cubrid_getopt_long.c

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/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Dieter Baron and Thomas Klausner.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <assert.h>
#include "config.h"

#ifndef HAVE_GETOPT_LONG
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cubrid_getopt.h"

#define REPLACE_GETOPT

#ifndef _DIAGASSERT
#define _DIAGASSERT(e)
#endif

#ifdef REPLACE_GETOPT
#ifdef __weak_alias
__weak_alias (getopt, _getopt)
#endif
     int opterr = 1;        /* if error message should be printed */
     int optind = 1;        /* index into parent argv vector */
     int optopt = '?';      /* character checked for validity */
     int optreset;      /* reset getopt */
     char *optarg = NULL;   /* argument associated with option */
#endif

#ifdef __weak_alias
__weak_alias (getopt_long, _getopt_long)
#endif
#define IGNORE_FIRST    (*options == '-' || *options == '+')
#define PRINT_ERROR ((opterr) && ((*options != ':') \
                      || (IGNORE_FIRST && options[1] != ':')))
#define IS_POSIXLY_CORRECT (getenv("POSIXLY_CORRECT") != NULL)
#define PERMUTE         (!IS_POSIXLY_CORRECT && !IGNORE_FIRST)
/* XXX: GNU ignores PC if *options == '-' */
#define IN_ORDER        (!IS_POSIXLY_CORRECT && *options == '-')
/* return values */
#define BADCH   (int)'?'
#define BADARG  (int)':'
#define INORDER (int)1
#define EMSG    ""
     static int getopt_internal (int, char *const *, const char *);
     static int gcd (int, int);
     static void permute_args (int, int, int, char *const *);
     static void xwarnx (const char *, ...);

     static char *place = EMSG; /* option letter processing */

/* XXX: set optreset to 1 rather than these two */
     static int nonopt_start = -1;  /* first non option argument (for permute) */
     static int nonopt_end = -1;    /* first option after non options (for permute) */

/* Error messages */
     static const char recargchar[] = "option requires an argument -- %c";
     static const char recargstring[] = "option requires an argument -- %s";
     static const char ambig[] = "ambiguous option -- %.*s";
     static const char noarg[] = "option doesn't take an argument -- %.*s";
     static const char illoptchar[] = "illegal option -- %c";
     static const char illoptstring[] = "illegal option -- %s";

     static const char *progname;


/* Replacement for warnx(3) for systems without it. */
     static void xwarnx (const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);
  if (progname)
    (void) fprintf (stderr, "%s: ", progname);
  if (fmt)
    (void) vfprintf (stderr, fmt, ap);
  (void) fprintf (stderr, "\n");
  va_end (ap);
}

/*
 * Compute the greatest common divisor of a and b.
 */
static int
gcd (int a, int b)
{
  int c;

  c = a % b;
  while (c != 0)
    {
      a = b;
      b = c;
      c = a % b;
    }

  return b;
}

/*
 * Exchange the block from nonopt_start to nonopt_end with the block
 * from nonopt_end to opt_end (keeping the same order of arguments
 * in each block).
 */
static void
permute_args (int nonopt_start, int nonopt_end, int opt_end, char *const *nargv)
{
  int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
  char *swap;

  /*
   * compute lengths of blocks and number and size of cycles
   */
  nnonopts = nonopt_end - nonopt_start;
  nopts = opt_end - nonopt_end;
  ncycle = gcd (nnonopts, nopts);
  cyclelen = (opt_end - nonopt_start) / ncycle;

  for (i = 0; i < ncycle; i++)
    {
      cstart = nonopt_end + i;
      pos = cstart;
      for (j = 0; j < cyclelen; j++)
    {
      if (pos >= nonopt_end)
        pos -= nnonopts;
      else
        pos += nopts;
      swap = nargv[pos];
      /* LINTED const cast */
      ((char **) nargv)[pos] = nargv[cstart];
      /* LINTED const cast */
      ((char **) nargv)[cstart] = swap;
    }
    }
}

/*
 * getopt_internal --
 *  Parse argc/argv argument vector.  Called by user level routines.
 *  Returns -2 if -- is found (can be long option or end of options marker).
 */
static int
getopt_internal (int nargc, char *const *nargv, const char *options)
{
  char *oli;            /* option letter list index */
  int optchar;

