vsnprint.c (1203B)
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 11 * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY 12 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. 13 */ 14 #include <stdlib.h> 15 #include <stdarg.h> 16 #include "plan9.h" 17 #include "fmt.h" 18 #include "fmtdef.h" 19 20 int 21 vsnprint(char *buf, int len, const char *fmt, va_list args) 22 { 23 Fmt f; 24 25 if(len <= 0) 26 return -1; 27 f.runes = 0; 28 f.start = buf; 29 f.to = buf; 30 f.stop = buf + len - 1; 31 f.flush = 0; 32 f.farg = nil; 33 f.nfmt = 0; 34 va_copy(f.args,args); 35 fmtlocaleinit(&f, nil, nil, nil); 36 dofmt(&f, fmt); 37 va_end(f.args); 38 *(char*)f.to = '\0'; 39 return (char*)f.to - buf; 40 }