EXPANDTABS))
return;
/* Count up spaces/tabs needed to get to the target. */
cno = 0;
tabs = 0;
if (!O_ISSET(sp, O_EXPANDTABS)) {
for (; cno + COL_OFF(cno, ts) <= scno; ++tabs)
cno += COL_OFF(cno, ts);
}
spaces = scno - cno;
/*
* Figure out how many characters we're dropping -- if we're not
* dropping any, it's already minimal, we're done.
*/
old = p - tp->lb;
new = spaces + tabs;
if (old == new)
return;
/* Shift the rest of the characters down, adjust the counts. */
delc = old - new;
MEMMOVEW(p - delc, p, tp->len - old);
tp->len -= delc;
tp->cno -= delc;
/* Fill in space/tab characters. */
for (p = tp->lb; tabs--;)
*p++ = '\t';
while (spaces--)
*p++ = ' ';
*changedp = 1;
}
/*
* v_txt_auto --
* Handle autoindent. If aitp isn't NULL, use it, otherwise,
* retrieve the line.
*
* PUBLIC: int v_txt_auto __P((SCR *, db_recno_t, TEXT *, size_t, TEXT *));
*/
int
v_txt_auto(SCR *sp, db_recno_t lno, TEXT *aitp, size_t len, TEXT *tp)
{
size_t nlen;
CHAR_T *p, *t;
if (aitp == NULL) {
/*
* If the ex append command is executed with an address of 0,
* it's possible to get here with a line number of 0. Return
* an indent of 0.
*/
if (lno == 0) {
tp->ai = 0;
return (0);
}
if (db_get(sp, lno, DBG_FATAL, &t, &len))
return (1);
} else
t = aitp->lb;
/* Count whitespace characters. */
for (p = t; len > 0; ++p, --len)
if (!isblank(*p))
break;
/* Set count, check for no indentation. */
if ((nlen = (p - t)) == 0)
return (0);
/* Make sure the buffer's big enough. */
BINC_RETW(sp, tp->lb, tp->lb_len, tp->len + nlen);
/* Copy the buffer's current contents up. */
if (tp->len != 0)
MEMMOVEW(tp->lb + nlen, tp->lb, tp->len);
tp->len += nlen;
/* Copy the indentation into the new buffer. */
MEMMOVEW(tp->lb, t, nlen);
/* Set the autoindent count. */
tp->ai = nlen;
return (0);
}
/*
* txt_backup --
* Back up to the previously edited line.
*/
static TEXT *
txt_backup(SCR *sp, TEXTH *tiqh, TEXT *tp, u_int32_t *flagsp)
{
VI_PRIVATE *vip;
TEXT *ntp;
/* Get a handle on the previous TEXT structure. */
if ((ntp = tp->q.cqe_prev) == (void *)tiqh) {
if (!FL_ISSET(*flagsp, TXT_REPLAY))
msgq(sp, M_BERR,
"193|Already at the beginning of the insert");
return (tp);
}
/* Bookkeeping. */
ntp->len = ntp->sv_len;
/* Handle appending to the line. */
vip = VIP(sp);
if (ntp->owrite == 0 && ntp->insert == 0) {
ntp->lb[ntp->len] = CH_CURSOR;
++ntp->insert;
++ntp->len;
FL_SET(*flagsp, TXT_APPENDEOL);
} else
FL_CLR(*flagsp, TXT_APPENDEOL);
/* Release the current TEXT. */
CIRCLEQ_REMOVE(tiqh, tp, q);
text_free(tp);
/* Update the old line on the screen. */
if (vs_change(sp, ntp->lno + 1, LINE_DELETE))
return (NULL);
/* Return the new/current TEXT. */
return (ntp);
}
/*
* Text indentation is truly strange. ^T and ^D do movements to the next or
* previous shiftwidth value, i.e. for a 1-based numbering, with shiftwidth=3,
* ^T moves a cursor on the 7th, 8th or 9th column to the 10th column, and ^D
* moves it back.
*
* !!!
* The ^T and ^D characters in historical vi had special meaning only when they
* were the first characters entered after entering text input mode. As normal
* erase characters couldn't erase autoindent characters (^T in this case), it
* meant that inserting text into previously existing text was strange -- ^T
* only worked if it was the first keystroke(s), and then could only be erased
* using ^D. This implementation treats ^T specially anywhere it occurs in the
* input, and permits the standard erase characters to erase the characters it
* inserts.
*
* !!!
