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/*
Getopt for GNU.
Copyright (C) 1987, 1989 Free Software Foundation, Inc.
(Modified by Douglas C. Schmidt for use with GNU G++.)
This file is part of the GNU C++ Library. This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version. This library is distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef __GNUG__
#pragma implementation
#endif
/* AIX requires the alloca decl to be the first thing in the file. */
#ifdef __GNUC__
#define alloca __builtin_alloca
#elif defined(sparc)
#include <alloca.h>
extern "C" void *__builtin_alloca(...);
#elif defined(_AIX)
#pragma alloca
#else
char *alloca ();
#endif
#include <GetOpt.h>
char* GetOpt::nextchar = 0;
int GetOpt::first_nonopt = 0;
int GetOpt::last_nonopt = 0;
GetOpt::GetOpt (int argc, char **argv, const char *optstring)
:opterr (1), nargc (argc), nargv (argv), noptstring (optstring)
{
/* Initialize the internal data when the first call is made.
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. */
first_nonopt = last_nonopt = optind = 1;
optarg = nextchar = 0;
/* Determine how to handle the ordering of options and nonoptions. */
if (optstring[0] == '-')
ordering = RETURN_IN_ORDER;
else if (getenv ("_POSIX_OPTION_ORDER") != 0)
ordering = REQUIRE_ORDER;
else
ordering = PERMUTE;
}
void
GetOpt::exchange (char **argv)
{
int nonopts_size
= (last_nonopt - first_nonopt) * sizeof (char *);
char **temp = (char **) alloca (nonopts_size);
/* Interchange the two blocks of data in argv. */
memcpy (temp, &argv[first_nonopt], nonopts_size);
memcpy (&argv[first_nonopt], &argv[last_nonopt],
(optind - last_nonopt) * sizeof (char *));
memcpy (&argv[first_nonopt + optind - last_nonopt], temp,
nonopts_size);
/* Update records for the slots the non-options now occupy. */
first_nonopt += (optind - last_nonopt);
last_nonopt = optind;
}
/* Scan elements of ARGV (whose length is ARGC) for option characters
given in OPTSTRING.
If an element of ARGV starts with '-', and is not exactly "-" or "--",
then it is an option element. The characters of this element
(aside from the initial '-') are option characters. If `getopt'
is called repeatedly, it returns successively each of theoption characters
from each of the option elements.
If `getopt' finds another option character, it returns that character,
updating `optind' and `nextchar' so that the next call to `getopt' can
resume the scan with the following option character or ARGV-element.
If there are no more option characters, `getopt' returns `EOF'.
Then `optind' is the index in ARGV of the first ARGV-element
that is not an option. (The ARGV-elements have been permuted
so that those that are not options now come last.)
OPTSTRING is a string containing the legitimate option characters.
A colon in OPTSTRING means that the previous character is an option
that wants an argument. The argument is taken from the rest of the
current ARGV-element, or from the following ARGV-element,
and returned in `optarg'.
If an option character is seen that is not listed in OPTSTRING,
return '?' after printing an error message. If you set `opterr' to
zero, the error message is suppressed but we still return '?'.
If a char in OPTSTRING is followed by a colon, that means it wants an arg,
so the following text in the same ARGV-element, or the text of the following
ARGV-element, is returned in `optarg. Two colons mean an option that
wants an optional arg; if there is text in the current ARGV-element,
it is returned in `optarg'.
If OPTSTRING starts with `-', it requests a different method of handling the
non-option ARGV-elements. See the comments about RETURN_IN_ORDER, above. */
int
GetOpt::operator () (void)
{
if (nextchar == 0 || *nextchar == 0)
{
if (ordering == PERMUTE)
{
/* If we have just processed some options following some non-options,
exchange them so that the options come first. */
if (first_nonopt != last_nonopt && last_nonopt != optind)
exchange (nargv);
else if (last_nonopt != optind)
first_nonopt = optind;
/* Now skip any additional non-options
and extend the range of non-options previously skipped. */
while (optind < nargc
&& (nargv[optind][0] != '-'
|| nargv[optind][1] == 0))
optind++;
last_nonopt = optind;
}
/* 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 (optind != nargc && !strcmp (nargv[optind], "--"))
{
optind++;
if (first_nonopt != last_nonopt && last_nonopt != optind)
exchange (nargv);
else if (first_nonopt == last_nonopt)
first_nonopt = optind;
last_nonopt = nargc;
optind = nargc;
}
/* If we have done all the ARGV-elements, stop the scan
and back over any non-options that we skipped and permuted. */
if (optind == nargc)
{
/* Set the next-arg-index to point at the non-options
that we previously skipped, so the caller will digest them. */
if (first_nonopt != last_nonopt)
optind = first_nonopt;
return EOF;
}
/* 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 (nargv[optind][0] != '-' || nargv[optind][1] == 0)
{
if (ordering == REQUIRE_ORDER)
return EOF;
optarg = nargv[optind++];
return 0;
}
/* We have found another option-ARGV-element.
Start decoding its characters. */
nextchar = nargv[optind] + 1;
}
/* Look at and handle the next option-character. */
{
char c = *nextchar++;
char *temp = (char *) strchr (noptstring, c);
/* Increment `optind' when we start to process its last character. */
if (*nextchar == 0)
optind++;
if (temp == 0 || c == ':')
{
if (opterr != 0)
{
if (c < 040 || c >= 0177)
fprintf (stderr, "%s: unrecognized option, character code 0%o\n",
nargv[0], c);
else
fprintf (stderr, "%s: unrecognized option `-%c'\n",
nargv[0], c);
}
return '?';
}
if (temp[1] == ':')
{
if (temp[2] == ':')
{
/* This is an option that accepts an argument optionally. */
if (*nextchar != 0)
{
optarg = nextchar;
optind++;
}
else
optarg = 0;
nextchar = 0;
}
else
{
/* This is an option that requires an argument. */
if (*nextchar != 0)
{
optarg = nextchar;
/* If we end this ARGV-element by taking the rest as an arg,
we must advance to the next element now. */
optind++;
}
else if (optind == nargc)
{
if (opterr != 0)
fprintf (stderr, "%s: no argument for `-%c' option\n",
nargv[0], c);
c = '?';
}
else
/* We already incremented `optind' once;
increment it again when taking next ARGV-elt as argument. */
optarg = nargv[optind++];
nextchar = 0;
}
}
return c;
}
}
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