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
|
/*
* Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <debug.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#define get_num_va_args(_args, _lcount) \
(((_lcount) > 1) ? va_arg(_args, long long int) : \
(((_lcount) == 1) ? va_arg(_args, long int) : \
va_arg(_args, int)))
#define get_unum_va_args(_args, _lcount) \
(((_lcount) > 1) ? va_arg(_args, unsigned long long int) : \
(((_lcount) == 1) ? va_arg(_args, unsigned long int) : \
va_arg(_args, unsigned int)))
static int string_print(const char *str)
{
int count = 0;
assert(str != NULL);
for ( ; *str != '\0'; str++) {
(void)putchar(*str);
count++;
}
return count;
}
static int unsigned_num_print(unsigned long long int unum, unsigned int radix,
char padc, int padn)
{
/* Just need enough space to store 64 bit decimal integer */
char num_buf[20];
int i = 0, count = 0;
unsigned int rem;
do {
rem = unum % radix;
if (rem < 0xa)
num_buf[i] = '0' + rem;
else
num_buf[i] = 'a' + (rem - 0xa);
i++;
unum /= radix;
} while (unum > 0U);
if (padn > 0) {
while (i < padn) {
(void)putchar(padc);
count++;
padn--;
}
}
while (--i >= 0) {
(void)putchar(num_buf[i]);
count++;
}
return count;
}
/*******************************************************************
* Reduced format print for Trusted firmware.
* The following type specifiers are supported by this print
* %x - hexadecimal format
* %s - string format
* %d or %i - signed decimal format
* %u - unsigned decimal format
* %p - pointer format
*
* The following length specifiers are supported by this print
* %l - long int (64-bit on AArch64)
* %ll - long long int (64-bit on AArch64)
* %z - size_t sized integer formats (64 bit on AArch64)
*
* The following padding specifiers are supported by this print
* %0NN - Left-pad the number with 0s (NN is a decimal number)
*
* The print exits on all other formats specifiers other than valid
* combinations of the above specifiers.
*******************************************************************/
int vprintf(const char *fmt, va_list args)
{
int l_count;
long long int num;
unsigned long long int unum;
char *str;
char padc = '\0'; /* Padding character */
int padn; /* Number of characters to pad */
int count = 0; /* Number of printed characters */
while (*fmt != '\0') {
l_count = 0;
padn = 0;
if (*fmt == '%') {
fmt++;
/* Check the format specifier */
loop:
switch (*fmt) {
case 'i': /* Fall through to next one */
case 'd':
num = get_num_va_args(args, l_count);
if (num < 0) {
(void)putchar('-');
unum = (unsigned long long int)-num;
padn--;
} else
unum = (unsigned long long int)num;
count += unsigned_num_print(unum, 10,
padc, padn);
break;
case 's':
str = va_arg(args, char *);
count += string_print(str);
break;
case 'p':
unum = (uintptr_t)va_arg(args, void *);
if (unum > 0U) {
count += string_print("0x");
padn -= 2;
}
count += unsigned_num_print(unum, 16,
padc, padn);
break;
case 'x':
unum = get_unum_va_args(args, l_count);
count += unsigned_num_print(unum, 16,
padc, padn);
break;
case 'z':
if (sizeof(size_t) == 8U)
l_count = 2;
fmt++;
goto loop;
case 'l':
l_count++;
fmt++;
goto loop;
case 'u':
unum = get_unum_va_args(args, l_count);
count += unsigned_num_print(unum, 10,
padc, padn);
break;
case '0':
padc = '0';
padn = 0;
fmt++;
for (;;) {
char ch = *fmt;
if ((ch < '0') || (ch > '9')) {
goto loop;
}
padn = (padn * 10) + (ch - '0');
fmt++;
}
assert(0); /* Unreachable */
default:
/* Exit on any other format specifier */
return -1;
}
fmt++;
continue;
}
(void)putchar(*fmt);
fmt++;
count++;
}
return count;
}
int printf(const char *fmt, ...)
{
int count;
va_list va;
va_start(va, fmt);
count = vprintf(fmt, va);
va_end(va);
return count;
}
|
