/* variables.h -- data structures for shell variables. */
-/* Copyright (C) 1987,1991 Free Software Foundation, Inc.
+/* Copyright (C) 1987-2012 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, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
#if !defined (_VARIABLES_H_)
#define _VARIABLES_H_
#include "stdc.h"
#include "array.h"
+#include "assoc.h"
/* Shell variables and functions are stored in hash tables. */
#include "hashlib.h"
#include "conftypes.h"
+/* A variable context. */
+typedef struct var_context {
+ char *name; /* empty or NULL means global context */
+ int scope; /* 0 means global context */
+ int flags;
+ struct var_context *up; /* previous function calls */
+ struct var_context *down; /* down towards global context */
+ HASH_TABLE *table; /* variables at this scope */
+} VAR_CONTEXT;
+
+/* Flags for var_context->flags */
+#define VC_HASLOCAL 0x01
+#define VC_HASTMPVAR 0x02
+#define VC_FUNCENV 0x04 /* also function if name != NULL */
+#define VC_BLTNENV 0x08 /* builtin_env */
+#define VC_TEMPENV 0x10 /* temporary_env */
+
+#define VC_TEMPFLAGS (VC_FUNCENV|VC_BLTNENV|VC_TEMPENV)
+
+/* Accessing macros */
+#define vc_isfuncenv(vc) (((vc)->flags & VC_FUNCENV) != 0)
+#define vc_isbltnenv(vc) (((vc)->flags & VC_BLTNENV) != 0)
+#define vc_istempenv(vc) (((vc)->flags & (VC_TEMPFLAGS)) == VC_TEMPENV)
+
+#define vc_istempscope(vc) (((vc)->flags & (VC_TEMPENV|VC_BLTNENV)) != 0)
+
+#define vc_haslocals(vc) (((vc)->flags & VC_HASLOCAL) != 0)
+#define vc_hastmpvars(vc) (((vc)->flags & VC_HASTMPVAR) != 0)
+
/* What a shell variable looks like. */
-typedef struct variable *DYNAMIC_FUNC ();
+typedef struct variable *sh_var_value_func_t __P((struct variable *));
+typedef struct variable *sh_var_assign_func_t __P((struct variable *, char *, arrayind_t, char *));
+
+/* For the future */
+union _value {
+ char *s; /* string value */
+ intmax_t i; /* int value */
+ COMMAND *f; /* function */
+ ARRAY *a; /* array */
+ HASH_TABLE *h; /* associative array */
+ double d; /* floating point number */
+#if defined (HAVE_LONG_DOUBLE)
+ long double ld; /* long double */
+#endif
+ struct variable *v; /* possible indirect variable use */
+ void *opaque; /* opaque data for future use */
+};
typedef struct variable {
char *name; /* Symbol that the user types. */
char *value; /* Value that is returned. */
char *exportstr; /* String for the environment. */
- DYNAMIC_FUNC *dynamic_value; /* Function called to return a `dynamic'
+ sh_var_value_func_t *dynamic_value; /* Function called to return a `dynamic'
value for a variable, like $SECONDS
or $RANDOM. */
- DYNAMIC_FUNC *assign_func; /* Function called when this `special
+ sh_var_assign_func_t *assign_func; /* Function called when this `special
variable' is assigned a value in
bind_variable. */
int attributes; /* export, readonly, array, invisible... */
int context; /* Which context this variable belongs to. */
- struct variable *prev_context; /* Value from previous context or NULL. */
} SHELL_VAR;
+typedef struct _vlist {
+ SHELL_VAR **list;
+ int list_size; /* allocated size */
+ int list_len; /* current number of entries */
+} VARLIST;
+
/* The various attributes that a given variable can have. */
-#define att_exported 0x001 /* export to environment */
-#define att_readonly 0x002 /* cannot change */
-#define att_invisible 0x004 /* cannot see */
-#define att_array 0x008 /* value is an array */
-#define att_nounset 0x010 /* cannot unset */
-#define att_function 0x020 /* value is a function */
