1360 lines
32 KiB
C
1360 lines
32 KiB
C
/* histexpand.c -- history expansion. */
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/* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
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This file contains the GNU History Library (the Library), a set of
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routines for managing the text of previously typed lines.
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The Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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The Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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675 Mass Ave, Cambridge, MA 02139, USA. */
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#include <stdio.h>
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#if defined (HAVE_STDLIB_H)
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# include <stdlib.h>
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#else
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#if defined (HAVE_UNISTD_H)
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# ifndef _MINIX
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# include <sys/types.h>
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# endif
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# include <unistd.h>
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#endif
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#if defined (HAVE_STRING_H)
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# include <string.h>
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#else
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# include <strings.h>
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#endif /* !HAVE_STRING_H */
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#include "history.h"
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#include "histlib.h"
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#define HISTORY_WORD_DELIMITERS " \t\n;&()|<>"
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#define HISTORY_QUOTE_CHARACTERS "\"'`"
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static char error_pointer;
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static char *subst_lhs;
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static char *subst_rhs;
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static int subst_lhs_len;
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static int subst_rhs_len;
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static char *get_history_word_specifier ();
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static char *history_find_word ();
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extern int history_offset;
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extern char *single_quote ();
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static char *quote_breaks ();
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extern char *xmalloc (), *xrealloc ();
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/* Variables exported by this file. */
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/* The character that represents the start of a history expansion
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request. This is usually `!'. */
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char history_expansion_char = '!';
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/* The character that invokes word substitution if found at the start of
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a line. This is usually `^'. */
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char history_subst_char = '^';
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/* During tokenization, if this character is seen as the first character
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of a word, then it, and all subsequent characters upto a newline are
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ignored. For a Bourne shell, this should be '#'. Bash special cases
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the interactive comment character to not be a comment delimiter. */
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char history_comment_char = '\0';
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/* The list of characters which inhibit the expansion of text if found
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immediately following history_expansion_char. */
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char *history_no_expand_chars = " \t\n\r=";
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/* If set to a non-zero value, single quotes inhibit history expansion.
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The default is 0. */
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int history_quotes_inhibit_expansion = 0;
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/* If set, this points to a function that is called to verify that a
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particular history expansion should be performed. */
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Function *history_inhibit_expansion_function;
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/* **************************************************************** */
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/* */
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/* History Expansion */
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/* */
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/* **************************************************************** */
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/* Hairy history expansion on text, not tokens. This is of general
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use, and thus belongs in this library. */
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/* The last string searched for by a !?string? search. */
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static char *search_string;
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/* The last string matched by a !?string? search. */
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static char *search_match;
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/* Return the event specified at TEXT + OFFSET modifying OFFSET to
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point to after the event specifier. Just a pointer to the history
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line is returned; NULL is returned in the event of a bad specifier.
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You pass STRING with *INDEX equal to the history_expansion_char that
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begins this specification.
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DELIMITING_QUOTE is a character that is allowed to end the string
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specification for what to search for in addition to the normal
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characters `:', ` ', `\t', `\n', and sometimes `?'.
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So you might call this function like:
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line = get_history_event ("!echo:p", &index, 0); */
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char *
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get_history_event (string, caller_index, delimiting_quote)
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char *string;
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int *caller_index;
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int delimiting_quote;
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{
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register int i;
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register char c;
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HIST_ENTRY *entry;
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int which, sign, local_index, substring_okay;
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Function *search_func;
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char *temp;
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/* The event can be specified in a number of ways.
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!! the previous command
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!n command line N
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!-n current command-line minus N
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!str the most recent command starting with STR
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!?str[?]
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the most recent command containing STR
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All values N are determined via HISTORY_BASE. */
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i = *caller_index;
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if (string[i] != history_expansion_char)
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return ((char *)NULL);
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/* Move on to the specification. */
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i++;
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sign = 1;
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substring_okay = 0;
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#define RETURN_ENTRY(e, w) \
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return ((e = history_get (w)) ? e->line : (char *)NULL)
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/* Handle !! case. */
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if (string[i] == history_expansion_char)
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{
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i++;
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which = history_base + (history_length - 1);
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*caller_index = i;
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RETURN_ENTRY (entry, which);
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}
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/* Hack case of numeric line specification. */
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if (string[i] == '-')
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{
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sign = -1;
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i++;
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}
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if (_rl_digit_p (string[i]))
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{
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/* Get the extent of the digits and compute the value. */
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for (which = 0; _rl_digit_p (string[i]); i++)
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which = (which * 10) + _rl_digit_value (string[i]);
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*caller_index = i;
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if (sign < 0)
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which = (history_length + history_base) - which;
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RETURN_ENTRY (entry, which);
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}
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/* This must be something to search for. If the spec begins with
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a '?', then the string may be anywhere on the line. Otherwise,
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the string must be found at the start of a line. */
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if (string[i] == '?')