  _DIAGASSERT (nargv != NULL);
  _DIAGASSERT (options != NULL);

  optarg = NULL;

  /*
   * XXX Some programs (like rsyncd) expect to be able to
   * XXX re-initialize optind to 0 and have getopt_long(3)
   * XXX properly function again.  Work around this braindamage.
   */
  if (optind == 0)
    optind = 1;

  if (optreset)
    nonopt_start = nonopt_end = -1;
start:
  if (optreset || !*place)
    {               /* update scanning pointer */
      optreset = 0;
      if (optind >= nargc)
    {           /* end of argument vector */
      place = EMSG;
      if (nonopt_end != -1)
        {
          /* do permutation, if we have to */
          permute_args (nonopt_start, nonopt_end, optind, nargv);
          optind -= nonopt_end - nonopt_start;
        }
      else if (nonopt_start != -1)
        {
          /*
           * If we skipped non-options, set optind
           * to the first of them.
           */
          optind = nonopt_start;
        }
      nonopt_start = nonopt_end = -1;
      return -1;
    }
      if (*(place = nargv[optind]) != '-')
    {           /* found non-option */
      place = EMSG;
      if (IN_ORDER)
        {
          /*
           * GNU extension:
           * return non-option as argument to option 1
           */
          optarg = nargv[optind++];
          return INORDER;
        }
      if (!PERMUTE)
        {
          /*
           * if no permutation wanted, stop parsing
           * at first non-option
           */
          return -1;
        }
      /* do permutation */
      if (nonopt_start == -1)
        nonopt_start = optind;
      else if (nonopt_end != -1)
        {
          permute_args (nonopt_start, nonopt_end, optind, nargv);
          nonopt_start = optind - (nonopt_end - nonopt_start);
          nonopt_end = -1;
        }
      optind++;
      /* process next argument */
      goto start;
    }
      if (nonopt_start != -1 && nonopt_end == -1)
    nonopt_end = optind;
      if (place[1] && *++place == '-')
    {           /* found "--" */
      place++;
      return -2;
    }
    }
  if ((optchar = (int) *place++) == (int) ':' || (oli = (char *) strchr (options + (IGNORE_FIRST ? 1 : 0), optchar))
      == NULL)
    {
      /* option letter unknown or ':' */
      if (!*place)
    ++optind;
      if (PRINT_ERROR)
    xwarnx (illoptchar, optchar);
      optopt = optchar;
      return BADCH;
    }
  if (optchar == 'W' && oli[1] == ';')
    {               /* -W long-option */
      /* XXX: what if no long options provided (called by getopt)? */
      if (*place)
    return -2;

      if (++optind >= nargc)
    {           /* no arg */
      place = EMSG;
      if (PRINT_ERROR)
        xwarnx (recargchar, optchar);
      optopt = optchar;
      /* XXX: GNU returns '?' if options[0] != ':' */
      return BADARG;
    }
      else          /* white space */
    place = nargv[optind];
      /*
       * Handle -W arg the same as --arg (which causes getopt to
       * stop parsing).
       */
      return -2;
    }
  if (*++oli != ':')
    {               /* doesn't take argument */
      if (!*place)
    ++optind;
    }
  else
    {               /* takes (optional) argument */
      optarg = NULL;
      if (*place)       /* no white space */
    optarg = place;
      /* XXX: disable test for :: if PC? (GNU doesn't) */
      else if (oli[1] != ':')
    {           /* arg not optional */
      if (++optind >= nargc)
        {           /* no arg */
          place = EMSG;
          if (PRINT_ERROR)
        xwarnx (recargchar, optchar);
          optopt = optchar;
          /* XXX: GNU returns '?' if options[0] != ':' */
          return BADARG;
        }
      else
        optarg = nargv[optind];
    }
      place = EMSG;
      ++optind;
    }
  /* dump back option letter */
  return optchar;
}