-#define att_integer 0x040 /* internal representation is int */
-#define att_imported 0x080 /* came from environment */
-#define att_local 0x100 /* variable is local to a function */
-#define att_tempvar 0x200 /* variable came from the temp environment */
-#define att_importstr 0x400 /* exportstr points into initial environment */
-#define att_noassign 0x800 /* assignment not allowed */
+/* First, the user-visible attributes */
+#define att_exported 0x0000001 /* export to environment */
+#define att_readonly 0x0000002 /* cannot change */
+#define att_array 0x0000004 /* value is an array */
+#define att_function 0x0000008 /* value is a function */
+#define att_integer 0x0000010 /* internal representation is int */
+#define att_local 0x0000020 /* variable is local to a function */
+#define att_assoc 0x0000040 /* variable is an associative array */
+#define att_trace 0x0000080 /* function is traced with DEBUG trap */
+#define att_uppercase 0x0000100 /* word converted to uppercase on assignment */
+#define att_lowercase 0x0000200 /* word converted to lowercase on assignment */
+#define att_capcase 0x0000400 /* word capitalized on assignment */
+#define att_nameref 0x0000800 /* word is a name reference */
+
+#define user_attrs (att_exported|att_readonly|att_integer|att_local|att_trace|att_uppercase|att_lowercase|att_capcase|att_nameref)
+
+#define attmask_user 0x0000fff
+
+/* Internal attributes used for bookkeeping */
+#define att_invisible 0x0001000 /* cannot see */
+#define att_nounset 0x0002000 /* cannot unset */
+#define att_noassign 0x0004000 /* assignment not allowed */
+#define att_imported 0x0008000 /* came from environment */
+#define att_special 0x0010000 /* requires special handling */
+#define att_nofree 0x0020000 /* do not free value on unset */
+
+#define attmask_int 0x00ff000
+
+/* Internal attributes used for variable scoping. */
+#define att_tempvar 0x0100000 /* variable came from the temp environment */
+#define att_propagate 0x0200000 /* propagate to previous scope */
+
+#define attmask_scope 0x0f00000
#define exported_p(var) ((((var)->attributes) & (att_exported)))
#define readonly_p(var) ((((var)->attributes) & (att_readonly)))
-#define invisible_p(var) ((((var)->attributes) & (att_invisible)))
#define array_p(var) ((((var)->attributes) & (att_array)))
-#define non_unsettable_p(var) ((((var)->attributes) & (att_nounset)))
#define function_p(var) ((((var)->attributes) & (att_function)))
#define integer_p(var) ((((var)->attributes) & (att_integer)))
-#define imported_p(var) ((((var)->attributes) & (att_imported)))
#define local_p(var) ((((var)->attributes) & (att_local)))
-#define tempvar_p(var) ((((var)->attributes) & (att_tempvar)))
+#define assoc_p(var) ((((var)->attributes) & (att_assoc)))
+#define trace_p(var) ((((var)->attributes) & (att_trace)))
+#define uppercase_p(var) ((((var)->attributes) & (att_uppercase)))
+#define lowercase_p(var) ((((var)->attributes) & (att_lowercase)))
+#define capcase_p(var) ((((var)->attributes) & (att_capcase)))
+#define nameref_p(var) ((((var)->attributes) & (att_nameref)))
+
+#define invisible_p(var) ((((var)->attributes) & (att_invisible)))
+#define non_unsettable_p(var) ((((var)->attributes) & (att_nounset)))
#define noassign_p(var) ((((var)->attributes) & (att_noassign)))
+#define imported_p(var) ((((var)->attributes) & (att_imported)))
+#define specialvar_p(var) ((((var)->attributes) & (att_special)))
+#define nofree_p(var) ((((var)->attributes) & (att_nofree)))
+
+#define tempvar_p(var) ((((var)->attributes) & (att_tempvar)))
+
