2697 lines
68 KiB
Plaintext
2697 lines
68 KiB
Plaintext
/* Yacc grammar for bash. */
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/* Copyright (C) 1989 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 1, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with Bash; see the file LICENSE. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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%{
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#include <stdio.h>
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#include <sys/types.h>
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#include <signal.h>
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#include "shell.h"
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#include "flags.h"
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#if defined (READLINE)
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#include <readline/readline.h>
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#endif /* READLINE */
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#include <readline/history.h>
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#if defined (JOB_CONTROL)
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# include "jobs.h"
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#endif /* JOB_CONTROL */
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#define YYDEBUG 1
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extern int eof_encountered;
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extern int no_line_editing;
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extern int interactive, interactive_shell;
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/* **************************************************************** */
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/* */
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/* "Forward" declarations */
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/* */
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/* **************************************************************** */
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/* This is kind of sickening. In order to let these variables be seen by
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all the functions that need them, I am forced to place their declarations
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far away from the place where they should logically be found. */
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static int reserved_word_acceptable ();
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/* PROMPT_STRING_POINTER points to one of these, never to an actual string. */
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char *ps1_prompt, *ps2_prompt;
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/* Handle on the current prompt string. Indirectly points through
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ps1_ or ps2_prompt. */
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char **prompt_string_pointer = (char **)NULL;
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char *current_prompt_string;
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/* The number of lines read from input while creating the current command. */
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int current_command_line_count = 0;
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/* Variables to manage the task of reading here documents, because we need to
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defer the reading until after a complete command has been collected. */
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REDIRECT *redirection_needing_here_doc = (REDIRECT *)NULL;
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int need_here_doc = 0;
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%}
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%union {
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WORD_DESC *word; /* the word that we read. */
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int number; /* the number that we read. */
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WORD_LIST *word_list;
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COMMAND *command;
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REDIRECT *redirect;
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ELEMENT element;
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PATTERN_LIST *pattern;
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}
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/* Reserved words. Members of the first group are only recognized
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in the case that they are preceded by a list_terminator. Members
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of the second group are recognized only under special circumstances. */
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%token IF THEN ELSE ELIF FI CASE ESAC FOR WHILE UNTIL DO DONE FUNCTION
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%token IN BANG
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/* More general tokens. yylex () knows how to make these. */
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%token <word> WORD
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%token <number> NUMBER
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%token AND_AND OR_OR GREATER_GREATER LESS_LESS LESS_AND
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%token GREATER_AND SEMI_SEMI LESS_LESS_MINUS AND_GREATER LESS_GREATER
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%token GREATER_BAR
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/* The types that the various syntactical units return. */
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%type <command> inputunit command pipeline
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%type <command> list list0 list1 simple_list simple_list1
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%type <command> simple_command shell_command_1 shell_command
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%type <command> group_command if_command elif_clause
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%type <redirect> redirection redirections
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%type <element> simple_command_element
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%type <word_list> words pattern
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%type <pattern> pattern_list case_clause_sequence case_clause_1 pattern_list_1
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%start inputunit
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%left '&' ';' '\n' yacc_EOF
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%left AND_AND OR_OR
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%right '|'
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%%
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inputunit: simple_list '\n'
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{
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/* Case of regular command. Discard the error
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safety net,and return the command just parsed. */
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global_command = $1;
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eof_encountered = 0;
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discard_parser_constructs (0);
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YYACCEPT;
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}
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| '\n'
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{
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/* Case of regular command, but not a very
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interesting one. Return a NULL command. */
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global_command = (COMMAND *)NULL;
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YYACCEPT;
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}
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error '\n'
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{
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/* Error during parsing. Return NULL command. */
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global_command = (COMMAND *)NULL;
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eof_encountered = 0;
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discard_parser_constructs (1);
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if (interactive)
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{
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YYACCEPT;
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}
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else
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{
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YYABORT;
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}
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}
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| yacc_EOF
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{
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/* Case of EOF seen by itself. Do ignoreeof or
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not. */
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global_command = (COMMAND *)NULL;
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handle_eof_input_unit ();
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YYACCEPT;
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}
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;
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words:
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{ $$ = (WORD_LIST *)NULL; }
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| words WORD
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{ $$ = make_word_list ($2, $1); }
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;
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redirection: '>' WORD
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{ $$ = make_redirection ( 1, r_output_direction, $2); }
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| '<' WORD
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{ $$ = make_redirection ( 0, r_input_direction, $2); }
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| NUMBER '>' WORD
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{ $$ = make_redirection ($1, r_output_direction, $3); }
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| NUMBER '<' WORD
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{ $$ = make_redirection ($1, r_input_direction, $3); }
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| GREATER_GREATER WORD
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{ $$ = make_redirection ( 1, r_appending_to, $2); }
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| NUMBER GREATER_GREATER WORD
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{ $$ = make_redirection ($1, r_appending_to, $3); }
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| LESS_LESS WORD
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{
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$$ = make_redirection ( 0, r_reading_until, $2);
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redirection_needing_here_doc = $$;
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need_here_doc = 1;
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}
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| NUMBER LESS_LESS WORD
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{
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$$ = make_redirection ($1, r_reading_until, $3);
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redirection_needing_here_doc = $$;
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need_here_doc = 1;
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}
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| LESS_AND NUMBER
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{
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$$ = make_redirection ( 0, r_duplicating_input, $2);
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}
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| NUMBER LESS_AND NUMBER
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{
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$$ = make_redirection ($1, r_duplicating_input, $3);
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}
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| GREATER_AND NUMBER
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{
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$$ = make_redirection ( 1, r_duplicating_output, $2);
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}
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| NUMBER GREATER_AND NUMBER
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{
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$$ = make_redirection ($1, r_duplicating_output, $3);
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}
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| LESS_AND WORD
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{
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$$ = make_redirection
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(0, r_duplicating_input_word, $2);
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}
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| NUMBER LESS_AND WORD
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{
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$$ = make_redirection
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($1, r_duplicating_input_word, $3);
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}
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| GREATER_AND WORD
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{
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$$ = make_redirection
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(1, r_duplicating_output_word, $2);
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}
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| NUMBER GREATER_AND WORD
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{
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$$ = make_redirection
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($1, r_duplicating_output_word, $3);
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}
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| LESS_LESS_MINUS WORD
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{
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$$ = make_redirection
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(0, r_deblank_reading_until, $2);
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redirection_needing_here_doc = $$;
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need_here_doc = 1;
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}
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| NUMBER LESS_LESS_MINUS WORD
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{
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$$ = make_redirection
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($1, r_deblank_reading_until, $3);
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redirection_needing_here_doc = $$;
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need_here_doc = 1;
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}
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| GREATER_AND '-'
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{ $$ = make_redirection ( 1, r_close_this, 0); }
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| NUMBER GREATER_AND '-'
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{ $$ = make_redirection ($1, r_close_this, 0); }
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| LESS_AND '-'
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{ $$ = make_redirection ( 0, r_close_this, 0); }
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| NUMBER LESS_AND '-'
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{ $$ = make_redirection ($1, r_close_this, 0); }
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| AND_GREATER WORD
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{ $$ = make_redirection ( 1, r_err_and_out, $2); }
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| NUMBER LESS_GREATER WORD
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{ $$ = make_redirection ( $1, r_input_output, $3); }
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| LESS_GREATER WORD
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{
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REDIRECT *t1, *t2;
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extern WORD_DESC *copy_word ();
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t1 = make_redirection ( 0, r_input_direction, $2);
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t2 = make_redirection ( 1, r_output_direction, copy_word ($2));
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t1->next = t2;
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$$ = t1;
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}
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| GREATER_BAR WORD
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{ $$ = make_redirection ( 1, r_output_force, $2); }
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| NUMBER GREATER_BAR WORD
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{ $$ = make_redirection ( $1, r_output_force, $3); }
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;
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simple_command_element: WORD
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{ $$.word = $1; $$.redirect = 0; }
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| redirection
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{ $$.redirect = $1; $$.word = 0; }
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;
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redirections: redirection
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{
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$$ = $1;
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}
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| redirections redirection
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{
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register REDIRECT *t = $1;
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while (t->next)
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t = t->next;
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t->next = $2;
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$$ = $1;
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}
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;
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simple_command: simple_command_element
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{ $$ = make_simple_command ($1, (COMMAND *)NULL); }
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| simple_command simple_command_element
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{ $$ = make_simple_command ($2, $1); }
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;
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command: simple_command
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{ $$ = clean_simple_command ($1); }
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| shell_command
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{ $$ = $1; }
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;
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shell_command: shell_command_1
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{ $$ = $1; }
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| shell_command_1 redirections
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{ $1->redirects = $2; $$ = $1; }
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| redirections shell_command_1
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{ $2->redirects = $1; $$ = $2; }
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;
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shell_command_1: FOR WORD newlines DO list DONE
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{ $$ = make_for_command ($2, (WORD_LIST *)add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5); }
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| FOR WORD newlines '{' list '}'
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{ $$ = make_for_command ($2, (WORD_LIST *)add_string_to_list ("$@", (WORD_LIST *)NULL), $5); }
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| FOR WORD ';' newlines DO list DONE
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{ $$ = make_for_command ($2, (WORD_LIST *)add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6); }
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| FOR WORD ';' newlines '{' list '}'
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{ $$ = make_for_command ($2, (WORD_LIST *)add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6); }
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| FOR WORD newlines IN words list_terminator newlines DO list DONE
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{ $$ = make_for_command ($2, (WORD_LIST *)reverse_list ($5), $9); }
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| FOR WORD newlines IN words list_terminator newlines '{' list '}'
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{ $$ = make_for_command ($2, (WORD_LIST *)reverse_list ($5), $9); }
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| CASE WORD newlines IN newlines ESAC
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{ $$ = make_case_command ($2, (PATTERN_LIST *)NULL); }
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| CASE WORD newlines IN case_clause_sequence newlines ESAC
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{ $$ = make_case_command ($2, $5); }
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| CASE WORD newlines IN case_clause_1 ESAC
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{ /* Nobody likes this...
