/* command.h -- The structures used internally to represent commands, and
the extern declarations of the functions used to create them. */
-/* Copyright (C) 1993 Free Software Foundation, Inc.
+/* Copyright (C) 1993-2021 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 2, or (at your option) any later
- version.
+ 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.
+ 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; see the file COPYING. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
-#if !defined (_COMMAND_H)
-#define _COMMAND_H
+#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_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_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_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 (1 << 0) /* Dollar sign present. */
+#define W_QUOTED (1 << 1) /* Some form of quote character is present. */
+#define W_ASSIGNMENT (1 << 2) /* This word is a variable assignment. */
+#define W_SPLITSPACE (1 << 3) /* Split this word on " " regardless of IFS */
+#define W_NOSPLIT (1 << 4) /* Do not perform word splitting on this word because ifs is empty string. */
+#define W_NOGLOB (1 << 5) /* Do not perform globbing on this word. */
+#define W_NOSPLIT2 (1 << 6) /* Don't split word except for $@ expansion (using spaces) because context does not allow it. */
+#define W_TILDEEXP (1 << 7) /* Tilde expand this assignment word */
+#define W_DOLLARAT (1 << 8) /* UNUSED - $@ and its special handling */
+#define W_ARRAYREF (1 << 9) /* word is a valid array reference */
+#define W_NOCOMSUB (1 << 10) /* Don't perform command substitution on this word */
+#define W_ASSIGNRHS (1 << 11) /* Word is rhs of an assignment statement */
+#define W_NOTILDE (1 << 12) /* Don't perform tilde expansion on this word */
+#define W_NOASSNTILDE (1 << 13) /* don't do tilde expansion like an assignment statement */
+#define W_EXPANDRHS (1 << 14) /* Expanding word in ${paramOPword} */
+#define W_COMPASSIGN (1 << 15) /* Compound assignment */
+#define W_ASSNBLTIN (1 << 16) /* word is a builtin command that takes assignments */
+#define W_ASSIGNARG (1 << 17) /* word is assignment argument to command */
+#define W_HASQUOTEDNULL (1 << 18) /* word contains a quoted null character */
+#define W_DQUOTE (1 << 19) /* UNUSED - word should be treated as if double-quoted */
+#define W_NOPROCSUB (1 << 20) /* don't perform process substitution */
+#define W_SAWQUOTEDNULL (1 << 21) /* word contained a quoted null that was removed */
+#define W_ASSIGNASSOC (1 << 22) /* word looks like associative array assignment */
+#define W_ASSIGNARRAY (1 << 23) /* word looks like a compound indexed array assignment */
+#define W_ARRAYIND (1 << 24) /* word is an array index being expanded */
+#define W_ASSNGLOBAL (1 << 25) /* word is a global assignment to declare (declare/typeset -g) */
+#define W_NOBRACE (1 << 26) /* Don't perform brace expansion */
+#define W_COMPLETE (1 << 27) /* word is being expanded for completion */
+#define W_CHKLOCAL (1 << 28) /* check for local vars on assignment */
+#define W_FORCELOCAL (1 << 29) /* force assignments to be to local variables, non-fatal on assignment errors */
+/* UNUSED (1 << 30) */
+
+/* Flags for the `pflags' argument to param_expand() and various
+ parameter_brace_expand_xxx functions; also used for string_list_dollar_at */
+#define PF_NOCOMSUB 0x01 /* Do not perform command substitution */
+#define PF_IGNUNBOUND 0x02 /* ignore unbound vars even if -u set */
+#define PF_NOSPLIT2 0x04 /* same as W_NOSPLIT2 */
+#define PF_ASSIGNRHS 0x08 /* same as W_ASSIGNRHS */
+#define PF_COMPLETE 0x10 /* same as W_COMPLETE, sets SX_COMPLETE */
+#define PF_EXPANDRHS 0x20 /* same as W_EXPANDRHS */
+#define PF_ALLINDS 0x40 /* array, act as if [@] was supplied */
