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Almathera Ten Pack 2: CDPD 1
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Almathera Ten on Ten - Disc 2: CDPD 1.iso
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pd
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051-075
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074
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less
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output.c
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C/C++ Source or Header
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1995-03-13
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3KB
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206 lines
/*
* High level routines dealing with the output to the screen.
*/
#include "less.h"
extern int sigs;
extern int sc_width, sc_height;
extern int ul_width, ue_width;
extern int so_width, se_width;
extern int tabstop;
extern int twiddle;
extern char *line;
extern char *first_cmd;
/*
* Display the line which is in the line buffer.
*/
public void
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.
*/
return;
if (line == NULL)
line = (twiddle) ? "~" : "";
column = 0;
for (p = line; *p != '\0'; p++)
{
switch (c = *p)
{
case UL_CHAR:
ul_enter();
column += ul_width;
break;
case UE_CHAR:
ul_exit();
column += ue_width;
break;
case '\t':
do
{
putc(' ');
column++;
} while ((column % tabstop) != 0);
break;
case '\b':
putbs();
column--;
break;
default:
if (c & 0200)
{
putc('^');
putc(c & 0177);
column += 2;
} else
{
putc(c);
column++;
}
}
}
if (column < sc_width || !auto_wrap || ignaw)
putc('\n');
}
/*
* Is a given character a "control" character?
* {{ ASCII DEPENDENT }}
*/
public int
control_char(c)
int c;
{
return (c < ' ' || c == '\177');
}
/*
* Return the printable character used to identify a control character
* (printed after a carat; e.g. '\3' => "^C").
* {{ ASCII DEPENDENT }}
*/
public int
carat_char(c)
int c;
{
return ((c == '\177') ? '?' : (c | 0100));
}
static char obuf[1024];
static char *ob = obuf;
/*
* Flush buffered output.
*/
public void
flush()
{
#ifdef amiga
extern struct FileHandle *tty;
extern nrow;
if (nrow == 0)
ttopen();
ttflush();
Write(tty, obuf, (long) ob-obuf);
#else
write(1, obuf, ob-obuf);
#endif
ob = obuf;
}
/*
* Discard buffered output.
*/
public void
dropout()
{
ob = obuf;
}
/*
* Output a character.
*/
public void
putc(c)
int c;
{
if (ob >= &obuf[sizeof(obuf)])
flush();
*ob++ = c;
}
/*
* Output a string.
*/
public void
puts(s)
register char *s;
{
while (*s != '\0')
putc(*s++);
}
/*
* Output a message in the lower left corner of the screen
* and wait for carriage return.
*/
static char return_to_continue[] = " (press RETURN)";
public void
error(s)
char *s;
{
register int c;
static char buf[2];
lower_left();
clear_eol();
so_enter();
puts(s);
puts(return_to_continue);
so_exit();
#if ONLY_RETURN
while ((c = getc()) != '\n' && c != '\r')
bell();
#else
c = getc();
if (c != '\n' && c != '\r' && c != ' ')
{
buf[0] = c;
first_cmd = buf;
}
#endif
if (strlen(s) > sc_width)
repaint();
}
public int
error_width()
{
/*
* Don't use the last position, because some terminals
* will scroll if you write in the last char of the last line.
*/
return (sc_width -
(sizeof(return_to_continue) + so_width + se_width + 1));
}