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report_syntax_error ("Inserted `;;'"); */
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$$ = make_case_command ($2, $5); }
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| if_command
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{ $$ = $1; }
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| WHILE list DO list DONE
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{ $$ = make_while_command ($2, $4); }
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| UNTIL list DO list DONE
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{ $$ = make_until_command ($2, $4); }
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| '(' list ')'
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{ $2->flags |= CMD_WANT_SUBSHELL; $$ = $2; }
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| group_command
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{ $$ = $1; }
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| WORD '(' ')' newlines group_command
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{ $$ = make_function_def ($1, $5); }
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| FUNCTION WORD '(' ')' newlines group_command
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{ $$ = make_function_def ($2, $6); }
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| FUNCTION WORD newlines group_command
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{ $$ = make_function_def ($2, $4); }
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;
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if_command: IF list THEN list FI
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{ $$ = make_if_command ($2, $4, (COMMAND *)NULL); }
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| IF list THEN list ELSE list FI
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{ $$ = make_if_command ($2, $4, $6); }
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| IF list THEN list elif_clause FI
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{ $$ = make_if_command ($2, $4, $5); }
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;
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group_command: '{' list '}'
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{ $$ = make_group_command ($2); }
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;
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elif_clause: ELIF list THEN list
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{ $$ = make_if_command ($2, $4, (COMMAND *)NULL); }
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| ELIF list THEN list ELSE list
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{ $$ = make_if_command ($2, $4, $6); }
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| ELIF list THEN list elif_clause
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{ $$ = make_if_command ($2, $4, $5); }
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;
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case_clause_1: pattern_list_1
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| case_clause_sequence pattern_list_1
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{ $2->next = $1; $$ = $2; }
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;
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pattern_list_1: newlines pattern ')' list
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{ $$ = make_pattern_list ($2, $4); }
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| newlines pattern ')' newlines
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{ $$ = make_pattern_list ($2, (COMMAND *)NULL); }
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| newlines '(' pattern ')' list
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{ $$ = make_pattern_list ($3, $5); }
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| newlines '(' pattern ')' newlines
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{ $$ = make_pattern_list ($3, (COMMAND *)NULL); }
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;
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case_clause_sequence: pattern_list
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| case_clause_sequence pattern_list
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{ $2->next = $1; $$ = $2; }
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;
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pattern_list: newlines pattern ')' list SEMI_SEMI
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{ $$ = make_pattern_list ($2, $4); }
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| newlines pattern ')' newlines SEMI_SEMI
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{ $$ = make_pattern_list ($2, (COMMAND *)NULL); }
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| newlines '(' pattern ')' list SEMI_SEMI
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{ $$ = make_pattern_list ($3, $5); }
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| newlines '(' pattern ')' newlines SEMI_SEMI
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{ $$ = make_pattern_list ($3, (COMMAND *)NULL); }
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;
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pattern: WORD
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{ $$ = make_word_list ($1, (WORD_LIST *)NULL); }
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| pattern '|' WORD
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{ $$ = make_word_list ($3, $1); }
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;
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/* A list allows leading or trailing newlines and
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newlines as operators (equivalent to semicolons).
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It must end with a newline or semicolon.
|
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Lists are used within commands such as if, for, while. */
|
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list: newlines list0
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{
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$$ = $2;
|
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if (need_here_doc)
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make_here_document (redirection_needing_here_doc);
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need_here_doc = 0;
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}
|
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;
|
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list0: list1
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| list1 '\n' newlines
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| list1 '&' newlines
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{ $$ = command_connect ($1, 0, '&'); }
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| list1 ';' newlines
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;
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list1: list1 AND_AND newlines list1
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{ $$ = command_connect ($1, $4, AND_AND); }
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| list1 OR_OR newlines list1
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{ $$ = command_connect ($1, $4, OR_OR); }
|
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| list1 '&' newlines list1
|
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{ $$ = command_connect ($1, $4, '&'); }
|
||
| list1 ';' newlines list1
|
||
{ $$ = command_connect ($1, $4, ';'); }
|
||
| list1 '\n' newlines list1
|
||
{ $$ = command_connect ($1, $4, ';'); }
|
||
| pipeline
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{ $$ = $1; }
|
||
| BANG pipeline
|
||
{
|
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$2->flags |= CMD_INVERT_RETURN;
|
||
$$ = $2;
|
||
}
|
||
;
|
||
|
||
list_terminator:'\n'
|
||
| ';'
|
||
| yacc_EOF
|
||
;
|
||
|
||
newlines:
|
||
| newlines '\n'
|
||
;
|
||
|
||
/* A simple_list is a list that contains no significant newlines
|
||
and no leading or trailing newlines. Newlines are allowed
|
||
only following operators, where they are not significant.
|
||
|
||
This is what an inputunit consists of. */
|
||
|
||
simple_list: simple_list1
|
||
{
|
||
$$ = $1;
|
||
if (need_here_doc)
|
||
make_here_document (redirection_needing_here_doc);
|
||
need_here_doc = 0;
|
||
}
|
||
| simple_list1 '&'
|
||
{
|
||
$$ = command_connect ($1, (COMMAND *)NULL, '&');
|
||
if (need_here_doc)
|
||
make_here_document (redirection_needing_here_doc);
|
||
need_here_doc = 0;
|
||
}
|
||
| simple_list1 ';'
|
||
{
|
||
$$ = $1;
|
||
if (need_here_doc)
|
||
make_here_document (redirection_needing_here_doc);
|
||
need_here_doc = 0;
|
||
}
|
||
;
|
||
|
||
simple_list1: simple_list1 AND_AND newlines simple_list1
|
||
{ $$ = command_connect ($1, $4, AND_AND); }
|
||
| simple_list1 OR_OR newlines simple_list1
|
||
{ $$ = command_connect ($1, $4, OR_OR); }
|
||
| simple_list1 '&' simple_list1
|
||
{ $$ = command_connect ($1, $3, '&'); }
|
||
| simple_list1 ';' simple_list1
|
||
{ $$ = command_connect ($1, $3, ';'); }
|
||
| pipeline
|
||
{ $$ = $1; }
|
||
| BANG pipeline
|
||
{
|
||
$2->flags |= CMD_INVERT_RETURN;
|
||
$$ = $2;
|
||
}
|
||
;
|
||
|
||
pipeline:
|
||
pipeline '|' newlines pipeline
|
||
{ $$ = command_connect ($1, $4, '|'); }
|
||
| command
|
||
{ $$ = $1; }
|
||
;
|
||
%%
|
||
|
||
/* Initial size to allocate for tokens, and the
|
||
amount to grow them by. */
|
||
#define TOKEN_DEFAULT_GROW_SIZE 512
|
||
|
||
/* The token currently being read. */
|
||
int current_token = 0;
|
||
|
||
/* The last read token, or NULL. read_token () uses this for context
|
||
checking. */
|
||
int last_read_token = 0;
|
||
|
||
/* The token read prior to last_read_token. */
|
||
int token_before_that = 0;
|
||
|
||
/* Global var is non-zero when end of file has been reached. */
|
||
int EOF_Reached = 0;
|
||
|
||
/* yy_getc () returns the next available character from input or EOF.
|
||
yy_ungetc (c) makes `c' the next character to read.
|
||
init_yy_io (get, unget), makes the function `get' the installed function
|
||
for getting the next character, and makes `unget' the installed function
|
||
for un-getting a character. */
|
||
return_EOF () /* does nothing good. */
|
||
{
|
||
return (EOF);
|
||
}
|
||
|
||
/* Variables containing the current get and unget functions. */
|
||
|
||
/* Some stream `types'. */
|
||
#define st_stream 0
|
||
#define st_string 1
|
||
|
||
Function *get_yy_char = return_EOF;
|
||
Function *unget_yy_char = return_EOF;
|
||
int yy_input_type = st_stream;
|
||
FILE *yy_input_dev = (FILE *)NULL;
|
||
|
||
/* The current stream name. In the case of a file, this is a filename. */
|
||
char *stream_name = (char *)NULL;
|
||
|
||
/* Function to set get_yy_char and unget_yy_char. */
|
||
init_yy_io (get_function, unget_function, type, location)
|
||
Function *get_function, *unget_function;
|
||
int type;
|
||
FILE *location;
|
||
{
|
||
get_yy_char = get_function;
|
||
unget_yy_char = unget_function;
|
||
yy_input_type = type;
|
||
yy_input_dev = location;
|
||
}
|
||
|
||
/* Call this to get the next character of input. */
|
||
yy_getc ()
|
||
{
|
||
return (*get_yy_char) ();
|
||
}
|
||
|
||
/* Call this to unget C. That is, to make C the next character
|
||
to be read. */
|
||
yy_ungetc (c)
|
||
{
|
||
return (*unget_yy_char) (c);
|
||
}
|
||
|
||
/* **************************************************************** */
|
||
/* */
|
||
/* Let input be read from readline (). */
|
||
/* */
|
||
/* **************************************************************** */
|
||
|
||
#if defined (READLINE)
|
||
char *current_readline_prompt = (char *)NULL;
|
||
char *current_readline_line = (char *)NULL;
|
||
int current_readline_line_index = 0;
|
||
|
||
static int readline_initialized_yet = 0;
