complete.c

Linux下的MUD客户端程序

/* complete.c -- filename completion for readline. */

/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library, a library for
   reading lines of text with interactive input and history editing.

   The GNU Readline Library is free software; you can redistribute it
   and/or modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 1, or
   (at your option) any later version.

   The GNU Readline 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 General Public License for more details.

   The GNU General Public License is often shipped with GNU software, and
   is generally kept in a file called COPYING or LICENSE.  If you do not
   have a copy of the license, write to the Free Software Foundation,
   675 Mass Ave, Cambridge, MA 02139, USA. */
#define READLINE_LIBRARY

#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#if !defined (NO_SYS_FILE)
#  include <sys/file.h>
#endif /* !NO_SYS_FILE */

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif /* HAVE_UNISTD_H */

#if defined (HAVE_STDLIB_H)
#  include <stdlib.h>
#else
#  include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */

#include <errno.h>
/* Not all systems declare ERRNO in errno.h... and some systems #define it! */
#if !defined (errno)
extern int errno;
#endif /* !errno */

#include <pwd.h>
#if defined (USG) && !defined (HAVE_GETPW_DECLS)
extern struct passwd *getpwent ();
#endif /* USG && !HAVE_GETPW_DECLS */

/* ISC systems don't define getpwent() if _POSIX_SOURCE is defined. */
#if defined (isc386) && defined (_POSIX_SOURCE)
#  if defined (__STDC__)
extern struct passwd *getpwent (void);
#  else
extern struct passwd *getpwent ();
#  endif /* !__STDC__ */
#endif /* isc386 && _POSIX_SOURCE */

#include "posixstat.h"

/* System-specific feature definitions and include files. */
#include "rldefs.h"

/* Some standard library routines. */
#include "readline.h"

/* Possible values for do_replace in rl_complete_internal. */
#define NO_MATCH	0
#define SINGLE_MATCH	1
#define MULT_MATCH	2

#if !defined (strchr) && !defined (__STDC__)
extern char *strchr (), *strrchr ();
#endif /* !strchr && !__STDC__ */

extern char *tilde_expand ();
extern char *rl_copy_text ();

extern Function *rl_last_func;
extern int rl_editing_mode;
extern int screenwidth;

/* Forward declarations for functions defined and used in this file. */
char *filename_completion_function ();
char **completion_matches ();

static int compare_strings ();
static char *rl_strpbrk ();

#if defined (STATIC_MALLOC)
static char *xmalloc (), *xrealloc ();
#else
extern char *xmalloc (), *xrealloc ();
#endif /* STATIC_MALLOC */

/* If non-zero, then this is the address of a function to call when
   completing on a directory name.  The function is called with
   the address of a string (the current directory name) as an arg. */
Function *rl_directory_completion_hook = (Function *)NULL;

/* Non-zero means readline completion functions perform tilde expansion. */
int rl_complete_with_tilde_expansion = 0;

/* If non-zero, non-unique completions always show the list of matches. */
int _rl_complete_show_all = 0;

#if defined (VISIBLE_STATS)
#  if !defined (X_OK)
#    define X_OK 1
#  endif

static int stat_char ();

/* Non-zero means add an additional character to each filename displayed
   during listing completion iff rl_filename_completion_desired which helps
   to indicate the type of file being listed. */
int rl_visible_stats = 0;
#endif /* VISIBLE_STATS */

/* **************************************************************** */
/*								    */
/*	Completion matching, from readline's point of view.	    */
/*								    */
/* **************************************************************** */

/* Pointer to the generator function for completion_matches ().
   NULL means to use filename_entry_function (), the default filename
   completer. */
Function *rl_completion_entry_function = (Function *)NULL;

/* Pointer to alternative function to create matches.
   Function is called with TEXT, START, and END.
   START and END are indices in RL_LINE_BUFFER saying what the boundaries
   of TEXT are.
   If this function exists and returns NULL then call the value of
   rl_completion_entry_function to try to match, otherwise use the
   array of strings returned. */
CPPFunction *rl_attempted_completion_function = (CPPFunction *)NULL;

/* Non-zero means to suppress normal filename completion after the
   user-specified completion function has been called. */
int rl_attempted_completion_over = 0;

/* Local variable states what happened during the last completion attempt. */
static int completion_changed_buffer = 0;

/* Complete the word at or before point.  You have supplied the function
   that does the initial simple matching selection algorithm (see
   completion_matches ()).  The default is to do filename completion. */

rl_complete (ignore, invoking_key)
     int ignore, invoking_key;
{
  if (rl_last_func == rl_complete && !completion_changed_buffer)
    return (rl_complete_internal ('?'));
  else if (_rl_complete_show_all)
    return (rl_complete_internal ('!'));
  else
    return (rl_complete_internal (TAB));
}

