getopt.c File Reference

#include <config.h>
#include "getopt.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "getopt_int.h"

Go to the source code of this file.

Macros
#define	_(msgid)   (msgid)
#define	attribute_hidden
#define	SWAP_FLAGS(ch1, ch2)
#define	NONOPTION_P   (argv[d->optind][0] != '-' || argv[d->optind][1] == '\0')

Enumerations
enum	{ POSIXLY_CORRECT = 1 }

Functions
static void	exchange (char **argv, struct _getopt_data *d)
static const char *	_getopt_initialize (int argc, char **argv, const char *optstring, int posixly_correct, struct _getopt_data *d)
int	_getopt_internal_r (int argc, char **argv, const char *optstring, const struct option *longopts, int *longind, int long_only, int posixly_correct, struct _getopt_data *d)
int	_getopt_internal (int argc, char **argv, const char *optstring, const struct option *longopts, int *longind, int long_only, int posixly_correct)
int	getopt (int argc, char *const *argv, const char *optstring)

Variables
char *	optarg
int	optind = 1
int	opterr = 1
int	optopt = '?'
static struct _getopt_data	getopt_data

Macro Definition Documentation

_

#define _

(

msgid

)

(msgid)

Definition at line 49 of file getopt.c.

attribute_hidden

#define attribute_hidden

Definition at line 56 of file getopt.c.

NONOPTION_P

#define NONOPTION_P   (argv[d->optind][0] != '-' || argv[d->optind][1] == '\0')

SWAP_FLAGS

#define SWAP_FLAGS	(		ch1,
			ch2
	)

Definition at line 145 of file getopt.c.

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
POSIXLY_CORRECT

Definition at line 1118 of file getopt.c.

{ POSIXLY_CORRECT = 1 };

Function Documentation

_getopt_initialize()

static const char* _getopt_initialize ( int  argc, char **  argv, const char *  optstring, int  posixly_correct, struct _getopt_data *  d  )

static

Definition at line 239 of file getopt.c.

{
  /* Start processing options with ARGV-element 1 (since ARGV-element 0
     is the program name); the sequence of previously skipped
     non-option ARGV-elements is empty.  */
 
  d->__first_nonopt = d->__last_nonopt = d->optind;
 
  d->__nextchar = NULL;
 
  d->__posixly_correct = posixly_correct || !!getenv ("POSIXLY_CORRECT");
 
  /* Determine how to handle the ordering of options and nonoptions.  */
 
  if (optstring[0] == '-')
    {
      d->__ordering = RETURN_IN_ORDER;
      ++optstring;
    }
  else if (optstring[0] == '+')
    {
      d->__ordering = REQUIRE_ORDER;
      ++optstring;
    }
  else if (d->__posixly_correct)
    d->__ordering = REQUIRE_ORDER;
  else
    d->__ordering = PERMUTE;
 
#if defined _LIBC && defined USE_NONOPTION_FLAGS
  if (!d->__posixly_correct
      && argc == __libc_argc && argv == __libc_argv)
    {
      if (d->__nonoption_flags_max_len == 0)
    {
      if (__getopt_nonoption_flags == NULL
          || __getopt_nonoption_flags[0] == '\0')
        d->__nonoption_flags_max_len = -1;
      else
        {
          const char *orig_str = __getopt_nonoption_flags;
          int len = d->__nonoption_flags_max_len = strlen (orig_str);
          if (d->__nonoption_flags_max_len < argc)
        d->__nonoption_flags_max_len = argc;
          __getopt_nonoption_flags =
        (char *) malloc (d->__nonoption_flags_max_len);
          if (__getopt_nonoption_flags == NULL)
        d->__nonoption_flags_max_len = -1;
          else
        memset (__mempcpy (__getopt_nonoption_flags, orig_str, len),
            '\0', d->__nonoption_flags_max_len - len);
        }
    }
      d->__nonoption_flags_len = d->__nonoption_flags_max_len;
    }
  else
    d->__nonoption_flags_len = 0;
#endif
 
  return optstring;
}

References argv, d, getenv(), len, malloc(), memset(), NULL, PERMUTE, posixly_correct, REQUIRE_ORDER, and RETURN_IN_ORDER.

Referenced by _getopt_internal_r().