|
||
int
|
||
yy_readline_get ()
|
||
{
|
||
if (!current_readline_line)
|
||
{
|
||
extern sighandler sigint_sighandler ();
|
||
extern int interrupt_immediately;
|
||
extern char *readline ();
|
||
SigHandler *old_sigint;
|
||
#if defined (JOB_CONTROL)
|
||
extern pid_t shell_pgrp;
|
||
extern int job_control;
|
||
#endif /* JOB_CONTROL */
|
||
|
||
if (!readline_initialized_yet)
|
||
{
|
||
initialize_readline ();
|
||
readline_initialized_yet = 1;
|
||
}
|
||
|
||
#if defined (JOB_CONTROL)
|
||
if (job_control)
|
||
give_terminal_to (shell_pgrp);
|
||
#endif /* JOB_CONTROL */
|
||
|
||
old_sigint = (SigHandler *)signal (SIGINT, sigint_sighandler);
|
||
interrupt_immediately++;
|
||
|
||
if (!current_readline_prompt)
|
||
current_readline_line = readline ("");
|
||
else
|
||
current_readline_line = readline (current_readline_prompt);
|
||
|
||
interrupt_immediately--;
|
||
signal (SIGINT, old_sigint);
|
||
|
||
/* Reset the prompt to whatever is in the decoded value of
|
||
prompt_string_pointer. */
|
||
reset_readline_prompt ();
|
||
|
||
current_readline_line_index = 0;
|
||
|
||
if (!current_readline_line)
|
||
{
|
||
current_readline_line_index = 0;
|
||
return (EOF);
|
||
}
|
||
|
||
current_readline_line =
|
||
(char *)xrealloc (current_readline_line,
|
||
2 + strlen (current_readline_line));
|
||
strcat (current_readline_line, "\n");
|
||
}
|
||
|
||
if (!current_readline_line[current_readline_line_index])
|
||
{
|
||
free (current_readline_line);
|
||
current_readline_line = (char *)NULL;
|
||
return (yy_readline_get ());
|
||
}
|
||
else
|
||
{
|
||
int c = current_readline_line[current_readline_line_index++];
|
||
return (c);
|
||
}
|
||
}
|
||
|
||
int
|
||
yy_readline_unget (c)
|
||
{
|
||
if (current_readline_line_index && current_readline_line)
|
||
current_readline_line[--current_readline_line_index] = c;
|
||
return (c);
|
||
}
|
||
|
||
with_input_from_stdin ()
|
||
{
|
||
init_yy_io (yy_readline_get, yy_readline_unget,
|
||
st_string, (FILE *)current_readline_line);
|
||
stream_name = savestring ("readline stdin");
|
||
}
|
||
|
||
#else /* !READLINE */
|
||
|
||
with_input_from_stdin ()
|
||
{
|
||
with_input_from_stream (stdin, "stdin");
|
||
}
|
||
#endif /* !READLINE */
|
||
|
||
/* **************************************************************** */
|
||
/* */
|
||
/* Let input come from STRING. STRING is zero terminated. */
|
||
/* */
|
||
/* **************************************************************** */
|
||
|
||
int
|
||
yy_string_get ()
|
||
{
|
||
/* If the string doesn't exist, or is empty, EOF found. */
|
||
if (!(char *)yy_input_dev || !*(char *)yy_input_dev)
|
||
return (EOF);
|
||
else
|
||
{
|
||
register char *temp = (char *)yy_input_dev;
|
||
int c = *temp++;
|
||
yy_input_dev = (FILE *)temp;
|
||
return (c);
|
||
}
|
||
}
|
||
|
||
int
|
||
yy_string_unget (c)
|
||
int c;
|
||
{
|
||
register char *temp = (char *)yy_input_dev;
|
||
*(--temp) = c;
|
||
yy_input_dev = (FILE *)temp;
|
||
return (c);
|
||
}
|
||
|
||
with_input_from_string (string, name)
|
||
char *string;
|
||
char *name;
|
||
{
|
||
init_yy_io (yy_string_get, yy_string_unget, st_string, (FILE *)string);
|
||
stream_name = savestring (name);
|
||
}
|
||
|
||
/* **************************************************************** */
|
||
/* */
|
||
/* Let input come from STREAM. */
|
||
/* */
|
||
/* **************************************************************** */
|
||
|
||
int
|
||
yy_stream_get ()
|
||
{
|
||
if (yy_input_dev)
|
||
#if defined (USG) || (defined (_POSIX_VERSION) && defined (Ultrix))
|
||
return (sysv_getc (yy_input_dev));
|
||
#else
|
||
return (getc (yy_input_dev));
|
||
#endif /* USG || (posix & ultrix) */
|
||
else return (EOF);
|
||
}
|
||
|
||
int
|
||
yy_stream_unget (c)
|
||
int c;
|
||
{
|
||
return (ungetc (c, yy_input_dev));
|
||
}
|
||
|
||
with_input_from_stream (stream, name)
|
||
FILE *stream;
|
||
char *name;
|
||
{
|
||
init_yy_io (yy_stream_get, yy_stream_unget, st_stream, stream);
|
||
stream_name = savestring (name);
|
||
}
|
||
|
||
typedef struct stream_saver {
|
||
struct stream_saver *next;
|
||
Function *getter, *putter;
|
||
int type, line;
|
||
char *location, *name;
|
||
} STREAM_SAVER;
|
||
|
||
/* The globally known line number. */
|
||
int line_number = 0;
|
||
|
||
STREAM_SAVER *stream_list = (STREAM_SAVER *)NULL;
|
||
|
||
push_stream ()
|
||
{
|
||
STREAM_SAVER *temp = (STREAM_SAVER *)xmalloc (sizeof (STREAM_SAVER));
|
||
temp->type = yy_input_type;
|
||
temp->location = (char *)yy_input_dev;
|
||
temp->getter = get_yy_char;
|
||
temp->putter = unget_yy_char;
|
||
temp->line = line_number;
|
||
temp->name = stream_name; stream_name = (char *)NULL;
|
||
temp->next = stream_list;
|
||
stream_list = temp;
|
||
EOF_Reached = line_number = 0;
|
||
}
|
||
|
||
pop_stream ()
|
||
{
|
||
if (!stream_list)
|
||
{
|
||
EOF_Reached = 1;
|
||
}
|
||
else
|
||
{
|
||
STREAM_SAVER *temp = stream_list;
|
||
|
||
EOF_Reached = 0;
|
||
stream_list = stream_list->next;
|
||
|
||
if (stream_name)
|
||
free (stream_name);
|
||
stream_name = temp->name;
|
||
|
||
init_yy_io (temp->getter, temp->putter, temp->type, (FILE *)temp->location);
|
||
line_number = temp->line;
|
||
free (temp);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* This is used to inhibit alias expansion and reserved word recognition
|
||
* inside case statement pattern lists. A `case statement pattern list'
|
||
* is:
|
||
* everything between the `in' in a `case word in' and the next ')'
|
||
* or `esac'
|
||
* everything between a `;;' and the next `)' or `esac'
|
||
*/
|
||
static int in_case_pattern_list = 0;
|
||
|
||
#if defined (ALIAS)
|
||
/*
|
||
* Pseudo-global variables used in implementing token-wise alias expansion.
|
||
*/
|
||
|
||
static int expand_next_token = 0;
|
||
static char *current_token_being_expanded = (char *)NULL;
|
||
static char *pending_token_being_expanded = (char *)NULL;
|
||
|
||
/*
|
||
* Pushing and popping strings. This works together with shell_getc to
|
||
* implement alias expansion on a per-token basis.
|
||
*/
|
||
|
||
typedef struct string_saver {
|
||
struct string_saver *next;
|
||
int expand_alias; /* Value to set expand_alias to when string is popped. */
|
||
char *saved_line;
|
||
int saved_line_size, saved_line_index, saved_line_terminator;
|
||
char *saved_token_being_expanded;
|
||
} STRING_SAVER;
|
||
|
||
STRING_SAVER *pushed_string_list = (STRING_SAVER *)NULL;
|
||
|
||
static void save_expansion ();
|
||
|
||
/*
|
||
* Push the current shell_input_line onto a stack of such lines and make S
|
||
* the current input. Used when expanding aliases. EXPAND is used to set
|
||
* the value of expand_next_token when the string is popped, so that the
|
||
* word after the alias in the original line is handled correctly when the
|
||
* alias expands to multiple words. TOKEN is the token that was expanded
|
||
* into S; it is saved and used to prevent infinite recursive expansion.
|
||
*/
|
||
static void
|
||
push_string (s, expand, token)
|
||
char *s;
|
||
int expand;
|
||
char *token;
|
||
{
|
||
extern char *shell_input_line;
|
||
extern int shell_input_line_size, shell_input_line_index,
|
||
shell_input_line_terminator;
|
||
STRING_SAVER *temp = (STRING_SAVER *) xmalloc (sizeof (STRING_SAVER));
|
||
|
||
temp->expand_alias = expand;
|
||
temp->saved_line = shell_input_line;
|
||
temp->saved_line_size = shell_input_line_size;
|
||
temp->saved_line_index = shell_input_line_index;
|
||
temp->saved_line_terminator = shell_input_line_terminator;
|
||
temp->saved_token_being_expanded = current_token_being_expanded;
|
||
temp->next = pushed_string_list;
|
||
pushed_string_list = temp;
|
||
|
||
save_expansion (token);
|
||
|
||
current_token_being_expanded = token;
|
||
shell_input_line = s;
|
||
shell_input_line_size = strlen (s);
|
||
shell_input_line_index = 0;
|
||
shell_input_line_terminator = '\0';
|
||
expand_next_token = 0;
|
||
}
|
||
|
||
/*
|
||
* Make the top of the pushed_string stack be the current shell input.
|
||
* Only called when there is something on the stack. Called from shell_getc
|
||
* when it thinks it has consumed the string generated by an alias expansion
|
||
* and needs to return to the original input line.
|
||
*/
|
||
static void
|
||
pop_string ()
|
||
{
|
||
extern char *shell_input_line;
|
||
extern int shell_input_line_size, shell_input_line_index,
|
||
shell_input_line_terminator;
|
||
STRING_SAVER *t;
|
||
|
||
if (shell_input_line)
|
||
free (shell_input_line);
|
||
shell_input_line = pushed_string_list->saved_line;
|
||
shell_input_line_index = pushed_string_list->saved_line_index;
|
||
shell_input_line_size = pushed_string_list->saved_line_size;
|
||
shell_input_line_terminator = pushed_string_list->saved_line_terminator;
|
||
expand_next_token = pushed_string_list->expand_alias;
|
||
pending_token_being_expanded = pushed_string_list->saved_token_being_expanded;
|
||
t = pushed_string_list;
|
||
pushed_string_list = pushed_string_list->next;
|
||
free((char *)t);
|
||
}
|
||
|
||
static void
|
||
free_string_list ()
|
||
{
|
||
register STRING_SAVER *t = pushed_string_list, *t1;
|
||
|
||
while (t)
|
||
{
|
||
t1 = t->next;
|
||
if (t->saved_line)
|
||
free (t->saved_line);
|
||
if (t->saved_token_being_expanded)
|
||
free (t->saved_token_being_expanded);
|
||
free ((char *)t);
|
||
t = t1;
|
||
}
|
||
pushed_string_list = (STRING_SAVER *)NULL;
|
||
}
|
||
|
||
/* This is a stack to save the values of all tokens for which alias
|
||
expansion has been performed during the current call to read_token ().
|
||
It is used to prevent alias expansion loops:
|
||
|
||
alias foo=bar
|
||
alias bar=baz
|
||
alias baz=foo
|
||
|
||
Ideally this would be taken care of by push and pop string, but because
|
||
of when strings are popped the stack will not contain the correct
|
||
strings to test against. (The popping is done in shell_getc, so that when
|
||
the current string is exhausted, shell_getc can simply pop that string off
|
||
the stack, restore the previous string, and continue with the character
|
||
following the token whose expansion was originally pushed on the stack.)
|
||
|
||
What we really want is a record of all tokens that have been expanded for
|
||
aliases during the `current' call to read_token(). This does that, at the
|
||
cost of being somewhat special-purpose (OK, OK vile and unclean). Brian,
|
||
you had better rewrite this whole piece of garbage before the next version
|
||
is released.
|
||
*/
|
||
|
||
typedef struct _exp_saver {
|
||
struct _exp_saver *next;
|
||
char *saved_token;
|
||
} EXPANSION_SAVER;
|
||
|
||
EXPANSION_SAVER *expanded_token_stack = (EXPANSION_SAVER *)NULL;
|
||
|
||
static void
|
||
save_expansion (s)
|
||
char *s;
|
||
{
|
||
EXPANSION_SAVER *t;
|
||
|
||
t = (EXPANSION_SAVER *) xmalloc (sizeof (EXPANSION_SAVER));
|
||
t->saved_token = savestring (s);
|
||
t->next = expanded_token_stack;
|
||
expanded_token_stack = t;
|
||
}
|
||
|
||
/*
|
||
* Return 1 if TOKEN has already been expanded in the current `stack' of
|
||
* expansions. If it has been expanded already, it will appear as the value
|
||
* of saved_token for some entry in the stack of expansions created for the
|
||
* current token being expanded.
|
||
*/
|
||
static int
|
||
token_has_been_expanded (token)
|
||
char *token;
|
||
{
|
||
register EXPANSION_SAVER *t = expanded_token_stack;
|
||
|
||
while (t)
|
||
{
|
||
if (STREQ (token, t->saved_token))
|
||
return (1);
|
||
t = t->next;
|
||
}
|
||
return (0);
|
||
}
|
||
|
||
static void
|
||
free_expansion_stack ()
|
||
{
|
||
register EXPANSION_SAVER *t = expanded_token_stack, *t1;
|
||
|
||
while (t)
|
||
{
|
||
t1 = t->next;
|
||
free (t->saved_token);
|
||
free (t);
|
||
t = t1;
|
||
}
|
||
expanded_token_stack = (EXPANSION_SAVER *)NULL;
|
||
}
|
||
|
||
#endif /* ALIAS */
|
||
|
||
/* Return a line of text, taken from wherever yylex () reads input.
