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optjoin.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2010 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
 *
 * multi-pass commmand line option parse assist
 *
 *    int fun(char** argv, int last)
 *
 * each fun() argument parses as much of argv as
 * possible starting at (opt_info.index,opt_info.offset) using
 * optget()
 *
 * if last!=0 then fun is the last pass to view
 * the current arg, otherwise fun sets opt_info.again=1
 * and another pass will get a crack at it
 *
 * 0 fun() return causes immediate optjoin() 0 return
 *
 * optjoin() returns non-zero if more args remain
 * to be parsed at opt_info.index
 */

#include <optlib.h>

typedef int (*Optpass_f)(char**, int);

int
optjoin(char** argv, ...)
{
      va_list                 ap;
      register Optpass_f      fun;
      register Optpass_f      rep;
      Optpass_f         err;
      Optstate_t*       state;
      int               more;
      int               user;
      int               last_index;
      int               last_offset;
      int               err_index;
      int               err_offset;

      state = optstate(&opt_info);
      err = rep = 0;
      for (;;)
      {
            va_start(ap, argv);
            state->join = 0;
            while (fun = va_arg(ap, Optpass_f))
            {
                  last_index = opt_info.index;
                  last_offset = opt_info.offset;
                  state->join++;
                  user = (*fun)(argv, 0);
                  more = argv[opt_info.index] != 0;
                  if (!opt_info.again)
                  {
                        if (!more)
                        {
                              state->join = 0;
                              return 0;
                        }
                        if (!user)
                        {
                              if (*argv[opt_info.index] != '+')
                              {
                                    state->join = 0;
                                    return 1;
                              }
                              opt_info.again = -1;
                        }
                        else
                              err = 0;
                  }
                  if (opt_info.again)
                  {
                        if (opt_info.again > 0 && (!err || err_index < opt_info.index || err_index == opt_info.index && err_offset < opt_info.offset))
                        {
                              err = fun;
                              err_index = opt_info.index;
                              err_offset = opt_info.offset;
                        }
                        opt_info.again = 0;
                        opt_info.index = state->pindex ? state->pindex : 1;
                        opt_info.offset = state->poffset;
                  }
                  if (!rep || opt_info.index != last_index || opt_info.offset != last_offset)
                        rep = fun;
                  else if (fun == rep)
                  {
                        if (!err)
                        {
                              state->join = 0;
                              return 1;
                        }
                        (*err)(argv, 1);
                        opt_info.offset = 0;
                  }
            }
            va_end(ap);
      }
}

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