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
|
/*
* Copyright (C) 2015 Virtual Open Systems SAS
* Author: Alexander Spyridakis <a.spyridakis@virtualopensystems.com>
*
* printf based on implementation by Kevin Wolf <kwolf@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* SPDX-License-Identifier: GPL-2.0-only
*/
#include "minilib.h"
typedef __builtin_va_list va_list;
#define va_start(ap, X) __builtin_va_start(ap, X)
#define va_arg(ap, type) __builtin_va_arg(ap, type)
#define va_end(ap) __builtin_va_end(ap)
static void print_str(char *s)
{
while (*s) {
__sys_outc(*s++);
}
}
static void print_num(unsigned long long value, int base)
{
char digits[] = "0123456789abcdef";
char buf[32];
int i = sizeof(buf) - 2, j;
/* Set the buffer to 0. See problem of before. */
for (j = 0; j < 32; j++) {
buf[j] = 0;
}
do {
buf[i--] = digits[value % base];
value /= base;
} while (value);
print_str(&buf[i + 1]);
}
void ml_printf(const char *fmt, ...)
{
va_list ap;
char *str;
int base;
int has_long;
int alt_form;
unsigned long long val;
va_start(ap, fmt);
for (; *fmt; fmt++) {
if (*fmt != '%') {
__sys_outc(*fmt);
continue;
}
fmt++;
if (*fmt == '#') {
fmt++;
alt_form = 1;
} else {
alt_form = 0;
}
if (*fmt == 'l') {
fmt++;
if (*fmt == 'l') {
fmt++;
has_long = 2;
} else {
has_long = 1;
}
} else {
has_long = 0;
}
switch (*fmt) {
case 'x':
case 'p':
base = 16;
goto convert_number;
case 'd':
case 'i':
case 'u':
base = 10;
goto convert_number;
case 'o':
base = 8;
goto convert_number;
convert_number:
switch (has_long) {
case 0:
val = va_arg(ap, unsigned int);
break;
case 1:
val = va_arg(ap, unsigned long);
break;
case 2:
val = va_arg(ap, unsigned long long);
break;
}
if (alt_form && base == 16) {
print_str("0x");
}
print_num(val, base);
break;
case 's':
str = va_arg(ap, char*);
print_str(str);
break;
case '%':
__sys_outc(*fmt);
break;
default:
__sys_outc('%');
__sys_outc(*fmt);
break;
}
}
va_end(ap);
}
|
