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tmzone.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2007 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Research
 *
 * time conversion support
 */

#include <ast.h>
#include <tm.h>

/*
 * return timezone pointer given name and type
 *
 * if type==0 then all time zone types match
 * otherwise type must be one of tm_info.zone[].type
 *
 * if end is non-null then it will point to the next
 * unmatched char in name
 *
 * if dst!=0 then it will point to 0 for standard zones
 * and the offset for daylight zones
 *
 * 0 returned for no match
 */

Tm_zone_t*
tmzone(register const char* name, char** end, const char* type, int* dst)
{
      register Tm_zone_t*     zp;
      register char*          prev;
      char*             e;

      static Tm_zone_t  fixed;
      static char       off[16];

      tmset(tm_info.zone);
      if ((*name == '+' || *name == '-') && (fixed.west = tmgoff(name, &e, TM_LOCALZONE)) != TM_LOCALZONE && !*e)
      {
            fixed.standard = fixed.daylight = strncpy(off, name, sizeof(off) - 1);
            if (end)
                  *end = e;
            if (dst)
                  *dst = 0;
            return &fixed;
      }
      zp = tm_info.local;
      prev = 0;
      do
      {
            if (zp->type)
                  prev = zp->type;
            if (!type || type == prev || !prev)
            {
                  if (tmword(name, end, zp->standard, NiL, 0))
                  {
                        if (dst)
                              *dst = 0;
                        return zp;
                  }
                  if (zp->dst && zp->daylight && tmword(name, end, zp->daylight, NiL, 0))
                  {
                        if (dst)
                              *dst = zp->dst;
                        return zp;
                  }
            }
            if (zp == tm_info.local)
                  zp = tm_data.zone;
            else
                  zp++;
      } while (zp->standard);
      return 0;
}

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