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/*
* Copyright (c) 1988 Mark Nudleman
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)output.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
/*
* High level routines dealing with the output to the screen.
*/
#include <stdio.h>
#include <less.h>
int errmsgs; /* Count of messages displayed by error() */
extern int sigs;
extern int sc_width, sc_height;
extern int ul_width, ue_width;
extern int so_width, se_width;
extern int bo_width, be_width;
extern int tabstop;
extern int screen_trashed;
extern int any_display;
extern char *line;
/* display the line which is in the line buffer. */
put_line()
{
register char *p;
register int c;
register int column;
extern int auto_wrap, ignaw;
if (sigs)
{
/*
* Don't output if a signal is pending.
*/
screen_trashed = 1;
return;
}
if (line == NULL)
line = "";
column = 0;
for (p = line; *p != '\0'; p++)
{
switch (c = *p)
{
case UL_CHAR:
ul_enter();
column += ul_width +1;
break;
case UE_CHAR:
ul_exit();
column += ue_width;
break;
case BO_CHAR:
bo_enter();
column += bo_width +1;
break;
case BE_CHAR:
bo_exit();
column += be_width;
break;
case '\t':
do
{
putchr(' ');
column++;
} while ((column % tabstop) != 0);
break;
case '\b':
putbs();
column--;
break;
default:
if (c & 0200)
{
/*
* Control characters arrive here as the
* normal character [CARAT_CHAR(c)] with
* the 0200 bit set. See pappend().
*/
putchr('^');
putchr(c & 0177);
column += 2;
} else
{
putchr(c);
column++;
}
}
}
if (column < sc_width || !auto_wrap || ignaw)
putchr('\n');
}
static char obuf[1024];
static char *ob = obuf;
/*
* Flush buffered output.
*/
flush()
{
register int n;
n = ob - obuf;
if (n == 0)
return;
if (write(1, obuf, n) != n)
screen_trashed = 1;
ob = obuf;
}
/*
* Purge any pending output.
*/
purge()
{
ob = obuf;
}
/*
* Output a character.
*/
putchr(c)
int c;
{
if (ob >= &obuf[sizeof(obuf)])
flush();
*ob++ = c;
}
/*
* Output a string.
*/
putstr(s)
register char *s;
{
while (*s != '\0')
putchr(*s++);
}
int cmdstack;
static char return_to_continue[] = "(press RETURN)";
/*
* Output a message in the lower left corner of the screen
* and wait for carriage return.
*/
error(s)
char *s;
{
int ch;
++errmsgs;
if (!any_display) {
/*
* Nothing has been displayed yet. Output this message on
* error output (file descriptor 2) and don't wait for a
* keystroke to continue.
*
* This has the desirable effect of producing all error
* messages on error output if standard output is directed
* to a file. It also does the same if we never produce
* any real output; for example, if the input file(s) cannot
* be opened. If we do eventually produce output, code in
* edit() makes sure these messages can be seen before they
* are overwritten or scrolled away.
*/
(void)write(2, s, strlen(s));
(void)write(2, "\n", 1);
return;
}
lower_left();
clear_eol();
so_enter();
if (s) {
putstr(s);
putstr(" ");
}
putstr(return_to_continue);
so_exit();
if ((ch = getchr()) != '\n') {
if (ch == 'q')
quit();
cmdstack = ch;
}
lower_left();
if (strlen(s) + sizeof(return_to_continue) +
so_width + se_width + 1 > sc_width)
/*
* Printing the message has probably scrolled the screen.
* {{ Unless the terminal doesn't have auto margins,
* in which case we just hammered on the right margin. }}
*/
repaint();
flush();
}
static char intr_to_abort[] = "... (interrupt to abort)";
ierror(s)
char *s;
{
lower_left();
clear_eol();
so_enter();
putstr(s);
putstr(intr_to_abort);
so_exit();
flush();
}
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