* A fun test is to try:
* :se sw=4 ai list
* i<CR>^Tx<CR>^Tx<CR>^Tx<CR>^Dx<CR>^Dx<CR>^Dx<esc>
* Historic vi loses some of the '$' marks on the line ends, but otherwise gets
* it right.
*
* XXX
* Technically, txt_dent should be part of the screen interface, as it requires
* knowledge of character sizes, including <space>s, on the screen. It's here
* because it's a complicated little beast, and I didn't want to shove it down
* into the screen. It's probable that KEY_LEN will call into the screen once
* there are screens with different character representations.
*
* txt_dent --
* Handle ^T indents, ^D outdents.
*
* If anything changes here, check the ex version to see if it needs similar
* changes.
*/
static int
txt_dent(SCR *sp, TEXT *tp, int isindent)
{
CHAR_T ch;
u_long sw, ts;
size_t cno, current, spaces, target, tabs;
ts = O_VAL(sp, O_TABSTOP);
sw = O_VAL(sp, O_SHIFTWIDTH);
/*
* Since we don't know what precedes the character(s) being inserted
* (or deleted), the preceding whitespace characters must be resolved.
* An example is a <tab>, which doesn't need a full shiftwidth number
* of columns because it's preceded by <space>s. This is easy to get
* if the user sets shiftwidth to a value less than tabstop (or worse,
* something for which tabstop isn't a multiple) and then uses ^T to
* indent, and ^D to outdent.
*
* Figure out the current and target screen columns. In the historic
* vi, the autoindent column was NOT determined using display widths
* of characters as was the wrapmargin column. For that reason, we
* can't use the vs_column() function, but have to calculate it here.
* This is slow, but it's normally only on the first few characters of
* a line.
*/
for (current = cno = 0; cno < tp->cno; ++cno)
current += tp->lb[cno] == '\t' ?
COL_OFF(current, ts) : KEY_COL(sp, tp->lb[cno]);
target = current;
if (isindent)
target += COL_OFF(target, sw);
else {
--target;
target -= target % sw;
}
/*
* Back up over any previous <blank> characters, changing them into
* overwrite characters (including any ai characters). Then figure
* out the current screen column.
*/
for (; tp->cno > tp->offset &&
(tp->lb[tp->cno - 1] == ' ' || tp->lb[tp->cno - 1] == '\t');
--tp->cno, ++tp->owrite);
for (current = cno = 0; cno < tp->cno; ++cno)
current += tp->lb[cno] == '\t' ?
COL_OFF(current, ts) : KEY_COL(sp, tp->lb[cno]);
/*
* If we didn't move up to or past the target, it's because there
* weren't enough characters to delete, e.g. the first character
* of the line was a tp->offset character, and the user entered
* ^D to move to the beginning of a line. An example of this is:
*
* :set ai sw=4<cr>i<space>a<esc>i^T^D
*
* Otherwise, count up the total spaces/tabs needed to get from the
* beginning of the line (or the last non-<blank> character) to the
* target.
*/
if (current >= target)
spaces = tabs = 0;
else {
cno = current;
tabs = 0;
if (!O_ISSET(sp, O_EXPANDTABS)) {
for (; cno + COL_OFF(cno, ts) <= target; ++tabs)
cno += COL_OFF(cno, ts);
}
spaces = target - cno;
}
tp->ai = tabs + spaces;
/*
* Call txt_insch() to insert each character, so that we get the
* correct effect when we add a <tab> to replace N <spaces>.
*/
for (ch = '\t'; tabs > 0; --tabs)
(void)txt_insch(sp, tp, &ch, 0);
for (ch = ' '; spaces > 0; --spaces)
(void)txt_insch(sp, tp, &ch, 0);
return (0);
}
/*
* txt_fc --
* File name completion.
*/
static int
txt_fc(SCR *sp, TEXT *tp, int *redrawp)
{
struct stat sb;
ARGS **argv;
CHAR_T s_ch;
EXCMD cmd;
size_t indx, len, nlen, off;
int argc, trydir;
CHAR_T *p, *t;
const char *np;
size_t nplen;
trydir = 0;
*redrawp = 0;
/*
* Find the beginning of this "word" -- if we're at the beginning
* of the line, it's a special case.
*/
if (tp->cno == 1) {
len = 0;
p = tp->lb;
} else
retry: for (len = 0,
off = tp->cno - 1, p = tp->lb + off;; --off, --p) {
if (isblank(*p)) {
++p;
break;
}
++len;
if (off == tp->ai || off == tp->offset)
break;
}
/*
* Get enough space for a wildcard character.