+/* Acessing variable values: rvalues */
+#define value_cell(var) ((var)->value)
+#define function_cell(var) (COMMAND *)((var)->value)
+#define array_cell(var) (ARRAY *)((var)->value)
+#define assoc_cell(var) (HASH_TABLE *)((var)->value)
+#define nameref_cell(var) ((var)->value) /* so it can change later */
+
+#define NAMEREF_MAX 8 /* only 8 levels of nameref indirection */
+
+#define var_isnull(var) ((var)->value == 0)
+#define var_isset(var) ((var)->value != 0)
+
+/* Assigning variable values: lvalues */
+#define var_setvalue(var, str) ((var)->value = (str))
+#define var_setfunc(var, func) ((var)->value = (char *)(func))
+#define var_setarray(var, arr) ((var)->value = (char *)(arr))
+#define var_setassoc(var, arr) ((var)->value = (char *)(arr))
+#define var_setref(var, str) ((var)->value = (str))
-#define value_cell(var) ((var)->value)
-#define function_cell(var) (COMMAND *)((var)->value)
-#define array_cell(var) ((ARRAY *)(var)->value)
+/* Make VAR be auto-exported. */
+#define set_auto_export(var) \
+ do { (var)->attributes |= att_exported; array_needs_making = 1; } while (0)
#define SETVARATTR(var, attr, undo) \
((undo == 0) ? ((var)->attributes |= (attr)) \
#define SAVE_EXPORTSTR(var, value) (var)->exportstr = (value) ? savestring (value) : (char *)NULL
#define FREE_EXPORTSTR(var) \
- do { \
- if ((var)->exportstr) \
- { \
- if (((var)->attributes & att_importstr) == 0) \
- free ((var)->exportstr); \
- } \
- } while (0)
+ do { if ((var)->exportstr) free ((var)->exportstr); } while (0)
-#if 0
-#define CACHE_IMPORTSTR(var, value) \
- do { \
- (var)->exportstr = value; \
- (var)->attributes |= att_importstr; \
- } while (0)
-#else
#define CACHE_IMPORTSTR(var, value) \
- do { \
- (var)->exportstr = savestring (value); \
- } while (0)
-#endif
+ (var)->exportstr = savestring (value)
#define INVALIDATE_EXPORTSTR(var) \
do { \
if ((var)->exportstr) \
{ \
- if (((var)->attributes & att_importstr) == 0) \
- free ((var)->exportstr); \
+ free ((var)->exportstr); \
(var)->exportstr = (char *)NULL; \
- (var)->attributes &= ~att_importstr; \
} \
} while (0)
/* Stuff for hacking variables. */
typedef int sh_var_map_func_t __P((SHELL_VAR *));
+/* Where we keep the variables and functions */
+extern VAR_CONTEXT *global_variables;
+extern VAR_CONTEXT *shell_variables;
+
+extern HASH_TABLE *shell_functions;
+extern HASH_TABLE *temporary_env;
+
extern int variable_context;
-extern HASH_TABLE *shell_variables, *shell_functions;
extern char *dollar_vars[];
extern char **export_env;
-extern char **non_unsettable_vars;
extern void initialize_shell_variables __P((char **, int));
extern SHELL_VAR *set_if_not __P((char *, char *));
-extern void sh_set_lines_and_columns __P((int, int));
+extern void sh_set_lines_and_columns __P((int, int));
extern void set_pwd __P((void));
-
extern void set_ppid __P((void));
-
extern void make_funcname_visible __P((int));
-extern SHELL_VAR *var_lookup __P((const char *, HASH_TABLE *));
+extern SHELL_VAR *var_lookup __P((const char *, VAR_CONTEXT *));
extern SHELL_VAR *find_function __P((const char *));
+extern FUNCTION_DEF *find_function_def __P((const char *));
extern SHELL_VAR *find_variable __P((const char *));
+extern SHELL_VAR *find_variable_noref __P((const char *));
+extern SHELL_VAR *find_variable_last_nameref __P((const char *));
+extern SHELL_VAR *find_global_variable_last_nameref __P((const char *));
+extern SHELL_VAR *find_variable_nameref __P((SHELL_VAR *));
extern SHELL_VAR *find_variable_internal __P((const char *, int));
