smtpclient_getopt.c

smtp客户端工具源代码。

/*   ____  __  _ _____ ____     _ _            _   
**  / ___||  \/ |_   _|  _ \___| (_) ___ _ __ | |_ 
**  \___ \| |\/| || | | |_)/ __| | |/ _ \ '_ \| __|
**   ___) | |  | || | |  _| (__| | |  __/ | | | |_ 
**  |____/|_|  |_||_| |_|  \___|_|_|\___|_| |_|\__|
**   
**  SMTPclient -- simple SMTP client
**
**  This program is a minimal SMTP client that takes an email
**  message body and passes it on to a SMTP server (default is the
**  MTA on the local host). Since it is completely self-supporting,
**  it is especially suitable for use in restricted environments.
**
**  ======================================================================
**
**  Copyright (c) 1997 Ralf S. Engelschall, All rights reserved.
**
**  This program is free software; it may be redistributed and/or modified
**  only under the terms of either the Artistic License or the GNU General
**  Public License, which may be found in the SMTP source distribution.
**  Look at the file COPYING. 
**
**  This program 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 General Public License for more details.
**
**  ======================================================================
**
**  smtpclient_getopt.c -- GNU getopt() function
*/

/* Getopt for GNU.
   NOTE: getopt is now part of the C library, so if you don't know what
   "Keep this file name-space clean" means, talk to [e-mail]
   before changing it!

   Copyright (C) 1987, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97
        Free Software Foundation, Inc.

   The GNU C 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.

   The GNU C 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 the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.
   Ditto for AIX 3.2 and <stdlib.h>.  */
#ifndef _NO_PROTO
#define _NO_PROTO
#endif

#include "smtpclient_getopt.h"

#if !defined (__STDC__) || !__STDC__
/* This is a separate conditional since some stdc systems
   reject `defined (const)'.  */
#ifndef const
#define const
#endif
#endif

#include <stdio.h>

/* Comment out all this code if we are using the GNU C Library, and are not
   actually compiling the library itself.  This code is part of the GNU C
   Library, but also included in many other GNU distributions.  Compiling
   and linking in this code is a waste when using the GNU C library
   (especially if it is a shared library).  Rather than having every GNU
   program understand `configure --with-gnu-libc' and omit the object files,
   it is simpler to just do this in the source for each such file.  */

#define GETOPT_INTERFACE_VERSION 2
#if !defined (_LIBC) && defined (__GLIBC__) && __GLIBC__ >= 2
#include <gnu-versions.h>
#if _GNU_GETOPT_INTERFACE_VERSION == GETOPT_INTERFACE_VERSION
#define ELIDE_CODE
#endif
#endif

#ifndef ELIDE_CODE


/* This needs to come after some library #include
   to get __GNU_LIBRARY__ defined.  */
#ifdef  __GNU_LIBRARY__
/* Don't include stdlib.h for non-GNU C libraries because some of them
   contain conflicting prototypes for getopt.  */
#include <stdlib.h>
#include <unistd.h>
#endif  /* GNU C library.  */

#ifdef VMS
#include <unixlib.h>
#if HAVE_STRING_H - 0
#include <string.h>
#endif
#endif

#if defined (WIN32) && !defined (__CYGWIN32__)
/* It's not Unix, really.  See?  Capital letters.  */
#include <windows.h>
#define getpid() GetCurrentProcessId()
#endif

#ifndef _
/* This is for other GNU distributions with internationalized messages.
   When compiling libc, the _ macro is predefined.  */
#ifdef HAVE_LIBINTL_H
# include <libintl.h>
# define _(msgid)       gettext (msgid)
#else
# define _(msgid)       (msgid)
#endif
#endif

/* This version of `getopt' appears to the caller like standard Unix `getopt'
   but it behaves differently for the user, since it allows the user
   to intersperse the options with the other arguments.

   As `getopt' works, it permutes the elements of ARGV so that,
   when it is done, all the options precede everything else.  Thus
   all application programs are extended to handle flexible argument order.

   Setting the environment variable POSIXLY_CORRECT disables permutation.
   Then the behavior is completely standard.

   GNU application programs can use a third alternative mode in which
   they can distinguish the relative order of options and other arguments.  */

/* For communication from `getopt' to the caller.
   When `getopt' finds an option that takes an argument,
   the argument value is returned here.
   Also, when `ordering' is RETURN_IN_ORDER,
   each non-option ARGV-element is returned here.  */

char *optarg = NULL;

/* Index in ARGV of the next element to be scanned.
   This is used for communication to and from the caller
   and for communication between successive calls to `getopt'.

   On entry to `getopt', zero means this is the first call; initialize.

   When `getopt' returns -1, this is the index of the first of the
   non-option elements that the caller should itself scan.

   Otherwise, `optind' communicates from one call to the next
   how much of ARGV has been scanned so far.  */

/* 1003.2 says this must be 1 before any call.  */
int optind = 1;

/* Formerly, initialization of getopt depended on optind==0, which
   causes problems with re-calling getopt as programs generally don't
   know that. */

int __getopt_initialized = 0;

/* The next char to be scanned in the option-element
   in which the last option character we returned was found.
   This allows us to pick up the scan where we left off.

