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
|
#include <stdarg.h>
#include <stdbool.h>
#include <kogata/debug.h>
#include <kogata/printf.h>
int snprintf(char * buff, size_t len, const char *format, ...) {
va_list ap;
va_start(ap, format);
len = vsnprintf(buff, len, format, ap);
va_end(ap);
return len;
}
struct vsnprintf_s {
char* buff;
size_t len;
size_t i;
};
int vsnprintf_putc_fun(int c, void* p) {
struct vsnprintf_s *s = (struct vsnprintf_s*)p;
if (s->i < s->len - 1) {
s->buff[s->i] = c;
s->i++;
return 1;
} else {
return 0;
}
}
int vsnprintf(char *buff, size_t len, const char* format, va_list arg){
if (!buff || !format)
return -1;
struct vsnprintf_s s;
s.buff = buff;
s.len = len;
s.i = 0;
size_t ret = vcprintf(vsnprintf_putc_fun, &s, format, arg);
ASSERT(ret == s.i);
buff[s.i] = 0;
return s.i;
}
int vcprintf(int (*putc_fun)(int c, void* p), void* p, const char* format, va_list ap) {
if (!format) return -1;
int ret = 0;
#define PUTCHAR(thechar) { int _tmp = putc_fun(thechar, p);\
if (_tmp == 1) ret++; \
else if (_tmp == 0) return ret; \
else if (_tmp < 0) return _tmp; }
size_t i;
for(i = 0; format[i] != '\0' ; i++) {
if (format[i] == '%') {
i++;
int u = 0;
int l = 0;
bool spec = true;
while (spec) {
if (format[i] == 'l') {
l++;
i++;
} else if (format[i] == 'u') {
u = 1;
i++;
} else {
spec = false;
}
}
if (format[i] == '%') {
PUTCHAR('%');
} else if (format[i] == 'i' || format[i] == 'd') {
if (u) {
// TODO
} else {
long long int integer;
if (l == 0) integer = va_arg(ap, int);
if (l == 1) integer = va_arg(ap, long int);
if (l == 2) integer = va_arg(ap, long long int);
int cpt2 = 0;
char buff_int[32];
if (integer<0) {
PUTCHAR('-');
}
do {
int m10 = integer%10;
m10 = (m10 < 0)? -m10:m10;
buff_int[cpt2++] = (char)('0'+ m10);
integer = integer/10;
} while(integer != 0);
for(cpt2 = cpt2 - 1; cpt2 >= 0; cpt2--)
PUTCHAR(buff_int[cpt2]);
}
} else if (format[i] == 'c') {
int value = va_arg(ap,int);
PUTCHAR((char)value);
break;
} else if (format[i] == 's') {
char *string = va_arg(ap,char *);
if (!string)
string = "(null)";
for(; *string != '\0' ; string++)
PUTCHAR(*string);
} else if (format[i] == 'x') {
unsigned int hexa = va_arg(ap,int);
int had_nonzero = 0;
for(int j = 0; j < 8; j++) {
unsigned int nb = (unsigned int)(hexa << (j*4));
nb = (nb >> 28) & 0xf;
// Skip the leading zeros
if (nb == 0) {
if (had_nonzero) {
PUTCHAR('0');
}
} else {
had_nonzero = 1;
if (nb < 10) {
PUTCHAR('0'+nb);
} else {
PUTCHAR('a'+(nb-10));
}
}
}
if (!had_nonzero) {
PUTCHAR('0');
}
} else if (format[i] == 'p') {
unsigned int hexa = va_arg(ap,int);
for (int j = 0; j < 8; j++) {
unsigned int nb = (unsigned int)(hexa << (j*4));
nb = (nb >> 28) & 0xf;
if (nb < 10) {
PUTCHAR('0'+nb);
} else {
PUTCHAR('a'+(nb-10));
}
}
} else {
PUTCHAR('%');
PUTCHAR(format[i]);
}
} else {
PUTCHAR(format[i]);
}
}
return ret;
}
/* vim: set ts=4 sw=4 tw=0 noet :*/
|
