17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. 37c478bd9Sstevel@tonic-gate * All rights reserved. 47c478bd9Sstevel@tonic-gate * Copyright (c) 1990, 1993 57c478bd9Sstevel@tonic-gate * The Regents of the University of California. All rights reserved. 67c478bd9Sstevel@tonic-gate * 77c478bd9Sstevel@tonic-gate * This code is derived from software contributed to Berkeley by 87c478bd9Sstevel@tonic-gate * Chris Torek. 97c478bd9Sstevel@tonic-gate * 107c478bd9Sstevel@tonic-gate * By using this file, you agree to the terms and conditions set 117c478bd9Sstevel@tonic-gate * forth in the LICENSE file which can be found at the top level of 127c478bd9Sstevel@tonic-gate * the sendmail distribution. 137c478bd9Sstevel@tonic-gate */ 147c478bd9Sstevel@tonic-gate 157c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 167c478bd9Sstevel@tonic-gate 177c478bd9Sstevel@tonic-gate #include <sm/gen.h> 18*058561cbSjbeck SM_RCSID("@(#)$Id: snprintf.c,v 1.24 2006/10/12 21:50:10 ca Exp $") 197c478bd9Sstevel@tonic-gate #include <limits.h> 207c478bd9Sstevel@tonic-gate #include <sm/varargs.h> 217c478bd9Sstevel@tonic-gate #include <sm/io.h> 22*058561cbSjbeck #include <sm/string.h> 237c478bd9Sstevel@tonic-gate #include "local.h" 247c478bd9Sstevel@tonic-gate 257c478bd9Sstevel@tonic-gate /* 267c478bd9Sstevel@tonic-gate ** SM_SNPRINTF -- format a string to a memory location of restricted size 277c478bd9Sstevel@tonic-gate ** 287c478bd9Sstevel@tonic-gate ** Parameters: 297c478bd9Sstevel@tonic-gate ** str -- memory location to place formatted string 307c478bd9Sstevel@tonic-gate ** n -- size of buffer pointed to by str, capped to 317c478bd9Sstevel@tonic-gate ** a maximum of INT_MAX 327c478bd9Sstevel@tonic-gate ** fmt -- the formatting directives 337c478bd9Sstevel@tonic-gate ** ... -- the data to satisfy the formatting 347c478bd9Sstevel@tonic-gate ** 357c478bd9Sstevel@tonic-gate ** Returns: 367c478bd9Sstevel@tonic-gate ** Failure: -1 377c478bd9Sstevel@tonic-gate ** Success: number of bytes that would have been written 387c478bd9Sstevel@tonic-gate ** to str, not including the trailing '\0', 397c478bd9Sstevel@tonic-gate ** up to a maximum of INT_MAX, as if there was 407c478bd9Sstevel@tonic-gate ** no buffer size limitation. If the result >= n 417c478bd9Sstevel@tonic-gate ** then the output was truncated. 427c478bd9Sstevel@tonic-gate ** 437c478bd9Sstevel@tonic-gate ** Side Effects: 447c478bd9Sstevel@tonic-gate ** If n > 0, then between 0 and n-1 bytes of formatted output 457c478bd9Sstevel@tonic-gate ** are written into 'str', followed by a '\0'. 467c478bd9Sstevel@tonic-gate */ 477c478bd9Sstevel@tonic-gate 487c478bd9Sstevel@tonic-gate int 497c478bd9Sstevel@tonic-gate #if SM_VA_STD 507c478bd9Sstevel@tonic-gate sm_snprintf(char *str, size_t n, char const *fmt, ...) 517c478bd9Sstevel@tonic-gate #else /* SM_VA_STD */ 527c478bd9Sstevel@tonic-gate sm_snprintf(str, n, fmt, va_alist) 537c478bd9Sstevel@tonic-gate char *str; 547c478bd9Sstevel@tonic-gate size_t n; 557c478bd9Sstevel@tonic-gate char *fmt; 567c478bd9Sstevel@tonic-gate va_dcl 577c478bd9Sstevel@tonic-gate #endif /* SM_VA_STD */ 587c478bd9Sstevel@tonic-gate { 597c478bd9Sstevel@tonic-gate int ret; 607c478bd9Sstevel@tonic-gate SM_VA_LOCAL_DECL 617c478bd9Sstevel@tonic-gate SM_FILE_T fake; 627c478bd9Sstevel@tonic-gate 637c478bd9Sstevel@tonic-gate /* While snprintf(3) specifies size_t stdio uses an int internally */ 647c478bd9Sstevel@tonic-gate if (n > INT_MAX) 657c478bd9Sstevel@tonic-gate n = INT_MAX; 667c478bd9Sstevel@tonic-gate SM_VA_START(ap, fmt); 677c478bd9Sstevel@tonic-gate 687c478bd9Sstevel@tonic-gate /* XXX put this into a static? */ 697c478bd9Sstevel@tonic-gate fake.sm_magic = SmFileMagic; 707c478bd9Sstevel@tonic-gate fake.f_file = -1; 717c478bd9Sstevel@tonic-gate fake.f_flags = SMWR | SMSTR; 727c478bd9Sstevel@tonic-gate fake.f_cookie = &fake; 737c478bd9Sstevel@tonic-gate fake.f_bf.smb_base = fake.f_p = (unsigned char *)str; 747c478bd9Sstevel@tonic-gate fake.f_bf.smb_size = fake.f_w = n ? n - 1 : 0; 757c478bd9Sstevel@tonic-gate fake.f_timeout = SM_TIME_FOREVER; 767c478bd9Sstevel@tonic-gate fake.f_timeoutstate = SM_TIME_BLOCK; 777c478bd9Sstevel@tonic-gate fake.f_close = NULL; 787c478bd9Sstevel@tonic-gate fake.f_open = NULL; 797c478bd9Sstevel@tonic-gate fake.f_read = NULL; 807c478bd9Sstevel@tonic-gate fake.f_write = NULL; 817c478bd9Sstevel@tonic-gate fake.f_seek = NULL; 827c478bd9Sstevel@tonic-gate fake.f_setinfo = fake.f_getinfo = NULL; 837c478bd9Sstevel@tonic-gate fake.f_type = "sm_snprintf:fake"; 847c478bd9Sstevel@tonic-gate ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap); 857c478bd9Sstevel@tonic-gate if (n > 0) 867c478bd9Sstevel@tonic-gate *fake.f_p = '\0'; 877c478bd9Sstevel@tonic-gate SM_VA_END(ap); 887c478bd9Sstevel@tonic-gate return ret; 897c478bd9Sstevel@tonic-gate } 90