output width of 79, only 6 columns of width 12 each fit, but 7 columns were printed. The fix is to pass the width of the next output to db_end_line() and not assume there that this width is always 1. Related unfixed bugs: - 1 character is wasted for a space after the last column - suppression of trailing spaces used to limit the misformatting, but seems to have been lost - in db_examine(), the width of the next output is not know and is still assumed to be 1.
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(int field_width)
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{
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if (db_output_position + field_width > db_max_width)
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db_printf("\n");
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}
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