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
|
// MIT License, Copyright (c) 2021 Marvin Borner
#include <library.h>
/**
* Common string functions
*/
u32 strlen(const char *str)
{
const char *s = str;
while (*s)
s++;
return s - str;
}
u32 strnlen(const char *str, u32 max)
{
const char *s = str;
while (max && *s) {
s++;
max--;
}
return s - str;
}
u32 strlcpy(char *dst, const char *src, u32 size)
{
const char *orig = src;
u32 left = size;
if (left)
while (--left)
if (!(*dst++ = *src++))
break;
if (!left) {
if (size)
*dst = 0;
while (*src++)
;
}
return src - orig - 1;
}
s32 strncmp(const char *s1, const char *s2, u32 n)
{
const u8 *c1 = (const u8 *)s1;
const u8 *c2 = (const u8 *)s2;
u8 ch;
s32 d = 0;
while (n--) {
d = (s32)(ch = *c1++) - (s32)*c2++;
if (d || !ch)
break;
}
return d;
}
/**
* Common memory functions
*/
void *memcpy(void *dest, const void *src, u32 n)
{
// Inspired by jgraef at osdev
u32 num_dwords = n / 4;
u32 num_bytes = n % 4;
u32 *dest32 = (u32 *)dest;
const u32 *src32 = (const u32 *)src;
u8 *dest8 = ((u8 *)dest) + num_dwords * 4;
const u8 *src8 = ((const u8 *)src) + num_dwords * 4;
__asm__ volatile("rep movsl\n"
: "=S"(src32), "=D"(dest32), "=c"(num_dwords)
: "S"(src32), "D"(dest32), "c"(num_dwords)
: "memory");
for (u32 i = 0; i < num_bytes; i++)
dest8[i] = src8[i];
return dest;
}
void *memset(void *dest, u32 val, u32 n)
{
// Inspired by jgraef at osdev
u32 uval = val;
u32 num_dwords = n / 4;
u32 num_bytes = n % 4;
u32 *dest32 = (u32 *)dest;
u8 *dest8 = ((u8 *)dest) + num_dwords * 4;
u8 val8 = (u8)val;
u32 val32 = uval | (uval << 8) | (uval << 16) | (uval << 24);
__asm__ volatile("rep stosl\n"
: "=D"(dest32), "=c"(num_dwords)
: "D"(dest32), "c"(num_dwords), "a"(val32)
: "memory");
for (u32 i = 0; i < num_bytes; i++)
dest8[i] = val8;
return dest;
}
s32 memcmp(const void *s1, const void *s2, u32 n)
{
const u8 *a = (const u8 *)s1;
const u8 *b = (const u8 *)s2;
for (u32 i = 0; i < n; i++) {
if (a[i] < b[i])
return -1;
else if (b[i] < a[i])
return 1;
}
return 0;
}
/**
* Conversion
*/
s32 itoa(s32 value, char *buffer, u32 base)
{
char tmp[16];
char *tp = tmp;
s32 i;
unsigned v;
s32 sign = (base == 10 && value < 0);
if (sign)
v = -value;
else
v = (unsigned)value;
while (v || tp == tmp) {
i = v % base;
v /= base;
if (i < 10)
*tp++ = i + '0';
else
*tp++ = i + 'a' - 10;
}
s32 len = tp - tmp;
if (sign) {
*buffer++ = '-';
len++;
}
while (tp > tmp)
*buffer++ = *--tp;
*buffer = '\0';
return len;
}
// From stackoverflow
s32 atoi(const char *inp)
{
s32 ret = 0;
while (*inp) {
ret = (ret << 3) + (ret << 1) + (*inp) - '0';
inp++;
}
return ret;
}
|