|
||
If there is no more input, then we return NULL. */
|
||
char *
|
||
read_a_line ()
|
||
{
|
||
char *line_buffer = (char *)NULL;
|
||
int indx = 0, buffer_size = 0;
|
||
int c;
|
||
|
||
while (1)
|
||
{
|
||
c = yy_getc ();
|
||
|
||
if (c == 0)
|
||
continue;
|
||
|
||
/* If there is no more input, then we return NULL. */
|
||
if (c == EOF)
|
||
{
|
||
c = '\n';
|
||
if (!line_buffer)
|
||
return ((char *)NULL);
|
||
}
|
||
|
||
/* `+2' in case the final (200'th) character in the buffer is a newline;
|
||
otherwise the code below that NULL-terminates it will write over the
|
||
201st slot and kill the range checking in free(). */
|
||
if (indx + 2 > buffer_size)
|
||
if (!buffer_size)
|
||
line_buffer = (char *)xmalloc (buffer_size = 200);
|
||
else
|
||
line_buffer = (char *)xrealloc (line_buffer, buffer_size += 200);
|
||
|
||
line_buffer[indx++] = c;
|
||
if (c == '\n')
|
||
{
|
||
line_buffer[indx] = '\0';
|
||
return (line_buffer);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Return a line as in read_a_line (), but insure that the prompt is
|
||
the secondary prompt. */
|
||
char *
|
||
read_secondary_line ()
|
||
{
|
||
prompt_string_pointer = &ps2_prompt;
|
||
prompt_again ();
|
||
return (read_a_line ());
|
||
}
|
||
|
||
|
||
/* **************************************************************** */
|
||
/* */
|
||
/* YYLEX () */
|
||
/* */
|
||
/* **************************************************************** */
|
||
|
||
/* Reserved words. These are only recognized as the first word of a
|
||
command. TOKEN_WORD_ALIST. */
|
||
STRING_INT_ALIST word_token_alist[] = {
|
||
{"if", IF},
|
||
{"then", THEN},
|
||
{"else", ELSE},
|
||
{"elif", ELIF},
|
||
{"fi", FI},
|
||
{"case", CASE},
|
||
{"esac", ESAC},
|
||
{"for", FOR},
|
||
{"while", WHILE},
|
||
{"until", UNTIL},
|
||
{"do", DO},
|
||
{"done", DONE},
|
||
{"in", IN},
|
||
{"function", FUNCTION},
|
||
{"{", '{'},
|
||
{"}", '}'},
|
||
{"!", BANG},
|
||
{(char *)NULL, 0}
|
||
};
|
||
|
||
/* Where shell input comes from. History expansion is performed on each
|
||
line when the shell is interactive. */
|
||
char *shell_input_line = (char *)NULL;
|
||
int shell_input_line_index = 0;
|
||
int shell_input_line_size = 0; /* Amount allocated for shell_input_line. */
|
||
int shell_input_line_len = 0; /* strlen (shell_input_line) */
|
||
|
||
/* Either zero, or EOF. */
|
||
int shell_input_line_terminator = 0;
|
||
|
||
/* Return the next shell input character. This always reads characters
|
||
from shell_input_line; when that line is exhausted, it is time to
|
||
read the next line. */
|
||
int
|
||
shell_getc (remove_quoted_newline)
|
||
int remove_quoted_newline;
|
||
{
|
||
int c;
|
||
|
||
QUIT;
|
||
|
||
#if defined (ALIAS)
|
||
/* If shell_input_line[shell_input_line_index] == 0, but there is
|
||
something on the pushed list of strings, then we don't want to go
|
||
off and get another line. We let the code down below handle it. */
|
||
|
||
if (!shell_input_line || ((!shell_input_line[shell_input_line_index]) &&
|
||
(pushed_string_list == (STRING_SAVER *)NULL)))
|
||
#else /* !ALIAS */
|
||
if (!shell_input_line || !shell_input_line[shell_input_line_index])
|
||
#endif /* !ALIAS */
|
||
{
|
||
register int i, l;
|
||
char *pre_process_line (), *expansions;
|
||
|
||
restart_read_next_line:
|
||
|
||
line_number++;
|
||
|
||
restart_read:
|
||
|
||
QUIT; /* XXX experimental */
|
||
|
||
i = 0;
|
||
shell_input_line_terminator = 0;
|
||
|
||
#if defined (JOB_CONTROL)
|
||
notify_and_cleanup ();
|
||
#endif
|
||
|
||
clearerr (stdin);
|
||
while (c = yy_getc ())
|
||
{
|
||
if (i + 2 > shell_input_line_size)
|
||
shell_input_line = (char *)
|
||
xrealloc (shell_input_line, shell_input_line_size += 256);
|
||
|
||
if (c == EOF)
|
||
{
|
||
clearerr (stdin);
|
||
|
||
if (!i)
|
||
shell_input_line_terminator = EOF;
|
||
|
||
shell_input_line[i] = '\0';
|
||
break;
|
||
}
|
||
|
||
shell_input_line[i++] = c;
|
||
|
||
if (c == '\n')
|
||
{
|
||
shell_input_line[--i] = '\0';
|
||
current_command_line_count++;
|
||
break;
|
||
}
|
||
}
|
||
shell_input_line_index = 0;
|
||
shell_input_line_len = i; /* == strlen (shell_input_line) */
|
||
|
||
if (!shell_input_line || !shell_input_line[0])
|
||
goto after_pre_process;
|
||
|
||
if (interactive)
|
||
{
|
||
expansions = pre_process_line (shell_input_line, 1, 1);
|
||
|
||
free (shell_input_line);
|
||
shell_input_line = expansions;
|
||
shell_input_line_len = shell_input_line ?
|
||
strlen (shell_input_line) :
|
||
0;
|
||
/* We have to force the xrealloc below because we don't know the
|
||
true allocated size of shell_input_line anymore. */
|
||
shell_input_line_size = shell_input_line_len;
|
||
}
|
||
|
||
after_pre_process:
|
||
if (shell_input_line)
|
||
{
|
||
if (echo_input_at_read)
|
||
fprintf (stderr, "%s\n", shell_input_line);
|
||
}
|
||
else
|
||
{
|
||
shell_input_line_size = 0;
|
||
prompt_string_pointer = ¤t_prompt_string;
|
||
prompt_again ();
|
||
goto restart_read;
|
||
}
|
||
|
||
/* Add the newline to the end of this string, iff the string does
|
||
not already end in an EOF character. */
|
||
if (shell_input_line_terminator != EOF)
|
||
{
|
||
l = shell_input_line_len; /* was a call to strlen */
|
||
|
||
if (l + 3 > shell_input_line_size)
|
||
shell_input_line = (char *)xrealloc (shell_input_line,
|
||
1 + (shell_input_line_size += 2));
|
||
|
||
strcpy (shell_input_line + l, "\n");
|
||
}
|
||
}
|
||
|
||
c = shell_input_line[shell_input_line_index];
|
||
|
||
if (c)
|
||
shell_input_line_index++;
|
||
|
||
if (c == '\\' && remove_quoted_newline &&
|
||
shell_input_line[shell_input_line_index] == '\n')
|
||
{
|
||
prompt_again ();
|
||
goto restart_read_next_line;
|
||
}
|
||
|
||
#if defined (ALIAS)
|
||
/*
|
||
* If c is NULL, we have reached the end of the current input string. If
|
||
* pushed_string_list is non-empty, it's time to pop to the previous string
|
||
* because we have fully consumed the result of the last alias expansion.
|
||
* Do it transparently; just return the next character of the string popped
|
||
* to. We need to hang onto current_token_being_expanded until the token
|
||
* currently being read has been recognized; we can't restore it in
|
||
* pop_string () because the token currently being read would be
|
||
* inappropriately compared with it. We defer restoration until the next
|
||
* call to read_token ().
|
||
*/
|
||
|
||
if (!c && (pushed_string_list != (STRING_SAVER *)NULL))
|
||
{
|
||
pop_string ();
|
||
c = shell_input_line[shell_input_line_index];
|
||
if (c)
|
||
shell_input_line_index++;
|
||
}
|
||
#endif /* ALIAS */
|
||
|
||
if (!c && shell_input_line_terminator == EOF)
|
||
{
|
||
if (shell_input_line_index != 0)
|
||
return ('\n');
|
||
else
|
||
return (EOF);
|
||
}
|
||
|
||
return (c);
|
||
}
|
||
|
||
/* Put C back into the input for the shell. */
|
||
shell_ungetc (c)
|
||
int c;
|
||
{
|
||
if (shell_input_line && shell_input_line_index)
|
||
shell_input_line[--shell_input_line_index] = c;
|
||
}
|
||
|
||
/* Discard input until CHARACTER is seen. */
|
||
discard_until (character)
|
||
int character;
|
||
{
|
||
int c;
|
||
|
||
while ((c = shell_getc (0)) != EOF && c != character)
|
||
;
|
||
|
||
if (c != EOF)
|
||
shell_ungetc (c);
|
||
}
|
||
|
||
#if defined (HISTORY_REEDITING)
|
||
/* Tell readline () that we have some text for it to edit. */
|
||
re_edit (text)
|
||
char *text;
|
||
{
|
||
#if defined (READLINE)
|
||
if (strcmp (stream_name, "readline stdin") == 0)
|
||
bash_re_edit (text);
|
||
#endif /* READLINE */
|
||
}
|
||
#endif /* HISTORY_REEDITING */
|
||
|
||
/* Non-zero means do no history expansion on this line, regardless
|
||
of what history_expansion says. */
|
||
int history_expansion_inhibited = 0;
|
||
|
||
/* Do pre-processing on LINE. If PRINT_CHANGES is non-zero, then
|
||
print the results of expanding the line if there were any changes.
|
||
If there is an error, return NULL, otherwise the expanded line is
|
||
returned. If ADDIT is non-zero the line is added to the history
|
||
list after history expansion. ADDIT is just a suggestion;
|
||
REMEMBER_ON_HISTORY can veto, and does.
