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| 1 | +/*- |
| 2 | + * Copyright (c) 1990, 1993 |
| 3 | + * The Regents of the University of California. All rights reserved. |
| 4 | + * |
| 5 | + * This code is derived from software contributed to Berkeley by |
| 6 | + * Chris Torek. |
| 7 | + * |
| 8 | + * Redistribution and use in source and binary forms, with or without |
| 9 | + * modification, are permitted provided that the following conditions |
| 10 | + * are met: |
| 11 | + * 1. Redistributions of source code must retain the above copyright |
| 12 | + * notice, this list of conditions and the following disclaimer. |
| 13 | + * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | + * notice, this list of conditions and the following disclaimer in the |
| 15 | + * documentation and/or other materials provided with the distribution. |
| 16 | + * 3. All advertising materials mentioning features or use of this software |
| 17 | + * must display the following acknowledgement: |
| 18 | + * This product includes software developed by the University of |
| 19 | + * California, Berkeley and its contributors. |
| 20 | + * 4. Neither the name of the University nor the names of its contributors |
| 21 | + * may be used to endorse or promote products derived from this software |
| 22 | + * without specific prior written permission. |
| 23 | + * |
| 24 | + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 25 | + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 28 | + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 29 | + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 30 | + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 31 | + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 32 | + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 33 | + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | + * SUCH DAMAGE. |
| 35 | + */ |
| 36 | + |
| 37 | +#if defined(LIBC_SCCS) && !defined(lint) |
| 38 | +#if 0 |
| 39 | +static char sccsid[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93"; |
| 40 | +#endif |
| 41 | +static const char rcsid[] = |
| 42 | + "$Id: snprintf.c,v 1.1 1998/08/01 19:30:28 scrappy Exp $"; |
| 43 | +#endif /* LIBC_SCCS and not lint */ |
| 44 | + |
| 45 | +#include <limits.h> |
| 46 | +#include <stdio.h> |
| 47 | +#if __STDC__ |
| 48 | +#include <stdarg.h> |
| 49 | +#else |
| 50 | +#include <varargs.h> |
| 51 | +#endif |
| 52 | + |
| 53 | +#if __STDC__ |
| 54 | +int |
| 55 | +snprintf(char *str, size_t n, char const *fmt, ...) |
| 56 | +#else |
| 57 | +int |
| 58 | +snprintf(str, n, fmt, va_alist) |
| 59 | + char *str; |
| 60 | + size_t n; |
| 61 | + char *fmt; |
| 62 | + va_dcl |
| 63 | +#endif |
| 64 | +{ |
| 65 | + size_t on; |
| 66 | + int ret; |
| 67 | + va_list ap; |
| 68 | + FILE f; |
| 69 | + |
| 70 | + on = n; |
| 71 | + if (n != 0) |
| 72 | + n--; |
| 73 | + if (n > INT_MAX) |
| 74 | + n = INT_MAX; |
| 75 | +#if __STDC__ |
| 76 | + va_start(ap, fmt); |
| 77 | +#else |
| 78 | + va_start(ap); |
| 79 | +#endif |
| 80 | + f._file = -1; |
| 81 | + f._flags = __SWR | __SSTR; |
| 82 | + f._bf._base = f._p = (unsigned char *)str; |
| 83 | + f._bf._size = f._w = n; |
| 84 | + ret = vfprintf(&f, fmt, ap); |
| 85 | + if (on > 0) |
| 86 | + *f._p = '\0'; |
| 87 | + va_end(ap); |
| 88 | + return (ret); |
| 89 | +} |
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