ref: c6a42c0410eb728bddab3c64d64991ec838fd643
dir: /libc/vsnprint.c/
#include <u.h> #include <libc.h> #include "fmtdef.h" int vsnprint(char *buf, int len, char *fmt, va_list args) { Fmt f; if(len <= 0) return -1; f.runes = 0; f.start = buf; f.to = buf; f.stop = buf + len - 1; f.flush = 0; f.farg = nil; f.nfmt = 0; VA_COPY(f.args,args); dofmt(&f, fmt); VA_END(f.args); *(char*)f.to = '\0'; return (char*)f.to - buf; }