_getopt_internal()

int _getopt_internal	(	int	argc,
		char **	argv,
		const char *	optstring,
		const struct option *	longopts,
		int *	longind,
		int	long_only,
		int	posixly_correct
	)

Definition at line 1094 of file getopt.c.

{
  int result;
 
  getopt_data.optind = optind;
  getopt_data.opterr = opterr;
 
  result = _getopt_internal_r (argc, argv, optstring, longopts, longind,
                   long_only, posixly_correct, &getopt_data);
 
  optind = getopt_data.optind;
  optarg = getopt_data.optarg;
  optopt = getopt_data.optopt;
 
  return result;
}

References _getopt_internal_r(), argv, getopt_data, optarg, _getopt_data::optarg, opterr, _getopt_data::opterr, optind, _getopt_data::optind, optopt, _getopt_data::optopt, and posixly_correct.

_getopt_internal_r()

int _getopt_internal_r	(	int	argc,
		char **	argv,
		const char *	optstring,
		const struct option *	longopts,
		int *	longind,
		int	long_only,
		int	posixly_correct,
		struct _getopt_data *	d
	)

Definition at line 358 of file getopt.c.

{
  int print_errors = d->opterr;
  if (optstring[0] == ':')
    print_errors = 0;
 
  if (argc < 1)
    return -1;
 
  d->optarg = NULL;
 
  if (d->optind == 0 || !d->__initialized)
    {
      if (d->optind == 0)
    d->optind = 1;  /* Don't scan ARGV[0], the program name.  */
      optstring = _getopt_initialize (argc, argv, optstring,
                      posixly_correct, d);
      d->__initialized = 1;
    }
 
  /* Test whether ARGV[optind] points to a non-option argument.
     Either it does not have option syntax, or there is an environment flag
     from the shell indicating it is not an option.  The later information
     is only used when the used in the GNU libc.  */
#if defined _LIBC && defined USE_NONOPTION_FLAGS
# define NONOPTION_P (argv[d->optind][0] != '-' || argv[d->optind][1] == '\0' \
              || (d->optind < d->__nonoption_flags_len            \
              && __getopt_nonoption_flags[d->optind] == '1'))
#else
# define NONOPTION_P (argv[d->optind][0] != '-' || argv[d->optind][1] == '\0')
#endif
 
  if (d->__nextchar == NULL || *d->__nextchar == '\0')
    {
      /* Advance to the next ARGV-element.  */
 
      /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been
     moved back by the user (who may also have changed the arguments).  */
      if (d->__last_nonopt > d->optind)
    d->__last_nonopt = d->optind;
      if (d->__first_nonopt > d->optind)
    d->__first_nonopt = d->optind;
 
      if (d->__ordering == PERMUTE)
    {
      /* If we have just processed some options following some non-options,
         exchange them so that the options come first.  */
 
      if (d->__first_nonopt != d->__last_nonopt
          && d->__last_nonopt != d->optind)
        exchange ((char **) argv, d);
      else if (d->__last_nonopt != d->optind)
        d->__first_nonopt = d->optind;
 
      /* Skip any additional non-options
         and extend the range of non-options previously skipped.  */
 
      while (d->optind < argc && NONOPTION_P)
        d->optind++;
      d->__last_nonopt = d->optind;
    }
 
      /* The special ARGV-element `--' means premature end of options.
     Skip it like a null option,
     then exchange with previous non-options as if it were an option,
     then skip everything else like a non-option.  */
 
      if (d->optind != argc && !strcmp (argv[d->optind], "--"))
    {
      d->optind++;
 
      if (d->__first_nonopt != d->__last_nonopt
          && d->__last_nonopt != d->optind)
        exchange ((char **) argv, d);
      else if (d->__first_nonopt == d->__last_nonopt)
        d->__first_nonopt = d->optind;
      d->__last_nonopt = argc;
 
      d->optind = argc;
    }
 
      /* If we have done all the ARGV-elements, stop the scan
     and back over any non-options that we skipped and permuted.  */
 
      if (d->optind == argc)
    {
      /* Set the next-arg-index to point at the non-options
         that we previously skipped, so the caller will digest them.  */
      if (d->__first_nonopt != d->__last_nonopt)
        d->optind = d->__first_nonopt;
      return -1;
    }
 
      /* If we have come to a non-option and did not permute it,
     either stop the scan or describe it to the caller and pass it by.  */
 
      if (NONOPTION_P)
    {
      if (d->__ordering == REQUIRE_ORDER)
        return -1;
      d->optarg = argv[d->optind++];
      return 1;
    }
 
      /* We have found another option-ARGV-element.
     Skip the initial punctuation.  */
 
      d->__nextchar = (argv[d->optind] + 1
          + (longopts != NULL && argv[d->optind][1] == '-'));
    }
 
  /* Decode the current option-ARGV-element.  */
 
  /* Check whether the ARGV-element is a long option.
 