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{
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substring_okay++;
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i++;
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}
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/* Only a closing `?' or a newline delimit a substring search string. */
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for (local_index = i; c = string[i]; i++)
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if ((!substring_okay && (whitespace (c) || c == ':' ||
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(history_search_delimiter_chars && member (c, history_search_delimiter_chars)) ||
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string[i] == delimiting_quote)) ||
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string[i] == '\n' ||
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(substring_okay && string[i] == '?'))
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break;
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which = i - local_index;
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temp = xmalloc (1 + which);
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if (which)
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strncpy (temp, string + local_index, which);
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temp[which] = '\0';
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if (substring_okay && string[i] == '?')
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i++;
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*caller_index = i;
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#define FAIL_SEARCH() \
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do { \
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history_offset = history_length; free (temp) ; return (char *)NULL; \
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} while (0)
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/* If there is no search string, try to use the previous search string,
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if one exists. If not, fail immediately. */
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if (*temp == '\0' && substring_okay)
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{
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if (search_string)
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{
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free (temp);
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temp = savestring (search_string);
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}
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else
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FAIL_SEARCH ();
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}
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search_func = substring_okay ? history_search : history_search_prefix;
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while (1)
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{
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local_index = (*search_func) (temp, -1);
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if (local_index < 0)
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FAIL_SEARCH ();
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if (local_index == 0 || substring_okay)
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{
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entry = current_history ();
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history_offset = history_length;
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/* If this was a substring search, then remember the
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string that we matched for word substitution. */
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if (substring_okay)
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{
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FREE (search_string);
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search_string = temp;
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FREE (search_match);
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search_match = history_find_word (entry->line, local_index);
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}
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else
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free (temp);
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return (entry->line);
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}
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if (history_offset)
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history_offset--;
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else
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FAIL_SEARCH ();
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}
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#undef FAIL_SEARCH
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#undef RETURN_ENTRY
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}
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/* Function for extracting single-quoted strings. Used for inhibiting
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history expansion within single quotes. */
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/* Extract the contents of STRING as if it is enclosed in single quotes.
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SINDEX, when passed in, is the offset of the character immediately
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following the opening single quote; on exit, SINDEX is left pointing
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to the closing single quote. */
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static void
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hist_string_extract_single_quoted (string, sindex)
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char *string;
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int *sindex;
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{
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register int i;
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for (i = *sindex; string[i] && string[i] != '\''; i++)
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;
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*sindex = i;
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}
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static char *
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quote_breaks (s)
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char *s;
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{
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register char *p, *r;
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char *ret;
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int len = 3;
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for (p = s; p && *p; p++, len++)
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{
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if (*p == '\'')
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len += 3;
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else if (whitespace (*p) || *p == '\n')
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len += 2;
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}
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r = ret = xmalloc (len);
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*r++ = '\'';
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for (p = s; p && *p; )
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{
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if (*p == '\'')
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{
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*r++ = '\'';
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*r++ = '\\';
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*r++ = '\'';
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*r++ = '\'';
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p++;
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}
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else if (whitespace (*p) || *p == '\n')
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{
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*r++ = '\'';
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*r++ = *p++;
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*r++ = '\'';
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}
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else
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*r++ = *p++;
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}
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*r++ = '\'';
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*r = '\0';
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return ret;
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}
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static char *
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hist_error(s, start, current, errtype)
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char *s;
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int start, current, errtype;
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{
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char *temp, *emsg;
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int ll, elen;
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ll = current - start;
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switch (errtype)
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{
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case EVENT_NOT_FOUND:
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emsg = "event not found";
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elen = 15;
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break;
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case BAD_WORD_SPEC:
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emsg = "bad word specifier";
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elen = 18;
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break;
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case SUBST_FAILED:
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emsg = "substitution failed";
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elen = 19;
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break;
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case BAD_MODIFIER:
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emsg = "unrecognized history modifier";
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elen = 29;
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break;
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case NO_PREV_SUBST:
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emsg = "no previous substitution";
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elen = 24;
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break;
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default:
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emsg = "unknown expansion error";
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elen = 23;
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break;
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}
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temp = xmalloc (ll + elen + 3);
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strncpy (temp, s + start, ll);
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temp[ll] = ':';
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temp[ll + 1] = ' ';
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strcpy (temp + ll + 2, emsg);
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return (temp);
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}
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/* Get a history substitution string from STR starting at *IPTR
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and return it. The length is returned in LENPTR.
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A backslash can quote the delimiter. If the string is the
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empty string, the previous pattern is used. If there is
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no previous pattern for the lhs, the last history search
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string is used.