*
* XXX
* This won't work for "foo\", since the \ will escape the expansion
* character. I'm not sure if that's a bug or not...
*/
off = p - tp->lb;
BINC_RETW(sp, tp->lb, tp->lb_len, tp->len + 1);
p = tp->lb + off;
s_ch = p[len];
p[len] = '*';
/* Build an ex command, and call the ex expansion routines. */
ex_cinit(sp, &cmd, 0, 0, OOBLNO, OOBLNO, 0);
if (argv_exp2(sp, &cmd, p, len + 1)) {
p[len] = s_ch;
return (0);
}
argc = cmd.argc;
argv = cmd.argv;
p[len] = s_ch;
switch (argc) {
case 0: /* No matches. */
if (!trydir)
(void)sp->gp->scr_bell(sp);
return (0);
case 1: /* One match. */
/* If something changed, do the exchange. */
nlen = STRLEN(cmd.argv[0]->bp);
if (len != nlen || MEMCMP(cmd.argv[0]->bp, p, len))
break;
/* If haven't done a directory test, do it now. */
INT2CHAR(sp, cmd.argv[0]->bp, cmd.argv[0]->len + 1,
np, nplen);
if (!trydir &&
!stat(np, &sb) && S_ISDIR(sb.st_mode)) {
p += len;
goto isdir;
}
/* If nothing changed, period, ring the bell. */
if (!trydir)
(void)sp->gp->scr_bell(sp);
return (0);
default: /* Multiple matches. */
*redrawp = 1;
if (txt_fc_col(sp, argc, argv))
return (1);
/* Find the length of the shortest match. */
for (nlen = cmd.argv[0]->len; --argc > 0;) {
if (cmd.argv[argc]->len < nlen)
nlen = cmd.argv[argc]->len;
for (indx = 0; indx < nlen &&
cmd.argv[argc]->bp[indx] == cmd.argv[0]->bp[indx];
++indx);
nlen = indx;
}
break;
}
/* Overwrite the expanded text first. */
for (t = cmd.argv[0]->bp; len > 0 && nlen > 0; --len, --nlen)
*p++ = *t++;
/* If lost text, make the remaining old text overwrite characters. */
if (len) {
tp->cno -= len;
tp->owrite += len;
}
/* Overwrite any overwrite characters next. */
for (; nlen > 0 && tp->owrite > 0; --nlen, --tp->owrite, ++tp->cno)
*p++ = *t++;
/* Shift remaining text up, and move the cursor to the end. */
if (nlen) {
off = p - tp->lb;
BINC_RETW(sp, tp->lb, tp->lb_len, tp->len + nlen);
p = tp->lb + off;
tp->cno += nlen;
tp->len += nlen;
if (tp->insert != 0)
(void)MEMMOVEW(p + nlen, p, tp->insert);
while (nlen--)
*p++ = *t++;
}
/* If a single match and it's a directory, retry it. */
INT2CHAR(sp, cmd.argv[0]->bp, cmd.argv[0]->len + 1, np, nplen);
if (argc == 1 && !stat(np, &sb) && S_ISDIR(sb.st_mode)) {
isdir: if (tp->owrite == 0) {
off = p - tp->lb;
BINC_RETW(sp, tp->lb, tp->lb_len, tp->len + 1);
p = tp->lb + off;
if (tp->insert != 0)
(void)MEMMOVEW(p + 1, p, tp->insert);
++tp->len;
} else
--tp->owrite;
++tp->cno;
*p++ = '/';
trydir = 1;
goto retry;
}
return (0);
}
/*
* txt_fc_col --
* Display file names for file name completion.
*/
static int
txt_fc_col(SCR *sp, int argc, ARGS **argv)
{
ARGS **av;
CHAR_T *p;
GS *gp;
size_t base, cnt, col, colwidth, numrows, numcols, prefix, row;
int ac, nf, reset;
const char *np;
char *pp;
size_t nlen;
gp = sp->gp;
/* Trim any directory prefix common to all of the files. */
INT2CHAR(sp, argv[0]->bp, argv[0]->len + 1, np, nlen);
if ((pp = strrchr(np, '/')) == NULL)
prefix = 0;
else {
prefix = (pp - np) + 1;
for (ac = argc - 1, av = argv + 1; ac > 0; --ac, ++av)
if (av[0]->len < prefix ||
MEMCMP(av[0]->bp, argv[0]->bp,
prefix)) {
prefix = 0;
break;
}
}
/*
* Figure out the column width for the longest name. Output is done on
* 6 character "tab" boundaries for no particular reason. (Since we
* don't output tab characters, we ignore the terminal's tab settings.)
