ref: 8188b4f4f0e07b6669e6ae3c6c1099af917eaab4
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; }