diff options
| author | christos <christos@NetBSD.org> | 2006-10-27 19:59:58 +0000 |
|---|---|---|
| committer | christos <christos@NetBSD.org> | 2006-10-27 19:59:58 +0000 |
| commit | abca035cf37bdc610cd36b5d7e4d1abb347d4402 (patch) | |
| tree | 7407e14c54b8ed27955542a5bc90513c28a548ee /lib/libc/stdio/snprintf_ss.c | |
| parent | eb6da7fc35bd03da95bb4848f71cb5afc14dbbca (diff) | |
Add signal-safe versions of snprintf and vsnprintf
Diffstat (limited to 'lib/libc/stdio/snprintf_ss.c')
| -rw-r--r-- | lib/libc/stdio/snprintf_ss.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/lib/libc/stdio/snprintf_ss.c b/lib/libc/stdio/snprintf_ss.c new file mode 100644 index 00000000000..bf7630e4a92 --- /dev/null +++ b/lib/libc/stdio/snprintf_ss.c @@ -0,0 +1,89 @@ +/* $NetBSD: snprintf_ss.c,v 1.1 2006/10/27 19:59:58 christos Exp $ */ + +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +#if defined(LIBC_SCCS) && !defined(lint) +#if 0 +static char sccsid[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93"; +#else +__RCSID("$NetBSD: snprintf_ss.c,v 1.1 2006/10/27 19:59:58 christos Exp $"); +#endif +#endif /* LIBC_SCCS and not lint */ + +#include "namespace.h" + +#include <assert.h> +#include <errno.h> +#include <stdarg.h> +#include <stdio.h> + +#include "reentrant.h" +#include "local.h" + +#ifdef __weak_alias +__weak_alias(snprintf,_snprintf) +#endif + +int +snprintf_ss(char *str, size_t n, char const *fmt, ...) +{ + int ret; + va_list ap; + FILE f; + struct __sfileext fext; + unsigned char dummy[1]; + + _DIAGASSERT(n == 0 || str != NULL); + _DIAGASSERT(fmt != NULL); + + if ((int)n < 0) { + errno = EINVAL; + return (-1); + } + va_start(ap, fmt); + _FILEEXT_SETUP(&f, &fext); + f._file = -1; + f._flags = __SWR | __SSTR | __SAFE; + if (n == 0) { + f._bf._base = f._p = dummy; + f._bf._size = f._w = 0; + } else { + f._bf._base = f._p = (unsigned char *)str; + f._bf._size = f._w = n - 1; + } + ret = __vfprintf_unlocked(&f, fmt, ap); + *f._p = 0; + va_end(ap); + return (ret); +} |
