ref: 990ceeef3bfd9d56e2e6dd39cf5ac185b1a2de08
dir: /sys/src/ape/lib/ap/stdio/vsnprintf.c/
/*
* pANS stdio -- vsnprintf
*/
#include "iolib.h"
int vsnprintf(char *buf, size_t nbuf, const char *fmt, va_list args){
int n;
FILE *f=_IO_sopenw();
if(f==NULL)
return 0;
setvbuf(f, buf, _IOFBF, nbuf);
n=vfprintf(f, fmt, args);
_IO_sclose(f);
return n;
}