NetBSD/sys/ddb/db_output.c

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/* $NetBSD: db_output.c,v 1.15 1996/10/28 08:42:13 fvdl Exp $ */
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/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/*
* Printf and character output for debugger.
*/
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#include <sys/param.h>
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#include <machine/stdarg.h>
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#include <dev/cons.h>
#include <machine/db_machdep.h>
#include <ddb/db_command.h>
#include <ddb/db_output.h>
#include <ddb/db_interface.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
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/*
* Character output - tracks position in line.
* To do this correctly, we should know how wide
* the output device is - then we could zero
* the line position when the output device wraps
* around to the start of the next line.
*
* Instead, we count the number of spaces printed
* since the last printing character so that we
* don't print trailing spaces. This avoids most
* of the wraparounds.
*/
#ifndef DB_MAX_LINE
#define DB_MAX_LINE 24 /* maximum line */
#define DB_MAX_WIDTH 80 /* maximum width */
#endif DB_MAX_LINE
#define DB_MIN_MAX_WIDTH 20 /* minimum max width */
#define DB_MIN_MAX_LINE 3 /* minimum max line */
#define CTRL(c) ((c) & 0xff)
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int db_output_position = 0; /* output column */
int db_output_line = 0; /* output line number */
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int db_last_non_space = 0; /* last non-space character */
int db_tab_stop_width = 8; /* how wide are tab stops? */
#define NEXT_TAB(i) \
((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width)
int db_max_line = DB_MAX_LINE; /* output max lines */
int db_max_width = DB_MAX_WIDTH; /* output line width */
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static void db_more __P((void));
static char *db_ksprintn __P((u_long, int, int *));
static void db_printf_guts __P((const char *, va_list));
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/*
* Force pending whitespace.
*/
void
db_force_whitespace()
{
register int last_print, next_tab;
last_print = db_last_non_space;
while (last_print < db_output_position) {
next_tab = NEXT_TAB(last_print);
if (next_tab <= db_output_position) {
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while (last_print < next_tab) { /* DON'T send a tab!!! */
cnputc(' ');
last_print++;
}
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}
else {
cnputc(' ');
last_print++;
}
}
db_last_non_space = db_output_position;
}
static void
db_more()
{
register char *p;
int quit_output = 0;
for (p = "--db_more--"; *p; p++)
cnputc(*p);
switch(cngetc()) {
case ' ':
db_output_line = 0;
break;
case 'q':
case CTRL('c'):
db_output_line = 0;
quit_output = 1;
break;
default:
db_output_line--;
break;
}
p = "\b\b\b\b\b\b\b\b\b\b\b \b\b\b\b\b\b\b\b\b\b\b";
while (*p)
cnputc(*p++);
if (quit_output) {
db_error(0);
/* NOTREACHED */
}
}
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/*
* Output character. Buffer whitespace.
*/
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void
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db_putchar(c)
int c; /* character to output */
{
if (db_max_line >= DB_MIN_MAX_LINE && db_output_line >= db_max_line-1)
db_more();
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if (c > ' ' && c <= '~') {
/*
* Printing character.
* If we have spaces to print, print them first.
* Use tabs if possible.
*/
db_force_whitespace();
cnputc(c);
db_output_position++;
if (db_max_width >= DB_MIN_MAX_WIDTH
&& db_output_position >= db_max_width-1) {
/* auto new line */
cnputc('\n');
db_output_position = 0;
db_last_non_space = 0;
db_output_line++;
}
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db_last_non_space = db_output_position;
}
else if (c == '\n') {
/* Return */
cnputc(c);
db_output_position = 0;
db_last_non_space = 0;
db_output_line++;
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db_check_interrupt();
}
else if (c == '\t') {
/* assume tabs every 8 positions */
db_output_position = NEXT_TAB(db_output_position);
}
else if (c == ' ') {
/* space */
db_output_position++;
}
else if (c == '\007') {
/* bell */
cnputc(c);
}
/* other characters are assumed non-printing */
}
/*
* Return output position
*/
int
db_print_position()
{
return (db_output_position);
}
/*
* Printing
*/
extern int db_radix;
/*VARARGS1*/
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void
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#if __STDC__
db_printf(const char *fmt, ...)
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#else
db_printf(fmt, va_alist)
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const char *fmt;
va_dcl
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#endif
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{
va_list listp;
va_start(listp, fmt);
db_printf_guts (fmt, listp);
va_end(listp);
}
/* alternate name */
/*VARARGS1*/
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void
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#if __STDC__
kdbprintf(const char *fmt, ...)
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#else
kdbprintf(fmt, va_alist)
char *fmt;
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va_dcl
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#endif
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{
va_list listp;
va_start(listp, fmt);
db_printf_guts (fmt, listp);
va_end(listp);
}
/*
* End line if too long.
