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getsubopt.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                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
/*
 * Xopen 4.2 compatibility
 */

#include <ast_lib.h>

#if _lib_getsubopt

#include <ast.h>

NoN(getsubopt)

#else

#define getsubopt ______getsubopt

#include <ast.h>

#undef      getsubopt

#include <error.h>

#if defined(__EXPORT__)
#define extern    __EXPORT__
#endif

extern int
getsubopt(register char** op, char* const* tp, char** vp)
{
      register char*    b;
      register char*    s;
      register char*    v;

      if (*(b = *op))
      {
            v = 0;
            s = b;
            for (;;)
            {
                  switch (*s++)
                  {
                  case 0:
                        s--;
                        break;
                  case ',':
                        *(s - 1) = 0;
                        break;
                  case '=':
                        if (!v)
                        {
                              *(s - 1) = 0;
                              v = s;
                        }
                        continue;
                  default:
                        continue;
                  }
                  break;
            }
            *op = s;
            *vp = v;
            for (op = (char**)tp; *op; op++)
                  if (streq(b, *op))
                        return op - (char**)tp;
      }
      *vp = b;
      return -1;
}

#endif

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