     If long_only and the ARGV-element has the form "-f", where f is
     a valid short option, don't consider it an abbreviated form of
     a long option that starts with f.  Otherwise there would be no
     way to give the -f short option.
 
     On the other hand, if there's a long option "fubar" and
     the ARGV-element is "-fu", do consider that an abbreviation of
     the long option, just like "--fu", and not "-f" with arg "u".
 
     This distinction seems to be the most useful approach.  */
 
  if (longopts != NULL
      && (argv[d->optind][1] == '-'
      || (long_only && (argv[d->optind][2]
                || !strchr (optstring, argv[d->optind][1])))))
    {
      char *nameend;
      const struct option *p;
      const struct option *pfound = NULL;
      int exact = 0;
      int ambig = 0;
      int indfound = -1;
      int option_index;
 
      for (nameend = d->__nextchar; *nameend && *nameend != '='; nameend++)
    /* Do nothing.  */ ;
 
      /* Test all long options for either exact match
     or abbreviated matches.  */
      for (p = longopts, option_index = 0; p->name; p++, option_index++)
    if (!strncmp (p->name, d->__nextchar, nameend - d->__nextchar))
      {
        if ((unsigned int) (nameend - d->__nextchar)
        == (unsigned int) strlen (p->name))
          {
        /* Exact match found.  */
        pfound = p;
        indfound = option_index;
        exact = 1;
        break;
          }
        else if (pfound == NULL)
          {
        /* First nonexact match found.  */
        pfound = p;
        indfound = option_index;
          }
        else if (long_only
             || pfound->has_arg != p->has_arg
             || pfound->flag != p->flag
             || pfound->val != p->val)
          /* Second or later nonexact match found.  */
          ambig = 1;
      }
 
      if (ambig && !exact)
    {
      if (print_errors)
        {
#if defined _LIBC && defined USE_IN_LIBIO
          char *buf;
 
          if (__asprintf (&buf, _("%s: option `%s' is ambiguous\n"),
                  argv[0], argv[d->optind]) >= 0)
        {
          _IO_flockfile (stderr);
 
          int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
          ((_IO_FILE *) stderr)->_flags2 |= _IO_FLAGS2_NOTCANCEL;
 
          __fxprintf (NULL, "%s", buf);
 
          ((_IO_FILE *) stderr)->_flags2 = old_flags2;
          _IO_funlockfile (stderr);
 
          free (buf);
        }
#else
          fprintf (stderr, _("%s: option `%s' is ambiguous\n"),
               argv[0], argv[d->optind]);
#endif
        }
      d->__nextchar += strlen (d->__nextchar);
      d->optind++;
      d->optopt = 0;
      return '?';
    }
 
      if (pfound != NULL)
    {
      option_index = indfound;
      d->optind++;
      if (*nameend)
        {
          /* Don't test has_arg with >, because some C compilers don't
         allow it to be used on enums.  */
          if (pfound->has_arg)
        d->optarg = nameend + 1;
          else
        {
          if (print_errors)
            {
#if defined _LIBC && defined USE_IN_LIBIO
              char *buf;
              int n;
#endif
 
              if (argv[d->optind - 1][1] == '-')
            {
              /* --option */
#if defined _LIBC && defined USE_IN_LIBIO
              n = __asprintf (&buf, _("\
%s: option `--%s' doesn't allow an argument\n"),
                      argv[0], pfound->name);
#else
              fprintf (stderr, _("\
%s: option `--%s' doesn't allow an argument\n"),
                   argv[0], pfound->name);
#endif
            }
              else
            {
              /* +option or -option */
#if defined _LIBC && defined USE_IN_LIBIO
              n = __asprintf (&buf, _("\
%s: option `%c%s' doesn't allow an argument\n"),
                      argv[0], argv[d->optind - 1][0],
                      pfound->name);
#else
              fprintf (stderr, _("\
%s: option `%c%s' doesn't allow an argument\n"),
                   argv[0], argv[d->optind - 1][0],
                   pfound->name);
#endif
            }
 
