ref: 5fd2e746e1a2a00d2acbc0c3b1924b1ea22101e8
dir: /sys/src/ape/lib/ap/stdio/vsprintf.c/
/*
* pANS stdio -- vsprintf
*/
#include "iolib.h"
int vsprintf(char *buf, const char *fmt, va_list args){
int n;
FILE *f=_IO_sopenw();
if(f==NULL)
return 0;
setvbuf(f, buf, _IOFBF, 100000);
n=vfprintf(f, fmt, args);
_IO_sclose(f);
return n;
}