   If this is zero, or a null string, it means resume the scan
   by advancing to the next ARGV-element.  */

static char *nextchar;

/* Callers store zero here to inhibit the error message
   for unrecognized options.  */

int opterr = 1;

/* Set to an option character which was unrecognized.
   This must be initialized on some systems to avoid linking in the
   system's own getopt implementation.  */

int optopt = '?';

/* Describe how to deal with options that follow non-option ARGV-elements.

   If the caller did not specify anything,
   the default is REQUIRE_ORDER if the environment variable
   POSIXLY_CORRECT is defined, PERMUTE otherwise.

   REQUIRE_ORDER means don't recognize them as options;
   stop option processing when the first non-option is seen.
   This is what Unix does.
   This mode of operation is selected by either setting the environment
   variable POSIXLY_CORRECT, or using `+' as the first character
   of the list of option characters.

   PERMUTE is the default.  We permute the contents of ARGV as we scan,
   so that eventually all the non-options are at the end.  This allows options
   to be given in any order, even with programs that were not written to
   expect this.

   RETURN_IN_ORDER is an option available to programs that were written
   to expect options and other ARGV-elements in any order and that care about
   the ordering of the two.  We describe each non-option ARGV-element
   as if it were the argument of an option with character code 1.
   Using `-' as the first character of the list of option characters
   selects this mode of operation.

   The special argument `--' forces an end of option-scanning regardless
   of the value of `ordering'.  In the case of RETURN_IN_ORDER, only
   `--' can cause `getopt' to return -1 with `optind' != ARGC.  */

static enum
{
  REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
} ordering;

/* Value of POSIXLY_CORRECT environment variable.  */
static char *posixly_correct;

#ifdef  __GNU_LIBRARY__
/* We want to avoid inclusion of string.h with non-GNU libraries
   because there are many ways it can cause trouble.
   On some systems, it contains special magic macros that don't work
   in GCC.  */
#include <string.h>
#define my_index        strchr
#else

/* Avoid depending on library functions or files
   whose names are inconsistent.  */

char *getenv ();

static char *
my_index (str, chr)
     const char *str;
     int chr;
{
  while (*str)
    {
      if (*str == chr)
        return (char *) str;
      str++;
    }
  return 0;
}

/* If using GCC, we can safely declare strlen this way.
   If not using GCC, it is ok not to declare it.  */
#ifdef __GNUC__
/* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
   That was relevant to code that was here before.  */
#if !defined (__STDC__) || !__STDC__
/* gcc with -traditional declares the built-in strlen to return int,
   and has done so at least since version 2.4.5. -- rms.  */
extern int strlen (const char *);
#endif /* not __STDC__ */
#endif /* __GNUC__ */

#endif /* not __GNU_LIBRARY__ */

/* Handle permutation of arguments.  */

/* Describe the part of ARGV that contains non-options that have
   been skipped.  `first_nonopt' is the index in ARGV of the first of them;
   `last_nonopt' is the index after the last of them.  */

static int first_nonopt;
static int last_nonopt;

#ifdef _LIBC
/* Bash 2.0 gives us an environment variable containing flags
   indicating ARGV elements that should not be considered arguments.  */

/* Defined in getopt_init.c  */
extern char *__getopt_nonoption_flags;

static int nonoption_flags_max_len;
static int nonoption_flags_len;

static int original_argc;
static char *const *original_argv;

extern pid_t __libc_pid;

/* Make sure the environment variable bash 2.0 puts in the environment
   is valid for the getopt call we must make sure that the ARGV passed
   to getopt is that one passed to the process.  */
static void
__attribute__ ((unused))
store_args_and_env (int argc, char *const *argv)
{
  /* XXX This is no good solution.  We should rather copy the args so
     that we can compare them later.  But we must not use malloc(3).  */
  original_argc = argc;
  original_argv = argv;
}
text_set_element (__libc_subinit, store_args_and_env);

# define SWAP_FLAGS(ch1, ch2) \
  if (nonoption_flags_len > 0)                                                \
    {                                                                         \
      char __tmp = __getopt_nonoption_flags[ch1];                             \
      __getopt_nonoption_flags[ch1] = __getopt_nonoption_flags[ch2];          \
      __getopt_nonoption_flags[ch2] = __tmp;                                  \
    }
#else   /* !_LIBC */
# define SWAP_FLAGS(ch1, ch2)
#endif  /* _LIBC */

/* Exchange two adjacent subsequences of ARGV.
   One subsequence is elements [first_nonopt,last_nonopt)
   which contains all the non-options that have been skipped so far.
   The other is elements [last_nonopt,optind), which contains all
   the options processed since those non-options were skipped.

   `first_nonopt' and `last_nonopt' are relocated so that they describe
   the new indices of the non-options in ARGV after they are moved.  */

#if defined (__STDC__) && __STDC__
static void exchange (char **);
#endif

static void
exchange (argv)
     char **argv;
{
  int bottom = first_nonopt;
  int middle = last_nonopt;
  int top = 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.  */

#ifdef _LIBC
  /* 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 (nonoption_flags_len > 0 && top >= 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)
        nonoption_flags_len = nonoption_flags_max_len = 0;
      else
        {
          memcpy (new_str, __getopt_nonoption_flags, nonoption_flags_max_len);
          memset (&new_str[nonoption_flags_max_len], '\0',
                  top + 1 - nonoption_flags_max_len);
          nonoption_flags_max_len = top + 1;
          __getopt_nonoption_flags = new_str;
        }