mirror of https://github.com/n-hys/bash.git
137 lines
5.6 KiB
C
137 lines
5.6 KiB
C
/* variables.h -- data structures for shell variables. */
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#if !defined (_VARIABLES_H_)
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#define _VARIABLES_H_
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#include "stdc.h"
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#include "array.h"
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/* Shell variables and functions are stored in hash tables. */
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#include "hashlib.h"
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/* What a shell variable looks like. */
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typedef struct variable *DYNAMIC_FUNC ();
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typedef struct variable {
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char *name; /* Symbol that the user types. */
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char *value; /* Value that is returned. */
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DYNAMIC_FUNC *dynamic_value; /* Function called to return a `dynamic'
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value for a variable, like $SECONDS
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or $RANDOM. */
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DYNAMIC_FUNC *assign_func; /* Function called when this `special
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variable' is assigned a value in
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bind_variable. */
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int attributes; /* export, readonly, array, invisible... */
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int context; /* Which context this variable belongs to. */
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struct variable *prev_context; /* Value from previous context or NULL. */
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} SHELL_VAR;
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/* The various attributes that a given variable can have.
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We only reserve one byte of the INT. */
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#define att_exported 0x01 /* export to environment */
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#define att_readonly 0x02 /* cannot change */
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#define att_invisible 0x04 /* cannot see */
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#define att_array 0x08 /* value is an array */
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#define att_nounset 0x10 /* cannot unset */
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#define att_function 0x20 /* value is a function */
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#define att_integer 0x40 /* internal representation is int */
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#define att_imported 0x80 /* came from environment */
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#define att_local 0x100 /* variable is local to a function */
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#define exported_p(var) ((((var)->attributes) & (att_exported)))
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#define readonly_p(var) ((((var)->attributes) & (att_readonly)))
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#define invisible_p(var) ((((var)->attributes) & (att_invisible)))
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#define array_p(var) ((((var)->attributes) & (att_array)))
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#define non_unsettable_p(var) ((((var)->attributes) & (att_nounset)))
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#define function_p(var) ((((var)->attributes) & (att_function)))
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#define integer_p(var) ((((var)->attributes) & (att_integer)))
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#define imported_p(var) ((((var)->attributes) & (att_imported)))
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#define local_p(var) ((((var)->attributes) & (att_local)))
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#define value_cell(var) ((var)->value)
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#define function_cell(var) (COMMAND *)((var)->value)
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#define array_cell(var) ((ARRAY *)(var)->value)
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#define SETVARATTR(var, attr, undo) \
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((undo == 0) ? ((var)->attributes |= (attribute)) \
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: ((var)->attributes &= ~(attribute)))
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/* Stuff for hacking variables. */
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extern int variable_context;
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extern HASH_TABLE *shell_variables, *shell_functions;
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extern char *dollar_vars[];
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extern char **export_env;
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extern char **non_unsettable_vars;
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extern void initialize_shell_variables __P((char **, int));
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extern SHELL_VAR *set_if_not __P((char *, char *));
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extern void set_lines_and_columns __P((int, int));
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extern SHELL_VAR *find_function __P((char *));
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extern SHELL_VAR *find_variable __P((char *));
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extern SHELL_VAR *find_variable_internal __P((char *, int));
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extern SHELL_VAR *find_tempenv_variable __P((char *));
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extern SHELL_VAR *copy_variable __P((SHELL_VAR *));
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extern SHELL_VAR *make_local_variable __P((char *));
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extern SHELL_VAR *bind_variable __P((char *, char *));
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extern SHELL_VAR *bind_function __P((char *, COMMAND *));
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extern SHELL_VAR **map_over __P((Function *, HASH_TABLE *));
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extern SHELL_VAR **all_shell_variables __P((void));
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extern SHELL_VAR **all_shell_functions __P((void));
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extern SHELL_VAR **all_visible_variables __P((void));
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extern SHELL_VAR **all_visible_functions __P((void));
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extern char **make_var_array __P((HASH_TABLE *));
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extern char **add_or_supercede_exported_var __P((char *, int));
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extern char *get_string_value __P((char *));
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extern char *make_variable_value __P((SHELL_VAR *, char *));
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extern int assignment __P((char *));
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extern int variable_in_context __P((SHELL_VAR *));
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extern int assign_in_env __P((char *));
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extern int unbind_variable __P((char *));
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extern int makunbound __P((char *, HASH_TABLE *));
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extern int kill_local_variable __P((char *));
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extern void delete_all_variables __P((HASH_TABLE *));
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extern void adjust_shell_level __P((int));
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extern void non_unsettable __P((char *));
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extern void dispose_variable __P((SHELL_VAR *));
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extern void dispose_used_env_vars __P((void));
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extern void dispose_function_env __P((void));
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extern void dispose_builtin_env __P((void));
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extern void merge_temporary_env __P((void));
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extern void merge_builtin_env __P((void));
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extern void kill_all_local_variables __P((void));
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extern void set_var_read_only __P((char *));
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extern void set_func_read_only __P((char *));
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extern void set_var_auto_export __P((char *));
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extern void set_func_auto_export __P((char *));
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extern void sort_variables __P((SHELL_VAR **));
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extern void maybe_make_export_env __P((void));
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extern void put_command_name_into_env __P((char *));
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extern void put_gnu_argv_flags_into_env __P((int, char *));
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extern void print_var_list __P((SHELL_VAR **));
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extern void print_assignment __P((SHELL_VAR *));
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extern void print_var_value __P((SHELL_VAR *, int));
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extern void print_var_function __P((SHELL_VAR *));
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extern char *indirection_level_string __P((void));
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#if defined (ARRAY_VARS)
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extern SHELL_VAR *make_new_array_variable __P((char *));
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extern SHELL_VAR *make_local_array_variable __P((char *));
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extern SHELL_VAR *convert_var_to_array __P((SHELL_VAR *));
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extern SHELL_VAR *bind_array_variable __P((char *, int, char *));
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extern SHELL_VAR *assign_array_from_string __P((char *, char *));
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extern SHELL_VAR *assign_array_var_from_word_list __P((SHELL_VAR *, WORD_LIST *));
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extern SHELL_VAR *assign_array_var_from_string __P((SHELL_VAR *, char *));
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extern int unbind_array_element __P((SHELL_VAR *, char *));
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extern int skipsubscript __P((char *, int));
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extern void print_array_assignment __P((SHELL_VAR *, int));
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#endif
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#endif /* !_VARIABLES_H_ */
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