430 lines
11 KiB
C
430 lines
11 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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* Keith Bostic. All rights reserved.
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*
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* See the LICENSE file for redistribution information.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)ex_txt.c 10.13 (Berkeley) 3/6/96";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <bitstring.h>
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#include <ctype.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../common/common.h"
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/*
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* !!!
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* The backslash characters was special when it preceded a newline as part of
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* a substitution replacement pattern. For example, the input ":a\<cr>" would
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* failed immediately with an error, as the <cr> wasn't part of a substitution
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* replacement pattern. This implies a frightening integration of the editor
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* and the parser and/or the RE engine. There's no way I'm going to reproduce
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* those semantics.
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*
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* So, if backslashes are special, this code inserts the backslash and the next
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* character into the string, without regard for the character or the command
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* being entered. Since "\<cr>" was illegal historically (except for the one
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* special case), and the command will fail eventually, no historical scripts
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* should break (presuming they didn't depend on the failure mode itself or the
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* characters remaining when failure occurred.
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*/
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static int txt_dent __P((SCR *, TEXT *));
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static void txt_prompt __P((SCR *, TEXT *, ARG_CHAR_T, u_int32_t));
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/*
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* ex_txt --
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* Get lines from the terminal for ex.
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*
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* PUBLIC: int ex_txt __P((SCR *, TEXTH *, ARG_CHAR_T, u_int32_t));
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*/
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int
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ex_txt(sp, tiqh, prompt, flags)
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SCR *sp;
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TEXTH *tiqh;
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ARG_CHAR_T prompt;
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u_int32_t flags;
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{
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EVENT ev;
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GS *gp;
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TEXT ait, *ntp, *tp;
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carat_t carat_st;
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size_t cnt;
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int rval;
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rval = 0;
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/*
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* Get a TEXT structure with some initial buffer space, reusing the
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* last one if it's big enough. (All TEXT bookkeeping fields default
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* to 0 -- text_init() handles this.)
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*/
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if (tiqh->cqh_first != (void *)tiqh) {
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tp = tiqh->cqh_first;
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if (tp->q.cqe_next != (void *)tiqh || tp->lb_len < 32) {
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text_lfree(tiqh);
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goto newtp;
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}
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tp->len = 0;
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} else {
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newtp: if ((tp = text_init(sp, NULL, 0, 32)) == NULL)
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goto err;
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CIRCLEQ_INSERT_HEAD(tiqh, tp, q);
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}
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/* Set the starting line number. */
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tp->lno = sp->lno + 1;
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/*
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* If it's a terminal, set up autoindent, put out the prompt, and
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* set it up so we know we were suspended. Otherwise, turn off
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* the autoindent flag, as that requires less special casing below.
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*
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* XXX
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* Historic practice is that ^Z suspended command mode (but, because
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* it ran in cooked mode, it was unaffected by the autowrite option.)
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* On restart, any "current" input was discarded, whether in insert
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* mode or not, and ex was in command mode. This code matches historic
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* practice, but not 'cause it's easier.
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*/
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gp = sp->gp;
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if (F_ISSET(gp, G_STDIN_TTY)) {
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if (LF_ISSET(TXT_AUTOINDENT)) {
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LF_SET(TXT_EOFCHAR);
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if (v_txt_auto(sp, sp->lno, NULL, 0, tp))
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goto err;
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}
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txt_prompt(sp, tp, prompt, flags);
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} else
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LF_CLR(TXT_AUTOINDENT);
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for (carat_st = C_NOTSET;;) {
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if (v_event_get(sp, &ev, 0, 0))
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goto err;
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/* Deal with all non-character events. */
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switch (ev.e_event) {
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case E_CHARACTER:
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break;
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case E_ERR:
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goto err;
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case E_REPAINT:
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continue;
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case E_EOF:
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rval = 1;
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/* FALLTHROUGH */
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case E_INTERRUPT:
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/*
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* Handle EOF/SIGINT events by discarding partially
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* entered text and returning. EOF returns failure,
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* E_INTERRUPT returns success.
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*/
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goto notlast;
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default:
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v_event_err(sp, &ev);
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goto notlast;
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}
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/*
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* Deal with character events.
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*
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* Check to see if the character fits into the input buffer.
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* (Use tp->len, ignore overwrite and non-printable chars.)
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*/
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BINC_GOTO(sp, tp->lb, tp->lb_len, tp->len + 1);
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switch (ev.e_value) {
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case K_CR:
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/*
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* !!!
