2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
16 * Carnegie Mellon requests users of this software to return to
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
27 * Author: David B. Golub, Carnegie Mellon University
32 * Printf and character output for debugger.
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/sysctl.h>
47 #include <machine/stdarg.h>
50 #include <ddb/db_output.h>
52 struct dbputchar_arg {
60 * Character output - tracks position in line.
61 * To do this correctly, we should know how wide
62 * the output device is - then we could zero
63 * the line position when the output device wraps
64 * around to the start of the next line.
66 * Instead, we count the number of spaces printed
67 * since the last printing character so that we
68 * don't print trailing spaces. This avoids most
71 static int db_output_position = 0; /* output column */
72 static int db_last_non_space = 0; /* last non-space character */
73 db_expr_t db_tab_stop_width = 8; /* how wide are tab stops? */
74 #define NEXT_TAB(i) rounddown((i) + db_tab_stop_width, db_tab_stop_width)
75 db_expr_t db_max_width = 79; /* output line width */
76 db_expr_t db_lines_per_page = 20; /* lines per page */
77 volatile int db_pager_quit; /* user requested quit */
78 static int db_newlines; /* # lines this page */
79 static int db_maxlines; /* max lines/page when paging */
80 static int ddb_use_printf = 0;
81 SYSCTL_INT(_debug, OID_AUTO, ddb_use_printf, CTLFLAG_RW, &ddb_use_printf, 0,
82 "use printf for all ddb output");
84 static void db_putc(int c);
85 static void db_puts(const char *str);
86 static void db_putchar(int c, void *arg);
87 static void db_pager(void);
90 * Force pending whitespace.
93 db_force_whitespace(void)
95 int last_print, next_tab;
97 last_print = db_last_non_space;
98 while (last_print < db_output_position) {
99 next_tab = NEXT_TAB(last_print);
100 if (next_tab <= db_output_position) {
101 while (last_print < next_tab) { /* DON'T send a tab!!! */
103 db_capture_writech(' ');
109 db_capture_writech(' ');
113 db_last_non_space = db_output_position;
117 * Output character. Buffer whitespace.
120 db_putchar(int c, void *arg)
122 struct dbputchar_arg *dap = arg;
124 if (dap->da_pbufr == NULL) {
126 /* No bufferized output is provided. */
130 *dap->da_pnext++ = c;
133 /* Leave always the buffer 0 terminated. */
134 *dap->da_pnext = '\0';
136 /* Check if the buffer needs to be flushed. */
137 if (dap->da_remain < 2 || c == '\n') {
138 db_puts(dap->da_pbufr);
139 dap->da_pnext = dap->da_pbufr;
140 dap->da_remain = dap->da_nbufr;
141 *dap->da_pnext = '\0';
151 * If not in the debugger or the user requests it, output data to
152 * both the console and the message buffer.
154 if (!kdb_active || ddb_use_printf) {
158 if (c == '\r' || c == '\n')
159 db_check_interrupt();
160 if (c == '\n' && db_maxlines > 0) {
162 if (db_newlines >= db_maxlines)
168 /* Otherwise, output data directly to the console. */
169 if (c > ' ' && c <= '~') {
171 * Printing character.
172 * If we have spaces to print, print them first.
173 * Use tabs if possible.
175 db_force_whitespace();
177 db_capture_writech(c);
178 db_output_position++;
179 db_last_non_space = db_output_position;
181 else if (c == '\n') {
184 db_capture_writech(c);
185 db_output_position = 0;
186 db_last_non_space = 0;
187 db_check_interrupt();
188 if (db_maxlines > 0) {
190 if (db_newlines >= db_maxlines)
194 else if (c == '\r') {
197 db_capture_writech(c);
198 db_output_position = 0;
199 db_last_non_space = 0;
200 db_check_interrupt();
202 else if (c == '\t') {
203 /* assume tabs every 8 positions */
204 db_output_position = NEXT_TAB(db_output_position);
208 db_output_position++;
210 else if (c == '\007') {
213 /* No need to beep in a log: db_capture_writech(c); */
215 /* other characters are assumed non-printing */
219 db_puts(const char *str)
223 for (i = 0; str[i] != '\0'; i++)
231 db_enable_pager(void)
233 if (db_maxlines == 0) {
234 db_maxlines = db_lines_per_page;
241 * Turn off the pager.
244 db_disable_pager(void)
250 * A simple paging callout function. It supports several simple more(1)-like
251 * commands as well as a quit command that sets db_pager_quit which db
252 * commands can poll to see if they should terminate early.
259 db_capture_enterpager();
260 db_printf("--More--\r");
268 /* Just one more line. */
274 db_maxlines = db_lines_per_page / 2;
280 db_maxlines = db_lines_per_page;
300 db_force_whitespace();
303 db_capture_exitpager();
307 * Return output position
310 db_print_position(void)
312 return (db_output_position);
319 db_printf(const char *fmt, ...)
322 char bufr[DDB_BUFR_SIZE];
324 struct dbputchar_arg dca;
330 dca.da_pnext = dca.da_pbufr;
331 dca.da_nbufr = sizeof(bufr);
332 dca.da_remain = sizeof(bufr);
333 *dca.da_pnext = '\0';
338 va_start(listp, fmt);
339 retval = kvprintf (fmt, db_putchar, &dca, db_radix, listp);
343 if (*dca.da_pbufr != '\0')
344 db_puts(dca.da_pbufr);
352 db_iprintf(const char *fmt,...)
355 char bufr[DDB_BUFR_SIZE];
357 struct dbputchar_arg dca;
361 for (i = db_indent; i >= 8; i -= 8)
368 dca.da_pnext = dca.da_pbufr;
369 dca.da_nbufr = sizeof(bufr);
370 dca.da_remain = sizeof(bufr);
371 *dca.da_pnext = '\0';
376 va_start(listp, fmt);
377 kvprintf (fmt, db_putchar, &dca, db_radix, listp);
381 if (*dca.da_pbufr != '\0')
382 db_puts(dca.da_pbufr);
387 * End line if too long.
390 db_end_line(int field_width)
392 if (db_output_position + field_width > db_max_width)