#if defined _LIBC && defined USE_IN_LIBIO
              if (n >= 0)
            {
              _IO_flockfile (stderr);
 
              int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
              ((_IO_FILE *) stderr)->_flags2
                |= _IO_FLAGS2_NOTCANCEL;
 
              __fxprintf (NULL, "%s", buf);
 
              ((_IO_FILE *) stderr)->_flags2 = old_flags2;
              _IO_funlockfile (stderr);
 
              free (buf);
            }
#endif
            }
 
          d->__nextchar += strlen (d->__nextchar);
 
          d->optopt = pfound->val;
          return '?';
        }
        }
      else if (pfound->has_arg == 1)
        {
          if (d->optind < argc)
        d->optarg = argv[d->optind++];
          else
        {
          if (print_errors)
            {
#if defined _LIBC && defined USE_IN_LIBIO
              char *buf;
 
              if (__asprintf (&buf, _("\
%s: option `%s' requires an argument\n"),
                      argv[0], argv[d->optind - 1]) >= 0)
            {
              _IO_flockfile (stderr);
 
              int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
              ((_IO_FILE *) stderr)->_flags2
                |= _IO_FLAGS2_NOTCANCEL;
 
              __fxprintf (NULL, "%s", buf);
 
              ((_IO_FILE *) stderr)->_flags2 = old_flags2;
              _IO_funlockfile (stderr);
 
              free (buf);
            }
#else
              fprintf (stderr,
                   _("%s: option `%s' requires an argument\n"),
                   argv[0], argv[d->optind - 1]);
#endif
            }
          d->__nextchar += strlen (d->__nextchar);
          d->optopt = pfound->val;
          return optstring[0] == ':' ? ':' : '?';
        }
        }
      d->__nextchar += strlen (d->__nextchar);
      if (longind != NULL)
        *longind = option_index;
      if (pfound->flag)
        {
          *(pfound->flag) = pfound->val;
          return 0;
        }
      return pfound->val;
    }
 
      /* Can't find it as a long option.  If this is not getopt_long_only,
     or the option starts with '--' or is not a valid short
     option, then it's an error.
     Otherwise interpret it as a short option.  */
      if (!long_only || argv[d->optind][1] == '-'
      || strchr (optstring, *d->__nextchar) == NULL)
    {
      if (print_errors)
        {
#if defined _LIBC && defined USE_IN_LIBIO
          char *buf;
          int n;
#endif
 
          if (argv[d->optind][1] == '-')
        {
          /* --option */
#if defined _LIBC && defined USE_IN_LIBIO
          n = __asprintf (&buf, _("%s: unrecognized option `--%s'\n"),
                  argv[0], d->__nextchar);
#else
          fprintf (stderr, _("%s: unrecognized option `--%s'\n"),
               argv[0], d->__nextchar);
#endif
        }
          else
        {
          /* +option or -option */
#if defined _LIBC && defined USE_IN_LIBIO
          n = __asprintf (&buf, _("%s: unrecognized option `%c%s'\n"),
                  argv[0], argv[d->optind][0], d->__nextchar);
#else
          fprintf (stderr, _("%s: unrecognized option `%c%s'\n"),
               argv[0], argv[d->optind][0], d->__nextchar);
#endif
        }
 
#if defined _LIBC && defined USE_IN_LIBIO
          if (n >= 0)
        {
          _IO_flockfile (stderr);
 
          int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
          ((_IO_FILE *) stderr)->_flags2 |= _IO_FLAGS2_NOTCANCEL;
 
          __fxprintf (NULL, "%s", buf);
 
          ((_IO_FILE *) stderr)->_flags2 = old_flags2;
          _IO_funlockfile (stderr);
 
          free (buf);
        }
#endif
        }
      d->__nextchar = (char *) "";
      d->optind++;
      d->optopt = 0;
      return '?';
    }
    }
 
  /* Look at and handle the next short option-character.  */
 
  {
    char c = *d->__nextchar++;
    char *temp = strchr (optstring, c);
 