+extern SHELL_VAR *find_variable_tempenv __P((const char *));
+extern SHELL_VAR *find_variable_notempenv __P((const char *));
+extern SHELL_VAR *find_global_variable __P((const char *));
+extern SHELL_VAR *find_global_variable_noref __P((const char *));
+extern SHELL_VAR *find_shell_variable __P((const char *));
extern SHELL_VAR *find_tempenv_variable __P((const char *));
extern SHELL_VAR *copy_variable __P((SHELL_VAR *));
extern SHELL_VAR *make_local_variable __P((const char *));
-extern SHELL_VAR *bind_variable __P((const char *, char *));
+extern SHELL_VAR *bind_variable __P((const char *, char *, int));
+extern SHELL_VAR *bind_global_variable __P((const char *, char *, int));
extern SHELL_VAR *bind_function __P((const char *, COMMAND *));
-extern SHELL_VAR **map_over __P((sh_var_map_func_t *, HASH_TABLE *));
+extern void bind_function_def __P((const char *, FUNCTION_DEF *));
+
+extern SHELL_VAR **map_over __P((sh_var_map_func_t *, VAR_CONTEXT *));
+SHELL_VAR **map_over_funcs __P((sh_var_map_func_t *));
+
extern SHELL_VAR **all_shell_variables __P((void));
extern SHELL_VAR **all_shell_functions __P((void));
extern SHELL_VAR **all_visible_variables __P((void));
extern SHELL_VAR **all_visible_functions __P((void));
extern SHELL_VAR **all_exported_variables __P((void));
+extern SHELL_VAR **local_exported_variables __P((void));
+extern SHELL_VAR **all_local_variables __P((void));
#if defined (ARRAY_VARS)
extern SHELL_VAR **all_array_variables __P((void));
#endif
-
extern char **all_variables_matching_prefix __P((const char *));
extern char **make_var_array __P((HASH_TABLE *));
extern char **add_or_supercede_exported_var __P((char *, int));
+extern char *get_variable_value __P((SHELL_VAR *));
extern char *get_string_value __P((const char *));
-extern char *make_variable_value __P((SHELL_VAR *, char *));
+extern char *sh_get_env_value __P((const char *));
+extern char *make_variable_value __P((SHELL_VAR *, char *, int));
-extern SHELL_VAR *bind_variable_value __P((SHELL_VAR *, char *));
+extern SHELL_VAR *bind_variable_value __P((SHELL_VAR *, char *, int));
extern SHELL_VAR *bind_int_variable __P((char *, char *));
-extern SHELL_VAR *bind_var_to_int __P((char *, long));
+extern SHELL_VAR *bind_var_to_int __P((char *, intmax_t));
+
+extern int assign_in_env __P((WORD_DESC *, int));
-extern int assignment __P((const char *));
-extern int variable_in_context __P((SHELL_VAR *));
-extern int assign_in_env __P((const char *));
extern int unbind_variable __P((const char *));
-extern int makunbound __P((const char *, HASH_TABLE *));
+extern int unbind_nameref __P((const char *));
+extern int unbind_func __P((const char *));
+extern int unbind_function_def __P((const char *));
+extern int delete_var __P((const char *, VAR_CONTEXT *));
+extern int makunbound __P((const char *, VAR_CONTEXT *));
extern int kill_local_variable __P((const char *));
extern void delete_all_variables __P((HASH_TABLE *));
+extern void delete_all_contexts __P((VAR_CONTEXT *));
+
+extern VAR_CONTEXT *new_var_context __P((char *, int));
+extern void dispose_var_context __P((VAR_CONTEXT *));
+extern VAR_CONTEXT *push_var_context __P((char *, int, HASH_TABLE *));
+extern void pop_var_context __P((void));
+extern VAR_CONTEXT *push_scope __P((int, HASH_TABLE *));
+extern void pop_scope __P((int));
+
+extern void push_context __P((char *, int, HASH_TABLE *));
+extern void pop_context __P((void));
+extern void push_dollar_vars __P((void));
+extern void pop_dollar_vars __P((void));
+extern void dispose_saved_dollar_vars __P((void));