|
||
Right now this does history expansion. */
|
||
char *
|
||
pre_process_line (line, print_changes, addit)
|
||
char *line;
|
||
int print_changes, addit;
|
||
{
|
||
extern int remember_on_history;
|
||
extern int history_expansion;
|
||
extern int history_expand ();
|
||
char *history_value;
|
||
char *return_value;
|
||
int expanded = 0;
|
||
|
||
return_value = line;
|
||
|
||
/* History expand the line. If this results in no errors, then
|
||
add that line to the history if ADDIT is non-zero. */
|
||
if (!history_expansion_inhibited && history_expansion)
|
||
{
|
||
expanded = history_expand (line, &history_value);
|
||
|
||
if (expanded)
|
||
{
|
||
if (print_changes)
|
||
fprintf (stderr, "%s\n", history_value);
|
||
|
||
/* If there was an error, return NULL. */
|
||
if (expanded < 0)
|
||
{
|
||
free (history_value);
|
||
|
||
#if defined (HISTORY_REEDITING)
|
||
/* New hack. We can allow the user to edit the
|
||
failed history expansion. */
|
||
re_edit (line);
|
||
#endif /* HISTORY_REEDITING */
|
||
return ((char *)NULL);
|
||
}
|
||
}
|
||
|
||
/* Let other expansions know that return_value can be free'ed,
|
||
and that a line has been added to the history list. Note
|
||
that we only add lines that have something in them. */
|
||
expanded = 1;
|
||
return_value = history_value;
|
||
}
|
||
|
||
if (addit && remember_on_history && *return_value)
|
||
{
|
||
extern int history_control;
|
||
|
||
switch (history_control)
|
||
{
|
||
case 0:
|
||
bash_add_history (return_value);
|
||
break;
|
||
case 1:
|
||
if (*return_value != ' ')
|
||
bash_add_history (return_value);
|
||
break;
|
||
case 2:
|
||
{
|
||
HIST_ENTRY *temp;
|
||
|
||
using_history ();
|
||
temp = previous_history ();
|
||
|
||
if (!temp || (strcmp (temp->line, return_value) != 0))
|
||
bash_add_history (return_value);
|
||
|
||
using_history ();
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (!expanded)
|
||
return_value = savestring (line);
|
||
|
||
return (return_value);
|
||
}
|
||
|
||
|
||
/* Place to remember the token. We try to keep the buffer
|
||
at a reasonable size, but it can grow. */
|
||
char *token = (char *)NULL;
|
||
|
||
/* Current size of the token buffer. */
|
||
int token_buffer_size = 0;
|
||
|
||
/* Command to read_token () explaining what we want it to do. */
|
||
#define READ 0
|
||
#define RESET 1
|
||
#define prompt_is_ps1 \
|
||
(!prompt_string_pointer || prompt_string_pointer == &ps1_prompt)
|
||
|
||
/* Function for yyparse to call. yylex keeps track of
|
||
the last two tokens read, and calls read_token. */
|
||
|
||
yylex ()
|
||
{
|
||
if (interactive && (!current_token || current_token == '\n'))
|
||
{
|
||
/* Before we print a prompt, we might have to check mailboxes.
|
||
We do this only if it is time to do so. Notice that only here
|
||
is the mail alarm reset; nothing takes place in check_mail ()
|
||
except the checking of mail. Please don't change this. */
|
||
if (prompt_is_ps1 && time_to_check_mail ())
|
||
{
|
||
check_mail ();
|
||
reset_mail_timer ();
|
||
}
|
||
|
||
/* Allow the execution of a random command just before the printing
|
||
of each primary prompt. If the shell variable PROMPT_COMMAND
|
||
is set then the value of it is the command to execute. */
|
||
if (prompt_is_ps1)
|
||
{
|
||
char *command_to_execute = get_string_value ("PROMPT_COMMAND");
|
||
|
||
if (command_to_execute)
|
||
{
|
||
extern Function *last_shell_builtin, *this_shell_builtin;
|
||
extern int last_command_exit_value;
|
||
Function *temp_last, *temp_this;
|
||
int temp_exit_value, temp_eof_encountered;
|
||
|
||
temp_last = last_shell_builtin;
|
||
temp_this = this_shell_builtin;
|
||
temp_exit_value = last_command_exit_value;
|
||
temp_eof_encountered = eof_encountered;
|
||
|
||
parse_and_execute
|
||
(savestring (command_to_execute), "PROMPT_COMMAND");
|
||
|
||
last_shell_builtin = temp_last;
|
||
this_shell_builtin = temp_this;
|
||
last_command_exit_value = temp_exit_value;
|
||
eof_encountered = temp_eof_encountered;
|
||
}
|
||
}
|
||
prompt_again ();
|
||
}
|
||
|
||
token_before_that = last_read_token;
|
||
last_read_token = current_token;
|
||
current_token = read_token (READ);
|
||
return (current_token);
|
||
}
|
||
|
||
/* Called from shell.c when Control-C is typed at top level. Or
|
||
by the error rule at top level. */
|
||
reset_parser ()
|
||
{
|
||
read_token (RESET);
|
||
}
|
||
|
||
/* When non-zero, we have read the required tokens
|
||
which allow ESAC to be the next one read. */
|
||
static int allow_esac_as_next = 0;
|
||
|
||
/* When non-zero, accept single '{' as a token itself. */
|
||
static int allow_open_brace = 0;
|
||
|
||
/* DELIMITER is the value of the delimiter that is currently
|
||
enclosing, or zero for none. */
|
||
static int delimiter = 0;
|
||
static int old_delimiter = 0;
|
||
|
||
/* When non-zero, an open-brace used to create a group is awaiting a close
|
||
brace partner. */
|
||
static int open_brace_awaiting_satisfaction = 0;
|
||
|
||
/* If non-zero, it is the token that we want read_token to return regardless
|
||
of what text is (or isn't) present to be read. read_token resets this. */
|
||
int token_to_read = 0;
|
||
|
||
/* Read the next token. Command can be READ (normal operation) or
|
||
RESET (to normalize state). */
|
||
read_token (command)
|
||
int command;
|
||
{
|
||
extern int interactive_shell; /* Whether the current shell is interactive. */
|
||
int character; /* Current character. */
|
||
int peek_char; /* Temporary look-ahead character. */
|
||
int result; /* The thing to return. */
|
||
WORD_DESC *the_word; /* The value for YYLVAL when a WORD is read. */
|
||
|
||
if (token_buffer_size < TOKEN_DEFAULT_GROW_SIZE)
|
||
{
|
||
if (token)
|
||
free (token);
|
||
token = (char *)xmalloc (token_buffer_size = TOKEN_DEFAULT_GROW_SIZE);
|
||
}
|
||
|
||
if (command == RESET)
|
||
{
|
||
delimiter = old_delimiter = 0;
|
||
open_brace_awaiting_satisfaction = 0;
|
||
in_case_pattern_list = 0;
|
||
|
||
#if defined (ALIAS)
|
||
if (pushed_string_list)
|
||
{
|
||
free_string_list ();
|
||
pushed_string_list = (STRING_SAVER *)NULL;
|
||
}
|
||
|
||
if (pending_token_being_expanded)
|
||
{
|
||
free (pending_token_being_expanded);
|
||
pending_token_being_expanded = (char *)NULL;
|
||
}
|
||
|
||
if (current_token_being_expanded)
|
||
{
|
||
free (current_token_being_expanded);
|
||
current_token_being_expanded = (char *)NULL;
|
||
}
|
||
|
||
if (expanded_token_stack)
|
||
{
|
||
free_expansion_stack ();
|
||
expanded_token_stack = (EXPANSION_SAVER *)NULL;
|
||
}
|
||
|
||
expand_next_token = 0;
|
||
#endif /* ALIAS */
|
||
|
||
if (shell_input_line)
|
||
{
|
||
free (shell_input_line);
|
||
shell_input_line = (char *)NULL;
|
||
shell_input_line_size = shell_input_line_index = 0;
|
||
}
|
||
last_read_token = '\n';
|
||
token_to_read = '\n';
|
||
return ('\n');
|
||
}
|
||
|
||
if (token_to_read)
|
||
{
|
||
int rt = token_to_read;
|
||
token_to_read = 0;
|
||
return (rt);
|
||
}
|
||
|
||
#if defined (ALIAS)
|
||
/*
|
||
* Now we can replace current_token_being_expanded with
|
||
* pending_token_being_expanded, since the token that would be
|
||
* inappropriately compared has already been returned.
|
||
*
|
||
* To see why restoring current_token_being_expanded in pop_string ()
|
||
* could be a problem, consider "alias foo=foo". Then try to
|
||
* expand `foo'. The initial value of current_token_being_expanded is
|
||
* NULL, so that is what is pushed onto pushed_string_list as the
|
||
* value of saved_token_being_expanded. "foo" then becomes shell_input_line.
|
||
* read_token calls shell_getc for `f', `o', `o', and then shell_getc
|
||
* hits the end of shell_input_line. pushed_string_list is not empty
|
||
* so it gets popped. If we were to blindly restore
|
||
* current_token_being_expanded at this point, `foo' would be compared
|
||
* with a NULL string in the check for recursive expansion, and would
|
||
* infinitely recurse.
