| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame] | 1 | /** @file
|
| 2 | Implementation of internal snprintf function for <stdio.h>.
|
| 3 |
|
| 4 | Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
|
| 5 | This program and the accompanying materials are licensed and made available
|
| 6 | under the terms and conditions of the BSD License that accompanies this
|
| 7 | distribution. The full text of the license may be found at
|
| 8 | http://opensource.org/licenses/bsd-license.php.
|
| 9 |
|
| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
| 12 |
|
| 13 | Copyright (c) 1990, 1993
|
| 14 | The Regents of the University of California. All rights reserved.
|
| 15 |
|
| 16 | This code is derived from software contributed to Berkeley by
|
| 17 | Chris Torek.
|
| 18 |
|
| 19 | Redistribution and use in source and binary forms, with or without
|
| 20 | modification, are permitted provided that the following conditions
|
| 21 | are met:
|
| 22 | - Redistributions of source code must retain the above copyright
|
| 23 | notice, this list of conditions and the following disclaimer.
|
| 24 | - Redistributions in binary form must reproduce the above copyright
|
| 25 | notice, this list of conditions and the following disclaimer in the
|
| 26 | documentation and/or other materials provided with the distribution.
|
| 27 | - Neither the name of the University nor the names of its contributors
|
| 28 | may be used to endorse or promote products derived from this software
|
| 29 | without specific prior written permission.
|
| 30 |
|
| 31 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
| 32 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
| 33 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
| 34 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
|
| 35 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
| 36 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
| 37 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
| 38 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
| 39 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
| 40 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
| 41 | POSSIBILITY OF SUCH DAMAGE.
|
| 42 |
|
| 43 | NetBSD: snprintf.c,v 1.20 2005/02/09 21:35:47 kleink Exp
|
| 44 | snprintf.c 8.1 (Berkeley) 6/4/93
|
| 45 | **/
|
| 46 | #include <LibConfig.h>
|
| 47 |
|
| 48 | #include "namespace.h"
|
| 49 |
|
| 50 | #include <assert.h>
|
| 51 | #include <errno.h>
|
| 52 | #include <stdarg.h>
|
| 53 | #include <stdio.h>
|
| 54 |
|
| 55 | #include "reentrant.h"
|
| 56 | #include "local.h"
|
| 57 |
|
| 58 | #ifdef __weak_alias
|
| 59 | __weak_alias(snprintf,_snprintf)
|
| 60 | #endif
|
| 61 |
|
| 62 | int
|
| 63 | snprintf(char *str, size_t n, char const *fmt, ...)
|
| 64 | {
|
| 65 | int ret;
|
| 66 | va_list ap;
|
| 67 | FILE f;
|
| 68 | struct __sfileext fext;
|
| 69 | unsigned char dummy[1];
|
| 70 |
|
| 71 | _DIAGASSERT(n == 0 || str != NULL);
|
| 72 | _DIAGASSERT(fmt != NULL);
|
| 73 |
|
| 74 | if ((int)n < 0) {
|
| 75 | errno = EINVAL;
|
| 76 | return (-1);
|
| 77 | }
|
| 78 | va_start(ap, fmt);
|
| 79 | _FILEEXT_SETUP(&f, &fext);
|
| 80 | f._file = -1;
|
| 81 | f._flags = __SWR | __SSTR;
|
| 82 | if (n == 0) {
|
| 83 | f._bf._base = f._p = dummy;
|
| 84 | f._bf._size = f._w = 0;
|
| 85 | } else {
|
| 86 | f._bf._base = f._p = (unsigned char *)str;
|
| 87 | f._bf._size = f._w = (int)(n - 1);
|
| 88 | }
|
| 89 | ret = __vfprintf_unlocked(&f, fmt, ap);
|
| 90 | *f._p = 0;
|
| 91 | va_end(ap);
|
| 92 | return (ret);
|
| 93 | }
|