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
|
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
struct s_cookie {
char *s;
};
size_t s_write(FILE *f, const unsigned char *s, size_t l) {
struct s_cookie *c = f->cookie;
memcpy(c->s, s, l);
c->s += l;
*(c->s) = '\0';
return l;
}
int vsprintf(char *str, const char *format, va_list ap) {
struct s_cookie c = {.s = str};
FILE f = {
.write = s_write,
.cookie = &c,
};
return vfprintf(&f, format, ap);
}
int sprintf(char *str, const char *format, ...) {
va_list ap;
va_start(ap, format);
int rc = vsprintf(str, format, ap);
va_end(ap);
return rc;
}
|