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* Historically, <carriage-return>'s in the command
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* weren't special, so the ex parser would return an
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* unknown command error message. However, if they
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* terminated the command if they were in a map. I'm
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* pretty sure this still isn't right, but it handles
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* what I've seen so far.
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*/
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if (!F_ISSET(&ev.e_ch, CH_MAPPED))
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goto ins_ch;
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/* FALLTHROUGH */
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case K_NL:
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/*
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* '\' can escape <carriage-return>/<newline>. Toss
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* the backslash.
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*/
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if (LF_ISSET(TXT_BACKSLASH) &&
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tp->len != 0 && tp->lb[tp->len - 1] == '\\') {
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--tp->len;
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goto ins_ch;
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}
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/*
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* CR returns from the ex command line.
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*
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* XXX
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* Terminate with a nul, needed by filter.
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*/
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if (LF_ISSET(TXT_CR)) {
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tp->lb[tp->len] = '\0';
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goto done;
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}
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/*
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* '.' may terminate text input mode; free the current
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* TEXT.
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*/
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if (LF_ISSET(TXT_DOTTERM) && tp->len == tp->ai + 1 &&
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tp->lb[tp->len - 1] == '.') {
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notlast: CIRCLEQ_REMOVE(tiqh, tp, q);
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text_free(tp);
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goto done;
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}
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/* Set up bookkeeping for the new line. */
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if ((ntp = text_init(sp, NULL, 0, 32)) == NULL)
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goto err;
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ntp->lno = tp->lno + 1;
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/*
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* Reset the autoindent line value. 0^D keeps the ai
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* line from changing, ^D changes the level, even if
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* there were no characters in the old line. Note, if
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* using the current tp structure, use the cursor as
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* the length, the autoindent characters may have been
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* erased.
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*/
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if (LF_ISSET(TXT_AUTOINDENT)) {
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if (carat_st == C_NOCHANGE) {
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if (v_txt_auto(sp,
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OOBLNO, &ait, ait.ai, ntp))
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goto err;
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free(ait.lb);
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} else
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if (v_txt_auto(sp,
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OOBLNO, tp, tp->len, ntp))
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goto err;
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carat_st = C_NOTSET;
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}
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txt_prompt(sp, ntp, prompt, flags);
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/*
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* Swap old and new TEXT's, and insert the new TEXT
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* into the queue.
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*/
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tp = ntp;
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CIRCLEQ_INSERT_TAIL(tiqh, tp, q);
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break;
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case K_CARAT: /* Delete autoindent chars. */
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if (tp->len <= tp->ai && LF_ISSET(TXT_AUTOINDENT))
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carat_st = C_CARATSET;
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goto ins_ch;
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case K_ZERO: /* Delete autoindent chars. */
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if (tp->len <= tp->ai && LF_ISSET(TXT_AUTOINDENT))
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carat_st = C_ZEROSET;
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goto ins_ch;
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case K_CNTRLD: /* Delete autoindent char. */
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/*
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* !!!
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* Historically, the ^D command took (but then ignored)
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* a count. For simplicity, we don't return it unless
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* it's the first character entered. The check for len
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* equal to 0 is okay, TXT_AUTOINDENT won't be set.
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*/
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if (LF_ISSET(TXT_CNTRLD)) {
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for (cnt = 0; cnt < tp->len; ++cnt)
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if (!isblank(tp->lb[cnt]))
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break;
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if (cnt == tp->len) {
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tp->len = 1;
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tp->lb[0] = ev.e_c;
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tp->lb[1] = '\0';
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/*
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* Put out a line separator, in case
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* the command fails.
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*/
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(void)putchar('\n');
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goto done;
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}
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}
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/*
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* POSIX 1003.1b-1993, paragraph 7.1.1.9, states that
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* the EOF characters are discarded if there are other
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* characters to process in the line, i.e. if the EOF
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* is not the first character in the line. For this
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* reason, historic ex discarded the EOF characters,
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* even if occurring in the middle of the input line.
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* We match that historic practice.
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*
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* !!!
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* The test for discarding in the middle of the line is
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* done in the switch, because the CARAT forms are N+1,
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* not N.
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*
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* !!!
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* There's considerable magic to make the terminal code
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* return the EOF character at all. See that code for
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* details.
