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output.c
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C/C++ Source or Header
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1996-09-28
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8KB
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411 lines
/*
* Copyright (c) 1984,1985,1989,1994,1995,1996 Mark Nudelman
* 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 in the documentation and/or other materials provided with
* the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* High level routines dealing with the output to the screen.
*/
#include "less.h"
#if MSDOS_COMPILER==WIN32C
#include "windows.h"
#endif
public int errmsgs; /* Count of messages displayed by error() */
public int need_clr;
extern int sigs;
extern int sc_width;
extern int so_s_width, so_e_width;
extern int screen_trashed;
extern int any_display;
extern int is_tty;
/*
* Display the line which is in the line buffer.
*/
public void
put_line()
{
register int c;
register int i;
int a;
int curr_attr;
if (ABORT_SIGS())
{
/*
* Don't output if a signal is pending.
*/
screen_trashed = 1;
return;
}
curr_attr = AT_NORMAL;
for (i = 0; (c = gline(i, &a)) != '\0'; i++)
{
if (a != curr_attr)
{
/*
* Changing attributes.
* Display the exit sequence for the old attribute
* and the enter sequence for the new one.
*/
switch (curr_attr)
{
case AT_UNDERLINE: ul_exit(); break;
case AT_BOLD: bo_exit(); break;
case AT_BLINK: bl_exit(); break;
case AT_STANDOUT: so_exit(); break;
}
switch (a)
{
case AT_UNDERLINE: ul_enter(); break;
case AT_BOLD: bo_enter(); break;
case AT_BLINK: bl_enter(); break;
case AT_STANDOUT: so_enter(); break;
}
curr_attr = a;
}
if (curr_attr == AT_INVIS)
continue;
if (c == '\b')
putbs();
else
putchr(c);
}
switch (curr_attr)
{
case AT_UNDERLINE: ul_exit(); break;
case AT_BOLD: bo_exit(); break;
case AT_BLINK: bl_exit(); break;
case AT_STANDOUT: so_exit(); break;
}
}
static char obuf[OUTBUF_SIZE];
static char *ob = obuf;
/*
* Flush buffered output.
*
* If we haven't displayed any file data yet,
* output messages on error output (file descriptor 2),
* otherwise output on standard output (file descriptor 1).
*
* 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.
*/
public void
flush()
{
register int n;
register int fd;
#if MSDOS_COMPILER==WIN32C
if (is_tty && any_display)
{
DWORD nwritten = 0;
extern HANDLE con_out;
*ob = '\0';
WriteConsole(con_out, obuf, strlen(obuf), &nwritten, NULL);
ob = obuf;
return;
}
#else
#if MSDOS_COMPILER==MSOFTC
if (is_tty && any_display)
{
*ob = '\0';
_outtext(obuf);
ob = obuf;
return;
}
#else
#if MSDOS_COMPILER==BORLANDC
if (is_tty && any_display)
{
*ob = '\0';
cputs(obuf);
ob = obuf;
return;
}
#endif
#endif
#endif
n = ob - obuf;
if (n == 0)
return;
fd = (any_display) ? 1 : 2;
if (write(fd, obuf, n) != n)
screen_trashed = 1;
ob = obuf;
}
/*
* Output a character.
*/
public int
putchr(c)
int c;
{
if (ob >= &obuf[sizeof(obuf)])
flush();
if (need_clr)
{
need_clr = 0;
clear_bot();
}
#if MSDOS_COMPILER
if (c == '\n' && is_tty)
putchr('\r');
#else
#ifdef _OSK
if (c == '\n' && is_tty) /* In OS-9, '\n' == 0x0D */
putchr(0x0A);
#endif
#endif
*ob++ = c;
return (c);
}
/*
* Output a string.
*/
public void
putstr(s)
register char *s;
{
while (*s != '\0')
putchr(*s++);
}
/*
* Output an integer in a given radix.
*/
static int
iprintnum(num, radix)
int num;
int radix;
{
register char *s;
int r;
int neg;
char buf[10];
neg = (num < 0);
if (neg)
num = -num;
s = buf;
do
{
*s++ = (num % radix) + '0';
} while ((num /= radix) != 0);
if (neg)
*s++ = '-';
r = s - buf;
while (s > buf)
putchr(*--s);
return (r);
}
/*
* This function implements printf-like functionality
* using a more portable argument list mechanism than printf's.
*/
static int
iprintf(fmt, parg)
register char *fmt;
PARG *parg;
{
register char *s;
register int n;
register int col;
col = 0;
while (*fmt != '\0')
{
if (*fmt != '%')
{
putchr(*fmt++);
col++;
} else
{
++fmt;
switch (*fmt++) {
case 's':
s = parg->p_string;
parg++;
while (*s != '\0')
{
putchr(*s++);
col++;
}
break;
case 'd':
n = parg->p_int;
parg++;
col += iprintnum(n, 10);
break;
}
}
}
return (col);
}
/*
* Get a RETURN.
* If some other non-trivial char is pressed, unget it, so it will
* become the next command.
*/
public void
get_return()
{
int c;
#if ONLY_RETURN
while ((c = getchr()) != '\n' && c != '\r')
bell();
#else
c = getchr();
if (c != '\n' && c != '\r' && c != ' ' && c != READ_INTR)
ungetcc(c);
#endif
}
/*
* Output a message in the lower left corner of the screen
* and wait for carriage return.
*/
public void
error(fmt, parg)
char *fmt;
PARG *parg;
{
int col = 0;
static char return_to_continue[] = " (press RETURN)";
errmsgs++;
if (any_display)
{
clear_bot();
so_enter();
col += so_s_width;
}
col += iprintf(fmt, parg);
if (!any_display)
{
putchr('\n');
return;
}
putstr(return_to_continue);
so_exit();
col += sizeof(return_to_continue) + so_e_width;
get_return();
lower_left();
if (col >= 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. }}
*/
screen_trashed = 1;
flush();
}
static char intr_to_abort[] = "... (interrupt to abort)";
/*
* Output a message in the lower left corner of the screen
* and don't wait for carriage return.
* Usually used to warn that we are beginning a potentially
* time-consuming operation.
*/
public void
ierror(fmt, parg)
char *fmt;
PARG *parg;
{
clear_bot();
so_enter();
(void) iprintf(fmt, parg);
putstr(intr_to_abort);
so_exit();
flush();
need_clr = 1;
}
/*
* Output a message in the lower left corner of the screen
* and return a single-character response.
*/
public int
query(fmt, parg)
char *fmt;
PARG *parg;
{
register int c;
int col = 0;
if (any_display)
clear_bot();
(void) iprintf(fmt, parg);
c = getchr();
if (!any_display)
{
putchr('\n');
return (c);
}
lower_left();
if (col >= sc_width)
screen_trashed = 1;
flush();
return (c);
}