    /* Increment `optind' when we start to process its last character.  */
    if (*d->__nextchar == '\0')
      ++d->optind;
 
    if (temp == NULL || c == ':')
      {
    if (print_errors)
      {
#if defined _LIBC && defined USE_IN_LIBIO
          char *buf;
          int n;
#endif
 
        if (d->__posixly_correct)
          {
        /* 1003.2 specifies the format of this message.  */
#if defined _LIBC && defined USE_IN_LIBIO
        n = __asprintf (&buf, _("%s: illegal option -- %c\n"),
                argv[0], c);
#else
        fprintf (stderr, _("%s: illegal option -- %c\n"), argv[0], c);
#endif
          }
        else
          {
#if defined _LIBC && defined USE_IN_LIBIO
        n = __asprintf (&buf, _("%s: invalid option -- %c\n"),
                argv[0], c);
#else
        fprintf (stderr, _("%s: invalid option -- %c\n"), argv[0], c);
#endif
          }
 
#if defined _LIBC && defined USE_IN_LIBIO
        if (n >= 0)
          {
        _IO_flockfile (stderr);
 
        int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
        ((_IO_FILE *) stderr)->_flags2 |= _IO_FLAGS2_NOTCANCEL;
 
        __fxprintf (NULL, "%s", buf);
 
        ((_IO_FILE *) stderr)->_flags2 = old_flags2;
        _IO_funlockfile (stderr);
 
        free (buf);
          }
#endif
      }
    d->optopt = c;
    return '?';
      }
    /* Convenience. Treat POSIX -W foo same as long option --foo */
    if (temp[0] == 'W' && temp[1] == ';')
      {
    char *nameend;
    const struct option *p;
    const struct option *pfound = NULL;
    int exact = 0;
    int ambig = 0;
    int indfound = 0;
    int option_index;
 
    /* This is an option that requires an argument.  */
    if (*d->__nextchar != '\0')
      {
        d->optarg = d->__nextchar;
        /* If we end this ARGV-element by taking the rest as an arg,
           we must advance to the next element now.  */
        d->optind++;
      }
    else if (d->optind == argc)
      {
        if (print_errors)
          {
        /* 1003.2 specifies the format of this message.  */
#if defined _LIBC && defined USE_IN_LIBIO
        char *buf;
 
        if (__asprintf (&buf,
                _("%s: option requires an argument -- %c\n"),
                argv[0], c) >= 0)
          {
            _IO_flockfile (stderr);
 
            int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
            ((_IO_FILE *) stderr)->_flags2 |= _IO_FLAGS2_NOTCANCEL;
 
            __fxprintf (NULL, "%s", buf);
 
            ((_IO_FILE *) stderr)->_flags2 = old_flags2;
            _IO_funlockfile (stderr);
 
            free (buf);
          }
#else
        fprintf (stderr, _("%s: option requires an argument -- %c\n"),
             argv[0], c);
#endif
          }
        d->optopt = c;
        if (optstring[0] == ':')
          c = ':';
        else
          c = '?';
        return c;
      }
    else
      /* We already incremented `d->optind' once;
         increment it again when taking next ARGV-elt as argument.  */
      d->optarg = argv[d->optind++];
 
    /* optarg is now the argument, see if it's in the
       table of longopts.  */
 
    for (d->__nextchar = nameend = d->optarg; *nameend && *nameend != '=';
         nameend++)
      /* Do nothing.  */ ;
 
    /* Test all long options for either exact match
       or abbreviated matches.  */
    for (p = longopts, option_index = 0; p->name; p++, option_index++)
      if (!strncmp (p->name, d->__nextchar, nameend - d->__nextchar))
        {
          if ((unsigned int) (nameend - d->__nextchar) == strlen (p->name))
        {
          /* Exact match found.  */
          pfound = p;
          indfound = option_index;
          exact = 1;
          break;
        }
          else if (pfound == NULL)
        {
          /* First nonexact match found.  */
          pfound = p;
          indfound = option_index;
        }
          else
        /* Second or later nonexact match found.  */
        ambig = 1;
        }
    if (ambig && !exact)
      {
        if (print_errors)
          {
#if defined _LIBC && defined USE_IN_LIBIO
        char *buf;
 
        if (__asprintf (&buf, _("%s: option `-W %s' is ambiguous\n"),
                argv[0], argv[d->optind]) >= 0)
          {
            _IO_flockfile (stderr);
 
            int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
            ((_IO_FILE *) stderr)->_flags2 |= _IO_FLAGS2_NOTCANCEL;
 
