2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
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7 * documentation is hereby granted, provided that both the copyright
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19 * School of Computer Science
20 * Carnegie Mellon University
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23 * any improvements or extensions that they make and grant Carnegie the
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26 * $FreeBSD: src/sys/ddb/db_output.c,v 1.26 1999/08/28 00:41:09 peter Exp $
27 * $DragonFly: src/sys/ddb/db_output.c,v 1.9 2008/09/25 13:30:15 sephe Exp $
31 * Author: David B. Golub, Carnegie Mellon University
36 * Printf and character output for debugger.
39 #include <sys/param.h>
40 #include <sys/systm.h>
42 #include <sys/thread2.h>
43 #include <sys/spinlock2.h>
45 #include <machine/stdarg.h>
48 #include <ddb/db_output.h>
51 * Character output - tracks position in line.
52 * To do this correctly, we should know how wide
53 * the output device is - then we could zero
54 * the line position when the output device wraps
55 * around to the start of the next line.
57 * Instead, we count the number of spaces printed
58 * since the last printing character so that we
59 * don't print trailing spaces. This avoids most
62 static int db_output_position = 0; /* output column */
63 static int db_last_non_space = 0; /* last non-space character */
64 db_expr_t db_tab_stop_width = 8; /* how wide are tab stops? */
66 ((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width)
67 db_expr_t db_max_width = 79; /* output line width */
69 static void db_putchar (int c, void *arg);
72 * Force pending whitespace.
75 db_force_whitespace(void)
77 int last_print, next_tab;
79 last_print = db_last_non_space;
80 while (last_print < db_output_position) {
81 next_tab = NEXT_TAB(last_print);
82 if (next_tab <= db_output_position) {
83 while (last_print < next_tab) { /* DON'T send a tab!!! */
93 db_last_non_space = db_output_position;
97 * Output character. Buffer whitespace.
100 * arg: character to output
103 db_putchar(int c, void *arg)
106 * If not in the debugger, output data to both the console and
107 * the message buffer.
113 if (c == '\r' || c == '\n')
114 db_check_interrupt();
120 if (c > ' ' && c <= '~') {
122 * Printing character.
123 * If we have spaces to print, print them first.
124 * Use tabs if possible.
126 db_force_whitespace();
128 db_output_position++;
129 db_last_non_space = db_output_position;
131 else if (c == '\n') {
134 db_output_position = 0;
135 db_last_non_space = 0;
136 db_check_interrupt();
138 else if (c == '\r') {
141 db_output_position = 0;
142 db_last_non_space = 0;
143 db_check_interrupt();
145 else if (c == '\t') {
146 /* assume tabs every 8 positions */
147 db_output_position = NEXT_TAB(db_output_position);
151 db_output_position++;
153 else if (c == '\007') {
157 /* other characters are assumed non-printing */
162 * Return output position
165 db_print_position(void)
167 return (db_output_position);
173 * NOTE: We bypass subr_prf's cons_spin here by using our own putchar
177 db_printf(const char *fmt, ...)
181 __va_start(listp, fmt);
182 kvcprintf (fmt, db_putchar, NULL, db_radix, listp);
187 db_vprintf(const char *fmt, __va_list va)
189 kvcprintf (fmt, db_putchar, NULL, db_radix, va);
195 db_iprintf(const char *fmt,...)
200 for (i = db_indent; i >= 8; i -= 8)
204 __va_start(listp, fmt);
205 kvcprintf (fmt, db_putchar, NULL, db_radix, listp);
210 * End line if too long.
215 if (db_output_position >= db_max_width)
229 db_printf("--More--");
233 * A whole screenfull or just one line?
236 case '\n': /* just one line */
240 *nl = 0; /* another screenfull */