1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2011 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Eclipse Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.eclipse.org/org/documents/epl-v10.html * 11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #pragma prototyped 23 24 #include "stdhdr.h" 25 26 int 27 vsnprintf(char* s, int n, const char* form, va_list args) 28 { 29 Sfio_t* f; 30 ssize_t rv; 31 32 /* make a temp stream */ 33 if(!(f = sfnew(NIL(Sfio_t*),NIL(char*),(size_t)SF_UNBOUND, 34 -1,SF_WRITE|SF_STRING)) ) 35 return -1; 36 37 if((rv = sfvprintf(f,form,args)) >= 0 ) 38 { if(s && n > 0) 39 { if((rv+1) >= n) 40 n--; 41 else 42 n = rv; 43 memcpy(s, f->data, n); 44 s[n] = 0; 45 } 46 _Sfi = rv; 47 } 48 49 sfclose(f); 50 51 return rv; 52 } 53