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
|
/* A reduced version of the printf function.
Copyright (C) 2011 Richard Henderson
This file is part of QEMU PALcode.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the text
of the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not see
<http://www.gnu.org/licenses/>. */
#include <stdarg.h>
#include <stdbool.h>
#include "uart.h"
static int print_decimal(unsigned long val)
{
char buf[32];
char *p = buf+31;
*p = 0;
if (val == 0)
*--p = '0';
else
{
do
{
unsigned long d, r;
/* Compiling with -Os results in a call to the division routine.
Do what the compiler ought to have done. */
d = __builtin_alpha_umulh(val, 0xcccccccccccccccd);
d >>= 3;
r = val - (d * 10);
*--p = r + '0';
val = d;
}
while (val);
}
uart_puts(COM1, p+1);
return sizeof(buf) - (p - buf);
}
static int print_hex(unsigned long val)
{
char buf[32];
char *p = buf+31;
*p = 0;
if (val == 0)
*--p = '0';
else
{
do
{
int d = val % 16;
*--p = (d < 10 ? '0' : 'a' - 10) + d;
val /= 16;
}
while (val);
}
uart_puts(COM1, p+1);
return sizeof(buf) - (p - buf);
}
int printf(const char *fmt, ...)
{
va_list args;
unsigned long val;
int r = 0;
va_start(args, fmt);
for (; *fmt ; fmt++)
if (*fmt != '%')
{
uart_putchar(COM1, *fmt);
r++;
}
else
{
bool is_long = false;
restart:
switch (*++fmt)
{
case '%':
uart_putchar(COM1, '%');
r++;
break;
case 'l':
is_long = true;
goto restart;
case 'd':
if (is_long)
{
long d = va_arg (args, long);
if (d < 0)
{
uart_putchar(COM1, '-');
d = -d;
}
val = d;
}
else
{
int d = va_arg (args, int);
if (d < 0)
{
uart_putchar(COM1, '-');
d = -d;
r++;
}
val = d;
}
goto do_unsigned;
case 'u':
if (is_long)
val = va_arg (args, unsigned long);
else
val = va_arg (args, unsigned int);
do_unsigned:
r += print_decimal (val);
break;
case 'x':
if (is_long)
val = va_arg (args, unsigned long);
else
val = va_arg (args, unsigned int);
r += print_hex (val);
case 's':
{
const char *s = va_arg (args, const char *);
while (*s)
{
uart_putchar(COM1, *s++);
r++;
}
break;
}
default:
uart_putchar(COM1, '%');
uart_putchar(COM1, *fmt);
r += 2;
break;
}
}
va_end(args);
return r;
}
|