#ifdef REPLACE_GETOPT
/*
 * getopt --
 *  Parse argc/argv argument vector.
 *
 * [eventually this will replace the real getopt]
 */
int
getopt (int nargc, char *const *nargv, const char *options)
{
  int retval;

  progname = nargv[0];

  if ((retval = getopt_internal (nargc, nargv, options)) == -2)
    {
      ++optind;
      /*
       * We found an option (--), so if we skipped non-options,
       * we have to permute.
       */
      if (nonopt_end != -1)
    {
      permute_args (nonopt_start, nonopt_end, optind, nargv);
      optind -= nonopt_end - nonopt_start;
    }
      nonopt_start = nonopt_end = -1;
      retval = -1;
    }
  return retval;
}
#endif

/*
 * getopt_long --
 *  Parse argc/argv argument vector.
 */
int
getopt_long (int nargc, char *const *nargv, const char *options, const struct option *long_options, int *idx)
{
  int retval;

  _DIAGASSERT (nargv != NULL);
  _DIAGASSERT (options != NULL);
  _DIAGASSERT (long_options != NULL);
  /* idx may be NULL */

  progname = nargv[0];

  if ((retval = getopt_internal (nargc, nargv, options)) == -2)
    {
      char *current_argv, *has_equal;
      size_t current_argv_len;
      int i, match;

      current_argv = place;
      match = -1;

      optind++;
      place = EMSG;

      if (*current_argv == '\0')
    {           /* found "--" */
      /*
       * We found an option (--), so if we skipped
       * non-options, we have to permute.
       */
      if (nonopt_end != -1)
        {
          permute_args (nonopt_start, nonopt_end, optind, nargv);
          optind -= nonopt_end - nonopt_start;
        }
      nonopt_start = nonopt_end = -1;
      return -1;
    }
      if ((has_equal = strchr (current_argv, '=')) != NULL)
    {
      /* argument found (--option=arg) */
      current_argv_len = has_equal - current_argv;
      has_equal++;
    }
      else
    current_argv_len = strlen (current_argv);

      for (i = 0; long_options[i].name; i++)
    {
      /* find matching long option */
      if (strncmp (current_argv, long_options[i].name, current_argv_len))
        continue;

      if (strlen (long_options[i].name) == (unsigned) current_argv_len)
        {
          /* exact match */
          match = i;
          break;
        }
      if (match == -1)  /* partial match */
        match = i;
      else
        {
          /* ambiguous abbreviation */
          if (PRINT_ERROR)
        xwarnx (ambig, (int) current_argv_len, current_argv);
          optopt = 0;
          return BADCH;
        }
    }
      if (match != -1)
    {           /* option found */
      if (long_options[match].has_arg == no_argument && has_equal)
        {
          if (PRINT_ERROR)
        xwarnx (noarg, (int) current_argv_len, current_argv);
          /*
           * XXX: GNU sets optopt to val regardless of
           * flag
           */
          if (long_options[match].flag == NULL)
        optopt = long_options[match].val;
          else
        optopt = 0;
          /* XXX: GNU returns '?' if options[0] != ':' */
          return BADARG;
        }
      if (long_options[match].has_arg == required_argument || long_options[match].has_arg == optional_argument)
        {
          if (has_equal)
        optarg = has_equal;
          else if (long_options[match].has_arg == required_argument)
        {
          /*
           * optional argument doesn't use
           * next nargv
           */
          optarg = nargv[optind++];
        }
        }
      if ((long_options[match].has_arg == required_argument) && (optarg == NULL))
        {
          /*
           * Missing argument; leading ':'
           * indicates no error should be generated
           */
          if (PRINT_ERROR)
        xwarnx (recargstring, current_argv);
          /*
           * XXX: GNU sets optopt to val regardless
           * of flag
           */
          if (long_options[match].flag == NULL)
        optopt = long_options[match].val;
          else
        optopt = 0;
          /* XXX: GNU returns '?' if options[0] != ':' */
          --optind;
          return BADARG;
        }
    }
      else
    {           /* unknown option */
      if (PRINT_ERROR)
        xwarnx (illoptstring, current_argv);
      optopt = 0;
      return BADCH;
    }
      if (long_options[match].flag)
    {
      *long_options[match].flag = long_options[match].val;
      retval = 0;
    }
      else
    retval = long_options[match].val;
      if (idx)
    *idx = match;
    }
  return retval;
}
#endif /* !HAVE_GETOPT_LONG */