1 /* 2 * The authors of this software are Rob Pike and Ken Thompson. 3 * Copyright (c) 2002 by Lucent Technologies. 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose without fee is hereby granted, provided that this entire notice 6 * is included in all copies of any software which is or includes a copy 7 * or modification of this software and in all copies of the supporting 8 * documentation for such software. 9 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED 10 * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY 11 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY 12 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. 13 */ 14 #include "lib9.h" 15 #include "fmtdef.h" 16 17 int 18 vsnprint(char *buf, int len, char *fmt, va_list args) 19 { 20 Fmt f; 21 22 if(len <= 0) 23 return -1; 24 f.runes = 0; 25 f.start = buf; 26 f.to = buf; 27 f.stop = buf + len - 1; 28 f.flush = nil; 29 f.farg = nil; 30 f.nfmt = 0; 31 va_copy(f.args, args); 32 dofmt(&f, fmt); 33 va_end(f.args); 34 *(char*)f.to = '\0'; 35 return (char*)f.to - buf; 36 } 37