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Diffstat (limited to 'variables.h')
| -rw-r--r-- | variables.h | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/variables.h b/variables.h new file mode 100644 index 0000000..ec1bfdc --- /dev/null +++ b/variables.h @@ -0,0 +1,386 @@ +/* variables.h -- data structures for shell variables. */ + +/* Copyright (C) 1987-2009 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 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. + + 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 (_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 *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. */ + sh_var_value_func_t *dynamic_value; /* Function called to return a `dynamic' + value for a variable, like $SECONDS + or $RANDOM. */ + 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. */ +} 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. */ +/* 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 user_attrs (att_exported|att_readonly|att_integer|att_local|att_trace|att_uppercase|att_lowercase|att_capcase) + +#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 array_p(var) ((((var)->attributes) & (att_array))) +#define function_p(var) ((((var)->attributes) & (att_function))) +#define integer_p(var) ((((var)->attributes) & (att_integer))) +#define local_p(var) ((((var)->attributes) & (att_local))) +#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 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 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)) + +/* 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)) \ + : ((var)->attributes &= ~(attr))) + +#define VSETATTR(var, attr) ((var)->attributes |= (attr)) +#define VUNSETATTR(var, attr) ((var)->attributes &= ~(attr)) + +#define VGETFLAGS(var) ((var)->attributes) + +#define VSETFLAGS(var, flags) ((var)->attributes = (flags)) +#define VCLRFLAGS(var) ((var)->attributes = 0) + +/* Macros to perform various operations on `exportstr' member of a SHELL_VAR. */ +#define CLEAR_EXPORTSTR(var) (var)->exportstr = (char *)NULL +#define COPY_EXPORTSTR(var) ((var)->exportstr) ? savestring ((var)->exportstr) : (char *)NULL +#define SET_EXPORTSTR(var, value) (var)->exportstr = (value) +#define SAVE_EXPORTSTR(var, value) (var)->exportstr = (value) ? savestring (value) : (char *)NULL + +#define FREE_EXPORTSTR(var) \ + do { if ((var)->exportstr) free ((var)->exportstr); } while (0) + +#define CACHE_IMPORTSTR(var, value) \ + (var)->exportstr = savestring (value) + +#define INVALIDATE_EXPORTSTR(var) \ + do { \ + if ((var)->exportstr) \ + { \ + free ((var)->exportstr); \ + (var)->exportstr = (char *)NULL; \ + } \ + } 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 char *dollar_vars[]; +extern char **export_env; + +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 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 *, 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_internal __P((const char *, int)); +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 *, int)); +extern SHELL_VAR *bind_function __P((const char *, COMMAND *)); + +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 *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 *, int)); +extern SHELL_VAR *bind_int_variable __P((char *, char *)); +extern SHELL_VAR *bind_var_to_int __P((char *, intmax_t)); + +extern int assign_in_env __P((WORD_DESC *)); + +extern int unbind_variable __P((const char *)); +extern int unbind_func __P((const char *)); +extern int unbind_function_def __P((const char *)); +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_variable __P((SHELL_VAR *)); +extern void dispose_used_env_vars __P((void)); +extern void dispose_function_env __P((void)); +extern void dispose_builtin_env __P((void)); +extern void merge_temporary_env __P((void)); +extern void merge_builtin_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 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((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 *)); + +#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_new_assoc_variable __P((char *)); +extern SHELL_VAR *make_local_assoc_variable __P((char *)); + +extern void set_pipestatus_array __P((int *, int)); +#endif + +extern void set_pipestatus_from_exit __P((int)); + +/* The variable in NAME has just had its state changed. Check to see if it + 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_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 *)); + +#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 (__CYGWIN__) +extern void sv_home __P((char *)); +#endif + +#if defined (HISTORY) +extern void sv_histsize __P((char *)); +extern void sv_histignore __P((char *)); +extern void sv_history_control __P((char *)); +# if defined (BANG_HISTORY) +extern void sv_histchars __P((char *)); +# endif +extern void sv_histtimefmt __P((char *)); +#endif /* HISTORY */ + +#if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE) +extern void sv_tz __P((char *)); +#endif + +#endif /* !_VARIABLES_H_ */ |