summaryrefslogtreecommitdiff
path: root/sys/ddb/db_output.c
blob: 490954eeae38e9f2da9dce68764e75210404b9e4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
/*	$OpenBSD: db_output.c,v 1.7 1996/07/24 21:58:03 niklas Exp $	*/
/*	$NetBSD: db_output.c,v 1.13 1996/04/01 17:27:14 christos Exp $	*/

/* 
 * Mach Operating System
 * Copyright (c) 1993,1992,1991,1990 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 "AS IS"
 * 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 Mellon
 * the rights to redistribute these changes.
 */

/*
 * Printf and character output for debugger.
 */
#include <sys/param.h>
#include <sys/proc.h>

#include <machine/stdarg.h>

#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>

/*
 *	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)

int	db_output_position = 0;		/* output column */
int	db_output_line = 0;		/* output line number */
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 */

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));

/*
 * 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) {
		while (last_print < next_tab) { /* DON'T send a tab!!! */
			cnputc(' ');
			last_print++;
		}
	    }
	    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 */
	}
}

/*
 * Output character.  Buffer whitespace.
 */
void
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();
	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++;
	    }
	    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++;
	    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*/
int
#if __STDC__
db_printf(const char *fmt, ...)
#else
db_printf(fmt, va_alist)
	const char *fmt;
	va_dcl
#endif
{
	va_list	listp;
	va_start(listp, fmt);
	db_printf_guts (fmt, listp);
	va_end(listp);
	return 0;
}

/* alternate name */

/*VARARGS1*/
int
#if __STDC__
kdbprintf(const char *fmt, ...)
#else
kdbprintf(fmt, va_alist)
	char *fmt;
	va_dcl
#endif
{
	va_list	listp;
	va_start(listp, fmt);
	db_printf_guts (fmt, listp);
	va_end(listp);
	return 0;
}

/*
 * End line if too long.
 */
void
db_end_line()
{
	if (db_output_position >= db_max_width)
	    db_printf("\n");
}

/*
 * 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);
}

static void
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;
		while ((ch = *(u_char *)fmt++) != '%') {
			if (ch == '\0')
				return;
			db_putchar(ch);
		}
		lflag = 0;
		ladjust = 0;
		sharpflag = 0;
		neg = 0;
reswitch:	switch (ch = *(u_char *)fmt++) {
		case '0':
			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 *);
			for (p = db_ksprintn(ul, *p++, NULL);
			     (ch = *p--) !='\0';)
				db_putchar(ch);

			if (!ul)
				break;

			for (tmp = 0; (n = *p++) != '\0';) {
				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;
		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);
			while ((ch = *p++) != '\0')
				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':
			db_putchar ('0');
			db_putchar ('x');
			ul = (u_long) va_arg(ap, void *);
			base = 16;
			goto number;
		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);

			while ((ch = *p--) != '\0')
				db_putchar(ch);
			break;
		default:
			db_putchar('%');
			if (lflag)
				db_putchar('l');
			/* FALLTHROUGH */
		case '%':
			db_putchar(ch);
		}
	}
}