* Ignore the user's tab setting because we have no idea how reasonable
* it is.
*/
for (ac = argc, av = argv, colwidth = 0; ac > 0; --ac, ++av) {
for (col = 0, p = av[0]->bp + prefix; *p != '\0'; ++p)
col += KEY_LEN(sp, *p);
if (col > colwidth)
colwidth = col;
}
colwidth += COL_OFF(colwidth, 6);
/*
* Writing to the bottom line of the screen is always turned off when
* SC_TINPUT_INFO is set. Turn it back on, we know what we're doing.
*/
if (F_ISSET(sp, SC_TINPUT_INFO)) {
reset = 1;
F_CLR(sp, SC_TINPUT_INFO);
} else
reset = 0;
#define CHK_INTR \
if (F_ISSET(gp, G_INTERRUPTED)) \
goto intr;
/* If the largest file name is too large, just print them. */
if (colwidth > sp->cols) {
for (ac = argc, av = argv; ac > 0; --ac, ++av) {
INT2CHAR(sp, av[0]->bp+prefix, av[0]->len+1-prefix,
np, nlen);
pp = msg_print(sp, np, &nf);
(void)ex_printf(sp, "%s\n", pp);
if (F_ISSET(gp, G_INTERRUPTED))
break;
}
if (nf)
FREE_SPACE(sp, pp, 0);
CHK_INTR;
} else {
/* Figure out the number of columns. */
numcols = (sp->cols - 1) / colwidth;
if (argc > numcols) {
numrows = argc / numcols;
if (argc % numcols)
++numrows;
} else
numrows = 1;
/* Display the files in sorted order. */
for (row = 0; row < numrows; ++row) {
for (base = row, col = 0; col < numcols; ++col) {
INT2CHAR(sp, argv[base]->bp+prefix,
argv[base]->len+1-prefix, np, nlen);
pp = msg_print(sp, np, &nf);
cnt = ex_printf(sp, "%s", pp);
if (nf)
FREE_SPACE(sp, pp, 0);
CHK_INTR;
if ((base += numrows) >= argc)
break;
(void)ex_printf(sp,
"%*s", (int)(colwidth - cnt), "");
CHK_INTR;
}
(void)ex_puts(sp, "\n");
CHK_INTR;
}
(void)ex_puts(sp, "\n");
CHK_INTR;
}
(void)ex_fflush(sp);
if (0) {
intr: F_CLR(gp, G_INTERRUPTED);
}
if (reset)
F_SET(sp, SC_TINPUT_INFO);
return (0);
}
/*
* txt_emark --
* Set the end mark on the line.
*/
static int
txt_emark(SCR *sp, TEXT *tp, size_t cno)
{
CHAR_T ch;
unsigned char *kp;
size_t chlen, nlen, olen;
CHAR_T *p;
ch = CH_ENDMARK;
/*
* The end mark may not be the same size as the current character.
* Don't let the line shift.
*/
nlen = KEY_LEN(sp, ch);
if (tp->lb[cno] == '\t')
(void)vs_columns(sp, tp->lb, tp->lno, &cno, &olen);
else
olen = KEY_LEN(sp, tp->lb[cno]);
/*
* If the line got longer, well, it's weird, but it's easy. If
* it's the same length, it's easy. If it got shorter, we have
* to fix it up.
*/
if (olen > nlen) {
BINC_RETW(sp, tp->lb, tp->lb_len, tp->len + olen);
chlen = olen - nlen;
if (tp->insert != 0)
MEMMOVEW(tp->lb + cno + 1 + chlen,
tp->lb + cno + 1, tp->insert);
tp->len += chlen;
tp->owrite += chlen;
p = tp->lb + cno;
if (tp->lb[cno] == '\t')
for (cno += chlen; chlen--;)
*p++ = ' ';
else
for (kp = KEY_NAME(sp, tp->lb[cno]),
cno += chlen; chlen--;)
*p++ = *kp++;
}
tp->lb[cno] = ch;
return (vs_change(sp, tp->lno, LINE_RESET));
}
/*
* txt_err --
* Handle an error during input processing.
