ref: 9de1403358d4165b47b11a2ea9544237da9a34be
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;
}