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
|
#include <stdlib.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdint.h>
#include <string.h>
extern char *itoa(int, char *, int);
void _exit(int code)
{
(void)code;
for (;;);
}
char *snprintf(char *buf, unsigned int max, const char *format, ...)
{
va_list args;
va_start(args, format);
if (buf == 0 || max == 0)
return 0;
static char nbuf[32];
unsigned int off = 0;
for (unsigned int i = 0; format[i] != '\0' && off < max; i++) {
if (format[i] == '%') {
i++;
nbuf[0] = '\0';
switch (format[i]) {
case 'd':
itoa(va_arg(args, int), nbuf, 10);
break;
case 'u':
itoa(va_arg(args, unsigned int), nbuf, 10);
break;
case 'x':
case 'p':
itoa(va_arg(args, unsigned int), nbuf, 16);
break;
case 'f':
itoa((int)va_arg(args, double), nbuf, 10);
continue;
break;
default:
buf[off++] = format[i];
nbuf[0] = '\0';
break;
}
if (nbuf[0] != '\0') {
for (unsigned int j = 0; off < max && j < 32 &&
nbuf[j] != '\0'; off++, j++)
buf[off] = nbuf[j];
}
} else {
buf[off++] = format[i];
}
}
buf[off >= max ? max - 1 : off] = '\0';
va_end(args);
return buf;
}
float strtof(const char *s, char **endptr)
{
(void)s;
(void)endptr;
return 0.0f;
}
int atoi(const char *s)
{
int n = 0;
for (unsigned int i = 0; isdigit(s[i]); i++) {
n *= 10;
n += s[i] - '0';
}
return n;
}
|
