321 lines
6.9 KiB
C
321 lines
6.9 KiB
C
/*
|
|
* 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 */
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* High level routines dealing with the output to the screen.
|
|
*/
|
|
|
|
#include <ctype.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "less.h"
|
|
|
|
extern int bs_mode;
|
|
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 char *line;
|
|
extern int horiz_off;
|
|
extern int mode_flags;
|
|
|
|
static int last_pos_highlighted = 0;
|
|
|
|
/* static markup()
|
|
*
|
|
* Output correct markup char; return number of columns eaten-up.
|
|
* Called by put_line() just before doing any actual output.
|
|
*/
|
|
#define ENTER 1
|
|
#define ACQUIESCE 0 /* XXX Check actual def'n... */
|
|
#define EXIT -1
|
|
|
|
static
|
|
markup(ent_ul, ent_bo)
|
|
int *ent_ul, *ent_bo;
|
|
{
|
|
int retr;
|
|
|
|
retr = 0;
|
|
switch (*ent_ul) {
|
|
case ENTER:
|
|
ul_enter();
|
|
retr += ul_width;
|
|
break;
|
|
case EXIT:
|
|
ul_exit();
|
|
retr += ue_width;
|
|
break;
|
|
}
|
|
switch (*ent_bo) {
|
|
case ENTER:
|
|
bo_enter();
|
|
retr += bo_width;
|
|
break;
|
|
case EXIT:
|
|
bo_exit();
|
|
retr += be_width;
|
|
break;
|
|
}
|
|
*ent_ul = *ent_bo = ACQUIESCE;
|
|
return retr;
|
|
}
|
|
|
|
/* put_line()
|
|
*
|
|
* Display the line which is in the line buffer. The number of output
|
|
* characters in the line buffer cannot exceed screen columns available.
|
|
* Output characters in the line buffer that precede horiz_off are skipped.
|
|
* The caller may depend on this behaviour to ensure that the number of output
|
|
* characters in the line buffer does not exceed the screen columns
|
|
* available.
|
|
*
|
|
* This routine will get confused if the line buffer has non-sensical
|
|
* UL_CHAR, UE_CHAR, BO_CHAR, BE_CHAR markups.
|
|
*/
|
|
#define MAYPUTCHR(char) \
|
|
if (column >= horiz_off) { \
|
|
column += markup(&ent_ul, &ent_bo); \
|
|
putchr(char); \
|
|
}
|
|
|
|
put_line()
|
|
{
|
|
register char *p;
|
|
register int c;
|
|
register int column;
|
|
extern int auto_wrap, ignaw;
|
|
int ent_ul, ent_bo; /* enter or exit ul|bo mode for next char */
|
|
|
|
if (sigs)
|
|
{
|
|
/*
|
|
* Don't output if a signal is pending.
|
|
*/
|
|
screen_trashed = 1;
|
|
return;
|
|
}
|
|
|
|
if (line == NULL)
|
|
line = "";
|
|
|
|
if (last_pos_highlighted)
|
|
{
|
|
clear_eol();
|
|
last_pos_highlighted = 0;
|
|
}
|
|
column = 0;
|
|
ent_ul = ent_bo = ACQUIESCE;
|
|
for (p = line; *p != '\0'; p++)
|
|
{
|
|
/*
|
|
* XXX line.c needs to be rewritten to store markup
|
|
* information as metadata associated with each character.
|
|
* This will make several things much nicer, fixing problems,
|
|
* etc. Until then, this kludge will hold the fort well
|
|
* enough.
|
|
*/
|
|
switch ((char)(c = (unsigned char)*p))
|
|
{
|
|
case UL_CHAR:
|
|
ent_ul = ENTER;
|
|
break;
|
|
case UE_CHAR:
|
|
if (ent_ul != ENTER)
|
|
ent_ul = EXIT;
|
|
else
|
|
ent_ul = ACQUIESCE;
|
|
break;
|
|
case BO_CHAR:
|
|
ent_bo = ENTER;
|
|
break;
|
|
case BE_CHAR:
|
|
if (ent_bo != ENTER)
|
|
ent_bo = EXIT;
|
|
else
|
|
ent_bo = ACQUIESCE;
|
|
break;
|
|
case '\t':
|
|
do
|
|
{
|
|
MAYPUTCHR(' ');
|
|
column++;
|
|
} while ((column % tabstop) != 0);
|
|
break;
|
|
case '\b':
|
|
/*
|
|
* column must be at least one greater than
|
|
* horiz_off (ie. we must be in the second or
|
|
* beyond screen column) or we'll just end-up
|
|
* backspacing up to the previous line.
|
|
*/
|
|
if (column > horiz_off) {
|
|
column += markup(&ent_ul, &ent_bo);
|
|
putbs();
|
|
column--;
|
|
}
|
|
break;
|
|
case '\r':
|
|
/* treat \r\n sequences like \n if -u flag not set. */
|
|
if (bs_mode || p[1] != '\0')
|
|
{
|
|
/* -u was set, or this CR is not a CRLF, so
|
|
* treat this CR like any other control_char */
|
|
MAYPUTCHR('^');
|
|
column++;
|
|
MAYPUTCHR(CARAT_CHAR(c));
|
|
column++;
|
|
}
|
|
break;
|
|
default:
|
|
if (c == 0200 || CONTROL_CHAR(c))
|
|
{
|
|
c &= ~0200;
|
|
MAYPUTCHR('^');
|
|
column++;
|
|
MAYPUTCHR(CARAT_CHAR(c));
|
|
column++;
|
|
} else
|
|
{
|
|
MAYPUTCHR(c);
|
|
column++;
|
|
}
|
|
}
|
|
if (column == sc_width + horiz_off && mode_flags)
|
|
last_pos_highlighted = 1;
|
|
}
|
|
column += markup(&ent_ul, &ent_bo);
|
|
if (column < sc_width + horiz_off || !auto_wrap || ignaw)
|
|
putchr('\n');
|
|
}
|
|
|
|
static char obuf[2048]; /* just large enough for a full 25*80 screen */
|
|
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++);
|
|
}
|
|
|
|
/*
|
|
* Output a string, expanding control characters into printable sequences.
|
|
* Returns the number of characters printed.
|
|
*/
|
|
int
|
|
putxstr(s)
|
|
char *s;
|
|
{
|
|
int c;
|
|
int retr = 0;
|
|
|
|
for (; c = *s; s++) {
|
|
if (CONTROL_CHAR(c)) {
|
|
putchr('^');
|
|
retr++;
|
|
c &= ~0200;
|
|
c = CARAT_CHAR(c);
|
|
}
|
|
putchr(c);
|
|
}
|
|
|
|
return(retr);
|
|
}
|
|
|
|
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();
|
|
}
|