preserve errno across free
[musl.git] / src / stdio / vasprintf.c
blob08251bc20ecd240a53335357341f89000ce5efa6
1 #define _GNU_SOURCE
2 #include <stdio.h>
3 #include <stdarg.h>
4 #include <stdlib.h>
6 int vasprintf(char **s, const char *fmt, va_list ap)
8 va_list ap2;
9 va_copy(ap2, ap);
10 int l = vsnprintf(0, 0, fmt, ap2);
11 va_end(ap2);
13 if (l<0 || !(*s=malloc(l+1U))) return -1;
14 return vsnprintf(*s, l+1U, fmt, ap);