ref: 5fc2f6af6c9d938dca7dd4b8df061d9eeb87ec75
dir: /sys/src/libstdio/vsprintf.c/
/*
* pANS stdio -- vsprintf
*/
#include "iolib.h"
int vsprintf(char *buf, const char *fmt, va_list args){
int n;
FILE *f=sopenw();
if(f==NULL)
return 0;
setvbuf(f, buf, _IOFBF, 100000);
n=vfprintf(f, fmt, args);
sclose(f);
return n;
}