/* List the possible completions.  See description of rl_complete (). */
rl_possible_completions (ignore, invoking_key)
     int ignore, invoking_key;
{
  return (rl_complete_internal ('?'));
}

rl_insert_completions (ignore, invoking_key)
     int ignore, invoking_key;
{
  return (rl_complete_internal ('*'));
}

/* The user must press "y" or "n". Non-zero return means "y" pressed. */
get_y_or_n ()
{
  int c;

  for (;;)
    {
      c = rl_read_key ();
      if (c == 'y' || c == 'Y' || c == ' ')
	return (1);
      if (c == 'n' || c == 'N' || c == RUBOUT)
	return (0);
      if (c == ABORT_CHAR)
	rl_abort ();
      ding ();
    }
}

/* Up to this many items will be displayed in response to a
   possible-completions call.  After that, we ask the user if
   she is sure she wants to see them all. */
int rl_completion_query_items = 100;

/* The basic list of characters that signal a break between words for the
   completer routine.  The contents of this variable is what breaks words
   in the shell, i.e. " \t\n\"\\'`@$><=" */
char *rl_basic_word_break_characters = " \t\n\"\\'`@$><=;|&{(";

/* The list of characters that signal a break between words for
   rl_complete_internal.  The default list is the contents of
   rl_basic_word_break_characters.  */
char *rl_completer_word_break_characters = (char *)NULL;

/* List of characters which can be used to quote a substring of the line.
   Completion occurs on the entire substring, and within the substring
   rl_completer_word_break_characters are treated as any other character,
   unless they also appear within this list. */
char *rl_completer_quote_characters = (char *)NULL;

/* List of characters that are word break characters, but should be left
   in TEXT when it is passed to the completion function.  The shell uses
   this to help determine what kind of completing to do. */
char *rl_special_prefixes = (char *)NULL;

/* If non-zero, then disallow duplicates in the matches. */
int rl_ignore_completion_duplicates = 1;

/* Non-zero means that the results of the matches are to be treated
   as filenames.  This is ALWAYS zero on entry, and can only be changed
   within a completion entry finder function. */
int rl_filename_completion_desired = 0;

/* Non-zero means that the results of the matches are to be quoted using
   double quotes (or an application-specific quoting mechanism) if the
   filename contains any characters in rl_word_break_chars.  This is
   ALWAYS non-zero on entry, and can only be changed within a completion
   entry finder function. */
int rl_filename_quoting_desired = 1;

/* This function, if defined, is called by the completer when real
   filename completion is done, after all the matching names have been
   generated. It is passed a (char**) known as matches in the code below.
   It consists of a NULL-terminated array of pointers to potential
   matching strings.  The 1st element (matches[0]) is the maximal
   substring that is common to all matches. This function can re-arrange
   the list of matches as required, but all elements of the array must be
   free()'d if they are deleted. The main intent of this function is
   to implement FIGNORE a la SunOS csh. */
Function *rl_ignore_some_completions_function = (Function *)NULL;

#if defined (SHELL)
/* A function to strip quotes that are not protected by backquotes.  It
   allows single quotes to appear within double quotes, and vice versa.
   It should be smarter.  It's fairly shell-specific, hence the SHELL
   definition wrapper. */
static char *
_delete_quotes (text)
     char *text;
{
  char *ret, *p, *r;
  int l, quoted;

  l = strlen (text);
  ret = xmalloc (l + 1);
  for (quoted = 0, p = text, r = ret; p && *p; p++)
    {
      /* Allow backslash-quoted characters to pass through unscathed. */
      if (*p == '\\')
        continue;
      /* Close quote. */
      if (quoted && *p == quoted)
	{
	  quoted = 0;
	  continue;
	}
      /* Open quote. */
      if (quoted == 0 && (*p == '\'' || *p == '"'))
	{
	  quoted = *p;
	  continue;
	}
      *r++ = *p;
    }
  *r = '\0';
  return ret;
}
#endif /* SHELL */

/* Return the portion of PATHNAME that should be output when listing
   possible completions.  If we are hacking filename completion, we
   are only interested in the basename, the portion following the
   final slash.  Otherwise, we return what we were passed. */
static char *
printable_part (pathname)
      char *pathname;
{
  char *temp = (char *)NULL;

  if (rl_filename_completion_desired)
    temp = strrchr (pathname, '/');

  if (!temp)
    return (pathname);
  else
    return (++temp);
}

/* Output TO_PRINT to rl_outstream.  If VISIBLE_STATS is defined and we
   are using it, check for and output a single character for `special'
   filenames.  Return 1 if we printed an extension character, 0 if not. */
static int
print_filename (to_print, full_pathname)
     char *to_print, *full_pathname;
{
#if !defined (VISIBLE_STATS)
  fputs (to_print, rl_outstream);
  return 0;
#else  
  char *s, c, *new_full_pathname;
  int extension_char = 0, slen, tlen;