            __fxprintf (NULL, "%s", buf);
 
            ((_IO_FILE *) stderr)->_flags2 = old_flags2;
            _IO_funlockfile (stderr);
 
            free (buf);
          }
#else
        fprintf (stderr, _("%s: option `-W %s' is ambiguous\n"),
             argv[0], argv[d->optind]);
#endif
          }
        d->__nextchar += strlen (d->__nextchar);
        d->optind++;
        return '?';
      }
    if (pfound != NULL)
      {
        option_index = indfound;
        if (*nameend)
          {
        /* Don't test has_arg with >, because some C compilers don't
           allow it to be used on enums.  */
        if (pfound->has_arg)
          d->optarg = nameend + 1;
        else
          {
            if (print_errors)
              {
#if defined _LIBC && defined USE_IN_LIBIO
            char *buf;
 
            if (__asprintf (&buf, _("\
%s: option `-W %s' doesn't allow an argument\n"),
                    argv[0], pfound->name) >= 0)
              {
                _IO_flockfile (stderr);
 
                int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
                ((_IO_FILE *) stderr)->_flags2
                  |= _IO_FLAGS2_NOTCANCEL;
 
                __fxprintf (NULL, "%s", buf);
 
                ((_IO_FILE *) stderr)->_flags2 = old_flags2;
                _IO_funlockfile (stderr);
 
                free (buf);
              }
#else
            fprintf (stderr, _("\
%s: option `-W %s' doesn't allow an argument\n"),
                 argv[0], pfound->name);
#endif
              }
 
            d->__nextchar += strlen (d->__nextchar);
            return '?';
          }
          }
        else if (pfound->has_arg == 1)
          {
        if (d->optind < argc)
          d->optarg = argv[d->optind++];
        else
          {
            if (print_errors)
              {
#if defined _LIBC && defined USE_IN_LIBIO
            char *buf;
 
            if (__asprintf (&buf, _("\
%s: option `%s' requires an argument\n"),
                    argv[0], argv[d->optind - 1]) >= 0)
              {
                _IO_flockfile (stderr);
 
                int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
                ((_IO_FILE *) stderr)->_flags2
                  |= _IO_FLAGS2_NOTCANCEL;
 
                __fxprintf (NULL, "%s", buf);
 
                ((_IO_FILE *) stderr)->_flags2 = old_flags2;
                _IO_funlockfile (stderr);
 
                free (buf);
              }
#else
            fprintf (stderr,
                 _("%s: option `%s' requires an argument\n"),
                 argv[0], argv[d->optind - 1]);
#endif
              }
            d->__nextchar += strlen (d->__nextchar);
            return optstring[0] == ':' ? ':' : '?';
          }
          }
        d->__nextchar += strlen (d->__nextchar);
        if (longind != NULL)
          *longind = option_index;
        if (pfound->flag)
          {
        *(pfound->flag) = pfound->val;
        return 0;
          }
        return pfound->val;
      }
      d->__nextchar = NULL;
      return 'W';   /* Let the application handle it.   */
      }
    if (temp[1] == ':')
      {
    if (temp[2] == ':')
      {
        /* This is an option that accepts an argument optionally.  */
        if (*d->__nextchar != '\0')
          {
        d->optarg = d->__nextchar;
        d->optind++;
          }
        else
          d->optarg = NULL;
        d->__nextchar = NULL;
      }
    else
      {
        /* This is an option that requires an argument.  */
        if (*d->__nextchar != '\0')
          {
        d->optarg = d->__nextchar;
        /* If we end this ARGV-element by taking the rest as an arg,
           we must advance to the next element now.  */
        d->optind++;
          }
        else if (d->optind == argc)
          {
        if (print_errors)
          {
            /* 1003.2 specifies the format of this message.  */
#if defined _LIBC && defined USE_IN_LIBIO
            char *buf;
 
            if (__asprintf (&buf, _("\
%s: option requires an argument -- %c\n"),
                    argv[0], c) >= 0)
              {
            _IO_flockfile (stderr);
 
            int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
            ((_IO_FILE *) stderr)->_flags2 |= _IO_FLAGS2_NOTCANCEL;
 