+
+extern void push_args __P((WORD_LIST *));
+extern void pop_args __P((void));
extern void adjust_shell_level __P((int));
extern void non_unsettable __P((char *));
extern void dispose_builtin_env __P((void));
extern void merge_temporary_env __P((void));
extern void merge_builtin_env __P((void));
-extern void merge_function_env __P((void));
extern void kill_all_local_variables __P((void));
+
extern void set_var_read_only __P((char *));
extern void set_func_read_only __P((const char *));
extern void set_var_auto_export __P((char *));
extern void set_func_auto_export __P((const char *));
+
extern void sort_variables __P((SHELL_VAR **));
+
+extern int chkexport __P((char *));
extern void maybe_make_export_env __P((void));
extern void update_export_env_inplace __P((char *, int, char *));
extern void put_command_name_into_env __P((char *));
-extern void put_gnu_argv_flags_into_env __P((long, char *));
+extern void put_gnu_argv_flags_into_env __P((intmax_t, char *));
+
extern void print_var_list __P((SHELL_VAR **));
extern void print_func_list __P((SHELL_VAR **));
extern void print_assignment __P((SHELL_VAR *));
extern void print_var_value __P((SHELL_VAR *, int));
extern void print_var_function __P((SHELL_VAR *));
-extern char *indirection_level_string __P((void));
-
#if defined (ARRAY_VARS)
extern SHELL_VAR *make_new_array_variable __P((char *));
-extern SHELL_VAR *make_local_array_variable __P((char *));
+extern SHELL_VAR *make_local_array_variable __P((char *, int));
+
+extern SHELL_VAR *make_new_assoc_variable __P((char *));
+extern SHELL_VAR *make_local_assoc_variable __P((char *));
-extern void set_pipestatus_array __P((int *));
+extern void set_pipestatus_array __P((int *, int));
+extern ARRAY *save_pipestatus_array __P((void));
+extern void restore_pipestatus_array __P((ARRAY *));
#endif
extern void set_pipestatus_from_exit __P((int));
is one of the special ones where something special happens. */
extern void stupidly_hack_special_variables __P((char *));
+/* Reinitialize some special variables that have external effects upon unset
+ when the shell reinitializes itself. */
+extern void reinit_special_variables __P((void));
+
extern int get_random_number __P((void));
/* The `special variable' functions that get called when a particular
variable is set. */
+extern void sv_ifs __P((char *));
extern void sv_path __P((char *));
extern void sv_mail __P((char *));
+extern void sv_funcnest __P((char *));
extern void sv_globignore __P((char *));
extern void sv_ignoreeof __P((char *));
extern void sv_strict_posix __P((char *));
extern void sv_optind __P((char *));
extern void sv_opterr __P((char *));
extern void sv_locale __P((char *));
+extern void sv_xtracefd __P((char *));
+extern void sv_shcompat __P((char *));
#if defined (READLINE)
+extern void sv_comp_wordbreaks __P((char *));
extern void sv_terminal __P((char *));
extern void sv_hostfile __P((char *));
+extern void sv_winsize __P((char *));
#endif
-#if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE)
-extern void sv_tz __P((char *));
+#if defined (__CYGWIN__)
+extern void sv_home __P((char *));
#endif
#if defined (HISTORY)
# if defined (BANG_HISTORY)
extern void sv_histchars __P((char *));
# endif
+extern void sv_histtimefmt __P((char *));
#endif /* HISTORY */
+#if defined (HAVE_TZSET)
+extern void sv_tz __P((char *));
+#endif
+
+#if defined (JOB_CONTROL)
+extern void sv_childmax __P((char *));
+#endif
+
#endif /* !_VARIABLES_H_ */
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