|
||
*/
|
||
if (pending_token_being_expanded)
|
||
{
|
||
if (current_token_being_expanded)
|
||
free (current_token_being_expanded);
|
||
current_token_being_expanded = pending_token_being_expanded;
|
||
pending_token_being_expanded = (char *)NULL;
|
||
}
|
||
|
||
/* If we hit read_token () and there are no saved strings on the
|
||
pushed_string_list, then we are no longer currently expanding a
|
||
token. This can't be done in pop_stream, because pop_stream
|
||
may pop the stream before the current token has finished being
|
||
completely expanded (consider what happens when we alias foo to foo,
|
||
and then try to expand it). */
|
||
if (!pushed_string_list && current_token_being_expanded)
|
||
{
|
||
free (current_token_being_expanded);
|
||
current_token_being_expanded = (char *)NULL;
|
||
|
||
if (expanded_token_stack)
|
||
{
|
||
free_expansion_stack ();
|
||
expanded_token_stack = (EXPANSION_SAVER *)NULL;
|
||
}
|
||
}
|
||
|
||
/* This is a place to jump back to once we have successfully expanded a
|
||
token with an alias and pushed the string with push_string () */
|
||
re_read_token:
|
||
|
||
#endif /* ALIAS */
|
||
|
||
/* Read a single word from input. Start by skipping blanks. */
|
||
while ((character = shell_getc (1)) != EOF && whitespace (character));
|
||
|
||
if (character == EOF)
|
||
return (yacc_EOF);
|
||
|
||
if (character == '#' && !interactive)
|
||
{
|
||
/* A comment. Discard until EOL or EOF, and then return a newline. */
|
||
discard_until ('\n');
|
||
shell_getc (0);
|
||
|
||
/* If we're about to return an unquoted newline, we can go and collect
|
||
the text of any pending here document. */
|
||
if (need_here_doc)
|
||
make_here_document (redirection_needing_here_doc);
|
||
need_here_doc = 0;
|
||
|
||
#if defined (ALIAS)
|
||
expand_next_token = 0;
|
||
#endif /* ALIAS */
|
||
|
||
return ('\n');
|
||
}
|
||
|
||
if (character == '\n')
|
||
{
|
||
/* If we're about to return an unquoted newline, we can go and collect
|
||
the text of any pending here document. */
|
||
if (need_here_doc)
|
||
make_here_document (redirection_needing_here_doc);
|
||
need_here_doc = 0;
|
||
|
||
#if defined (ALIAS)
|
||
expand_next_token = 0;
|
||
#endif /* ALIAS */
|
||
|
||
return (character);
|
||
}
|
||
|
||
if (member (character, "()<>;&|"))
|
||
{
|
||
#if defined (ALIAS)
|
||
/* Turn off alias tokenization iff this character sequence would
|
||
not leave us ready to read a command. */
|
||
if (character == '<' || character == '>')
|
||
expand_next_token = 0;
|
||
#endif /* ALIAS */
|
||
|
||
/* Please note that the shell does not allow whitespace to
|
||
appear in between tokens which are character pairs, such as
|
||
"<<" or ">>". I believe this is the correct behaviour. */
|
||
if (character == (peek_char = shell_getc (1)))
|
||
{
|
||
switch (character)
|
||
{
|
||
/* If '<' then we could be at "<<" or at "<<-". We have to
|
||
look ahead one more character. */
|
||
case '<':
|
||
peek_char = shell_getc (1);
|
||
if (peek_char == '-')
|
||
return (LESS_LESS_MINUS);
|
||
else
|
||
{
|
||
shell_ungetc (peek_char);
|
||
return (LESS_LESS);
|
||
}
|
||
|
||
case '>':
|
||
return (GREATER_GREATER);
|
||
|
||
case ';':
|
||
in_case_pattern_list = 1;
|
||
#if defined (ALIAS)
|
||
expand_next_token = 0;
|
||
#endif /* ALIAS */
|
||
return (SEMI_SEMI);
|
||
|
||
case '&':
|
||
return (AND_AND);
|
||
|
||
case '|':
|
||
return (OR_OR);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (peek_char == '&')
|
||
{
|
||
switch (character)
|
||
{
|
||
case '<': return (LESS_AND);
|
||
case '>': return (GREATER_AND);
|
||
}
|
||
}
|
||
if (character == '<' && peek_char == '>')
|
||
return (LESS_GREATER);
|
||
if (character == '>' && peek_char == '|')
|
||
return (GREATER_BAR);
|
||
if (peek_char == '>' && character == '&')
|
||
return (AND_GREATER);
|
||
}
|
||
shell_ungetc (peek_char);
|
||
|
||
/* If we look like we are reading the start of a function
|
||
definition, then let the reader know about it so that
|
||
we will do the right thing with `{'. */
|
||
if (character == ')' &&
|
||
last_read_token == '(' && token_before_that == WORD)
|
||
{
|
||
allow_open_brace = 1;
|
||
#if defined (ALIAS)
|
||
expand_next_token = 0;
|
||
#endif /* ALIAS */
|
||
}
|
||
|
||
if (in_case_pattern_list && (character == ')'))
|
||
in_case_pattern_list = 0;
|
||
|
||
return (character);
|
||
}
|
||
|
||
/* Hack <&- (close stdin) case. */
|
||
if (character == '-')
|
||
{
|
||
switch (last_read_token)
|
||
{
|
||
case LESS_AND:
|
||
case GREATER_AND:
|
||
return (character);
|
||
}
|
||
}
|
||
|
||
/* Okay, if we got this far, we have to read a word. Read one,
|
||
and then check it against the known ones. */
|
||
{
|
||
/* Index into the token that we are building. */
|
||
int token_index = 0;
|
||
|
||
/* ALL_DIGITS becomes zero when we see a non-digit. */
|
||
int all_digits = digit (character);
|
||
|
||
/* DOLLAR_PRESENT becomes non-zero if we see a `$'. */
|
||
int dollar_present = 0;
|
||
|
||
/* QUOTED becomes non-zero if we see one of ("), ('), (`), or (\). */
|
||
int quoted = 0;
|
||
|
||
/* Non-zero means to ignore the value of the next character, and just
|
||
to add it no matter what. */
|
||
int pass_next_character = 0;
|
||
|
||
/* Non-zero means parsing a dollar-paren construct. It is the count of
|
||
un-quoted closes we need to see. */
|
||
int dollar_paren_level = 0;
|
||
|
||
/* Non-zero means parsing a dollar-bracket construct ($[...]). It is
|
||
the count of un-quoted `]' characters we need to see. */
|
||
int dollar_bracket_level = 0;
|
||
|
||
/* Another level variable. This one is for dollar_parens inside of
|
||
double-quotes. */
|
||
int delimited_paren_level = 0;
|
||
|
||
for (;;)
|
||
{
|
||
if (character == EOF)
|
||
goto got_token;
|
||
|
||
if (pass_next_character)
|
||
{
|
||
pass_next_character = 0;
|
||
goto got_character;
|
||
}
|
||
|
||
if (delimiter && character == '\\' && delimiter != '\'')
|
||
{
|
||
peek_char = shell_getc (0);
|
||
if (peek_char != '\\')
|
||
shell_ungetc (peek_char);
|
||
else
|
||
{
|
||
token[token_index++] = character;
|
||
goto got_character;
|
||
}
|
||
}
|
||
|
||
/* Handle backslashes. Quote lots of things when not inside of
|
||
double-quotes, quote some things inside of double-quotes. */
|
||
|
||
if (character == '\\' && delimiter != '\'')
|
||
{
|
||
peek_char = shell_getc (0);
|
||
|
||
/* Backslash-newline is ignored in all cases excepting
|
||
when quoted with single quotes. */
|
||
if (peek_char == '\n')
|
||
{
|
||
character = '\n';
|
||
goto next_character;
|
||
}
|
||
else
|
||
{
|
||
shell_ungetc (peek_char);
|
||
|
||
/* If the next character is to be quoted, do it now. */
|
||
if (!delimiter || delimiter == '`' ||
|
||
((delimiter == '"' ) &&
|
||
(member (peek_char, slashify_in_quotes))))
|
||
{
|
||
pass_next_character++;
|
||
quoted = 1;
|
||
goto got_character;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* This is a hack, in its present form. If a backquote substitution
|
||
appears within double quotes, everything within the backquotes
|
||
should be read as part of a single word. Jesus. Now I see why
|
||
Korn introduced the $() form. */
|
||
if (delimiter && delimiter == '"' && character == '`')
|
||
{
|
||
old_delimiter = delimiter;
|
||
delimiter = character;
|
||
goto got_character;
|
||
}
|
||
|
||
if (delimiter)
|
||
{
|
||
if (character == delimiter)
|
||
{
|
||
if (delimited_paren_level)
|
||
{
|
||
#if defined (NOTDEF)
|
||
report_error ("Expected ')' before %c", character);
|
||
return ('\n');
|
||
#else
|
||
goto got_character;
|
||
#endif /* NOTDEF */
|
||
}
|
||
|
||
delimiter = 0;
|
||
|
||
if (old_delimiter == '"' && character == '`')
|
||
{
|
||
delimiter = old_delimiter;
|
||
old_delimiter = 0;
|
||
}
|
||
|
||
goto got_character;
|
||
}
|
||
}
|
||
|
||
if (!delimiter || delimiter == '`' || delimiter == '"')
|
||
{
|
||
if (character == '$')
|
||
{
|
||
peek_char = shell_getc (1);
|
||
shell_ungetc (peek_char);
|
||
if (peek_char == '(')
|
||
{
|
||
if (!delimiter)
|
||
dollar_paren_level++;
|
||
else
|
||
delimited_paren_level++;
|
||
|
||
pass_next_character++;
|
||
goto got_character;
|
||
}
|
||
else if (peek_char == '[')
|
||
{
|
||
if (!delimiter)
|
||
dollar_bracket_level++;
|
||
|
||
pass_next_character++;
|
||
goto got_character;
|
||
}
|
||
}
|
||
|
||
/* If we are parsing a $() or $[] construct, we need to balance
|
||
parens and brackets inside the construct. This whole function
|
||
could use a rewrite. */
|
||
if (character == '(')
|
||
{
|
||
if (delimiter && delimited_paren_level)
|
||
delimited_paren_level++;
|
||
|
||
if (!delimiter && dollar_paren_level)
|
||
dollar_paren_level++;
|
||
}
|
||
|
||
if (character == '[')
|
||
{
|
||
if (!delimiter && dollar_bracket_level)
|
||
dollar_bracket_level++;
|
||
}
|
||
|
||
/* This code needs to take into account whether we are inside a
|
||
case statement pattern list, and whether this paren is supposed
|
||
to terminate it (hey, it could happen). It's not as simple
|
||
as just using in_case_pattern_list, because we're not parsing
|
||
anything while we're reading a $( ) construct. Maybe we
|
||
should move that whole mess into the yacc parser. */
|
||
if (character == ')')
|
||
{
|
||
if (delimiter && delimited_paren_level)
|
||
delimited_paren_level--;
|
||
|
||
if (!delimiter && dollar_paren_level)
|
||
{
|
||
dollar_paren_level--;
|
||
goto got_character;
|
||
}
|
||
}
|
||
|
||
if (character == ']')
|
||
{
|
||
if (!delimiter && dollar_bracket_level)
|
||
{
|
||
dollar_bracket_level--;
|
||
goto got_character;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (!dollar_paren_level && !dollar_bracket_level && !delimiter &&
|
||
member (character, " \t\n;&()|<>"))
|
||
{
|
||
shell_ungetc (character);
|
||
goto got_token;
|
||
}
|
||
|
||
if (!delimiter)
|
||
{
|
||
if (character == '"' || character == '`' || character == '\'')
|
||
{
|
||
quoted = 1;
|
||
delimiter = character;
|
||
goto got_character;
|
||
}
|
||
}
|
||
|
||
if (all_digits) all_digits = digit (character);
|
||
if (character == '$') dollar_present = 1;
|
||
|
||
got_character:
|
||
|
||
token[token_index++] = character;
|
||
|
||
if (token_index == (token_buffer_size - 1))
|
||
token = (char *)xrealloc (token, (token_buffer_size
|
||
+= TOKEN_DEFAULT_GROW_SIZE));
|
||
{
|
||
char *decode_prompt_string ();
|
||
|
||
next_character:
|
||
if (character == '\n' && interactive && yy_input_type != st_string)
|
||
prompt_again ();
|
||
}
|
||
/* We want to remove quoted newlines (that is, a \<newline> pair)
|
||
unless we are within single quotes or pass_next_character is
|
||
set (the shell equivalent of literal-next). */
|
||
character = shell_getc ((delimiter != '\'') && (!pass_next_character));
|
||
}
|
||
|
||
got_token:
|
||
|
||
token[token_index] = '\0';
|
||
|
||
if ((delimiter || dollar_paren_level || dollar_bracket_level) &&
|
||
character == EOF)
|
||
{
|
||
if (dollar_paren_level && !delimiter)
|
||
delimiter = ')';
|
||
else if (dollar_bracket_level && !delimiter)
|
||
delimiter = ']';
|
||
|
||
report_error ("Unexpected EOF. Looking for `%c'.", delimiter);
|
||
return (-1);
|
||
}
|
||
|
||
if (all_digits)
|
||
{
|
||
/* Check to see what thing we should return. If the last_read_token
|
||
is a `<', or a `&', or the character which ended this token is
|
||
a '>' or '<', then, and ONLY then, is this input token a NUMBER.
|
||
Otherwise, it is just a word, and should be returned as such. */
|
||
|
||
if ((character == '<' || character == '>') ||
|
||
(last_read_token == LESS_AND ||
|
||
last_read_token == GREATER_AND))
|
||
{
|
||
yylval.number = atoi (token); /* was sscanf (token, "%d", &(yylval.number)); */
|
||
return (NUMBER);
|
||
}
|
||
}
|
||
|
||
/* Handle special case. IN is recognized if the last token
|
||
was WORD and the token before that was FOR or CASE. */
|
||
if ((last_read_token == WORD) &&
|
||
((token_before_that == FOR) || (token_before_that == CASE)) &&
|
||
(STREQ (token, "in")))
|
||
{
|
||
if (token_before_that == CASE)
|
||
{
|
||
in_case_pattern_list = 1;
|
||
allow_esac_as_next++;
|
||
}
|
||
return (IN);
|
||
}
|
||
|
||
/* Ditto for DO in the FOR case. */
|
||
if ((last_read_token == WORD) && (token_before_that == FOR) &&
|
||
(STREQ (token, "do")))
|
||
return (DO);
|
||
|
||
/* Ditto for ESAC in the CASE case.
