summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/xmon/nonstdio.c
blob: 5c1a50912229a0026b7b164aab94d7a8beab2818 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 1996-2005 Paul Mackerras.
 */
#include <linux/string.h>
#include <asm/udbg.h>
#include <asm/time.h>
#include "nonstdio.h"

static bool paginating, paginate_skipping;
static unsigned long paginate_lpp; /* Lines Per Page */
static unsigned long paginate_pos;

void xmon_start_pagination(void)
{
	paginating = true;
	paginate_skipping = false;
	paginate_pos = 0;
}

void xmon_end_pagination(void)
{
	paginating = false;
}

void xmon_set_pagination_lpp(unsigned long lpp)
{
	paginate_lpp = lpp;
}

static int xmon_readchar(void)
{
	if (udbg_getc)
		return udbg_getc();
	return -1;
}

static int xmon_write(const char *ptr, int nb)
{
	int rv = 0;
	const char *p = ptr, *q;
	const char msg[] = "[Hit a key (a:all, q:truncate, any:next page)]";

	if (nb <= 0)
		return rv;

	if (paginating && paginate_skipping)
		return nb;

	if (paginate_lpp) {
		while (paginating && (q = strchr(p, '\n'))) {
			rv += udbg_write(p, q - p + 1);
			p = q + 1;
			paginate_pos++;

			if (paginate_pos >= paginate_lpp) {
				udbg_write(msg, strlen(msg));

				switch (xmon_readchar()) {
				case 'a':
					paginating = false;
					break;
				case 'q':
					paginate_skipping = true;
					break;
				default:
					/* nothing */
					break;
				}

				paginate_pos = 0;
				udbg_write("\r\n", 2);

				if (paginate_skipping)
					return nb;
			}
		}
	}

	return rv + udbg_write(p, nb - (p - ptr));
}

int xmon_putchar(int c)
{
	char ch = c;

	if (c == '\n')
		xmon_putchar('\r');
	return xmon_write(&ch, 1) == 1? c: -1;
}

static char line[256];
static char *lineptr;
static int lineleft;

static int xmon_getchar(void)
{
	int c;

	if (lineleft == 0) {
		lineptr = line;
		for (;;) {
			c = xmon_readchar();
			if (c == -1 || c == 4)
				break;
			if (c == '\r' || c == '\n') {
				*lineptr++ = '\n';
				xmon_putchar('\n');
				break;
			}
			switch (c) {
			case 0177:
			case '\b':
				if (lineptr > line) {
					xmon_putchar('\b');
					xmon_putchar(' ');
					xmon_putchar('\b');
					--lineptr;
				}
				break;
			case 'U' & 0x1F:
				while (lineptr > line) {
					xmon_putchar('\b');
					xmon_putchar(' ');
					xmon_putchar('\b');
					--lineptr;
				}
				break;
			default:
				if (lineptr >= &line[sizeof(line) - 1])
					xmon_putchar('\a');
				else {
					xmon_putchar(c);
					*lineptr++ = c;
				}
			}
		}
		lineleft = lineptr - line;
		lineptr = line;
	}
	if (lineleft == 0)
		return -1;
	--lineleft;
	return *lineptr++;
}

char *xmon_gets(char *str, int nb)
{
	char *p;
	int c;

	for (p = str; p < str + nb - 1; ) {
		c = xmon_getchar();
		if (c == -1) {
			if (p == str)
				return NULL;
			break;
		}
		*p++ = c;
		if (c == '\n')
			break;
	}
	*p = 0;
	return str;
}

void xmon_printf(const char *format, ...)
{
	va_list args;
	static char xmon_outbuf[1024];
	int rc, n;

	va_start(args, format);
	n = vsnprintf(xmon_outbuf, sizeof(xmon_outbuf), format, args);
	va_end(args);

	rc = xmon_write(xmon_outbuf, n);

	if (n && rc == 0) {
		/* No udbg hooks, fallback to printk() - dangerous */
		printk("%s", xmon_outbuf);
	}
}

void xmon_puts(const char *str)
{
	xmon_write(str, strlen(str));
}