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If IS_RHS is 1, we ignore empty strings and set the pattern
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to "" anyway. subst_lhs is not changed if the lhs is empty;
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subst_rhs is allowed to be set to the empty string. */
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static char *
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get_subst_pattern (str, iptr, delimiter, is_rhs, lenptr)
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char *str;
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int *iptr, delimiter, is_rhs, *lenptr;
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{
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register int si, i, j, k;
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char *s = (char *) NULL;
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i = *iptr;
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for (si = i; str[si] && str[si] != delimiter; si++)
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if (str[si] == '\\' && str[si + 1] == delimiter)
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si++;
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if (si > i || is_rhs)
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{
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s = xmalloc (si - i + 1);
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for (j = 0, k = i; k < si; j++, k++)
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{
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/* Remove a backslash quoting the search string delimiter. */
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if (str[k] == '\\' && str[k + 1] == delimiter)
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k++;
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s[j] = str[k];
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}
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s[j] = '\0';
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if (lenptr)
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*lenptr = j;
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}
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i = si;
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if (str[i])
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i++;
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*iptr = i;
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return s;
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}
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static void
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postproc_subst_rhs ()
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{
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char *new;
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int i, j, new_size;
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new = xmalloc (new_size = subst_rhs_len + subst_lhs_len);
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for (i = j = 0; i < subst_rhs_len; i++)
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{
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if (subst_rhs[i] == '&')
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{
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if (j + subst_lhs_len >= new_size)
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new = xrealloc (new, (new_size = new_size * 2 + subst_lhs_len));
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strcpy (new + j, subst_lhs);
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j += subst_lhs_len;
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}
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else
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{
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/* a single backslash protects the `&' from lhs interpolation */
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if (subst_rhs[i] == '\\' && subst_rhs[i + 1] == '&')
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i++;
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if (j >= new_size)
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new = xrealloc (new, new_size *= 2);
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new[j++] = subst_rhs[i];
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}
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}
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new[j] = '\0';
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free (subst_rhs);
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subst_rhs = new;
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subst_rhs_len = j;
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}
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/* Expand the bulk of a history specifier starting at STRING[START].
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Returns 0 if everything is OK, -1 if an error occurred, and 1
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if the `p' modifier was supplied and the caller should just print
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the returned string. Returns the new index into string in
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*END_INDEX_PTR, and the expanded specifier in *RET_STRING. */
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static int
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history_expand_internal (string, start, end_index_ptr, ret_string, current_line)
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char *string;
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int start, *end_index_ptr;
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char **ret_string;
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char *current_line; /* for !# */
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{
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int i, n, starting_index;
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int substitute_globally, want_quotes, print_only;
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char *event, *temp, *result, *tstr, *t, c, *word_spec;
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int result_len;
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result = xmalloc (result_len = 128);
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i = start;
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/* If it is followed by something that starts a word specifier,
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then !! is implied as the event specifier. */
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if (member (string[i + 1], ":$*%^"))
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{
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char fake_s[3];
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int fake_i = 0;
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i++;
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fake_s[0] = fake_s[1] = history_expansion_char;
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fake_s[2] = '\0';
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event = get_history_event (fake_s, &fake_i, 0);
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}
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else if (string[i + 1] == '#')
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{
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i += 2;
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event = current_line;
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}
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else
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{
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int quoted_search_delimiter = 0;
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/* If the character before this `!' is a double or single