*/
static void
txt_err(SCR *sp, TEXTH *tiqh)
{
db_recno_t lno;
/*
* The problem with input processing is that the cursor is at an
* indeterminate position since some input may have been lost due
* to a malloc error. So, try to go back to the place from which
* the cursor started, knowing that it may no longer be available.
*
* We depend on at least one line number being set in the text
* chain.
*/
for (lno = tiqh->cqh_first->lno;
!db_exist(sp, lno) && lno > 0; --lno);
sp->lno = lno == 0 ? 1 : lno;
sp->cno = 0;
/* Redraw the screen, just in case. */
F_SET(sp, SC_SCR_REDRAW);
}
/*
* txt_hex --
* Let the user insert any character value they want.
*
* !!!
* This is an extension. The pattern "^X[0-9a-fA-F]*" is a way
* for the user to specify a character value which their keyboard
* may not be able to enter.
*/
static int
txt_hex(SCR *sp, TEXT *tp)
{
CHAR_T savec;
size_t len, off;
u_long value;
CHAR_T *p, *wp;
/*
* Null-terminate the string. Since nul isn't a legal hex value,
* this should be okay, and lets us use a local routine, which
* presumably understands the character set, to convert the value.
*/
savec = tp->lb[tp->cno];
tp->lb[tp->cno] = 0;
/* Find the previous CH_HEX character. */
for (off = tp->cno - 1, p = tp->lb + off, len = 0;; --p, --off, ++len) {
if (*p == CH_HEX) {
wp = p + 1;
break;
}
/* Not on this line? Shouldn't happen. */
if (off == tp->ai || off == tp->offset)
goto nothex;
}
/* If length of 0, then it wasn't a hex value. */
if (len == 0)
goto nothex;
/* Get the value. */
errno = 0;
value = STRTOL(wp, NULL, 16);
if (errno || value > MAX_CHAR_T) {
nothex: tp->lb[tp->cno] = savec;
return (0);
}
/* Restore the original character. */
tp->lb[tp->cno] = savec;
/* Adjust the bookkeeping. */
tp->cno -= len;
tp->len -= len;
tp->lb[tp->cno - 1] = value;
/* Copy down any overwrite characters. */
if (tp->owrite)
MEMMOVEW(tp->lb + tp->cno, tp->lb + tp->cno + len,
tp->owrite);
/* Copy down any insert characters. */
if (tp->insert)
MEMMOVEW(tp->lb + tp->cno + tp->owrite,
tp->lb + tp->cno + tp->owrite + len,
tp->insert);
return (0);
}
/*
* txt_insch --
*
* !!!
* Historic vi did a special screen optimization for tab characters. As an
* example, for the keystrokes "iabcd<esc>0C<tab>", the tab overwrote the
* rest of the string when it was displayed.
*
* Because early versions of this implementation redisplayed the entire line
* on each keystroke, the "bcd" was pushed to the right as it ignored that
* the user had "promised" to change the rest of the characters. However,
* the historic vi implementation had an even worse bug: given the keystrokes
* "iabcd<esc>0R<tab><esc>", the "bcd" disappears, and magically reappears
* on the second <esc> key.
*
* POSIX 1003.2 requires (will require) that this be fixed, specifying that
* vi overwrite characters the user has committed to changing, on the basis
* of the screen space they require, but that it not overwrite other characters.
*/
static int
txt_insch(SCR *sp, TEXT *tp, CHAR_T *chp, u_int flags)
{
unsigned char *kp;
CHAR_T savech;
size_t chlen, cno, copydown, olen, nlen;
CHAR_T *p;
/*
* The 'R' command does one-for-one replacement, because there's
* no way to know how many characters the user intends to replace.
*/
if (LF_ISSET(TXT_REPLACE)) {
if (tp->owrite) {
--tp->owrite;
tp->lb[tp->cno++] = *chp;
return (0);
}
} else if (tp->owrite) { /* Overwrite a character. */
cno = tp->cno;
/*
* If the old or new characters are tabs, then the length of the
* display depends on the character position in the display. We
* don't even try to handle this here, just ask the screen.
*/
if (*chp == '\t') {
savech = tp->lb[cno];
tp->lb[cno] = '\t';
(void)vs_columns(sp, tp->lb, tp->lno, &cno, &nlen);
tp->lb[cno] = savech;
} else
nlen = KEY_LEN(sp, *chp);
/*
* Eat overwrite characters until we run out of them or we've
* handled the length of the new character. If we only eat
* part of an overwrite character, break it into its component
* elements and display the remaining components.
