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tmgoff.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 Bell Laboratories
 *
 * time conversion support
 */

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

/*
 * return minutes offset from absolute timezone expression
 *
 *    [[-+]hh[:mm[:ss]]]
 *    [-+]hhmm
 *
 * if e is non-null then it points to the first unrecognized char in s
 * d returned if no offset in s
 */

int
tmgoff(register const char* s, char** e, int d)
{
      register int      n = d;
      int         east;
      const char* t = s;

      if ((east = *s == '+') || *s == '-')
      {
            s++;
            if (isdigit(*s) && isdigit(*(s + 1)))
            {
                  n = ((*s - '0') * 10 + (*(s + 1) - '0')) * 60;
                  s += 2;
                  if (*s == ':')
                        s++;
                  if (isdigit(*s) && isdigit(*(s + 1)))
                  {
                        n += ((*s - '0') * 10 + (*(s + 1) - '0'));
                        s += 2;
                        if (*s == ':')
                              s++;
                        if (isdigit(*s) && isdigit(*(s + 1)))
                              s += 2;
                  }
                  if (east)
                        n = -n;
                  t = s;
            }
      }
      if (e)
            *e = (char*)t;
      return n;
}

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