109 lines
4.4 KiB
C
109 lines
4.4 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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/* Shell variables and functions are stored in hash tables. */
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#include "hash.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 /* %00000001 (export to environment) */
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#define att_readonly 0x02 /* %00000010 (cannot change) */
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#define att_invisible 0x04 /* %00000100 (cannot see) */
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#define att_array 0x08 /* %00001000 (value is an array) */
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#define att_nounset 0x10 /* %00010000 (cannot unset) */
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#define att_function 0x20 /* %00100000 (value is a function) */
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#define att_integer 0x40 /* %01000000 (internal rep. is int) */
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#define att_imported 0x80 /* %10000000 (came from environment) */
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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 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 value_cell(var) ((var)->value)
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#define function_cell(var) (COMMAND *)((var)->value)
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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 **));
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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 *set_if_not __P((char *, char *));
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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 __P((char *, char **));
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extern char *get_string_value __P((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_function_env __P((void));
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extern void dispose_builtin_env __P((void));
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extern void dispose_used_env_vars __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_char_array __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 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 *));
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extern void print_var_function __P((SHELL_VAR *));
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#endif /* !_VARIABLES_H_ */
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