  fputs (to_print, rl_outstream);
  if (rl_filename_completion_desired && rl_visible_stats)
    {
      /* If to_print != full_pathname, to_print is the basename of the
	 path passed.  In this case, we try to expand the directory
	 name before checking for the stat character. */
      if (to_print != full_pathname)
	{
	  /* Terminate the directory name. */
	  c = to_print[-1];
	  to_print[-1] = '\0';

	  s = tilde_expand (full_pathname);
	  if (rl_directory_completion_hook)
	    (*rl_directory_completion_hook) (&s);

	  slen = strlen (s);
	  tlen = strlen (to_print);
	  new_full_pathname = xmalloc (slen + tlen + 2);
	  strcpy (new_full_pathname, s);
	  new_full_pathname[slen] = '/';
	  strcpy (new_full_pathname + slen + 1, to_print);

	  extension_char = stat_char (new_full_pathname);

	  free (new_full_pathname);
	  to_print[-1] = c;
	}
      else
	{
	  s = tilde_expand (full_pathname);
	  extension_char = stat_char (s);
	}

      free (s);
      if (extension_char)
	putc (extension_char, rl_outstream);
      return (extension_char != 0);
    }
  else
    return 0;
#endif /* VISIBLE_STATS */
}

/* Complete the word at or before point.
   WHAT_TO_DO says what to do with the completion.
   `?' means list the possible completions.
   TAB means do standard completion.
   `*' means insert all of the possible completions.
   `!' means to do standard completion, and list all possible completions if
   there is more than one. */
rl_complete_internal (what_to_do)
     int what_to_do;
{
  char **matches;
  Function *our_func;
  int start, scan, end, delimiter = 0, pass_next;
  char *text, *saved_line_buffer;
  char *replacement;
  char quote_char = '\0';
  int found_quote = 0;

  if (rl_line_buffer)
    saved_line_buffer = savestring (rl_line_buffer);
  else
    saved_line_buffer = (char *)NULL;

  if (rl_completion_entry_function)
    our_func = rl_completion_entry_function;
  else
    our_func = (Function *)filename_completion_function;

  /* Only the completion entry function can change these. */
  rl_filename_completion_desired = 0;
  rl_filename_quoting_desired = 1;

  /* We now look backwards for the start of a filename/variable word. */
  end = rl_point;

  if (rl_point)
    {
      if (rl_completer_quote_characters)
	{
	  /* We have a list of characters which can be used in pairs to
	     quote substrings for the completer.  Try to find the start
	     of an unclosed quoted substring. */
	  /* FOUND_QUOTE is set so we know what kind of quotes we found. */
	  for (scan = pass_next = 0; scan < end; scan++)
	    {
	      if (pass_next)
		{
		  pass_next = 0;
		  continue;
		}

	      if (rl_line_buffer[scan] == '\\')
		{
		  pass_next = 1;
		  found_quote |= 4;
		  continue;
		}

	      if (quote_char != '\0')
		{
		  /* Ignore everything until the matching close quote char. */
		  if (rl_line_buffer[scan] == quote_char)
		    {
		      /* Found matching close.  Abandon this substring. */
		      quote_char = '\0';
		      rl_point = end;
		    }
		}
	      else if (strchr (rl_completer_quote_characters, rl_line_buffer[scan]))
		{
		  /* Found start of a quoted substring. */
		  quote_char = rl_line_buffer[scan];
		  rl_point = scan + 1;
		  /* Shell-like quoting conventions. */
		  if (quote_char == '\'')
		    found_quote |= 1;
		  else if (quote_char == '"')
		    found_quote |= 2;
		}
	    }
	}

      if (rl_point == end)
	{
	  int quoted = 0;
	  /* We didn't find an unclosed quoted substring upon which to do
	     completion, so use the word break characters to find the
	     substring on which to complete. */
	  while (--rl_point)
	    {
	      scan = rl_line_buffer[rl_point];

	      if (strchr (rl_completer_word_break_characters, scan) == 0)
		continue;

#if defined (SHELL)
	      /* Don't let word break characters in quoted substrings break
		 words for the completer. */
	      if (found_quote && char_is_quoted (rl_line_buffer, rl_point))
		continue;
#endif /* SHELL */

	      /* Convoluted code, but it avoids an n^2 algorithm with calls
	      	 to char_is_quoted. */
	      break;
	    }
	}

      /* If we are at an unquoted word break, then advance past it. */
      scan = rl_line_buffer[rl_point];
#if defined (SHELL)
      if ((found_quote == 0 || char_is_quoted (rl_line_buffer, rl_point) == 0) &&