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getoptl.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

#include <ast.h>

#undef      _BLD_ast    /* enable ast imports since we're user static */

#include <error.h>
#include <option.h>
#include <getopt.h>
#include <ctype.h>

static const char*            lastoptstring;
static const struct option*   lastlongopts;
static char*                  usage;
static Sfio_t*                up;

static int              lastoptind;

static int
golly(int argc, char* const* argv, const char* optstring, const struct option* longopts, int* longindex, int flags)
{
      register char*                s;
      register const struct option* o;
      register int                  c;
      char*                   t;

      if (!up || optstring != lastoptstring || longopts != lastlongopts)
      {
            if (!up && !(up = sfstropen()))
                  return -1;
            sfprintf(up, "[-1p%d]", flags);
            t = strdup(optstring);
            for (o = longopts; o->name; o++)
            {
                  if (o->flag || o->val <= 0 || o->val > UCHAR_MAX || !isalnum(o->val))
                        sfprintf(up, "\n[%d:%s]", UCHAR_MAX + 1 + (o - longopts), o->name);
                  else
                  {
                        sfprintf(up, "\n[%c:%s]", o->val, o->name);
                        if (s = strchr(t, o->val))
                        {
                              *s++ = ' ';
                              if (*s == ':')
                              {
                                    *s++ = ' ';
                                    if (*s == ':')
                                          *s = ' ';
                              }
                        }
                  }
                  if (o->has_arg)
                  {
                        sfputc(up, ':');
                        if (o->has_arg == optional_argument)
                              sfputc(up, '?');
                        sfprintf(up, "[string]");
                  }
            }
            s = t;
            while (c = *s++)
                  if (c != ' ')
                  {
                        sfprintf(up, "\n[%c]", c);
                        if (*s == ':')
                        {
                              sfputc(up, *s);
                              if (*++s == ':')
                              {
                                    sfputc(up, '?');
                                    s++;
                              }
                              sfputc(up, '[');
                              sfputc(up, ']');
                        }
                  }
            sfputc(up, '\n');
            usage = sfstruse(up);
            lastoptstring = optstring;
            lastlongopts = longopts;
      }
      opt_info.index = (optind > 1 || optind == lastoptind) ? optind : 0;
      if (opt_info.index >= argc || !(c = optget((char**)argv, usage)))
      {
            sfstrclose(up);
            up = 0;
            c = -1;
      }
      else
      {
            if (c == ':' || c == '?')
            {
                  if (opterr && (!optstring || *optstring != ':'))
                  {
                        if (!error_info.id)
                              error_info.id = argv[0];
                        errormsg(NiL, c == '?' ? (ERROR_USAGE|4) : 2, "%s", opt_info.arg);
                  }
                  optopt = opt_info.option[1];
                  c = '?';
            }
            optarg = opt_info.arg;
            if (c < 0)
            {
                  o = longopts - c - UCHAR_MAX - 1;
                  if (o->flag)
                  {
                        *o->flag = o->val;
                        c = 0;
                  }
                  else
                        c = o->val;
            }
      }
      lastoptind = optind = opt_info.index;
      return c;
}

extern int
getopt_long(int argc, char* const* argv, const char* optstring, const struct option* longopts, int* longindex)
{
      return golly(argc, argv, optstring, longopts, longindex, 2);
}

extern int
getopt_long_only(int argc, char* const* argv, const char* optstring, const struct option* longopts, int* longindex)
{
      return golly(argc, argv, optstring, longopts, longindex, 1);
}

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