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quote, then this expansion takes place inside of the
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quoted string. If we have to search for some text ("!foo"),
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allow the delimiter to end the search string. */
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if (i && (string[i - 1] == '\'' || string[i - 1] == '"'))
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quoted_search_delimiter = string[i - 1];
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event = get_history_event (string, &i, quoted_search_delimiter);
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}
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if (event == 0)
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{
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*ret_string = hist_error (string, start, i, EVENT_NOT_FOUND);
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free (result);
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return (-1);
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}
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/* If a word specifier is found, then do what that requires. */
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starting_index = i;
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word_spec = get_history_word_specifier (string, event, &i);
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/* There is no such thing as a `malformed word specifier'. However,
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it is possible for a specifier that has no match. In that case,
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we complain. */
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if (word_spec == (char *)&error_pointer)
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{
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*ret_string = hist_error (string, starting_index, i, BAD_WORD_SPEC);
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free (result);
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return (-1);
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}
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/* If no word specifier, than the thing of interest was the event. */
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temp = word_spec ? savestring (word_spec) : savestring (event);
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FREE (word_spec);
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/* Perhaps there are other modifiers involved. Do what they say. */
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want_quotes = substitute_globally = print_only = 0;
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starting_index = i;
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while (string[i] == ':')
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{
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c = string[i + 1];
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if (c == 'g')
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{
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substitute_globally = 1;
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i++;
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c = string[i + 1];
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}
|
|
|
|
switch (c)
|
|
{
|
|
default:
|
|
*ret_string = hist_error (string, i+1, i+2, BAD_MODIFIER);
|
|
free (result);
|
|
free (temp);
|
|
return -1;
|
|
|
|
case 'q':
|
|
want_quotes = 'q';
|
|
break;
|
|
|
|
case 'x':
|
|
want_quotes = 'x';
|
|
break;
|
|
|
|
/* :p means make this the last executed line. So we
|
|
return an error state after adding this line to the
|
|
history. */
|
|
case 'p':
|
|
print_only++;
|
|
break;
|
|
|
|
/* :t discards all but the last part of the pathname. */
|
|
case 't':
|
|
tstr = strrchr (temp, '/');
|
|
if (tstr)
|
|
{
|
|
tstr++;
|
|
t = savestring (tstr);
|
|
free (temp);
|
|
temp = t;
|
|
}
|
|
break;
|
|
|
|
/* :h discards the last part of a pathname. */
|
|
case 'h':
|
|
tstr = strrchr (temp, '/');
|
|
if (tstr)
|
|
*tstr = '\0';
|
|
break;
|
|
|
|
/* :r discards the suffix. */
|
|
case 'r':
|
|
tstr = strrchr (temp, '.');
|
|
if (tstr)
|
|
*tstr = '\0';
|
|
break;
|
|
|
|
/* :e discards everything but the suffix. */
|
|
case 'e':
|
|
tstr = strrchr (temp, '.');
|
|
if (tstr)
|
|
{
|
|
t = savestring (tstr);
|
|
free (temp);
|
|
temp = t;
|
|
}
|
|
break;
|
|
|
|
/* :s/this/that substitutes `that' for the first
|
|
occurrence of `this'. :gs/this/that substitutes `that'
|
|
for each occurrence of `this'. :& repeats the last
|
|
substitution. :g& repeats the last substitution
|
|
globally. */
|
|
|
|
case '&':
|
|
case 's':
|
|
{
|
|
char *new_event, *t;
|
|
int delimiter, failed, si, l_temp;
|
|
|
|
if (c == 's')
|
|
{
|
|
if (i + 2 < (int)strlen (string))
|
|
delimiter = string[i + 2];
|
|
else
|
|
break; /* no search delimiter */
|
|
|
|
i += 3;
|
|
|
|
t = get_subst_pattern (string, &i, delimiter, 0, &subst_lhs_len);
|
|
/* An empty substitution lhs with no previous substitution
|
|
uses the last search string as the lhs. */
|
|
if (t)
|
|
{
|
|
FREE (subst_lhs);
|
|
subst_lhs = t;
|
|
}
|
|
else if (!subst_lhs)
|
|
{
|
|
if (search_string && *search_string)
|
|
{
|
|
subst_lhs = savestring (search_string);
|
|
subst_lhs_len = strlen (subst_lhs);
|
|
}
|
|
else
|
|
{
|
|
subst_lhs = (char *) NULL;
|
|
subst_lhs_len = 0;
|
|
}
|
|
}
|
|
|
|
FREE (subst_rhs);
|
|
subst_rhs = get_subst_pattern (string, &i, delimiter, 1, &subst_rhs_len);
|
|
|
|
/* If `&' appears in the rhs, it's supposed to be replaced
|
|
with the lhs. */
|
|
if (member ('&', subst_rhs))
|
|
postproc_subst_rhs ();
|
|
}
|
|
else
|
|
i += 2;
|
|
|
|
/* If there is no lhs, the substitution can't succeed. */
|
|
if (subst_lhs_len == 0)
|
|
{
|
|
*ret_string = hist_error (string, starting_index, i, NO_PREV_SUBST);
|
|
free (result);
|
|
free (temp);
|
|
return -1;
|
|
}
|
|
|
|
l_temp = strlen (temp);
|
|
/* Ignore impossible cases. */
|
|
if (subst_lhs_len > l_temp)
|
|
{
|
|
*ret_string = hist_error (string, starting_index, i, SUBST_FAILED);
|
|
free (result);
|
|
free (temp);
|
|
return (-1);
|
|
}
|
|
|
|
/* Find the first occurrence of THIS in TEMP. */
|
|
si = 0;
|
|
for (failed = 1; (si + subst_lhs_len) <= l_temp; si++)
|
|
if (STREQN (temp+si, subst_lhs, subst_lhs_len))
|
|
{
|
|
int len = subst_rhs_len - subst_lhs_len + l_temp;
|
|
new_event = xmalloc (1 + len);
|
|
strncpy (new_event, temp, si);
|
|
strncpy (new_event + si, subst_rhs, subst_rhs_len);
|
|
strncpy (new_event + si + subst_rhs_len,
|
|
temp + si + subst_lhs_len,
|
|
l_temp - (si + subst_lhs_len));
|
|
new_event[len] = '\0';
|
|
free (temp);
|
|
temp = new_event;
|
|
|
|
failed = 0;
|
|
|
|
if (substitute_globally)
|
|
{
|
|
si += subst_rhs_len;
|
|
l_temp = strlen (temp);
|
|
substitute_globally++;
|
|
continue;
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (substitute_globally > 1)
|
|
{
|
|
substitute_globally = 0;
|
|
continue; /* don't want to increment i */
|
|
}
|
|
|
|
if (failed == 0)
|
|
continue; /* don't want to increment i */
|
|
|
|
*ret_string = hist_error (string, starting_index, i, SUBST_FAILED);
|
|
free (result);
|
|
free (temp);
|
|
return (-1);
|
|
}
|
|
}
|
|
i += 2;
|
|
}
|
|
/* Done with modfiers. */
|
|
/* Believe it or not, we have to back the pointer up by one. */
|
|
--i;
|
|
|
|
if (want_quotes)
|
|
{
|
|
char *x;
|
|
|
|
if (want_quotes == 'q')
|
|
x = single_quote (temp);
|
|
else if (want_quotes == 'x')
|
|
x = quote_breaks (temp);
|
|
else
|
|
x = savestring (temp);
|
|
|
|
free (temp);
|
|
temp = x;
|
|
}
|
|
|
|
n = strlen (temp);
|
|
if (n >= result_len)
|
|
result = xrealloc (result, n + 2);
|
|
strcpy (result, temp);
|
|
free (temp);
|
|
|
|
*end_index_ptr = i;
|
|
*ret_string = result;
|
|
return (print_only);
|
|
}
|
|
|
|
/* Expand the string STRING, placing the result into OUTPUT, a pointer
|
|
to a string. Returns:
|
|
|
|
-1) If there was an error in expansion.
