19e9205a23
install custom pager functions didn't actually happen in practice (they all just used the simple pager and passed in a local quit pointer). So, just hardcode the simple pager as the only pager and make it set a global db_pager_quit flag that db commands can check when the user hits 'q' (or a suitable variant) at the pager prompt. Also, now that it's easy to do so, enable paging by default for all ddb commands. Any command that wishes to honor the quit flag can do so by checking db_pager_quit. Note that the pager can also be effectively disabled by setting $lines to 0. Other fixes: - 'show idt' on i386 and pc98 now actually checks the quit flag and terminates early. - 'show intr' now actually checks the quit flag and terminates early.
312 lines
6.4 KiB
C
312 lines
6.4 KiB
C
/*-
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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/*
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* Printf and character output for debugger.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/cons.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <machine/stdarg.h>
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#include <ddb/ddb.h>
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#include <ddb/db_output.h>
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/*
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* Character output - tracks position in line.
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* To do this correctly, we should know how wide
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* the output device is - then we could zero
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* the line position when the output device wraps
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* around to the start of the next line.
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*
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* Instead, we count the number of spaces printed
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* since the last printing character so that we
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* don't print trailing spaces. This avoids most
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* of the wraparounds.
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*/
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static int db_output_position = 0; /* output column */
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static int db_last_non_space = 0; /* last non-space character */
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db_expr_t db_tab_stop_width = 8; /* how wide are tab stops? */
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#define NEXT_TAB(i) \
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((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width)
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db_expr_t db_max_width = 79; /* output line width */
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db_expr_t db_lines_per_page = 20; /* lines per page */
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volatile int db_pager_quit; /* user requested quit */
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static int db_newlines; /* # lines this page */
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static int db_maxlines; /* max lines/page when paging */
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static int ddb_use_printf = 0;
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SYSCTL_INT(_debug, OID_AUTO, ddb_use_printf, CTLFLAG_RW, &ddb_use_printf, 0,
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"use printf for all ddb output");
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static void db_putchar(int c, void *arg);
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static void db_pager(void);
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/*
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* Force pending whitespace.
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*/
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void
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db_force_whitespace()
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{
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register int last_print, next_tab;
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last_print = db_last_non_space;
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while (last_print < db_output_position) {
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next_tab = NEXT_TAB(last_print);
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if (next_tab <= db_output_position) {
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while (last_print < next_tab) { /* DON'T send a tab!!! */
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cnputc(' ');
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last_print++;
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}
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}
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else {
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cnputc(' ');
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last_print++;
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}
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}
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db_last_non_space = db_output_position;
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}
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/*
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* Output character. Buffer whitespace.
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*/
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static void
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db_putchar(c, arg)
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int c; /* character to output */
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void * arg;
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{
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/*
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* If not in the debugger or the user requests it, output data to
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* both the console and the message buffer.
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*/
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if (!kdb_active || ddb_use_printf) {
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printf("%c", c);
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if (!kdb_active)
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return;
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if (c == '\r' || c == '\n')
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db_check_interrupt();
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if (c == '\n' && db_maxlines > 0) {
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db_newlines++;
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if (db_newlines >= db_maxlines)
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db_pager();
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}
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return;
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}
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/* Otherwise, output data directly to the console. */
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if (c > ' ' && c <= '~') {
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/*
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* Printing character.
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* If we have spaces to print, print them first.
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* Use tabs if possible.
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*/
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db_force_whitespace();
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cnputc(c);
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db_output_position++;
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db_last_non_space = db_output_position;
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}
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else if (c == '\n') {
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/* Newline */
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db_force_whitespace();
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cnputc(c);
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db_output_position = 0;
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db_last_non_space = 0;
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db_check_interrupt();
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if (db_maxlines > 0) {
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db_newlines++;
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if (db_newlines >= db_maxlines)
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db_pager();
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}
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}
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else if (c == '\r') {
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/* Return */
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db_force_whitespace();
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cnputc(c);
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db_output_position = 0;
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db_last_non_space = 0;
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db_check_interrupt();
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}
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else if (c == '\t') {
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/* assume tabs every 8 positions */
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db_output_position = NEXT_TAB(db_output_position);
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}
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else if (c == ' ') {
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/* space */
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db_output_position++;
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}
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else if (c == '\007') {
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/* bell */
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cnputc(c);
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}
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/* other characters are assumed non-printing */
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}
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/*
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* Turn on the pager.
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*/
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void
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db_enable_pager(void)
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{
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if (db_maxlines == 0) {
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db_maxlines = db_lines_per_page;
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db_newlines = 0;
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db_pager_quit = 0;
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}
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}
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/*
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* Turn off the pager.
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*/
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void
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db_disable_pager(void)
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{
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db_maxlines = 0;
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}
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/*
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* A simple paging callout function. It supports several simple more(1)-like
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* commands as well as a quit command that sets db_pager_quit which db
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* commands can poll to see if they should terminate early.
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*/
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void
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db_pager(void)
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{
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int c, done;
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db_printf("--More--\r");
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done = 0;
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while (!done) {
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c = cngetc();
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switch (c) {
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case 'e':
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case 'j':
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case '\n':
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/* Just one more line. */
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db_maxlines = 1;
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done++;
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break;
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case 'd':
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/* Half a page. */
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db_maxlines = db_lines_per_page / 2;
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done++;
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break;
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case 'f':
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case ' ':
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/* Another page. */
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db_maxlines = db_lines_per_page;
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done++;
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break;
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case 'q':
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case 'Q':
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case 'x':
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case 'X':
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/* Quit */
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db_maxlines = 0;
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db_pager_quit = 1;
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done++;
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break;
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#if 0
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/* FALLTHROUGH */
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default:
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cnputc('\007');
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#endif
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}
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}
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db_printf(" \r");
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db_newlines = 0;
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}
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/*
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* Return output position
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*/
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int
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db_print_position()
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{
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return (db_output_position);
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}
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/*
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* Printing
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*/
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void
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#if __STDC__
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db_printf(const char *fmt, ...)
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#else
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db_printf(fmt)
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const char *fmt;
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#endif
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{
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va_list listp;
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va_start(listp, fmt);
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kvprintf (fmt, db_putchar, NULL, db_radix, listp);
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va_end(listp);
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}
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int db_indent;
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void
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#if __STDC__
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db_iprintf(const char *fmt,...)
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#else
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db_iprintf(fmt)
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const char *fmt;
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#endif
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{
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register int i;
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va_list listp;
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for (i = db_indent; i >= 8; i -= 8)
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db_printf("\t");
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while (--i >= 0)
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db_printf(" ");
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va_start(listp, fmt);
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kvprintf (fmt, db_putchar, NULL, db_radix, listp);
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va_end(listp);
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}
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/*
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* End line if too long.
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*/
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void
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db_end_line()
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{
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if (db_output_position >= db_max_width)
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db_printf("\n");
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}
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