*/
void
db_end_line()
{
if (db_output_position >= db_max_width)
db_printf("\n");
}
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/*
* Put a number (base <= 16) in a buffer in reverse order; return an
* optional length and a pointer to the NULL terminated (preceded?)
* buffer.
*/
static char *
db_ksprintn(ul, base, lenp)
register u_long ul;
register int base, *lenp;
{ /* A long in base 8, plus NULL. */
static char buf[sizeof(long) * NBBY / 3 + 2];
register char *p;
p = buf;
do {
*++p = "0123456789abcdef"[ul % base];
} while (ul /= base);
if (lenp)
*lenp = p - buf;
return (p);
}
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static void
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db_printf_guts(fmt, ap)
register const char *fmt;
va_list ap;
{
register char *p;
register int ch, n;
u_long ul;
int base, lflag, tmp, width;
char padc;
int ladjust;
int sharpflag;
int neg;
for (;;) {
padc = ' ';
width = 0;
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while ((ch = *(const u_char *)fmt++) != '%') {
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if (ch == '\0')
return;
db_putchar(ch);
}
lflag = 0;
ladjust = 0;
sharpflag = 0;
neg = 0;
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reswitch: switch (ch = *(const u_char *)fmt++) {
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case '0':
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case '.':
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padc = '0';
goto reswitch;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
for (width = 0;; ++fmt) {
width = width * 10 + ch - '0';
ch = *fmt;
if (ch < '0' || ch > '9')
break;
}
goto reswitch;
case 'l':
lflag = 1;
goto reswitch;
case '-':
ladjust = 1;
goto reswitch;
case '#':
sharpflag = 1;
goto reswitch;
case 'b':
ul = va_arg(ap, int);
p = va_arg(ap, char *);
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for (p = db_ksprintn(ul, *p++, NULL);
(ch = *p--) !='\0';)
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db_putchar(ch);
if (!ul)
break;
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for (tmp = 0; (n = *p++) != '\0';) {
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if (ul & (1 << (n - 1))) {
db_putchar(tmp ? ',' : '<');
for (; (n = *p) > ' '; ++p)
db_putchar(n);
tmp = 1;
} else
for (; *p > ' '; ++p);
}
if (tmp)
db_putchar('>');
break;
case '*':
width = va_arg (ap, int);
if (width < 0) {
ladjust = !ladjust;
width = -width;
}
goto reswitch;
case ':':
p = va_arg(ap, char *);
db_printf_guts (p, va_arg(ap, va_list));
break;
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case 'c':
db_putchar(va_arg(ap, int));
break;
case 's':
p = va_arg(ap, char *);
width -= strlen (p);
if (!ladjust && width > 0)
while (width--)
db_putchar (padc);
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while ((ch = *p++) != '\0')
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db_putchar(ch);
if (ladjust && width > 0)
while (width--)
db_putchar (padc);
break;
case 'r':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
if ((long)ul < 0) {
neg = 1;
ul = -(long)ul;
}
base = db_radix;
if (base < 8 || base > 16)
base = 10;
goto number;
case 'n':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = db_radix;
if (base < 8 || base > 16)
base = 10;
goto number;
case 'd':
ul = lflag ? va_arg(ap, long) : va_arg(ap, int);
if ((long)ul < 0) {
neg = 1;
ul = -(long)ul;
}
base = 10;
goto number;
case 'o':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 8;
goto number;
case 'p':
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db_putchar ('0');
db_putchar ('x');
ul = (u_long) va_arg(ap, void *);
base = 16;
goto number;
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case 'u':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 10;
goto number;
case 'z':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
if ((long)ul < 0) {
neg = 1;
ul = -(long)ul;
}
base = 16;
goto number;
case 'x':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 16;
number: p = (char *)db_ksprintn(ul, base, &tmp);
if (sharpflag && ul != 0) {
if (base == 8)
tmp++;
else if (base == 16)
tmp += 2;
}
if (neg)
tmp++;
if (!ladjust && width && (width -= tmp) > 0)
while (width--)
db_putchar(padc);
if (neg)
db_putchar ('-');
if (sharpflag && ul != 0) {
if (base == 8) {
db_putchar ('0');
} else if (base == 16) {
db_putchar ('0');
db_putchar ('x');
}
}
if (ladjust && width && (width -= tmp) > 0)
while (width--)
db_putchar(padc);
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while ((ch = *p--) != '\0')
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db_putchar(ch);
break;
default:
db_putchar('%');
if (lflag)
db_putchar('l');
/* FALLTHROUGH */
case '%':
db_putchar(ch);
}
}
}