| 1 | /* variables.h -- data structures for shell variables. */
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| 2 |
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| 3 | /* Copyright (C) 1987-2005 Free Software Foundation, Inc.
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| 4 |
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| 5 | This file is part of GNU Bash, the Bourne Again SHell.
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| 6 |
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| 7 | Bash is free software; you can redistribute it and/or modify it
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| 8 | under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2, or (at your option)
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| 10 | any later version.
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| 11 |
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| 12 | Bash is distributed in the hope that it will be useful, but WITHOUT
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| 13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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| 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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| 15 | License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with Bash; see the file COPYING. If not, write to the Free
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| 19 | Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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| 20 |
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| 21 | #if !defined (_VARIABLES_H_)
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| 22 | #define _VARIABLES_H_
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| 23 |
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| 24 | #include "stdc.h"
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| 25 | #include "array.h"
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| 26 |
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| 27 | /* Shell variables and functions are stored in hash tables. */
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| 28 | #include "hashlib.h"
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| 29 |
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| 30 | #include "conftypes.h"
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| 31 |
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| 32 | /* A variable context. */
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| 33 | typedef struct var_context {
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| 34 | char *name; /* empty or NULL means global context */
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| 35 | int scope; /* 0 means global context */
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| 36 | int flags;
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| 37 | struct var_context *up; /* previous function calls */
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| 38 | struct var_context *down; /* down towards global context */
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| 39 | HASH_TABLE *table; /* variables at this scope */
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| 40 | } VAR_CONTEXT;
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| 41 |
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| 42 | /* Flags for var_context->flags */
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| 43 | #define VC_HASLOCAL 0x01
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| 44 | #define VC_HASTMPVAR 0x02
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| 45 | #define VC_FUNCENV 0x04 /* also function if name != NULL */
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| 46 | #define VC_BLTNENV 0x08 /* builtin_env */
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| 47 | #define VC_TEMPENV 0x10 /* temporary_env */
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| 48 |
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| 49 | #define VC_TEMPFLAGS (VC_FUNCENV|VC_BLTNENV|VC_TEMPENV)
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| 50 |
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| 51 | /* Accessing macros */
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| 52 | #define vc_isfuncenv(vc) (((vc)->flags & VC_FUNCENV) != 0)
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| 53 | #define vc_isbltnenv(vc) (((vc)->flags & VC_BLTNENV) != 0)
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| 54 | #define vc_istempenv(vc) (((vc)->flags & (VC_TEMPFLAGS)) == VC_TEMPENV)
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| 55 |
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| 56 | #define vc_istempscope(vc) (((vc)->flags & (VC_TEMPENV|VC_BLTNENV)) != 0)
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| 57 |
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| 58 | #define vc_haslocals(vc) (((vc)->flags & VC_HASLOCAL) != 0)
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| 59 | #define vc_hastmpvars(vc) (((vc)->flags & VC_HASTMPVAR) != 0)
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| 60 |
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| 61 | /* What a shell variable looks like. */
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| 62 |
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| 63 | typedef struct variable *sh_var_value_func_t __P((struct variable *));
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| 64 | typedef struct variable *sh_var_assign_func_t __P((struct variable *, char *, arrayind_t));
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| 65 |
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| 66 | /* For the future */
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| 67 | union _value {
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| 68 | char *s; /* string value */
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| 69 | intmax_t i; /* int value */
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| 70 | COMMAND *f; /* function */
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| 71 | ARRAY *a; /* array */
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| 72 | HASH_TABLE *h; /* associative array */
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| 73 | double d; /* floating point number */
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| 74 | #if defined (HAVE_LONG_DOUBLE)
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| 75 | long double ld; /* long double */
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| 76 | #endif
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| 77 | struct variable *v; /* possible indirect variable use */
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| 78 | void *opaque; /* opaque data for future use */
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| 79 | };
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| 80 |
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| 81 | typedef struct variable {
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| 82 | char *name; /* Symbol that the user types. */
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| 83 | char *value; /* Value that is returned. */
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| 84 | char *exportstr; /* String for the environment. */
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| 85 | sh_var_value_func_t *dynamic_value; /* Function called to return a `dynamic'
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| 86 | value for a variable, like $SECONDS
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| 87 | or $RANDOM. */
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| 88 | sh_var_assign_func_t *assign_func; /* Function called when this `special
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| 89 | variable' is assigned a value in
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| 90 | bind_variable. */
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| 91 | int attributes; /* export, readonly, array, invisible... */
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| 92 | int context; /* Which context this variable belongs to. */
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| 93 | } SHELL_VAR;
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| 94 |
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| 95 | typedef struct _vlist {
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| 96 | SHELL_VAR **list;
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| 97 | int list_size; /* allocated size */
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| 98 | int list_len; /* current number of entries */
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| 99 | } VARLIST;
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| 100 |
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| 101 | /* The various attributes that a given variable can have. */
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| 102 | /* First, the user-visible attributes */
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| 103 | #define att_exported 0x0000001 /* export to environment */
