190792Sgshapiro/* 2261370Sgshapiro * Copyright (c) 2000-2001 Proofpoint, Inc. and its suppliers. 390792Sgshapiro * All rights reserved. 490792Sgshapiro * Copyright (c) 1990, 1993 590792Sgshapiro * The Regents of the University of California. All rights reserved. 690792Sgshapiro * 790792Sgshapiro * This code is derived from software contributed to Berkeley by 890792Sgshapiro * Chris Torek. 990792Sgshapiro * 1090792Sgshapiro * By using this file, you agree to the terms and conditions set 1190792Sgshapiro * forth in the LICENSE file which can be found at the top level of 1290792Sgshapiro * the sendmail distribution. 1390792Sgshapiro */ 1490792Sgshapiro 1590792Sgshapiro#include <sm/gen.h> 16266711SgshapiroSM_RCSID("@(#)$Id: vsnprintf.c,v 1.24 2013-11-22 20:51:44 ca Exp $") 1790792Sgshapiro#include <limits.h> 1890792Sgshapiro#include <sm/io.h> 1990792Sgshapiro#include "local.h" 2090792Sgshapiro 2190792Sgshapiro/* 2290792Sgshapiro** SM_VSNPRINTF -- format data for "output" into a string 2390792Sgshapiro** 2490792Sgshapiro** Assigned 'str' to a "fake" file pointer. This allows common 2590792Sgshapiro** o/p formatting function sm_vprintf() to be used. 2690792Sgshapiro** 2790792Sgshapiro** Parameters: 2890792Sgshapiro** str -- location for output 2990792Sgshapiro** n -- maximum size for o/p 3090792Sgshapiro** fmt -- format directives 3190792Sgshapiro** ap -- data unit vectors for use by 'fmt' 3290792Sgshapiro** 3390792Sgshapiro** Results: 3490792Sgshapiro** result from sm_io_vfprintf() 3590792Sgshapiro** 3690792Sgshapiro** Side Effects: 3790792Sgshapiro** Limits the size ('n') to INT_MAX. 3890792Sgshapiro*/ 3990792Sgshapiro 4090792Sgshapiroint 4190792Sgshapirosm_vsnprintf(str, n, fmt, ap) 4290792Sgshapiro char *str; 4390792Sgshapiro size_t n; 4490792Sgshapiro const char *fmt; 4590792Sgshapiro SM_VA_LOCAL_DECL 4690792Sgshapiro{ 4790792Sgshapiro int ret; 4890792Sgshapiro char dummy; 4990792Sgshapiro SM_FILE_T fake; 5090792Sgshapiro 5190792Sgshapiro /* While snprintf(3) specifies size_t stdio uses an int internally */ 5290792Sgshapiro if (n > INT_MAX) 5390792Sgshapiro n = INT_MAX; 5490792Sgshapiro 5590792Sgshapiro /* Stdio internals do not deal correctly with zero length buffer */ 5690792Sgshapiro if (n == 0) 5790792Sgshapiro { 5890792Sgshapiro str = &dummy; 5990792Sgshapiro n = 1; 6090792Sgshapiro } 6190792Sgshapiro fake.sm_magic = SmFileMagic; 6290792Sgshapiro fake.f_timeout = SM_TIME_FOREVER; 6390792Sgshapiro fake.f_timeoutstate = SM_TIME_BLOCK; 6490792Sgshapiro fake.f_file = -1; 6590792Sgshapiro fake.f_flags = SMWR | SMSTR; 6690792Sgshapiro fake.f_bf.smb_base = fake.f_p = (unsigned char *)str; 6790792Sgshapiro fake.f_bf.smb_size = fake.f_w = n - 1; 6890792Sgshapiro fake.f_close = NULL; 6990792Sgshapiro fake.f_open = NULL; 7090792Sgshapiro fake.f_read = NULL; 7190792Sgshapiro fake.f_write = NULL; 7290792Sgshapiro fake.f_seek = NULL; 7390792Sgshapiro fake.f_setinfo = fake.f_getinfo = NULL; 7490792Sgshapiro fake.f_type = "sm_vsnprintf:fake"; 7590792Sgshapiro ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap); 7690792Sgshapiro *fake.f_p = 0; 7790792Sgshapiro return ret; 7890792Sgshapiro} 79