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tmlex.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                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 the tab table index that matches s ignoring case and .'s
 * tm_data.format checked if tminfo.format!=tm_data.format
 *
 * ntab and nsuf are the number of elements in tab and suf,
 * -1 for 0 sentinel
 *
 * all isalpha() chars in str must match
 * suf is a table of nsuf valid str suffixes 
 * if e is non-null then it will point to first unmatched char in str
 * which will always be non-isalpha()
 */

int
tmlex(register const char* s, char** e, char** tab, int ntab, char** suf, int nsuf)
{
      register char**   p;
      register char*    x;
      register int      n;

      for (p = tab, n = ntab; n-- && (x = *p); p++)
            if (*x && *x != '%' && tmword(s, e, x, suf, nsuf))
                  return p - tab;
      if (tm_info.format != tm_data.format && tab >= tm_info.format && tab < tm_info.format + TM_NFORM)
      {
            tab = tm_data.format + (tab - tm_info.format);
            if (suf && tab >= tm_info.format && tab < tm_info.format + TM_NFORM)
                  suf = tm_data.format + (suf - tm_info.format);
            for (p = tab, n = ntab; n-- && (x = *p); p++)
                  if (*x && *x != '%' && tmword(s, e, x, suf, nsuf))
                        return p - tab;
      }
      return -1;
}

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