usr/src/lib/libast/common/tm/tmzone.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23 /*
  24  * Glenn Fowler
  25  * AT&T Research
  26  *
  27  * time conversion support
  28  */
  29
  30 #include <ast.h>
  31 #include <tm.h>
  32
  33 /*
  34  * return timezone pointer given name and type
  35  *
  36  * if type==0 then all time zone types match
  37  * otherwise type must be one of tm_info.zone[].type
  38  *
  39  * if end is non-null then it will point to the next
  40  * unmatched char in name
  41  *
  42  * if dst!=0 then it will point to 0 for standard zones
  43  * and the offset for daylight zones
  44  *
  45  * 0 returned for no match
  46  */
  47
  48 Tm_zone_t*
  49 tmzone(register const char* name, char** end, const char* type, int* dst)
  50 {
  51         register Tm_zone_t*     zp;
  52         register char*          prev;
  53         char*                   e;
  54
  55         static Tm_zone_t        fixed;
  56         static char             off[16];
  57
  58         tmset(tm_info.zone);
  59         if ((*name == '+' || *name == '-') && (fixed.west = tmgoff(name, &e, TM_LOCALZONE)) != TM_LOCALZONE && !*e)
  60         {
  61                 fixed.standard = fixed.daylight = strncpy(off, name, sizeof(off) - 1);
  62                 if (end)
  63                         *end = e;
  64                 if (dst)
  65                         *dst = 0;
  66                 return &fixed;
  67         }
  68         zp = tm_info.local;
  69         prev = 0;
  70         do
  71         {
  72                 if (zp->type)
  73                         prev = zp->type;
  74                 if (!type || type == prev || !prev)
  75                 {
  76                         if (tmword(name, end, zp->standard, NiL, 0))
  77                         {
  78                                 if (dst)
  79                                         *dst = 0;
  80                                 return zp;
  81                         }
  82                         if (zp->dst && zp->daylight && tmword(name, end, zp->daylight, NiL, 0))
  83                         {
  84                                 if (dst)
  85                                         *dst = zp->dst;
  86                                 return zp;
  87                         }
  88                 }
  89                 if (zp == tm_info.local)
  90                         zp = tm_data.zone;
  91                 else
  92                         zp++;
  93         } while (zp->standard);
  94         return 0;
  95 }