+#define PF_BACKQUOTE 0x80 /* differentiate `` from $() for command_substitute */
+
+/* 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 */
+#define SUBSHELL_RESETTRAP 0x80 /* subshell needs to reset trap strings on first call to trap */
+#define SUBSHELL_IGNTRAP 0x100 /* subshell should reset trapped signals from trap_handler */
/* A structure which represents a word. */
typedef struct word_desc {
char *word; /* Zero terminated string. */
- int dollar_present; /* Non-zero means dollar sign present. */
- int quoted; /* Non-zero means single, double, or back quote
- or backslash is present. */
- int assignment; /* Non-zero means that this word contains an
- assignment. */
+ int flags; /* Flags associated with this word. */
} WORD_DESC;
/* A linked list of words. */
/* */
/* **************************************************************** */
-/* What a redirection descriptor looks like. If FLAGS is IS_DESCRIPTOR,
- then we use REDIRECTEE.DEST, else we use the file specified. */
+/* 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 {
- long dest; /* Place to redirect REDIRECTOR to, or ... */
+ 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. */
- int redirector; /* Descriptor to be redirected. */
+ 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 */
#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 </dev/null */
+#define CMD_COMMAND_BUILTIN 0x0800 /* command executed by `command' builtin */
+#define CMD_COPROC_SUBSHELL 0x1000
+#define CMD_LASTPIPE 0x2000
+#define CMD_STDPATH 0x4000 /* use standard path for command lookup */
+#define CMD_TRY_OPTIMIZING 0x8000 /* try to optimize this simple command */
/* What a command looks like. */
typedef struct command {
#if defined (SELECT_COMMAND)
struct select_com *Select;
#endif
+#if defined (DPAREN_ARITHMETIC)
+ struct arith_com *Arith;
+#endif
+#if defined (COND_COMMAND)
+ struct cond_com *Cond;
+#endif
+#if defined (ARITH_FOR_COMMAND)
+ struct arith_for_com *ArithFor;
+#endif
+ struct subshell_com *Subshell;
+ struct coproc_com *Coproc;
} value;
} COMMAND;
/* Structures used to represent the CASE command. */
+/* Values for FLAGS word in a PATTERN_LIST */
+#define CASEPAT_FALLTHROUGH 0x01
+#define CASEPAT_TESTNEXT 0x02
+
/* Pattern/action structure for CASE_COM. */
typedef struct pattern_list {
struct pattern_list *next; /* Clause to try in case this one failed. */
WORD_LIST *patterns; /* Linked list of patterns to test. */
COMMAND *action; /* Thing to execute if a pattern matches. */
+ int flags;
} PATTERN_LIST;
/* The CASE command. */
typedef struct case_com {
int flags; /* See description of CMD flags. */
+ int line; /* line number the `case' keyword appears on */
WORD_DESC *word; /* The thing to test. */
PATTERN_LIST *clauses; /* The clauses to test against, or NULL. */
} CASE_COM;
/* FOR command. */
typedef struct for_com {
int flags; /* See description of CMD flags. */
+ int line; /* line number the `for' keyword appears on */
WORD_DESC *name; /* The variable name to get mapped over. */
WORD_LIST *map_list; /* The things to map over. This is never NULL. */
COMMAND *action; /* The action to execute.
members of MAP_LIST. */
} FOR_COM;
+#if defined (ARITH_FOR_COMMAND)
+typedef struct arith_for_com {
+ int flags;
+ int line; /* generally used for error messages */
+ WORD_LIST *init;
+ WORD_LIST *test;
+ WORD_LIST *step;
+ COMMAND *action;
+} ARITH_FOR_COM;
+#endif
+
#if defined (SELECT_COMMAND)
/* KSH SELECT command. */
typedef struct select_com {
int flags; /* See description of CMD flags. */
+ int line; /* line number the `select' keyword appears on */
WORD_DESC *name; /* The variable name to get mapped over. */
WORD_LIST *map_list; /* The things to map over. This is never NULL. */
COMMAND *action; /* The action to execute.
