From 772f20abb0a3a0979c440114bf3a1cff5b3cef03 Mon Sep 17 00:00:00 2001 From: cvpcs Date: Wed, 2 Jun 2010 11:02:31 -0500 Subject: initial import of bash 4.1 --- command.h | 384 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 384 insertions(+) create mode 100644 command.h (limited to 'command.h') diff --git a/command.h b/command.h new file mode 100644 index 0000000..4707812 --- /dev/null +++ b/command.h @@ -0,0 +1,384 @@ +/* command.h -- The structures used internally to represent commands, and + the extern declarations of the functions used to create them. */ + +/* Copyright (C) 1993-2009 Free Software Foundation, Inc. + + This file is part of GNU Bash, the Bourne Again SHell. + + Bash is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Bash is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with Bash. If not, see . +*/ + +#if !defined (_COMMAND_H_) +#define _COMMAND_H_ + +#include "stdc.h" + +/* Instructions describing what kind of thing to do for a redirection. */ +enum r_instruction { + r_output_direction, r_input_direction, r_inputa_direction, + r_appending_to, r_reading_until, r_reading_string, + r_duplicating_input, r_duplicating_output, r_deblank_reading_until, + r_close_this, r_err_and_out, r_input_output, r_output_force, + r_duplicating_input_word, r_duplicating_output_word, + r_move_input, r_move_output, r_move_input_word, r_move_output_word, + r_append_err_and_out +}; + +/* Redirection flags; values for rflags */ +#define REDIR_VARASSIGN 0x01 + +/* Redirection errors. */ +#define AMBIGUOUS_REDIRECT -1 +#define NOCLOBBER_REDIRECT -2 +#define RESTRICTED_REDIRECT -3 /* can only happen in restricted shells. */ +#define HEREDOC_REDIRECT -4 /* here-doc temp file can't be created */ +#define BADVAR_REDIRECT -5 /* something wrong with {varname}redir */ + +#define CLOBBERING_REDIRECT(ri) \ + (ri == r_output_direction || ri == r_err_and_out) + +#define OUTPUT_REDIRECT(ri) \ + (ri == r_output_direction || ri == r_input_output || ri == r_err_and_out || ri == r_append_err_and_out) + +#define INPUT_REDIRECT(ri) \ + (ri == r_input_direction || ri == r_inputa_direction || ri == r_input_output) + +#define WRITE_REDIRECT(ri) \ + (ri == r_output_direction || \ + ri == r_input_output || \ + ri == r_err_and_out || \ + ri == r_appending_to || \ + ri == r_append_err_and_out || \ + ri == r_output_force) + +/* redirection needs translation */ +#define TRANSLATE_REDIRECT(ri) \ + (ri == r_duplicating_input_word || ri == r_duplicating_output_word || \ + ri == r_move_input_word || ri == r_move_output_word) + +/* Command Types: */ +enum command_type { cm_for, cm_case, cm_while, cm_if, cm_simple, cm_select, + cm_connection, cm_function_def, cm_until, cm_group, + cm_arith, cm_cond, cm_arith_for, cm_subshell, cm_coproc }; + +/* Possible values for the `flags' field of a WORD_DESC. */ +#define W_HASDOLLAR 0x000001 /* Dollar sign present. */ +#define W_QUOTED 0x000002 /* Some form of quote character is present. */ +#define W_ASSIGNMENT 0x000004 /* This word is a variable assignment. */ +#define W_GLOBEXP 0x000008 /* This word is the result of a glob expansion. */ +#define W_NOSPLIT 0x000010 /* Do not perform word splitting on this word because ifs is empty string. */ +#define W_NOGLOB 0x000020 /* Do not perform globbing on this word. */ +#define W_NOSPLIT2 0x000040 /* Don't split word except for $@ expansion (using spaces) because context does not allow it. */ +#define W_TILDEEXP 0x000080 /* Tilde expand this assignment word */ +#define W_DOLLARAT 0x000100 /* $@ and its special handling */ +#define W_DOLLARSTAR 0x000200 /* $* and its special handling */ +#define W_NOCOMSUB 0x000400 /* Don't perform command substitution