            __fxprintf (NULL, "%s", buf);
 
            ((_IO_FILE *) stderr)->_flags2 = old_flags2;
            _IO_funlockfile (stderr);
 
            free (buf);
              }
#else
            fprintf (stderr,
                 _("%s: option requires an argument -- %c\n"),
                 argv[0], c);
#endif
          }
        d->optopt = c;
        if (optstring[0] == ':')
          c = ':';
        else
          c = '?';
          }
        else
          /* We already incremented `optind' once;
         increment it again when taking next ARGV-elt as argument.  */
          d->optarg = argv[d->optind++];
        d->__nextchar = NULL;
      }
      }
    return c;
  }
}

References _, _getopt_initialize(), argv, c, d, exchange(), option::flag, free(), option::has_arg, n, option::name, NONOPTION_P, NULL, p, PERMUTE, posixly_correct, REQUIRE_ORDER, and option::val.

Referenced by _getopt_internal(), _getopt_long_only_r(), and _getopt_long_r().

exchange()

static void exchange ( char **  argv, struct _getopt_data *  d  )

static

Definition at line 158 of file getopt.c.

{
  int bottom = d->__first_nonopt;
  int middle = d->__last_nonopt;
  int top = d->optind;
  char *tem;
 
  /* Exchange the shorter segment with the far end of the longer segment.
     That puts the shorter segment into the right place.
     It leaves the longer segment in the right place overall,
     but it consists of two parts that need to be swapped next.  */
 
#if defined _LIBC && defined USE_NONOPTION_FLAGS
  /* First make sure the handling of the `__getopt_nonoption_flags'
     string can work normally.  Our top argument must be in the range
     of the string.  */
  if (d->__nonoption_flags_len > 0 && top >= d->__nonoption_flags_max_len)
    {
      /* We must extend the array.  The user plays games with us and
     presents new arguments.  */
      char *new_str = malloc (top + 1);
      if (new_str == NULL)
    d->__nonoption_flags_len = d->__nonoption_flags_max_len = 0;
      else
    {
      memset (__mempcpy (new_str, __getopt_nonoption_flags,
                 d->__nonoption_flags_max_len),
          '\0', top + 1 - d->__nonoption_flags_max_len);
      d->__nonoption_flags_max_len = top + 1;
      __getopt_nonoption_flags = new_str;
    }
    }
#endif
 
  while (top > middle && middle > bottom)
    {
      if (top - middle > middle - bottom)
    {
      /* Bottom segment is the short one.  */
      int len = middle - bottom;
      register int i;
 
      /* Swap it with the top part of the top segment.  */
      for (i = 0; i < len; i++)
        {
          tem = argv[bottom + i];
          argv[bottom + i] = argv[top - (middle - bottom) + i];
          argv[top - (middle - bottom) + i] = tem;
          SWAP_FLAGS (bottom + i, top - (middle - bottom) + i);
        }
      /* Exclude the moved bottom segment from further swapping.  */
      top -= len;
    }
      else
    {
      /* Top segment is the short one.  */
      int len = top - middle;
      register int i;
 
      /* Swap it with the bottom part of the bottom segment.  */
      for (i = 0; i < len; i++)
        {
          tem = argv[bottom + i];
          argv[bottom + i] = argv[middle + i];
          argv[middle + i] = tem;
          SWAP_FLAGS (bottom + i, middle + i);
        }
      /* Exclude the moved top segment from further swapping.  */
      bottom += len;
    }
    }
 
  /* Update records for the slots the non-options now occupy.  */
 
  d->__first_nonopt += (d->optind - d->__last_nonopt);
  d->__last_nonopt = d->optind;
}

References argv, d, i, len, malloc(), memset(), NULL, and SWAP_FLAGS.

Referenced by _getopt_internal_r().

getopt()

int getopt	(	int	argc,
		char *const *	argv,
		const char *	optstring
	)

Definition at line 1122 of file getopt.c.

{
  return _getopt_internal (argc, (char **) argv, optstring, NULL, NULL, 0,
               POSIXLY_CORRECT);
}

References _getopt_internal(), argv, NULL, and POSIXLY_CORRECT.

Variable Documentation

getopt_data

struct _getopt_data getopt_data

static

Definition at line 107 of file getopt.c.

Referenced by _getopt_internal().

optarg

char* optarg

Definition at line 81 of file getopt.c.

opterr

int opterr = 1

Definition at line 101 of file getopt.c.

optind

int optind = 1

Definition at line 96 of file getopt.c.

optopt

int optopt = '?'

Definition at line 107 of file getopt.c.

Referenced by main().