370 lines
7.6 KiB
C
370 lines
7.6 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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* $Id: db_output.c,v 1.4 1993/10/16 16:47:20 rgrimes Exp $
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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 "param.h"
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#include "systm.h"
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#include <machine/stdarg.h>
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#include "ddb/ddb.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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int db_output_position = 0; /* output column */
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int db_last_non_space = 0; /* last non-space character */
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int 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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int db_max_width = 80; /* output line width */
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static void db_printf_guts(const char *, va_list);
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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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void
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db_putchar(c)
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int c; /* character to output */
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{
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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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/* Return */
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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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* 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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db_printf(const char *fmt, ...)
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{
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va_list listp;
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va_start(listp, fmt);
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db_printf_guts (fmt, listp);
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va_end(listp);
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}
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/* alternate name */
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/*VARARGS1*/
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void
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kdbprintf(char *fmt, ...)
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{
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va_list listp;
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va_start(listp, fmt);
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db_printf_guts (fmt, 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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/*
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* Put a number (base <= 16) in a buffer in reverse order; return an
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* optional length and a pointer to the NULL terminated (preceded?)
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* buffer.
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*/
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static char *
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db_ksprintn(ul, base, lenp)
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register u_long ul;
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register int base, *lenp;
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{ /* A long in base 8, plus NULL. */
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static char buf[sizeof(long) * NBBY / 3 + 2];
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register char *p;
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p = buf;
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do {
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*++p = "0123456789abcdef"[ul % base];
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} while (ul /= base);
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if (lenp)
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*lenp = p - buf;
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return (p);
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}
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static void
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db_printf_guts(fmt, ap)
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register const char *fmt;
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va_list ap;
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{
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register char *p;
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register int ch, n;
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u_long ul;
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int base, lflag, tmp, width;
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char padc;
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int ladjust;
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int sharpflag;
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int neg;
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for (;;) {
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padc = ' ';
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width = 0;
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while ((ch = *(u_char *)fmt++) != '%') {
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if (ch == '\0')
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return;
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db_putchar(ch);
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}
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lflag = 0;
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ladjust = 0;
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sharpflag = 0;
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neg = 0;
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reswitch: switch (ch = *(u_char *)fmt++) {
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case '0':
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padc = '0';
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goto reswitch;
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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for (width = 0;; ++fmt) {
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width = width * 10 + ch - '0';
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ch = *fmt;
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if (ch < '0' || ch > '9')
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break;
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}
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goto reswitch;
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case 'l':
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lflag = 1;
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goto reswitch;
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case '-':
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ladjust = 1;
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goto reswitch;
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case '#':
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sharpflag = 1;
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goto reswitch;
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case 'b':
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ul = va_arg(ap, int);
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p = va_arg(ap, char *);
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for (p = db_ksprintn(ul, *p++, NULL); ch = *p--;)
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db_putchar(ch);
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if (!ul)
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break;
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for (tmp = 0; n = *p++;) {
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if (ul & (1 << (n - 1))) {
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db_putchar(tmp ? ',' : '<');
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for (; (n = *p) > ' '; ++p)
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db_putchar(n);
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tmp = 1;
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} else
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for (; *p > ' '; ++p);
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}
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if (tmp)
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db_putchar('>');
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break;
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case '*':
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width = va_arg (ap, int);
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if (width < 0) {
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ladjust = !ladjust;
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width = -width;
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}
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goto reswitch;
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case 'c':
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db_putchar(va_arg(ap, int));
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break;
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case 's':
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p = va_arg(ap, char *);
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width -= strlen (p);
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if (!ladjust && width > 0)
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while (width--)
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db_putchar (padc);
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while (ch = *p++)
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db_putchar(ch);
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if (ladjust && width > 0)
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while (width--)
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db_putchar (padc);
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break;
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case 'r':
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ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
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if ((long)ul < 0) {
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neg = 1;
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ul = -(long)ul;
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}
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base = db_radix;
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if (base < 8 || base > 16)
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base = 10;
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goto number;
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case 'n':
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ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
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base = db_radix;
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if (base < 8 || base > 16)
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base = 10;
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goto number;
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case 'd':
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ul = lflag ? va_arg(ap, long) : va_arg(ap, int);
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if ((long)ul < 0) {
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neg = 1;
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ul = -(long)ul;
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}
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base = 10;
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goto number;
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case 'o':
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ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
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base = 8;
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goto number;
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case 'u':
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ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
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base = 10;
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goto number;
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case 'z':
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ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
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if ((long)ul < 0) {
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neg = 1;
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ul = -(long)ul;
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}
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base = 16;
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goto number;
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case 'x':
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ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
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base = 16;
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number: p = (char *)db_ksprintn(ul, base, &tmp);
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if (sharpflag && ul != 0) {
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if (base == 8)
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tmp++;
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else if (base == 16)
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tmp += 2;
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}
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if (neg)
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tmp++;
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if (!ladjust && width && (width -= tmp) > 0)
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while (width--)
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db_putchar(padc);
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if (neg)
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db_putchar ('-');
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if (sharpflag && ul != 0) {
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if (base == 8) {
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db_putchar ('0');
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} else if (base == 16) {
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db_putchar ('0');
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db_putchar ('x');
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}
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}
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if (ladjust && width && (width -= tmp) > 0)
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while (width--)
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db_putchar(padc);
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while (ch = *p--)
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db_putchar(ch);
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break;
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default:
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db_putchar('%');
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if (lflag)
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db_putchar('l');
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/* FALLTHROUGH */
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case '%':
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db_putchar(ch);
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}
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}
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}
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