/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
#include "lint.h"
#include <mtlib.h>
#include <stdarg.h>
#include <values.h>
#include <errno.h>
#include <synch.h>
#include <thread.h>
#include <sys/types.h>
#include "print.h"
#include "libc.h"
/*
* 32-bit shadow function _vsnprintf_c89() is included here.
* When using the c89 compiler to build 32-bit applications, the size
* of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
* The shadow function uses 32-bit size of intmax_t for j conversion.
* The #pragma redefine_extname in <stdio.h> selects the proper routine
* at compile time for the user application.
* NOTE: the shadow function only exists in the 32-bit library.
*/
/*VARARGS2*/
int
#ifdef _C89_INTMAX32 /* _C89_INTMAX32 version in 32-bit libc only */
_vsnprintf_c89(char *string, size_t n, const char *format, va_list ap)
#else
vsnprintf(char *string, size_t n, const char *format, va_list ap)
#endif
{
ssize_t count;
FILE siop;
size_t max = MAXINT;
unsigned char tmpbuf[1]; /* dummy buffer for _doprnt() if NULL string */
siop._cnt = n - 1;
siop._base = siop._ptr = (unsigned char *)string;
siop._flag = _IOREAD; /* distinguish dummy file descriptor */
#ifdef _LP64
/*
* _bufend() (_realbufend()) should return NULL for v/snprintf,
* so PUT() macro in _doprnt() will bounds check. For 32-bit,
* there is no _end field, and _realbufend() will return NULL
* since it cannot find the dummy FILE structure in the linked
* list of FILE strucutres. See bug 4274368.
*/
siop._end = NULL;
#endif /* _LP64 */
if (n == 0) {
/*
* When n==0, string may be NULL, so always use tmpbuf to
* guard for this case. No bytes should be transmitted to
* the buffer when n==0, so using tmpbuf instead of string
* (ie, if string is not NULL) should not matter.
*/
siop._base = siop._ptr = tmpbuf;
siop._cnt = 0;
} else if (n > max) {
errno = EOVERFLOW;
return (EOF);
}
#ifdef _C89_INTMAX32
count = _ndoprnt(format, ap, &siop, _F_INTMAX32);
#else
count = _ndoprnt(format, ap, &siop, 0);
#endif /* _C89_INTMAX32 */
*siop._ptr = '\0'; /* plant terminating null character */
/* overflow check */
if ((size_t)count > max) {
errno = EOVERFLOW;
return (EOF);
} else {
return ((int)count);
}
}