| #define _GNU_SOURCE | |
| #include <stdarg.h> | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| int vasprintf(char** s, const char* fmt, va_list ap) { | |
| va_list ap2; | |
| va_copy(ap2, ap); | |
| int l = vsnprintf(0, 0, fmt, ap2); | |
| va_end(ap2); | |
| if (l < 0 || !(*s = malloc(l + 1U))) | |
| return -1; | |
| return vsnprintf(*s, l + 1U, fmt, ap); | |
| } |