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command.h

/* 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.

   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 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, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */

#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
};

/* 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 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)

#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_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 };

/* Possible values for the `flags' field of a WORD_DESC. */
#define W_HASDOLLAR     0x01  /* Dollar sign present. */
#define W_QUOTED  0x02  /* Some form of quote character is present. */
#define W_ASSIGNMENT    0x04  /* This word is a variable assignment. */
#define W_GLOBEXP 0x08  /* This word is the result of a glob expansion. */
#define W_NOSPLIT 0x10  /* Do not perform word splitting on this word. */
#define W_NOGLOB  0x20  /* Do not perform globbing on this word. */
#define W_NOSPLIT2      0x40  /* Don't split word except for $@ expansion. */
#define W_TILDEEXP      0x80  /* Tilde expand this assignment word */

/* 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 */

/* 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. */
  int redirector;       /* Descriptor to be redirected. */
  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 <<foo. */
} REDIRECT;

/* An element used in parsing.  A single word or a single redirection.
   This is an ephemeral construct. */
typedef struct element {
  WORD_DESC *word;
  REDIRECT *redirect;
} ELEMENT;

/* Possible values for command->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 </dev/null */
#define CMD_COMMAND_BUILTIN 0x0800 /* command executed by `command' builtin */

/* What a command looks like. */
typedef struct command {
  enum command_type type;     /* FOR CASE WHILE IF CONNECTION or SIMPLE. */
  int flags;                  /* Flags controlling execution environment. */
  int line;             /* line number the command starts on */
  REDIRECT *redirects;        /* Special redirects for FOR CASE, etc. */
  union {
    struct for_com *For;
    struct case_com *Case;
    struct while_com *While;
    struct if_com *If;
    struct connection *Connection;
    struct simple_com *Simple;
    struct function_def *Function_def;
    struct group_com *Group;
#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;
  } value;
} COMMAND;

/* Structure used to represent the CONNECTION type. */
typedef struct connection {
  int ignore;                 /* Unused; simplifies make_command (). */
  COMMAND *first;       /* Pointer to the first command. */
  COMMAND *second;            /* Pointer to the second command. */
  int connector;        /* What separates this command from others. */
} CONNECTION;

/* Structures used to represent the CASE command. */

/* 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. */
} PATTERN_LIST;

/* The CASE command. */
typedef struct case_com {
  int flags;                  /* See description of CMD flags. */
  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. */
  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.
                     During execution, NAME is bound to successive
                     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. */
  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.
                     During execution, NAME is bound to the member of
                     MAP_LIST chosen by the user. */
} SELECT_COM;
#endif /* SELECT_COMMAND */

/* IF command. */
typedef struct if_com {
  int flags;                  /* See description of CMD flags. */
  COMMAND *test;        /* Thing to test. */
  COMMAND *true_case;         /* What to do if the test returned non-zero. */
  COMMAND *false_case;        /* What to do if the test returned zero. */
} IF_COM;

/* WHILE command. */
typedef struct while_com {
  int flags;                  /* See description of CMD flags. */
  COMMAND *test;        /* Thing to test. */
  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;
  WORD_LIST *exp;
  int line;
} ARITH_COM;
#endif /* DPAREN_ARITHMETIC */

/* The conditional command, [[...]].  This is a binary tree -- we slippped
   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. */
  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 definition" command. */
typedef struct function_def {
  int flags;                  /* See description of CMD flags. */
  WORD_DESC *name;            /* The name of the function. */
  COMMAND *command;           /* The parsed execution tree. */
  int line;             /* Line number the function def starts on. */
} FUNCTION_DEF;

/* 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;
  COMMAND *command;
} SUBSHELL_COM;

extern COMMAND *global_command;

/* 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 *));

#endif /* _COMMAND_H_ */

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