|
||
Specifically, this handles "case word in esac", which is a legal
|
||
construct, certainly because someone will pass an empty arg to the
|
||
case construct, and we don't want it to barf. Of course, we should
|
||
insist that the case construct has at least one pattern in it, but
|
||
the designers disagree. */
|
||
if (allow_esac_as_next)
|
||
{
|
||
allow_esac_as_next--;
|
||
if (STREQ (token, "esac"))
|
||
{
|
||
in_case_pattern_list = 0;
|
||
return (ESAC);
|
||
}
|
||
}
|
||
|
||
/* Ditto for `{' in the FUNCTION case. */
|
||
if (allow_open_brace)
|
||
{
|
||
allow_open_brace = 0;
|
||
if (STREQ (token, "{"))
|
||
{
|
||
open_brace_awaiting_satisfaction++;
|
||
return ('{');
|
||
}
|
||
}
|
||
|
||
#if defined (ALIAS)
|
||
|
||
#define command_token_position(token) \
|
||
((token) != SEMI_SEMI && reserved_word_acceptable (token))
|
||
|
||
/* OK, we have a token. Let's try to alias expand it, if (and only if)
|
||
it's eligible.
|
||
|
||
It is eligible for expansion if the shell is in interactive mode, and
|
||
the token is unquoted and the last token read was a command
|
||
separator (or expand_next_token is set), and we are currently
|
||
processing an alias (pushed_string_list is non-empty) and this
|
||
token is not the same as the current or any previously
|
||
processed alias.
|
||
|
||
Special cases that disqualify:
|
||
In a pattern list in a case statement (in_case_pattern_list). */
|
||
if (interactive_shell && !quoted && !in_case_pattern_list &&
|
||
(command_token_position (last_read_token) || expand_next_token))
|
||
{
|
||
char *alias_expand_word (), *expanded;
|
||
if (current_token_being_expanded &&
|
||
((STREQ (token, current_token_being_expanded)) ||
|
||
(token_has_been_expanded (token))))
|
||
goto no_expansion;
|
||
|
||
expanded = alias_expand_word (token);
|
||
if (expanded)
|
||
{
|
||
int len = strlen (expanded), expand_next;
|
||
char *temp;
|
||
|
||
/* Erase the current token. */
|
||
token_index = 0;
|
||
|
||
expand_next = (expanded[len - 1] == ' ') ||
|
||
(expanded[len - 1] == '\t');
|
||
|
||
temp = savestring (token);
|
||
push_string (expanded, expand_next, temp);
|
||
goto re_read_token;
|
||
}
|
||
else
|
||
/* This is an eligible token that does not have an expansion. */
|
||
no_expansion:
|
||
expand_next_token = 0;
|
||
}
|
||
else
|
||
{
|
||
expand_next_token = 0;
|
||
}
|
||
#endif /* ALIAS */
|
||
|
||
/* Check to see if it is a reserved word. */
|
||
if (!dollar_present && !quoted &&
|
||
reserved_word_acceptable (last_read_token))
|
||
{
|
||
int i;
|
||
for (i = 0; word_token_alist[i].word != (char *)NULL; i++)
|
||
if (STREQ (token, word_token_alist[i].word))
|
||
{
|
||
if (in_case_pattern_list && (word_token_alist[i].token != ESAC))
|
||
break;
|
||
|
||
if (word_token_alist[i].token == ESAC)
|
||
in_case_pattern_list = 0;
|
||
|
||
if (word_token_alist[i].token == '{')
|
||
open_brace_awaiting_satisfaction++;
|
||
|
||
return (word_token_alist[i].token);
|
||
}
|
||
}
|
||
|
||
/* What if we are attempting to satisfy an open-brace grouper? */
|
||
if (open_brace_awaiting_satisfaction && strcmp (token, "}") == 0)
|
||
{
|
||
open_brace_awaiting_satisfaction--;
|
||
return ('}');
|
||
}
|
||
|
||
the_word = (WORD_DESC *)xmalloc (sizeof (WORD_DESC));
|
||
the_word->word = (char *)xmalloc (1 + strlen (token));
|
||
strcpy (the_word->word, token);
|
||
the_word->dollar_present = dollar_present;
|
||
the_word->quoted = quoted;
|
||
the_word->assignment = assignment (token);
|
||
|
||
yylval.word = the_word;
|
||
result = WORD;
|
||
if (last_read_token == FUNCTION)
|
||
allow_open_brace = 1;
|
||
}
|
||
return (result);
|
||
}
|
||
|
||
#if defined (NOTDEF) /* Obsoleted function no longer used. */
|
||
/* Return 1 if this token is a legal shell `identifier'; that is, it consists
|
||
solely of letters, digits, and underscores, and does not begin with a
|
||
digit. */
|
||
legal_identifier (name)
|
||
char *name;
|
||
{
|
||
register char *s;
|
||
|
||
if (!name || !*name)
|
||
return (0);
|
||
|
||
if (digit (*name))
|
||
return (0);
|
||
|
||
for (s = name; s && *s; s++)
|
||
{
|
||
if (!isletter (*s) && !digit (*s) && (*s != '_'))
|
||
return (0);
|
||
}
|
||
return (1);
|
||
}
|
||
#endif /* NOTDEF */
|
||
|
||
/* Return 1 if TOKEN is a token that after being read would allow
|
||
a reserved word to be seen, else 0. */
|
||
static int
|
||
reserved_word_acceptable (token)
|
||
int token;
|
||
{
|
||
if (member (token, "\n;()|&{") ||
|
||
token == AND_AND ||
|
||
token == BANG ||
|
||
token == DO ||
|
||
token == ELIF ||
|
||
token == ELSE ||
|
||
token == IF ||
|
||
token == OR_OR ||
|
||
token == SEMI_SEMI ||
|
||
token == THEN ||
|
||
token == UNTIL ||
|
||
token == WHILE ||
|
||
token == 0)
|
||
return (1);
|
||
else
|
||
return (0);
|
||
}
|
||
|
||
#if defined (READLINE)
|
||
/* Called after each time readline is called. This insures that whatever
|
||
the new prompt string is gets propagated to readline's local prompt
|
||
variable. */
|
||
reset_readline_prompt ()
|
||
{
|
||
if (prompt_string_pointer && *prompt_string_pointer)
|
||
{
|
||
char *temp_prompt, *decode_prompt_string ();
|
||
|
||
temp_prompt = decode_prompt_string (*prompt_string_pointer);
|
||
|
||
if (!temp_prompt)
|
||
temp_prompt = savestring ("");
|
||
|
||
if (current_readline_prompt)
|
||
free (current_readline_prompt);
|
||
|
||
current_readline_prompt = temp_prompt;
|
||
}
|
||
}
|
||
#endif
|
||
|
||
/* A list of tokens which can be followed by newlines, but not by
|
||
semi-colons. When concatenating multiple lines of history, the
|
||
newline separator for such tokens is replaced with a space. */
|
||
int no_semi_successors[] = {
|
||
'\n', '{', '(', ')', ';',
|
||
CASE, DO, ELSE, IF, IN, SEMI_SEMI, THEN, UNTIL, WHILE,
|
||
0
|
||
};
|
||
|
||
/* Add a line to the history list.
|
||
The variable COMMAND_ORIENTED_HISTORY controls the style of history
|
||
remembering; when non-zero, and LINE is not the first line of a
|
||
complete parser construct, append LINE to the last history line instead
|
||
of adding it as a new line. */
|
||
bash_add_history (line)
|
||
char *line;
|
||
{
|
||
extern int command_oriented_history;
|
||
int add_it = 1;
|
||
|
||
if (command_oriented_history && current_command_line_count > 1)
|
||
{
|
||
register int offset;
|
||
register HIST_ENTRY *current, *old;
|
||
char *chars_to_add, *new_line;
|
||
|
||
/* If we are not within a delimited expression, try to be smart
|
||
about which separators can be semi-colons and which must be
|
||
newlines. */
|
||
if (!delimiter)
|
||
{
|
||
register int i;
|
||
|
||
chars_to_add = (char *)NULL;
|
||
|
||
for (i = 0; no_semi_successors[i]; i++)
|
||
{
|
||
if (token_before_that == no_semi_successors[i])
|
||
{
|
||
chars_to_add = " ";
|
||
break;
|
||
}
|
||
}
|
||
if (!chars_to_add)
|
||
chars_to_add = "; ";
|
||
}
|
||
else
|
||
chars_to_add = "\n";
|
||
|
||
using_history ();
|
||
|
||
current = previous_history ();
|
||
|
||
if (current)
|
||
{
|
||
offset = where_history ();
|
||
new_line = (char *) xmalloc (1
|
||
+ strlen (current->line)
|
||
+ strlen (line)
|
||
+ strlen (chars_to_add));
|
||
sprintf (new_line, "%s%s%s", current->line, chars_to_add, line);
|
||
old = replace_history_entry (offset, new_line, current->data);
|
||
free (new_line);
|
||
|
||
if (old)
|
||
{
|
||
/* Note that the old data is not freed, since it was simply
|
||
copied to the new history entry. */
|
||
if (old->line)
|
||
free (old->line);
|
||
|
||
free (old);
|
||
}
|
||
add_it = 0;
|
||
}
|
||
}
|
||
|
||
if (add_it)
|
||
{
|
||
extern int history_lines_this_session;
|
||
|
||
add_history (line);
|
||
history_lines_this_session++;
|
||
}
|
||
using_history ();
|
||
}
|
||
|
||
/* Issue a prompt, or prepare to issue a prompt when the next character
|
||
is read. */
|
||
prompt_again ()
|
||
{
|
||
char *temp_prompt, *decode_prompt_string ();
|
||
|
||
ps1_prompt = get_string_value ("PS1");
|
||
ps2_prompt = get_string_value ("PS2");
|
||
|
||
if (!prompt_string_pointer)
|
||
prompt_string_pointer = &ps1_prompt;
|
||
|
||
if (*prompt_string_pointer)
|
||
temp_prompt = decode_prompt_string (*prompt_string_pointer);
|
||
else
|
||
temp_prompt = savestring ("");
|
||
|
||
current_prompt_string = *prompt_string_pointer;
|
||
prompt_string_pointer = &ps2_prompt;
|
||
|
||
#if defined (READLINE)
|
||
if (!no_line_editing)
|
||
{
|
||
if (current_readline_prompt)
|
||
free (current_readline_prompt);
|
||
|
||
current_readline_prompt = temp_prompt;
|
||
}
|
||
else
|
||
#endif /* READLINE */
|
||
{
|
||
if (interactive)
|
||
{
|
||
fprintf (stderr, "%s", temp_prompt);
|
||
fflush (stderr);
|
||
}
|
||
free (temp_prompt);
|
||
}
|
||
}
|
||
|
||
#include "maxpath.h"
|
||
|
||
/* Return a string which will be printed as a prompt. The string