on this word */ +#define W_ASSIGNRHS 0x000800 /* Word is rhs of an assignment statement */ +#define W_NOTILDE 0x001000 /* Don't perform tilde expansion on this word */ +#define W_ITILDE 0x002000 /* Internal flag for word expansion */ +#define W_NOEXPAND 0x004000 /* Don't expand at all -- do quote removal */ +#define W_COMPASSIGN 0x008000 /* Compound assignment */ +#define W_ASSNBLTIN 0x010000 /* word is a builtin command that takes assignments */ +#define W_ASSIGNARG 0x020000 /* word is assignment argument to command */ +#define W_HASQUOTEDNULL 0x040000 /* word contains a quoted null character */ +#define W_DQUOTE 0x080000 /* word should be treated as if double-quoted */ +#define W_NOPROCSUB 0x100000 /* don't perform process substitution */ +#define W_HASCTLESC 0x200000 /* word contains literal CTLESC characters */ +#define W_ASSIGNASSOC 0x400000 /* word looks like associative array assignment */ + +/* Possible values for subshell_environment */ +#define SUBSHELL_ASYNC 0x01 /* subshell caused by `command &' */ +#define SUBSHELL_PAREN 0x02 /* subshell caused by ( ... ) */ +#define SUBSHELL_COMSUB 0x04 /* subshell caused by `command` or $(command) */ +#define SUBSHELL_FORK 0x08 /* subshell caused by executing a disk command */ +#define SUBSHELL_PIPE 0x10 /* subshell from a pipeline element */ +#define SUBSHELL_PROCSUB 0x20 /* subshell caused by <(command) or >(command) */ +#define SUBSHELL_COPROC 0x40 /* subshell from a coproc pipeline */ + +/* A structure which represents a word. */ +typedef struct word_desc { + char *word; /* Zero terminated string. */ + int flags; /* Flags associated with this word. */ +} WORD_DESC; + +/* A linked list of words. */ +typedef struct word_list { + struct word_list *next; + WORD_DESC *word; +} WORD_LIST; + + +/* **************************************************************** */ +/* */ +/* Shell Command Structs */ +/* */ +/* **************************************************************** */ + +/* What a redirection descriptor looks like. If the redirection instruction + is ri_duplicating_input or ri_duplicating_output, use DEST, otherwise + use the file in FILENAME. Out-of-range descriptors are identified by a + negative DEST. */ + +typedef union { + int dest; /* Place to redirect REDIRECTOR to, or ... */ + WORD_DESC *filename; /* filename to redirect to. */ +} REDIRECTEE; + +/* Structure describing a redirection. If REDIRECTOR is negative, the parser + (or translator in redir.c) encountered an out-of-range file descriptor. */ +typedef struct redirect { + struct redirect *next; /* Next element, or NULL. */ + REDIRECTEE redirector; /* Descriptor or varname to be redirected. */ + int rflags; /* Private flags for this redirection */ + int flags; /* Flag value for `open'. */ + enum r_instruction instruction; /* What to do with the information. */ + REDIRECTEE redirectee; /* File descriptor or filename */ + char *here_doc_eof; /* The word that appeared in <flags. */ +#define CMD_WANT_SUBSHELL 0x01 /* User wants a subshell: ( command ) */ +#define CMD_FORCE_SUBSHELL 0x02 /* Shell needs to force a subshell. */ +#define CMD_INVERT_RETURN 0x04 /* Invert the exit value. */ +#define CMD_IGNORE_RETURN 0x08 /* Ignore the exit value. For set -e. */ +#define CMD_NO_FUNCTIONS 0x10 /* Ignore functions during command lookup. */ +#define CMD_INHIBIT_EXPANSION 0x20 /* Do not expand the command words. */ +#define CMD_NO_FORK 0x40 /* Don't fork; just call execve */ +#define CMD_TIME_PIPELINE 0x80 /* Time a pipeline */ +#define CMD_TIME_POSIX 0x100 /* time -p; use POSIX.2 time output spec. */ +#define CMD_AMPERSAND 0x200 /* command & */ +#define CMD_STDIN_REDIR 0x400 /* async command needs implicit