1#define _GNU_SOURCE
2#define __CRT__NO_INLINE
3
4#include <stdio.h>
5#include <stdlib.h>
6#include <stdarg.h>
7
8int asprintf(char ** __restrict__ ret,
9 const char * __restrict__ format,
10 ...) {
11 va_list ap;
12 int len;
13 va_start(ap,format);
14 /* Get Length */
15 len = _vscprintf(format,ap);
16 if (len < 0) goto _end;
17 /* +1 for \0 terminator. */
18 *ret = malloc(len + 1);
19 /* Check malloc fail*/
20 if (!*ret) {
21 len = -1;
22 goto _end;
23 }
24 /* Write String */
25 _vsnprintf(*ret,len+1,format,ap);
26 /* Terminate explicitly */
27 (*ret)[len] = '\0';
28 _end:
29 va_end(ap);
30 return len;
31}