|
||
may contain special characters which are decoded as follows:
|
||
|
||
\t the time
|
||
\d the date
|
||
\n CRLF
|
||
\s the name of the shell
|
||
\w the current working directory
|
||
\W the last element of PWD
|
||
\u your username
|
||
\h the hostname
|
||
\# the command number of this command
|
||
\! the history number of this command
|
||
\$ a $ or a # if you are root
|
||
\<octal> character code in octal
|
||
\\ a backslash
|
||
*/
|
||
#include <sys/param.h>
|
||
#include <time.h>
|
||
|
||
#define PROMPT_GROWTH 50
|
||
char *
|
||
decode_prompt_string (string)
|
||
char *string;
|
||
{
|
||
int result_size = PROMPT_GROWTH;
|
||
int result_index = 0;
|
||
char *result = (char *)xmalloc (PROMPT_GROWTH);
|
||
int c;
|
||
char *temp = (char *)NULL;
|
||
|
||
result[0] = 0;
|
||
while (c = *string++)
|
||
{
|
||
if (c == '\\')
|
||
{
|
||
c = *string;
|
||
|
||
switch (c)
|
||
{
|
||
case '0':
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7':
|
||
{
|
||
char octal_string[4];
|
||
int n;
|
||
|
||
strncpy (octal_string, string, 3);
|
||
octal_string[3] = '\0';
|
||
|
||
n = read_octal (octal_string);
|
||
|
||
temp = savestring ("\\");
|
||
if (n != -1)
|
||
{
|
||
string += 3;
|
||
temp[0] = n;
|
||
}
|
||
|
||
c = 0;
|
||
goto add_string;
|
||
}
|
||
|
||
case 't':
|
||
case 'd':
|
||
/* Make the current time/date into a string. */
|
||
{
|
||
long the_time = time (0);
|
||
char *ttemp = ctime (&the_time);
|
||
temp = savestring (ttemp);
|
||
|
||
if (c == 't')
|
||
{
|
||
strcpy (temp, temp + 11);
|
||
temp[8] = '\0';
|
||
}
|
||
else
|
||
temp[10] = '\0';
|
||
|
||
goto add_string;
|
||
}
|
||
|
||
case 'n':
|
||
if (!no_line_editing)
|
||
temp = savestring ("\r\n");
|
||
else
|
||
temp = savestring ("\n");
|
||
goto add_string;
|
||
|
||
case 's':
|
||
{
|
||
extern char *shell_name;
|
||
temp = savestring (shell_name);
|
||
goto add_string;
|
||
}
|
||
|
||
case 'w':
|
||
case 'W':
|
||
{
|
||
/* Use the value of PWD because it is much more effecient. */
|
||
#define EFFICIENT
|
||
#ifdef EFFICIENT
|
||
char *polite_directory_format (), t_string[MAXPATHLEN];
|
||
|
||
temp = get_string_value ("PWD");
|
||
|
||
if (!temp)
|
||
getwd (t_string);
|
||
else
|
||
strcpy (t_string, temp);
|
||
#else
|
||
getwd (t_string);
|
||
#endif /* EFFICIENT */
|
||
|
||
if (c == 'W')
|
||
{
|
||
char *dir = (char *)rindex (t_string, '/');
|
||
if (dir && dir != t_string)
|
||
strcpy (t_string, dir + 1);
|
||
temp = savestring (t_string);
|
||
}
|
||
else
|
||
temp = savestring (polite_directory_format (t_string));
|
||
goto add_string;
|
||
}
|
||
|
||
case 'u':
|
||
{
|
||
extern char *current_user_name;
|
||
temp = savestring (current_user_name);
|
||
|
||
goto add_string;
|
||
}
|
||
|
||
case 'h':
|
||
{
|
||
extern char *current_host_name;
|
||
char *t_string;
|
||
|
||
temp = savestring (current_host_name);
|
||
if (t_string = (char *)index (temp, '.'))
|
||
*t_string = '\0';
|
||
|
||
goto add_string;
|
||
}
|
||
|
||
case '#':
|
||
{
|
||
extern int current_command_number;
|
||
char number_buffer[20];
|
||
sprintf (number_buffer, "%d", current_command_number);
|
||
temp = savestring (number_buffer);
|
||
goto add_string;
|
||
}
|
||
|
||
case '!':
|
||
{
|
||
extern int history_base, where_history ();
|
||
char number_buffer[20];
|
||
|
||
using_history ();
|
||
if (get_string_value ("HISTSIZE"))
|
||
sprintf (number_buffer, "%d",
|
||
history_base + where_history ());
|
||
else
|
||
strcpy (number_buffer, "!");
|
||
temp = savestring (number_buffer);
|
||
goto add_string;
|
||
}
|
||
|
||
case '$':
|
||
temp = savestring (geteuid () == 0 ? "#" : "$");
|
||
goto add_string;
|
||
|
||
case '\\':
|
||
temp = savestring ("\\");
|
||
goto add_string;
|
||
|
||
default:
|
||
temp = savestring ("\\ ");
|
||
temp[1] = c;
|
||
|
||
add_string:
|
||
if (c)
|
||
string++;
|
||
result =
|
||
(char *)sub_append_string (temp, result,
|
||
&result_index, &result_size);
|
||
temp = (char *)NULL; /* Free ()'ed in sub_append_string (). */
|
||
result[result_index] = '\0';
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
while (3 + result_index > result_size)
|
||
result = (char *)xrealloc (result, result_size += PROMPT_GROWTH);
|
||
|
||
result[result_index++] = c;
|
||
result[result_index] = '\0';
|
||
}
|
||
}
|
||
|
||
/* I don't really think that this is a good idea. Do you? */
|
||
if (!find_variable ("NO_PROMPT_VARS"))
|
||
{
|
||
WORD_LIST *expand_string (), *list;
|
||
char *string_list ();
|
||
|
||
list = expand_string (result, 1);
|
||
free (result);
|
||
result = string_list (list);
|
||
dispose_words (list);
|
||
}
|
||
|
||
return (result);
|
||
}
|
||
|
||
/* Report a syntax error, and restart the parser. Call here for fatal
|
||
errors. */
|
||
yyerror ()
|
||
{
|
||
report_syntax_error ((char *)NULL);
|
||
reset_parser ();
|
||
}
|
||
|
||
/* Report a syntax error with line numbers, etc.
|
||
Call here for recoverable errors. If you have a message to print,
|
||
then place it in MESSAGE, otherwise pass NULL and this will figure
|
||
out an appropriate message for you. */
|
||
report_syntax_error (message)
|
||
char *message;
|
||
{
|
||
if (message)
|
||
{
|
||
if (!interactive)
|
||
{
|
||
char *name = stream_name ? stream_name : "stdin";
|
||
report_error ("%s:%d: `%s'", name, line_number, message);
|
||
}
|
||
else
|
||
report_error ("%s", message);
|
||
|
||
return;
|
||
}
|
||
|
||
if (shell_input_line && *shell_input_line)
|
||
{
|
||
char *error_token, *t = shell_input_line;
|
||
register int i = shell_input_line_index;
|
||
int token_end = 0;
|
||
|
||
if (!t[i] && i)
|
||
i--;
|
||
|
||
while (i && (t[i] == ' ' || t[i] == '\t' || t[i] == '\n'))
|
||
i--;
|
||
|
||
if (i)
|
||
token_end = i + 1;
|
||
|
||
while (i && !member (t[i], " \n\t;|&"))
|
||
i--;
|
||
|
||
while (i != token_end && member (t[i], " \n\t"))
|
||
i++;
|
||
|
||
if (token_end)
|
||
{
|
||
error_token = (char *)alloca (1 + (token_end - i));
|
||
strncpy (error_token, t + i, token_end - i);
|
||
error_token[token_end - i] = '\0';
|
||
|
||
report_error ("syntax error near `%s'", error_token);
|
||
}
|
||
else if ((i == 0) && (token_end == 0)) /* a 1-character token */
|
||
{
|
||
error_token = (char *) alloca (2);
|
||
strncpy(error_token, t + i, 1);
|
||
error_token[1] = '\0';
|
||
|
||
report_error ("syntax error near `%s'", error_token);
|
||
}
|
||
|
||
if (!interactive)
|
||
{
|
||
char *temp = savestring (shell_input_line);
|
||
char *name = stream_name ? stream_name : "stdin";
|
||
int l = strlen (temp);
|
||
|
||
while (l && temp[l - 1] == '\n')
|
||
temp[--l] = '\0';
|
||
|
||
report_error ("%s:%d: `%s'", name, line_number, temp);
|
||
free (temp);
|
||
}
|
||
}
|
||
else
|
||
report_error ("Syntax error");
|
||
}
|
||
|
||
/* ??? Needed function. ??? We have to be able to discard the constructs
|
||
created during parsing. In the case of error, we want to return
|
||
allocated objects to the memory pool. In the case of no error, we want
|
||
to throw away the information about where the allocated objects live.
|
||
(dispose_command () will actually free the command. */
|
||
discard_parser_constructs (error_p)
|
||
int error_p;
|
||
{
|
||
/* if (error_p) {
|
||
fprintf (stderr, "*");
|
||
} */
|
||
}
|
||
|
||
/* Do that silly `type "bye" to exit' stuff. You know, "ignoreeof". */
|
||
|
||
/* The number of times that we have encountered an EOF character without
|
||
another character intervening. When this gets above the limit, the
|
||
shell terminates. */
|
||
int eof_encountered = 0;
|
||
|
||
/* The limit for eof_encountered. */
|
||
int eof_encountered_limit = 10;
|
||
|
||
/* If we have EOF as the only input unit, this user wants to leave
|
||
the shell. If the shell is not interactive, then just leave.
|
||
Otherwise, if ignoreeof is set, and we haven't done this the
|
||
required number of times in a row, print a message. */
|
||
handle_eof_input_unit ()
|
||
{
|
||
extern int login_shell, EOF_Reached;
|
||
|
||
if (interactive)
|
||
{
|
||
/* If the user wants to "ignore" eof, then let her do so, kind of. */
|
||
if (find_variable ("ignoreeof") || find_variable ("IGNOREEOF"))
|
||
{
|
||
if (eof_encountered < eof_encountered_limit)
|
||
{
|
||
fprintf (stderr, "Use \"%s\" to leave the shell.\n",
|
||
login_shell ? "logout" : "exit");
|
||
eof_encountered++;
|
||
/* Reset the prompt string to be $PS1. */
|
||
prompt_string_pointer = (char **)NULL;
|
||
prompt_again ();
|
||
last_read_token = current_token = '\n';
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* In this case EOF should exit the shell. Do it now. */
|
||
reset_parser ();
|
||
exit_builtin ((WORD_LIST *)NULL);
|
||
}
|
||
else
|
||
{
|
||
/* We don't write history files, etc., for non-interactive shells. */
|
||
EOF_Reached = 1;
|
||
}
|
||
}
|