|
|
0) If no expansions took place (or, if the only change in
|
|
the text was the de-slashifying of the history expansion
|
|
character)
|
|
1) If expansions did take place
|
|
2) If the `p' modifier was given and the caller should print the result
|
|
|
|
If an error ocurred in expansion, then OUTPUT contains a descriptive
|
|
error message. */
|
|
|
|
#define ADD_STRING(s) \
|
|
do \
|
|
{ \
|
|
int sl = strlen (s); \
|
|
j += sl; \
|
|
if (j >= result_len) \
|
|
{ \
|
|
while (j >= result_len) \
|
|
result_len += 128; \
|
|
result = xrealloc (result, result_len); \
|
|
} \
|
|
strcpy (result + j - sl, s); \
|
|
} \
|
|
while (0)
|
|
|
|
#define ADD_CHAR(c) \
|
|
do \
|
|
{ \
|
|
if (j >= result_len - 1) \
|
|
result = xrealloc (result, result_len += 64); \
|
|
result[j++] = c; \
|
|
result[j] = '\0'; \
|
|
} \
|
|
while (0)
|
|
|
|
int
|
|
history_expand (hstring, output)
|
|
char *hstring;
|
|
char **output;
|
|
{
|
|
register int j;
|
|
int i, r, l, passc, cc, modified, eindex, only_printing;
|
|
char *string;
|
|
|
|
/* The output string, and its length. */
|
|
int result_len;
|
|
char *result;
|
|
|
|
/* Used when adding the string. */
|
|
char *temp;
|
|
|
|
/* Setting the history expansion character to 0 inhibits all
|
|
history expansion. */
|
|
if (history_expansion_char == 0)
|
|
{
|
|
*output = savestring (hstring);
|
|
return (0);
|
|
}
|
|
|
|
/* Prepare the buffer for printing error messages. */
|
|
result = xmalloc (result_len = 256);
|
|
result[0] = '\0';
|
|
|
|
only_printing = modified = 0;
|
|
l = strlen (hstring);
|
|
|
|
/* Grovel the string. Only backslash and single quotes can quote the
|
|
history escape character. We also handle arg specifiers. */
|
|
|
|
/* Before we grovel forever, see if the history_expansion_char appears
|
|
anywhere within the text. */
|
|
|
|
/* The quick substitution character is a history expansion all right. That
|
|
is to say, "^this^that^" is equivalent to "!!:s^this^that^", and in fact,
|
|
that is the substitution that we do. */
|
|
if (hstring[0] == history_subst_char)
|
|
{
|
|
string = xmalloc (l + 5);
|
|
|
|
string[0] = string[1] = history_expansion_char;
|
|
string[2] = ':';
|
|
string[3] = 's';
|
|
strcpy (string + 4, hstring);
|
|
l += 4;
|
|
}
|
|
else
|
|
{
|
|
string = hstring;
|
|
/* If not quick substitution, still maybe have to do expansion. */
|
|
|
|
/* `!' followed by one of the characters in history_no_expand_chars
|
|
is NOT an expansion. */
|
|
for (i = 0; string[i]; i++)
|
|
{
|
|
cc = string[i + 1];
|
|
/* The history_comment_char, if set, appearing that the beginning
|
|
of a word signifies that the rest of the line should not have
|
|
history expansion performed on it.
