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/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
#if MACH_KDB
/*
* Printf and character output for debugger.
*/
#include <kern/printf.h>
#include <stdarg.h>
#include <mach/boolean.h>
#include <machine/db_machdep.h>
#include <device/cons.h>
#include <ddb/db_command.h>
#include <ddb/db_lex.h>
#include <ddb/db_output.h>
#include <ddb/db_input.h>
/*
* Character output - tracks position in line.
* To do this correctly, we should know how wide
* the output device is - then we could zero
* the line position when the output device wraps
* around to the start of the next line.
*
* Instead, we count the number of spaces printed
* since the last printing character so that we
* don't print trailing spaces. This avoids most
* of the wraparounds.
*/
#ifndef DB_MAX_LINE
#define DB_MAX_LINE 24 /* maximum line */
#define DB_MAX_WIDTH 80 /* maximum width */
#endif /* DB_MAX_LINE */
#define DB_MIN_MAX_WIDTH 20 /* minimum max width */
#define DB_MIN_MAX_LINE 3 /* minimum max line */
#define CTRL(c) ((c) & 0xff)
int db_output_position = 0; /* output column */
int db_output_line = 0; /* output line number */
int db_last_non_space = 0; /* last non-space character */
int db_tab_stop_width = 8; /* how wide are tab stops? */
#define NEXT_TAB(i) \
((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width)
int db_max_line = DB_MAX_LINE; /* output max lines */
int db_max_width = DB_MAX_WIDTH; /* output line width */
/*
* Force pending whitespace.
*/
void
db_force_whitespace(void)
{
int last_print, next_tab;
last_print = db_last_non_space;
while (last_print < db_output_position) {
next_tab = NEXT_TAB(last_print);
if (next_tab <= db_output_position) {
cnputc('\t');
last_print = next_tab;
}
else {
cnputc(' ');
last_print++;
}
}
db_last_non_space = db_output_position;
}
static void
db_more(void)
{
char *p;
boolean_t quit_output = FALSE;
for (p = "--db_more--"; *p; p++)
cnputc(*p);
switch(cngetc()) {
case ' ':
db_output_line = 0;
break;
case 'q':
case CTRL('c'):
db_output_line = 0;
quit_output = TRUE;
break;
default:
db_output_line--;
break;
}
p = "\b\b\b\b\b\b\b\b\b\b\b \b\b\b\b\b\b\b\b\b\b\b";
while (*p)
cnputc(*p++);
if (quit_output) {
db_error(0);
/* NOTREACHED */
}
}
/*
* Output character. Buffer whitespace.
*/
void
db_putchar(int c) /* character to output */
{
if (db_max_line >= DB_MIN_MAX_LINE && db_output_line >= db_max_line-1)
db_more();
if (c > ' ' && c <= '~') {
/*
* Printing character.
* If we have spaces to print, print them first.
* Use tabs if possible.
*/
db_force_whitespace();
cnputc(c);
db_output_position++;
if (db_max_width >= DB_MIN_MAX_WIDTH
&& db_output_position >= db_max_width) {
/* auto new line */
cnputc('\n');
db_output_position = 0;
db_last_non_space = 0;
db_output_line++;
}
db_last_non_space = db_output_position;
}
else if (c == '\n') {
/* Return */
cnputc(c);
db_output_position = 0;
db_last_non_space = 0;
db_output_line++;
db_check_interrupt();
}
else if (c == '\t') {
/* assume tabs every 8 positions */
db_output_position = NEXT_TAB(db_output_position);
}
else if (c == ' ') {
/* space */
db_output_position++;
}
else if (c == '\007') {
/* bell */
cnputc(c);
}
/* other characters are assumed non-printing */
}
void
db_id_putc(char c, vm_offset_t dummy)
{
db_putchar(c);
}
/*
* Return output position
*/
int __attribute__ ((pure))
db_print_position(void)
{
return (db_output_position);
}
/*
* End line if too long.
*/
void db_end_line(void)
{
if (db_output_position >= db_max_width-1)
db_printf("\n");
}
/*VARARGS1*/
void
db_printf(const char *fmt, ...)
{
va_list listp;
va_start(listp, fmt);
_doprnt(fmt, listp, db_id_putc, db_radix, 0);
va_end(listp);
}
#endif /* MACH_KDB */
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