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*/
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if (!LF_ISSET(TXT_AUTOINDENT) || tp->len == 0)
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continue;
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switch (carat_st) {
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case C_CARATSET: /* ^^D */
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if (tp->len > tp->ai + 1)
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continue;
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/* Save the ai string for later. */
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ait.lb = NULL;
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ait.lb_len = 0;
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BINC_GOTO(sp, ait.lb, ait.lb_len, tp->ai);
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memmove(ait.lb, tp->lb, tp->ai);
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ait.ai = ait.len = tp->ai;
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carat_st = C_NOCHANGE;
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goto leftmargin;
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case C_ZEROSET: /* 0^D */
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if (tp->len > tp->ai + 1)
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continue;
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carat_st = C_NOTSET;
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leftmargin: (void)gp->scr_ex_adjust(sp, EX_TERM_CE);
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tp->ai = tp->len = 0;
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break;
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case C_NOTSET: /* ^D */
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if (tp->len > tp->ai)
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continue;
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if (txt_dent(sp, tp))
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goto err;
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break;
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default:
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abort();
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}
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/* Clear and redisplay the line. */
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(void)gp->scr_ex_adjust(sp, EX_TERM_CE);
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txt_prompt(sp, tp, prompt, flags);
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break;
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default:
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/*
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* See the TXT_BEAUTIFY comment in vi/v_txt_ev.c.
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*
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* Silently eliminate any iscntrl() character that was
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* not already handled specially, except for <tab> and
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* <ff>.
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*/
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ins_ch: if (LF_ISSET(TXT_BEAUTIFY) && iscntrl(ev.e_c) &&
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ev.e_value != K_FORMFEED && ev.e_value != K_TAB)
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break;
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tp->lb[tp->len++] = ev.e_c;
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break;
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}
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}
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/* NOTREACHED */
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done: return (rval);
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err:
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alloc_err:
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return (1);
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}
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/*
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* txt_prompt --
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* Display the ex prompt, line number, ai characters. Characters had
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* better be printable by the terminal driver, but that's its problem,
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* not ours.
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*/
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static void
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txt_prompt(sp, tp, prompt, flags)
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SCR *sp;
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TEXT *tp;
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ARG_CHAR_T prompt;
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u_int32_t flags;
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{
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/* Display the prompt. */
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if (LF_ISSET(TXT_PROMPT))
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(void)printf("%c", prompt);
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/* Display the line number. */
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if (LF_ISSET(TXT_NUMBER) && O_ISSET(sp, O_NUMBER))
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(void)printf("%6lu ", (u_long)tp->lno);
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/* Print out autoindent string. */
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if (LF_ISSET(TXT_AUTOINDENT))
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(void)printf("%.*s", (int)tp->ai, tp->lb);
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(void)fflush(stdout);
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}
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/*
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* txt_dent --
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* Handle ^D outdents.
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*
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* Ex version of vi/v_ntext.c:txt_dent(). See that code for the (usual)
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* ranting and raving. This is a fair bit simpler as ^T isn't special.
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*/
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static int
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txt_dent(sp, tp)
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SCR *sp;
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TEXT *tp;
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{
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u_long sw, ts;
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size_t cno, off, scno, spaces, tabs;
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ts = O_VAL(sp, O_TABSTOP);
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sw = O_VAL(sp, O_SHIFTWIDTH);
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/* Get the current screen column. */
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for (off = scno = 0; off < tp->len; ++off)
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if (tp->lb[off] == '\t')
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scno += COL_OFF(scno, ts);
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else
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++scno;
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/* Get the previous shiftwidth column. */
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cno = scno;
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scno -= --scno % sw;
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/*
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* Since we don't know what comes before the character(s) being
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* deleted, we have to resolve the autoindent characters . The
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* example is a <tab>, which doesn't take up a full shiftwidth
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* number of columns because it's preceded by <space>s. This is
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* easy to get if the user sets shiftwidth to a value less than
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* tabstop, and then uses ^T to indent, and ^D to outdent.
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*
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* Count up spaces/tabs needed to get to the target.
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*/
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for (cno = 0, tabs = 0; cno + COL_OFF(cno, ts) <= scno; ++tabs)
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cno += COL_OFF(cno, ts);
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spaces = scno - cno;
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/* Make sure there's enough room. */
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BINC_RET(sp, tp->lb, tp->lb_len, tabs + spaces + 1);
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/* Adjust the final ai character count. */
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tp->ai = tabs + spaces;
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/* Enter the replacement characters. */
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for (tp->len = 0; tabs > 0; --tabs)
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tp->lb[tp->len++] = '\t';
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for (; spaces > 0; --spaces)
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tp->lb[tp->len++] = ' ';
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return (0);
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}
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