|
|
Skip the rest of the line and break out of the loop. */
|
|
if (history_comment_char && string[i] == history_comment_char &&
|
|
(i == 0 || member (string[i - 1], HISTORY_WORD_DELIMITERS)))
|
|
{
|
|
while (string[i])
|
|
i++;
|
|
break;
|
|
}
|
|
else if (string[i] == history_expansion_char)
|
|
{
|
|
if (!cc || member (cc, history_no_expand_chars))
|
|
continue;
|
|
/* If the calling application has set
|
|
history_inhibit_expansion_function to a function that checks
|
|
for special cases that should not be history expanded,
|
|
call the function and skip the expansion if it returns a
|
|
non-zero value. */
|
|
else if (history_inhibit_expansion_function &&
|
|
(*history_inhibit_expansion_function) (string, i))
|
|
continue;
|
|
else
|
|
break;
|
|
}
|
|
/* XXX - at some point, might want to extend this to handle
|
|
double quotes as well. */
|
|
else if (history_quotes_inhibit_expansion && string[i] == '\'')
|
|
{
|
|
/* If this is bash, single quotes inhibit history expansion. */
|
|
i++;
|
|
hist_string_extract_single_quoted (string, &i);
|
|
}
|
|
else if (history_quotes_inhibit_expansion && string[i] == '\\')
|
|
{
|
|
/* If this is bash, allow backslashes to quote single
|
|
quotes and the history expansion character. */
|
|
if (cc == '\'' || cc == history_expansion_char)
|
|
i++;
|
|
}
|
|
}
|
|
|
|
if (string[i] != history_expansion_char)
|
|
{
|
|
free (result);
|
|
*output = savestring (string);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/* Extract and perform the substitution. */
|
|
for (passc = i = j = 0; i < l; i++)
|
|
{
|
|
int tchar = string[i];
|
|
|
|
if (passc)
|
|
{
|
|
passc = 0;
|
|
ADD_CHAR (tchar);
|
|
continue;
|
|
}
|
|
|
|
if (tchar == history_expansion_char)
|
|
tchar = -3;
|
|
else if (tchar == history_comment_char)
|
|
tchar = -2;
|
|
|
|
switch (tchar)
|
|
{
|
|
default:
|
|
ADD_CHAR (string[i]);
|
|
break;
|
|
|
|
case '\\':
|
|
passc++;
|
|
ADD_CHAR (tchar);
|
|
break;
|
|
|
|
case '\'':
|
|
{
|
|
/* If history_quotes_inhibit_expansion is set, single quotes
|
|
inhibit history expansion. */
|
|
if (history_quotes_inhibit_expansion)
|
|
{
|
|
int quote, slen;
|
|
|
|
quote = i++;
|
|
hist_string_extract_single_quoted (string, &i);
|
|
|
|
slen = i - quote + 2;
|
|
temp = xmalloc (slen);
|
|
strncpy (temp, string + quote, slen);
|
|
temp[slen - 1] = '\0';
|
|
ADD_STRING (temp);
|
|
free (temp);
|
|
}
|
|
else
|
|
ADD_CHAR (string[i]);
|
|
break;
|
|
}
|
|
|
|
case -2: /* history_comment_char */
|
|
if (i == 0 || member (string[i - 1], HISTORY_WORD_DELIMITERS))
|
|
{
|
|
temp = xmalloc (l - i + 1);
|
|
strcpy (temp, string + i);
|
|
ADD_STRING (temp);
|
|
free (temp);
|
|
i = l;
|
|
}
|
|
else
|
|
ADD_CHAR (string[i]);
|
|
break;
|
|
|
|
case -3: /* history_expansion_char */
|
|
cc = string[i + 1];
|
|
|
|
/* If the history_expansion_char is followed by one of the
|
|
characters in history_no_expand_chars, then it is not a
|
|
candidate for expansion of any kind. */
|
|
if (member (cc, history_no_expand_chars))
|
|
{
|
|
ADD_CHAR (string[i]);
|
|
break;
|
|
}
|
|
|
|
#if defined (NO_BANG_HASH_MODIFIERS)
|
|
/* There is something that is listed as a `word specifier' in csh
|
|
documentation which means `the expanded text to this point'.
|
|
That is not a word specifier, it is an event specifier. If we
|
|
don't want to allow modifiers with `!#', just stick the current
|
|
output line in again. */
|
|
if (cc == '#')
|
|
{
|
|
if (result)
|
|
{
|
|
temp = xmalloc (1 + strlen (result));
|
|
strcpy (temp, result);
|
|
ADD_STRING (temp);
|
|
free (temp);
|
|
}
|
|
i++;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
r = history_expand_internal (string, i, &eindex, &temp, result);
|
|
if (r < 0)
|
|
{
|
|
*output = temp;
|
|
free (result);
|
|
if (string != hstring)
|
|
free (string);
|
|
return -1;
|
|
}
|
|
else
|
|
{
|
|
if (temp)
|
|
{
|
|
modified++;
|
|
if (*temp)
|
|
ADD_STRING (temp);
|
|
free (temp);
|
|
}
|
|
only_printing = r == 1;
|
|
i = eindex;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
*output = result;
|
|
if (string != hstring)
|
|
free (string);
|
|
|
|
if (only_printing)
|
|
{
|
|
add_history (result);
|
|
return (2);
|
|
}
|
|
|
|
return (modified != 0);
|
|
}
|
|
|
|
/* Return a consed string which is the word specified in SPEC, and found
|
|
in FROM. NULL is returned if there is no spec. The address of
|
|
ERROR_POINTER is returned if the word specified cannot be found.