*/
for (copydown = 0; nlen != 0 && tp->owrite != 0;) {
--tp->owrite;
if (tp->lb[cno] == '\t')
(void)vs_columns(sp,
tp->lb, tp->lno, &cno, &olen);
else
olen = KEY_LEN(sp, tp->lb[cno]);
if (olen == nlen) {
nlen = 0;
break;
}
if (olen < nlen) {
++copydown;
nlen -= olen;
} else {
BINC_RETW(sp,
tp->lb, tp->lb_len, tp->len + olen);
chlen = olen - nlen;
MEMMOVEW(tp->lb + cno + 1 + chlen,
tp->lb + cno + 1,
tp->owrite + tp->insert);
tp->len += chlen;
tp->owrite += chlen;
if (tp->lb[cno] == '\t')
for (p = tp->lb + cno + 1; chlen--;)
*p++ = ' ';
else
for (kp =
KEY_NAME(sp, tp->lb[cno]) + nlen,
p = tp->lb + cno + 1; chlen--;)
*p++ = *kp++;
nlen = 0;
break;
}
}
/*
* If had to erase several characters, we adjust the total
* count, and if there are any characters left, shift them
* into position.
*/
if (copydown != 0 && (tp->len -= copydown) != 0)
MEMMOVEW(tp->lb + cno, tp->lb + cno + copydown,
tp->owrite + tp->insert + copydown);
/* If we had enough overwrite characters, we're done. */
if (nlen == 0) {
tp->lb[tp->cno++] = *chp;
return (0);
}
}
/* Check to see if the character fits into the input buffer. */
BINC_RETW(sp, tp->lb, tp->lb_len, tp->len + 1);
++tp->len;
if (tp->insert) { /* Insert a character. */
if (tp->insert == 1)
tp->lb[tp->cno + 1] = tp->lb[tp->cno];
else
MEMMOVEW(tp->lb + tp->cno + 1,
tp->lb + tp->cno, tp->owrite + tp->insert);
}
tp->lb[tp->cno++] = *chp;
return (0);
}
/*
* txt_isrch --
* Do an incremental search.
*/
static int
txt_isrch(SCR *sp, VICMD *vp, TEXT *tp, u_int8_t *is_flagsp)
{
MARK start;
db_recno_t lno;
u_int sf;
/* If it's a one-line screen, we don't do incrementals. */
if (IS_ONELINE(sp)) {
FL_CLR(*is_flagsp, IS_RUNNING);
return (0);
}
/*
* If the user erases back to the beginning of the buffer, there's
* nothing to search for. Reset the cursor to the starting point.
*/
if (tp->cno <= 1) {
vp->m_final = vp->m_start;
return (0);
}
/*
* If it's an RE quote character, and not quoted, ignore it until
* we get another character.
*/
if (tp->lb[tp->cno - 1] == '\\' &&
(tp->cno == 2 || tp->lb[tp->cno - 2] != '\\'))
return (0);
/*
* If it's a magic shell character, and not quoted, reset the cursor
* to the starting point.
*/
if (strchr(O_STR(sp, O_SHELLMETA), tp->lb[tp->cno - 1]) != NULL &&
(tp->cno == 2 || tp->lb[tp->cno - 2] != '\\'))
vp->m_final = vp->m_start;
/*
* If we see the search pattern termination character, then quit doing
* an incremental search. There may be more, e.g., ":/foo/;/bar/",
* and we can't handle that incrementally. Also, reset the cursor to
* the original location, the ex search routines don't know anything
* about incremental searches.
*/
if (tp->lb[0] == tp->lb[tp->cno - 1] &&
(tp->cno == 2 || tp->lb[tp->cno - 2] != '\\')) {
vp->m_final = vp->m_start;
FL_CLR(*is_flagsp, IS_RUNNING);
return (0);
}
/*
* Remember the input line and discard the special input map,
* but don't overwrite the input line on the screen.
*/
lno = tp->lno;
F_SET(VIP(sp), VIP_S_MODELINE);
F_CLR(sp, SC_TINPUT | SC_TINPUT_INFO);
if (txt_map_end(sp))
return (1);
/*
* Specify a starting point and search. If we find a match, move to
* it and refresh the screen. If we didn't find the match, then we
* beep the screen. When searching from the original cursor position,
* we have to move the cursor, otherwise, we don't want to move the
* cursor in case the text at the current position continues to match.
