Annotation of prex/usr/lib/libc/time/asctime.c, Revision 1.1.1.1
1.1 nbrk 1: /*
2: * Copyright (c) 2007, Kohsuke Ohtani
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: #include <sys/param.h>
31: #include <time.h>
32:
33:
34: #ifndef TYPE_BIT
35: #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT)
36: #endif /* !defined TYPE_BIT */
37:
38: #ifndef TYPE_SIGNED
39: #define TYPE_SIGNED(type) (((type) -1) < 0)
40: #endif /* !defined TYPE_SIGNED */
41:
42: #ifndef INT_STRLEN_MAXIMUM
43: /*
44: ** 302 / 1000 is log10(2.0) rounded up.
45: ** Subtract one for the sign bit if the type is signed;
46: ** add one for integer division truncation;
47: ** add one more for a minus sign if the type is signed.
48: */
49: #define INT_STRLEN_MAXIMUM(type) \
50: ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type))
51: #endif /* !defined INT_STRLEN_MAXIMUM */
52:
53: /*
54: ** Big enough for something such as
55: ** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
56: ** (two three-character abbreviations, five strings denoting integers,
57: ** three explicit spaces, two explicit colons, a newline,
58: ** and a trailing ASCII nul).
59: */
60: #define ASCTIME_BUFLEN (3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) + 3 + 2 + 1 + 1)
61:
62: char *
63: asctime(timeptr)
64: register const struct tm * timeptr;
65: {
66: static char result[ASCTIME_BUFLEN];
67:
68: return asctime_r(timeptr, result);
69: }
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