360 lines
7.9 KiB
C
360 lines
7.9 KiB
C
/*
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* Copyright (c) 1988 Mark Nudleman
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)output.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#ifndef lint
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static const char rcsid[] =
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"$Id$";
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#endif /* not lint */
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/*
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* High level routines dealing with the output to the screen.
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include "less.h"
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int errmsgs; /* Count of messages displayed by error() */
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extern int bs_mode;
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extern int sigs;
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extern int sc_width, sc_height;
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extern int ul_width, ue_width;
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extern int so_width, se_width;
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extern int bo_width, be_width;
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extern int tabstop;
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extern int screen_trashed;
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extern int any_display;
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extern char *line;
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extern int horiz_off;
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extern int mode_flags;
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static int last_pos_highlighted = 0;
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/* static markup()
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*
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* Output correct markup char; return number of columns eaten-up.
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* Called by put_line() just before doing any actual output.
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*/
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#define ENTER 1
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#define ACQUIESCE 0 /* XXX Check actual def'n... */
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#define EXIT -1
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static
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markup(ent_ul, ent_bo)
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int *ent_ul, *ent_bo;
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{
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int retr;
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retr = 0;
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switch (*ent_ul) {
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case ENTER:
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ul_enter();
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retr += ul_width;
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break;
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case EXIT:
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ul_exit();
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retr += ue_width;
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break;
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}
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switch (*ent_bo) {
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case ENTER:
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bo_enter();
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retr += bo_width;
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break;
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case EXIT:
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bo_exit();
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retr += be_width;
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break;
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}
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*ent_ul = *ent_bo = ACQUIESCE;
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return retr;
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}
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/* put_line()
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*
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* Display the line which is in the line buffer. The number of output
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* characters in the line buffer cannot exceed screen columns available.
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* Output characters in the line buffer that precede horiz_off are skipped.
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* The caller may depend on this behaviour to ensure that the number of output
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* characters in the line buffer does not exceed the screen columns
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* available.
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*
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* This routine will get confused if the line buffer has non-sensical
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* UL_CHAR, UE_CHAR, BO_CHAR, BE_CHAR markups.
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*/
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#define MAYPUTCHR(char) \
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if (column >= eff_horiz_off) { \
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column += markup(&ent_ul, &ent_bo); \
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putchr(char); \
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}
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put_line()
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{
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register char *p;
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register int c;
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register int column;
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extern int auto_wrap, ignaw;
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int ent_ul, ent_bo; /* enter or exit ul|bo mode for next char */
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int eff_horiz_off;
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if (sigs)
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{
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/*
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* Don't output if a signal is pending.
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*/
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screen_trashed = 1;
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return;
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}
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if (horiz_off == NO_HORIZ_OFF)
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eff_horiz_off = 0;
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else
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eff_horiz_off = horiz_off;
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if (line == NULL)
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line = "";
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if (last_pos_highlighted)
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{
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clear_eol();
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last_pos_highlighted = 0;
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}
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column = 0;
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ent_ul = ent_bo = ACQUIESCE;
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for (p = line; *p != '\0'; p++)
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{
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/*
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* XXX line.c needs to be rewritten to store markup
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* information as metadata associated with each character.
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* This will make several things much nicer, fixing problems,
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* etc. Until then, this kludge will hold the fort well
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* enough.
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*/
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switch ((char)(c = (unsigned char)*p))
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{
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case UL_CHAR:
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ent_ul = ENTER;
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break;
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case UE_CHAR:
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if (ent_ul != ENTER)
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ent_ul = EXIT;
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else
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ent_ul = ACQUIESCE;
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break;
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case BO_CHAR:
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ent_bo = ENTER;
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break;
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case BE_CHAR:
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if (ent_bo != ENTER)
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ent_bo = EXIT;
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else
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ent_bo = ACQUIESCE;
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break;
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case '\t':
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do
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{
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MAYPUTCHR(' ');
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column++;
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} while ((column % tabstop) != 0);
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break;
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case '\b':
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/* markup() before putbs() ? */
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column += markup(&ent_ul, &ent_bo);
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putbs();
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column--;
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break;
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case '\r':
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/* treat \r\n sequences like \n if -u flag not set. */
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if (bs_mode || p[1] != '\0')
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{
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/* -u was set, or this CR is not a CRLF, so
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* treat this CR like any other control_char */
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MAYPUTCHR('^');
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column++;
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MAYPUTCHR(CARAT_CHAR(c));
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column++;
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}
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break;
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default:
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if (c == 0200 || CONTROL_CHAR(c))
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{
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c &= ~0200;
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MAYPUTCHR('^');
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column++;
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MAYPUTCHR(CARAT_CHAR(c));
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column++;
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} else
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{
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MAYPUTCHR(c);
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column++;
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}
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}
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if (column == sc_width + eff_horiz_off && mode_flags)
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last_pos_highlighted = 1;
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}
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column += markup(&ent_ul, &ent_bo);
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if (column < sc_width + eff_horiz_off || !auto_wrap || ignaw)
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putchr('\n');
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}
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static char obuf[2048]; /* just large enough for a full 25*80 screen */
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static char *ob = obuf;
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/*
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* Flush buffered output.
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*/
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flush()
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{
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register int n;
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n = ob - obuf;
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if (n == 0)
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return;
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if (write(1, obuf, n) != n)
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screen_trashed = 1;
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ob = obuf;
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}
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/*
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* Purge any pending output.
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*/
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purge()
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{
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ob = obuf;
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}
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/*
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* Output a character.
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*/
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putchr(c)
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int c;
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{
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if (ob >= &obuf[sizeof(obuf)])
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flush();
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*ob++ = c;
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}
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/*
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* Output a string.
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*/
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putstr(s)
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register char *s;
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{
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while (*s != '\0')
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putchr(*s++);
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}
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int cmdstack;
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static char return_to_continue[] = "(press RETURN)";
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/*
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* Output a message in the lower left corner of the screen
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* and wait for carriage return.
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*/
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error(s)
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char *s;
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{
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int ch;
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++errmsgs;
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if (!any_display) {
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/*
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* Nothing has been displayed yet. Output this message on
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* error output (file descriptor 2) and don't wait for a
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* keystroke to continue.
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*
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* This has the desirable effect of producing all error
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* messages on error output if standard output is directed
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* to a file. It also does the same if we never produce
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* any real output; for example, if the input file(s) cannot
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* be opened. If we do eventually produce output, code in
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* edit() makes sure these messages can be seen before they
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* are overwritten or scrolled away.
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*/
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(void)write(2, s, strlen(s));
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(void)write(2, "\n", 1);
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return;
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}
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lower_left();
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clear_eol();
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so_enter();
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if (s) {
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putstr(s);
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putstr(" ");
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}
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putstr(return_to_continue);
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so_exit();
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if ((ch = getchr()) != '\n') {
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/* XXX hardcoded */
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if (ch == 'q')
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quit();
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cmdstack = ch;
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}
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lower_left();
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if ((s==NULL)?0:(strlen(s)) + sizeof(return_to_continue) +
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so_width + se_width + 1 > sc_width)
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/*
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* Printing the message has probably scrolled the screen.
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* {{ Unless the terminal doesn't have auto margins,
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* in which case we just hammered on the right margin. }}
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*/
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repaint();
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flush();
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}
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static char intr_to_abort[] = "... (interrupt to abort)";
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ierror(s)
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char *s;
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{
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lower_left();
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clear_eol();
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so_enter();
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putstr(s);
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putstr(intr_to_abort);
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so_exit();
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flush();
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}
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