*/
if (FL_ISSET(*is_flagsp, IS_RESTART)) {
start = vp->m_start;
sf = SEARCH_SET;
} else {
start = vp->m_final;
sf = SEARCH_INCR | SEARCH_SET;
}
if (tp->lb[0] == '/' ?
!f_search(sp,
&start, &vp->m_final, tp->lb + 1, tp->cno - 1, NULL, sf) :
!b_search(sp,
&start, &vp->m_final, tp->lb + 1, tp->cno - 1, NULL, sf)) {
sp->lno = vp->m_final.lno;
sp->cno = vp->m_final.cno;
FL_CLR(*is_flagsp, IS_RESTART);
if (!KEYS_WAITING(sp) && vs_refresh(sp, 0))
return (1);
} else
FL_SET(*is_flagsp, IS_RESTART);
/* Reinstantiate the special input map. */
if (txt_map_init(sp))
return (1);
F_CLR(VIP(sp), VIP_S_MODELINE);
F_SET(sp, SC_TINPUT | SC_TINPUT_INFO);
/* Reset the line number of the input line. */
tp->lno = TMAP[0].lno;
/*
* If the colon command-line moved, i.e. the screen scrolled,
* refresh the input line.
*
* XXX
* We shouldn't be calling vs_line, here -- we need dirty bits
* on entries in the SMAP array.
*/
if (lno != TMAP[0].lno) {
if (vs_line(sp, &TMAP[0], NULL, NULL))
return (1);
(void)sp->gp->scr_refresh(sp, 0);
}
return (0);
}
/*
* txt_resolve --
* Resolve the input text chain into the file.
*/
static int
txt_resolve(SCR *sp, TEXTH *tiqh, u_int32_t flags)
{
VI_PRIVATE *vip;
TEXT *tp;
db_recno_t lno;
int changed;
/*
* The first line replaces a current line, and all subsequent lines
* are appended into the file. Resolve autoindented characters for
* each line before committing it. If the latter causes the line to
* change, we have to redisplay it, otherwise the information cached
* about the line will be wrong.
*/
vip = VIP(sp);
tp = tiqh->cqh_first;
if (LF_ISSET(TXT_AUTOINDENT))
txt_ai_resolve(sp, tp, &changed);
else
changed = 0;
if (db_set(sp, tp->lno, tp->lb, tp->len) ||
(changed && vs_change(sp, tp->lno, LINE_RESET)))
return (1);
for (lno = tp->lno; (tp = tp->q.cqe_next) != (void *)&sp->tiq; ++lno) {
if (LF_ISSET(TXT_AUTOINDENT))
txt_ai_resolve(sp, tp, &changed);
else
changed = 0;
if (db_append(sp, 0, lno, tp->lb, tp->len) ||
(changed && vs_change(sp, tp->lno, LINE_RESET)))
return (1);
}
/*
* Clear the input flag, the look-aside buffer is no longer valid.
* Has to be done as part of text resolution, or upon return we'll
* be looking at incorrect data.
*/
F_CLR(sp, SC_TINPUT);
return (0);
}
/*
* txt_showmatch --
* Show a character match.
*
* !!!
* Historic vi tried to display matches even in the :colon command line.
* I think not.
*/
static int
txt_showmatch(SCR *sp, TEXT *tp)
{
GS *gp;
VCS cs;
MARK m;
int cnt, endc, startc;
gp = sp->gp;
/*
* Do a refresh first, in case we haven't done one in awhile,
* so the user can see what we're complaining about.
*/
UPDATE_POSITION(sp, tp);
if (vs_refresh(sp, 1))
return (1);
/*
* We don't display the match if it's not on the screen. Find
* out what the first character on the screen is.
*/
if (vs_sm_position(sp, &m, 0, P_TOP))
return (1);
/* Initialize the getc() interface. */
cs.cs_lno = tp->lno;
cs.cs_cno = tp->cno - 1;
if (cs_init(sp, &cs))
return (1);
startc = (endc = cs.cs_ch) == ')' ? '(' : '{';
/* Search for the match. */
for (cnt = 1;;) {
if (cs_prev(sp, &cs))
return (1);
if (cs.cs_flags != 0) {
if (cs.cs_flags == CS_EOF || cs.cs_flags == CS_SOF) {
msgq(sp, M_BERR,
"Unmatched %s", KEY_NAME(sp, endc));
return (0);
}
continue;
}
if (cs.cs_ch == endc)
++cnt;
else if (cs.cs_ch == startc && --cnt == 0)
break;
}
/* If the match is on the screen, move to it. */
if (cs.cs_lno < m.lno || (cs.cs_lno == m.lno && cs.cs_cno < m.cno))
return (0);
sp->lno = cs.cs_lno;
sp->cno = cs.cs_cno;
if (vs_refresh(sp, 1))
return (1);
/* Wait for timeout or character arrival. */
return (v_event_get(sp,
NULL, O_VAL(sp, O_MATCHTIME) * 100, EC_TIMEOUT));
}
/*
* txt_margin --
* Handle margin wrap.
