1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28*7c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 29*7c478bd9Sstevel@tonic-gate 30*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 31*7c478bd9Sstevel@tonic-gate 32*7c478bd9Sstevel@tonic-gate #include "synonyms.h" 33*7c478bd9Sstevel@tonic-gate #include <mtlib.h> 34*7c478bd9Sstevel@tonic-gate #include <stdarg.h> 35*7c478bd9Sstevel@tonic-gate #include <values.h> 36*7c478bd9Sstevel@tonic-gate #include <thread.h> 37*7c478bd9Sstevel@tonic-gate #include <synch.h> 38*7c478bd9Sstevel@tonic-gate #include <errno.h> 39*7c478bd9Sstevel@tonic-gate #include <sys/types.h> 40*7c478bd9Sstevel@tonic-gate #include "print.h" 41*7c478bd9Sstevel@tonic-gate #include "libc.h" 42*7c478bd9Sstevel@tonic-gate 43*7c478bd9Sstevel@tonic-gate /*VARARGS2*/ 44*7c478bd9Sstevel@tonic-gate int 45*7c478bd9Sstevel@tonic-gate snprintf(char *string, size_t n, const char *format, ...) 46*7c478bd9Sstevel@tonic-gate { 47*7c478bd9Sstevel@tonic-gate ssize_t count; 48*7c478bd9Sstevel@tonic-gate FILE siop; 49*7c478bd9Sstevel@tonic-gate va_list ap; 50*7c478bd9Sstevel@tonic-gate size_t max = MAXINT; 51*7c478bd9Sstevel@tonic-gate unsigned char tmpbuf[1]; /* dummy buffer for _doprnt() if NULL string */ 52*7c478bd9Sstevel@tonic-gate 53*7c478bd9Sstevel@tonic-gate siop._cnt = n - 1; 54*7c478bd9Sstevel@tonic-gate siop._base = siop._ptr = (unsigned char *)string; 55*7c478bd9Sstevel@tonic-gate siop._flag = _IOREAD; /* distinguish dummy file descriptor */ 56*7c478bd9Sstevel@tonic-gate #ifdef _LP64 57*7c478bd9Sstevel@tonic-gate /* 58*7c478bd9Sstevel@tonic-gate * _bufend() (_realbufend()) should return NULL for v/snprintf, 59*7c478bd9Sstevel@tonic-gate * so PUT() macro in _doprnt() will bounds check. For 32-bit, 60*7c478bd9Sstevel@tonic-gate * there is no _end field, and _realbufend() will return NULL 61*7c478bd9Sstevel@tonic-gate * since it cannot find the dummy FILE structure in the linked 62*7c478bd9Sstevel@tonic-gate * list of FILE strucutres. See bug 4274368. 63*7c478bd9Sstevel@tonic-gate */ 64*7c478bd9Sstevel@tonic-gate siop._end = NULL; 65*7c478bd9Sstevel@tonic-gate #endif /* _LP64 */ 66*7c478bd9Sstevel@tonic-gate 67*7c478bd9Sstevel@tonic-gate if (n == 0) { 68*7c478bd9Sstevel@tonic-gate /* 69*7c478bd9Sstevel@tonic-gate * When n==0, string may be NULL, so always use tmpbuf to 70*7c478bd9Sstevel@tonic-gate * guard for this case. No bytes should be transmitted to 71*7c478bd9Sstevel@tonic-gate * the buffer when n==0, so using tmpbuf instead of string 72*7c478bd9Sstevel@tonic-gate * (ie, if string is not NULL) should not matter. 73*7c478bd9Sstevel@tonic-gate */ 74*7c478bd9Sstevel@tonic-gate siop._base = siop._ptr = tmpbuf; 75*7c478bd9Sstevel@tonic-gate siop._cnt = 0; 76*7c478bd9Sstevel@tonic-gate } else if (n > max) { 77*7c478bd9Sstevel@tonic-gate errno = EOVERFLOW; 78*7c478bd9Sstevel@tonic-gate return (EOF); 79*7c478bd9Sstevel@tonic-gate } 80*7c478bd9Sstevel@tonic-gate 81*7c478bd9Sstevel@tonic-gate va_start(ap, format); 82*7c478bd9Sstevel@tonic-gate count = _ndoprnt(format, ap, &siop, 0); 83*7c478bd9Sstevel@tonic-gate va_end(ap); 84*7c478bd9Sstevel@tonic-gate 85*7c478bd9Sstevel@tonic-gate *siop._ptr = '\0'; /* plant terminating null character */ 86*7c478bd9Sstevel@tonic-gate 87*7c478bd9Sstevel@tonic-gate if (count == EOF) 88*7c478bd9Sstevel@tonic-gate return (EOF); 89*7c478bd9Sstevel@tonic-gate 90*7c478bd9Sstevel@tonic-gate /* overflow check */ 91*7c478bd9Sstevel@tonic-gate if ((size_t)count > max) { 92*7c478bd9Sstevel@tonic-gate errno = EOVERFLOW; 93*7c478bd9Sstevel@tonic-gate return (EOF); 94*7c478bd9Sstevel@tonic-gate } else { 95*7c478bd9Sstevel@tonic-gate return ((int)count); 96*7c478bd9Sstevel@tonic-gate } 97*7c478bd9Sstevel@tonic-gate } 98*7c478bd9Sstevel@tonic-gate 99*7c478bd9Sstevel@tonic-gate #ifndef _LP64 100*7c478bd9Sstevel@tonic-gate 101*7c478bd9Sstevel@tonic-gate /* 102*7c478bd9Sstevel@tonic-gate * 32-bit shadow function of snprintf(). 103*7c478bd9Sstevel@tonic-gate * When using the c89 compiler to build 32-bit applications, the size 104*7c478bd9Sstevel@tonic-gate * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits. 105*7c478bd9Sstevel@tonic-gate * The shadow function uses 32-bit size of intmax_t for %j conversion. 106*7c478bd9Sstevel@tonic-gate * The #pragma redefine_extname in <stdio.h> selects the proper routine 107*7c478bd9Sstevel@tonic-gate * at compile time for the user application. 108*7c478bd9Sstevel@tonic-gate * NOTE: this function is only available in the 32-bit library. 109*7c478bd9Sstevel@tonic-gate */ 110*7c478bd9Sstevel@tonic-gate 111*7c478bd9Sstevel@tonic-gate int 112*7c478bd9Sstevel@tonic-gate _snprintf_c89(char *string, size_t n, const char *format, ...) 113*7c478bd9Sstevel@tonic-gate { 114*7c478bd9Sstevel@tonic-gate ssize_t count; 115*7c478bd9Sstevel@tonic-gate va_list ap; 116*7c478bd9Sstevel@tonic-gate 117*7c478bd9Sstevel@tonic-gate va_start(ap, format); 118*7c478bd9Sstevel@tonic-gate count = _vsnprintf_c89(string, n, format, ap); 119*7c478bd9Sstevel@tonic-gate va_end(ap); 120*7c478bd9Sstevel@tonic-gate return ((int)count); 121*7c478bd9Sstevel@tonic-gate } 122*7c478bd9Sstevel@tonic-gate 123*7c478bd9Sstevel@tonic-gate #endif /* _LP64 */ 124