root / prex-0.9.0 / usr / lib / libc / time / asctime.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2007, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <sys/param.h> |
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31 | #include <time.h> |
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32 | |||
33 | |||
34 | #ifndef TYPE_BIT
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35 | #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) |
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36 | #endif /* !defined TYPE_BIT */ |
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37 | |||
38 | #ifndef TYPE_SIGNED
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39 | #define TYPE_SIGNED(type) (((type) -1) < 0) |
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40 | #endif /* !defined TYPE_SIGNED */ |
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41 | |||
42 | #ifndef INT_STRLEN_MAXIMUM
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43 | /*
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44 | ** 302 / 1000 is log10(2.0) rounded up.
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45 | ** Subtract one for the sign bit if the type is signed;
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46 | ** add one for integer division truncation;
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47 | ** add one more for a minus sign if the type is signed.
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48 | */
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49 | #define INT_STRLEN_MAXIMUM(type) \
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50 | ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type)) |
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51 | #endif /* !defined INT_STRLEN_MAXIMUM */ |
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52 | |||
53 | #define ASCTIME_BUFLEN (3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) + 3 + 2 + 1 + 1) |
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54 | |||
55 | char *
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56 | asctime(timeptr) |
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57 | register const struct tm * timeptr; |
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58 | { |
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59 | static char result[ASCTIME_BUFLEN]; |
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60 | |||
61 | return asctime_r(timeptr, result);
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62 | } |