| #define _GNU_SOURCE |
| #define __CRT__NO_INLINE |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stdarg.h> |
| |
| int asprintf(char ** __restrict__ ret, |
| const char * __restrict__ format, |
| ...) { |
| va_list ap; |
| int len; |
| va_start(ap,format); |
| /* Get Length */ |
| len = _vsnprintf(NULL,0,format,ap); |
| if (len < 0) goto _end; |
| /* +1 for \0 terminator. */ |
| *ret = malloc(len + 1); |
| /* Check malloc fail*/ |
| if (!*ret) { |
| len = -1; |
| goto _end; |
| } |
| /* Write String */ |
| _vsnprintf(*ret,len+1,format,ap); |
| /* Terminate explicitly */ |
| (*ret)[len] = '\0'; |
| _end: |
| va_end(ap); |
| return len; |
| } |