COMMAND *action; /* Thing to do while test is non-zero. */
} WHILE_COM;
+#if defined (DPAREN_ARITHMETIC)
+/* The arithmetic evaluation command, ((...)). Just a set of flags and
+ a WORD_LIST, of which the first element is the only one used, for the
+ time being. */
+typedef struct arith_com {
+ int flags;
+ int line;
+ WORD_LIST *exp;
+} ARITH_COM;
+#endif /* DPAREN_ARITHMETIC */
+
+/* The conditional command, [[...]]. This is a binary tree -- we slipped
+ a recursive-descent parser into the YACC grammar to parse it. */
+#define COND_AND 1
+#define COND_OR 2
+#define COND_UNARY 3
+#define COND_BINARY 4
+#define COND_TERM 5
+#define COND_EXPR 6
+
+typedef struct cond_com {
+ int flags;
+ int line;
+ int type;
+ WORD_DESC *op;
+ struct cond_com *left, *right;
+} COND_COM;
+
/* The "simple" command. Just a collection of words and redirects. */
typedef struct simple_com {
int flags; /* See description of CMD flags. */
+ int line; /* line number the command starts on */
WORD_LIST *words; /* The program name, the arguments,
variable assignments, etc. */
REDIRECT *redirects; /* Redirections to perform. */
- int line; /* line number the command starts on */
} SIMPLE_COM;
-/* The "function_def" command. This isn't really a command, but it is
- represented as such for now. If the function def appears within
- `(' `)' the parser tries to set the SUBSHELL bit of the command. That
- means that FUNCTION_DEF has to be run through the executor. Maybe this
- command should be defined in a subshell. Who knows or cares. */
+/* The "function definition" command. */
typedef struct function_def {
- int ignore; /* See description of CMD flags. */
+ int flags; /* See description of CMD flags. */
+ int line; /* Line number the function def starts on. */
WORD_DESC *name; /* The name of the function. */
COMMAND *command; /* The parsed execution tree. */
+ char *source_file; /* file in which function was defined, if any */
} FUNCTION_DEF;
-/* A command that is `grouped' allows pipes to take effect over
- the entire command structure. */
+/* A command that is `grouped' allows pipes and redirections to affect all
+ commands in the group. */
typedef struct group_com {
int ignore; /* See description of CMD flags. */
COMMAND *command;
} GROUP_COM;
+typedef struct subshell_com {
+ int flags;
+ int line;
+ COMMAND *command;
+} SUBSHELL_COM;
+
+#define COPROC_RUNNING 0x01
+#define COPROC_DEAD 0x02
+
+typedef struct coproc {
+ char *c_name;
+ pid_t c_pid;
+ int c_rfd;
+ int c_wfd;
+ int c_rsave;
+ int c_wsave;
+ int c_flags;
+ int c_status;
+ int c_lock;
+} Coproc;
+
+typedef struct coproc_com {
+ int flags;
+ char *name;
+ COMMAND *command;
+} COPROC_COM;
+
extern COMMAND *global_command;
+extern Coproc sh_coproc;
+
+/* Possible command errors */
+#define CMDERR_DEFAULT 0
+#define CMDERR_BADTYPE 1
+#define CMDERR_BADCONN 2
+#define CMDERR_BADJUMP 3
+
+#define CMDERR_LAST 3
/* Forward declarations of functions declared in copy_cmd.c. */
-extern WORD_DESC *copy_word __P((WORD_DESC *));
-extern WORD_LIST *copy_word_list __P((WORD_LIST *));
-extern REDIRECT *copy_redirect __P((REDIRECT *));
-extern REDIRECT *copy_redirects __P((REDIRECT *));
-extern COMMAND *copy_command __P((COMMAND *));
+extern FUNCTION_DEF *copy_function_def_contents PARAMS((FUNCTION_DEF *, FUNCTION_DEF *));
+extern FUNCTION_DEF *copy_function_def PARAMS((FUNCTION_DEF *));
+
+extern WORD_DESC *copy_word PARAMS((WORD_DESC *));
+extern WORD_LIST *copy_word_list PARAMS((WORD_LIST *));
+extern REDIRECT *copy_redirect PARAMS((REDIRECT *));
+extern REDIRECT *copy_redirects PARAMS((REDIRECT *));
+extern COMMAND *copy_command PARAMS((COMMAND *));
-#endif /* _COMMAND_H */
+#endif /* _COMMAND_H_ */
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