|
|
CALLER_INDEX is the offset in SPEC to start looking; it is updated
|
|
to point to just after the last character parsed. */
|
|
static char *
|
|
get_history_word_specifier (spec, from, caller_index)
|
|
char *spec, *from;
|
|
int *caller_index;
|
|
{
|
|
register int i = *caller_index;
|
|
int first, last;
|
|
int expecting_word_spec = 0;
|
|
char *result;
|
|
|
|
/* The range of words to return doesn't exist yet. */
|
|
first = last = 0;
|
|
result = (char *)NULL;
|
|
|
|
/* If we found a colon, then this *must* be a word specification. If
|
|
it isn't, then it is an error. */
|
|
if (spec[i] == ':')
|
|
{
|
|
i++;
|
|
expecting_word_spec++;
|
|
}
|
|
|
|
/* Handle special cases first. */
|
|
|
|
/* `%' is the word last searched for. */
|
|
if (spec[i] == '%')
|
|
{
|
|
*caller_index = i + 1;
|
|
return (search_match ? savestring (search_match) : savestring (""));
|
|
}
|
|
|
|
/* `*' matches all of the arguments, but not the command. */
|
|
if (spec[i] == '*')
|
|
{
|
|
*caller_index = i + 1;
|
|
result = history_arg_extract (1, '$', from);
|
|
return (result ? result : savestring (""));
|
|
}
|
|
|
|
/* `$' is last arg. */
|
|
if (spec[i] == '$')
|
|
{
|
|
*caller_index = i + 1;
|
|
return (history_arg_extract ('$', '$', from));
|
|
}
|
|
|
|
/* Try to get FIRST and LAST figured out. */
|
|
|
|
if (spec[i] == '-')
|
|
first = 0;
|
|
else if (spec[i] == '^')
|
|
first = 1;
|
|
else if (_rl_digit_p (spec[i]) && expecting_word_spec)
|
|
{
|
|
for (first = 0; _rl_digit_p (spec[i]); i++)
|
|
first = (first * 10) + _rl_digit_value (spec[i]);
|
|
}
|
|
else
|
|
return ((char *)NULL); /* no valid `first' for word specifier */
|
|
|
|
if (spec[i] == '^' || spec[i] == '*')
|
|
{
|
|
last = (spec[i] == '^') ? 1 : '$'; /* x* abbreviates x-$ */
|
|
i++;
|
|
}
|
|
else if (spec[i] != '-')
|
|
last = first;
|
|
else
|
|
{
|
|
i++;
|
|
|
|
if (_rl_digit_p (spec[i]))
|
|
{
|
|
for (last = 0; _rl_digit_p (spec[i]); i++)
|
|
last = (last * 10) + _rl_digit_value (spec[i]);
|
|
}
|
|
else if (spec[i] == '$')
|
|
{
|
|
i++;
|
|
last = '$';
|
|
}
|
|
else if (!spec[i] || spec[i] == ':') /* could be modifier separator */
|
|
last = -1; /* x- abbreviates x-$ omitting word `$' */
|
|
}
|
|
|
|
*caller_index = i;
|
|
|
|
if (last >= first || last == '$' || last < 0)
|
|
result = history_arg_extract (first, last, from);
|
|
|
|
return (result ? result : (char *)&error_pointer);
|
|
}
|
|
|
|
/* Extract the args specified, starting at FIRST, and ending at LAST.
|
|
The args are taken from STRING. If either FIRST or LAST is < 0,
|
|
then make that arg count from the right (subtract from the number of
|
|
tokens, so that FIRST = -1 means the next to last token on the line).
|
|
If LAST is `$' the last arg from STRING is used. */
|
|
char *
|
|
history_arg_extract (first, last, string)
|
|
int first, last;
|
|
char *string;
|
|
{
|
|
register int i, len;
|
|
char *result;
|
|
int size, offset;
|
|
char **list;
|
|
|
|
/* XXX - think about making history_tokenize return a struct array,
|
|
each struct in array being a string and a length to avoid the
|
|
calls to strlen below. */
|
|
if ((list = history_tokenize (string)) == NULL)
|
|
return ((char *)NULL);
|
|
|
|
for (len = 0; list[len]; len++)
|
|
;
|
|
|
|
if (last < 0)
|
|
last = len + last - 1;
|
|
|
|
if (first < 0)
|
|
first = len + first - 1;
|
|
|
|
if (last == '$')
|
|
last = len - 1;
|
|
|
|
if (first == '$')
|
|
first = len - 1;
|
|
|
|
last++;
|
|
|
|
if (first >= len || last > len || first < 0 || last < 0 || first > last)
|
|
result = ((char *)NULL);
|
|
else
|
|
{
|
|
for (size = 0, i = first; i < last; i++)
|
|
size += strlen (list[i]) + 1;
|
|
result = xmalloc (size + 1);
|
|
result[0] = '\0';
|
|
|
|
for (i = first, offset = 0; i < last; i++)
|
|
{
|
|
strcpy (result + offset, list[i]);
|
|
