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root/usr/lib/libc/time/asctime.c

DEFINITIONS

1. asctime

   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  */
  30 #include <sys/param.h>
  31 #include <time.h>
  34 #ifndef TYPE_BIT
  35 #define TYPE_BIT(type)  (sizeof (type) * CHAR_BIT)
  36 #endif /* !defined TYPE_BIT */
  38 #ifndef TYPE_SIGNED
  39 #define TYPE_SIGNED(type) (((type) -1) < 0)
  40 #endif /* !defined TYPE_SIGNED */
  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 */
  53 #define ASCTIME_BUFLEN  (3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) + 3 + 2 + 1 + 1)
  55 char *
asctime(timeptr)
  57 register const struct tm *      timeptr;
  58 {
  59         static char result[ASCTIME_BUFLEN];
  61         return asctime_r(timeptr, result);
  62 }