*/
static int
txt_margin(SCR *sp, TEXT *tp, TEXT *wmtp, int *didbreak, u_int32_t flags)
{
VI_PRIVATE *vip;
size_t len, off;
CHAR_T *p, *wp;
/* Find the nearest previous blank. */
for (off = tp->cno - 1, p = tp->lb + off, len = 0;; --off, --p, ++len) {
if (isblank(*p)) {
wp = p + 1;
break;
}
/*
* If reach the start of the line, there's nowhere to break.
*
* !!!
* Historic vi belled each time a character was entered after
* crossing the margin until a space was entered which could
* be used to break the line. I don't as it tends to wake the
* cats.
*/
if (off == tp->ai || off == tp->offset) {
*didbreak = 0;
return (0);
}
}
/*
* Store saved information about the rest of the line in the
* wrapmargin TEXT structure.
*
* !!!
* The offset field holds the length of the current characters
* that the user entered, but which are getting split to the new
* line -- it's going to be used to set the cursor value when we
* move to the new line.
*/
vip = VIP(sp);
wmtp->lb = p + 1;
wmtp->offset = len;
wmtp->insert = LF_ISSET(TXT_APPENDEOL) ? tp->insert - 1 : tp->insert;
wmtp->owrite = tp->owrite;
/* Correct current bookkeeping information. */
tp->cno -= len;
if (LF_ISSET(TXT_APPENDEOL)) {
tp->len -= len + tp->owrite + (tp->insert - 1);
tp->insert = 1;
} else {
tp->len -= len + tp->owrite + tp->insert;
tp->insert = 0;
}
tp->owrite = 0;
/*
* !!!
* Delete any trailing whitespace from the current line.
*/
for (;; --p, --off) {
if (!isblank(*p))
break;
--tp->cno;
--tp->len;
if (off == tp->ai || off == tp->offset)
break;
}
*didbreak = 1;
return (0);
}
/*
* txt_Rresolve --
* Resolve the input line for the 'R' command.
*/
static void
txt_Rresolve(SCR *sp, TEXTH *tiqh, TEXT *tp, const size_t orig_len)
{
TEXT *ttp;
size_t input_len, retain;
CHAR_T *p;
/*
* Check to make sure that the cursor hasn't moved beyond
* the end of the line.
*/
if (tp->owrite == 0)
return;
/*
* Calculate how many characters the user has entered,
* plus the blanks erased by <carriage-return>/<newline>s.
*/
for (ttp = tiqh->cqh_first, input_len = 0;;) {
input_len += ttp == tp ? tp->cno : ttp->len + ttp->R_erase;
if ((ttp = ttp->q.cqe_next) == (void *)&sp->tiq)
break;
}
/*
* If the user has entered less characters than the original line
* was long, restore any overwriteable characters to the original
* characters. These characters are entered as "insert characters",
* because they're after the cursor and we don't want to lose them.
* (This is okay because the R command has no insert characters.)
* We set owrite to 0 so that the insert characters don't get copied
* to somewhere else, which means that the line and the length have
* to be adjusted here as well.
*
* We have to retrieve the original line because the original pinned
* page has long since been discarded. If it doesn't exist, that's
* okay, the user just extended the file.
*/
if (input_len < orig_len) {
retain = MIN(tp->owrite, orig_len - input_len);
if (db_get(sp,
tiqh->cqh_first->lno, DBG_FATAL | DBG_NOCACHE, &p, NULL))
return;
MEMCPYW(tp->lb + tp->cno, p + input_len, retain);
tp->len -= tp->owrite - retain;
tp->owrite = 0;
tp->insert += retain;
}
}
/*
* txt_nomorech --
* No more characters message.
*/
static void
txt_nomorech(SCR *sp)
{
msgq(sp, M_BERR, "194|No more characters to erase");
}