offset += strlen (list[i]);
|
|
if (i + 1 < last)
|
|
{
|
|
result[offset++] = ' ';
|
|
result[offset] = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < len; i++)
|
|
free (list[i]);
|
|
free (list);
|
|
|
|
return (result);
|
|
}
|
|
|
|
#define slashify_in_quotes "\\`\"$"
|
|
|
|
/* Parse STRING into tokens and return an array of strings. If WIND is
|
|
not -1 and INDP is not null, we also want the word surrounding index
|
|
WIND. The position in the returned array of strings is returned in
|
|
*INDP. */
|
|
static char **
|
|
history_tokenize_internal (string, wind, indp)
|
|
char *string;
|
|
int wind, *indp;
|
|
{
|
|
char **result;
|
|
register int i, start, result_index, size;
|
|
int len, delimiter;
|
|
|
|
/* Get a token, and stuff it into RESULT. The tokens are split
|
|
exactly where the shell would split them. */
|
|
for (i = result_index = size = 0, result = (char **)NULL; string[i]; )
|
|
{
|
|
delimiter = 0;
|
|
|
|
/* Skip leading whitespace. */
|
|
for (; string[i] && whitespace (string[i]); i++)
|
|
;
|
|
if (string[i] == 0 || string[i] == history_comment_char)
|
|
return (result);
|
|
|
|
start = i;
|
|
|
|
if (member (string[i], "()\n"))
|
|
{
|
|
i++;
|
|
goto got_token;
|
|
}
|
|
|
|
if (member (string[i], "<>;&|$"))
|
|
{
|
|
int peek = string[i + 1];
|
|
|
|
if (peek == string[i] && peek != '$')
|
|
{
|
|
if (peek == '<' && string[i + 2] == '-')
|
|
i++;
|
|
i += 2;
|
|
goto got_token;
|
|
}
|
|
else
|
|
{
|
|
if ((peek == '&' && (string[i] == '>' || string[i] == '<')) ||
|
|
((peek == '>') && (string[i] == '&')) ||
|
|
((peek == '(') && (string[i] == '$')))
|
|
{
|
|
i += 2;
|
|
goto got_token;
|
|
}
|
|
}
|
|
if (string[i] != '$')
|
|
{
|
|
i++;
|
|
goto got_token;
|
|
}
|
|
}
|
|
|
|
/* Get word from string + i; */
|
|
|
|
if (member (string[i], HISTORY_QUOTE_CHARACTERS))
|
|
delimiter = string[i++];
|
|
|
|
for (; string[i]; i++)
|
|
{
|
|
if (string[i] == '\\' && string[i + 1] == '\n')
|
|
{
|
|
i++;
|
|
continue;
|
|
}
|
|
|
|
if (string[i] == '\\' && delimiter != '\'' &&
|
|
(delimiter != '"' || member (string[i], slashify_in_quotes)))
|
|
{
|
|
i++;
|
|
continue;
|
|
}
|
|
|
|
if (delimiter && string[i] == delimiter)
|
|
{
|
|
delimiter = 0;
|
|
continue;
|
|
}
|
|
|
|
if (!delimiter && (member (string[i], HISTORY_WORD_DELIMITERS)))
|
|
break;
|
|
|
|
if (!delimiter && member (string[i], HISTORY_QUOTE_CHARACTERS))
|
|
delimiter = string[i];
|
|
}
|
|
|
|
got_token:
|
|
|
|
/* If we are looking for the word in which the character at a
|
|
particular index falls, remember it. */
|
|
if (indp && wind != -1 && wind >= start && wind < i)
|
|
*indp = result_index;
|
|
|
|
len = i - start;
|
|
if (result_index + 2 >= size)
|
|
result = (char **)xrealloc (result, ((size += 10) * sizeof (char *)));
|
|
result[result_index] = xmalloc (1 + len);
|
|
strncpy (result[result_index], string + start, len);
|
|
result[result_index][len] = '\0';
|
|
result[++result_index] = (char *)NULL;
|
|
}
|
|
|
|
return (result);
|
|
}
|
|
|
|
/* Return an array of tokens, much as the shell might. The tokens are
|
|
parsed out of STRING. */
|
|
char **
|
|
history_tokenize (string)
|
|
char *string;
|
|
{
|
|
return (history_tokenize_internal (string, -1, (int *)NULL));
|
|
}
|
|
|
|
/* Find and return the word which contains the character at index IND
|
|
in the history line LINE. Used to save the word matched by the
|
|
last history !?string? search. */
|
|
static char *
|
|
history_find_word (line, ind)
|
|
char *line;
|
|
int ind;
|
|
{
|
|
char **words, *s;
|
|
int i, wind;
|
|
|
|
words = history_tokenize_internal (line, ind, &wind);
|
|
if (wind == -1)
|
|
return ((char *)NULL);
|
|
s = words[wind];
|
|
for (i = 0; i < wind; i++)
|
|
free (words[i]);
|
|
for (i = wind + 1; words[i]; i++)
|
|
free (words[i]);
|
|
free (words);
|
|
return s;
|
|
}
|