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| 104 | #define att_readonly 0x0000002 /* cannot change */
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| 105 | #define att_array 0x0000004 /* value is an array */
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| 106 | #define att_function 0x0000008 /* value is a function */
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| 107 | #define att_integer 0x0000010 /* internal representation is int */
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| 108 | #define att_local 0x0000020 /* variable is local to a function */
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| 109 | #define att_assoc 0x0000040 /* variable is an associative array */
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| 110 | #define att_trace 0x0000080 /* function is traced with DEBUG trap */
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| 111 |
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| 112 | #define attmask_user 0x0000fff
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| 113 |
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| 114 | /* Internal attributes used for bookkeeping */
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| 115 | #define att_invisible 0x0001000 /* cannot see */
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| 116 | #define att_nounset 0x0002000 /* cannot unset */
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| 117 | #define att_noassign 0x0004000 /* assignment not allowed */
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| 118 | #define att_imported 0x0008000 /* came from environment */
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| 119 | #define att_special 0x0010000 /* requires special handling */
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| 120 |
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| 121 | #define attmask_int 0x00ff000
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| 122 |
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| 123 | /* Internal attributes used for variable scoping. */
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| 124 | #define att_tempvar 0x0100000 /* variable came from the temp environment */
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| 125 | #define att_propagate 0x0200000 /* propagate to previous scope */
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| 126 |
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| 127 | #define attmask_scope 0x0f00000
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| 128 |
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| 129 | #define exported_p(var) ((((var)->attributes) & (att_exported)))
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| 130 | #define readonly_p(var) ((((var)->attributes) & (att_readonly)))
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| 131 | #define array_p(var) ((((var)->attributes) & (att_array)))
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| 132 | #define function_p(var) ((((var)->attributes) & (att_function)))
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| 133 | #define integer_p(var) ((((var)->attributes) & (att_integer)))
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| 134 | #define local_p(var) ((((var)->attributes) & (att_local)))
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| 135 | #define assoc_p(var) ((((var)->attributes) & (att_assoc)))
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| 136 | #define trace_p(var) ((((var)->attributes) & (att_trace)))
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| 137 |
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| 138 | #define invisible_p(var) ((((var)->attributes) & (att_invisible)))
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| 139 | #define non_unsettable_p(var) ((((var)->attributes) & (att_nounset)))
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| 140 | #define noassign_p(var) ((((var)->attributes) & (att_noassign)))
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| 141 | #define imported_p(var) ((((var)->attributes) & (att_imported)))
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| 142 | #define specialvar_p(var) ((((var)->attributes) & (att_special)))
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| 143 |
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| 144 | #define tempvar_p(var) ((((var)->attributes) & (att_tempvar)))
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| 145 |
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| 146 | /* Acessing variable values: rvalues */
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| 147 | #define value_cell(var) ((var)->value)
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| 148 | #define function_cell(var) (COMMAND *)((var)->value)
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| 149 | #define array_cell(var) (ARRAY *)((var)->value)
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| 150 |
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| 151 | #define var_isnull(var) ((var)->value == 0)
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| 152 | #define var_isset(var) ((var)->value != 0)
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| 153 |
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| 154 | /* Assigning variable values: lvalues */
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| 155 | #define var_setvalue(var, str) ((var)->value = (str))
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| 156 | #define var_setfunc(var, func) ((var)->value = (char *)(func))
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| 157 | #define var_setarray(var, arr) ((var)->value = (char *)(arr))
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| 158 |
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| 159 | /* Make VAR be auto-exported. */
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| 160 | #define set_auto_export(var) \
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| 161 | do { (var)->attributes |= att_exported; array_needs_making = 1; } while (0)
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| 162 |
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| 163 | #define SETVARATTR(var, attr, undo) \
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| 164 | ((undo == 0) ? ((var)->attributes |= (attr)) \
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| 165 | : ((var)->attributes &= ~(attr)))
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| 166 |
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| 167 | #define VSETATTR(var, attr) ((var)->attributes |= (attr))
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| 168 | #define VUNSETATTR(var, attr) ((var)->attributes &= ~(attr))
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| 169 |
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| 170 | #define VGETFLAGS(var) ((var)->attributes)
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| 171 |
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| 172 | #define VSETFLAGS(var, flags) ((var)->attributes = (flags))
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| 173 | #define VCLRFLAGS(var) ((var)->attributes = 0)
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| 174 |
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| 175 | /* Macros to perform various operations on `exportstr' member of a SHELL_VAR. */
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| 176 | #define CLEAR_EXPORTSTR(var) (var)->exportstr = (char *)NULL
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| 177 | #define COPY_EXPORTSTR(var) ((var)->exportstr) ? savestring ((var)->exportstr) : (char *)NULL
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| 178 | #define SET_EXPORTSTR(var, value) (var)->exportstr = (value)
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| 179 | #define SAVE_EXPORTSTR(var, value) (var)->exportstr = (value) ? savestring (value) : (char *)NULL
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| 180 |
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| 181 | #define FREE_EXPORTSTR(var) \
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| 182 | do { if ((var)->exportstr) free ((var)->exportstr); } while (0)
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| 183 |
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| 184 | #define CACHE_IMPORTSTR(var, value) \
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| 185 | (var)->exportstr = savestring (value)
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| 186 |
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| 187 | #define INVALIDATE_EXPORTSTR(var) \
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| 188 | do { \
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| 189 | if ((var)->exportstr) \
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| 190 | { \
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| 191 | free ((var)->exportstr); \
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| 192 | (var)->exportstr = (char *)NULL; \
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| 193 | } \
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| 194 | } while (0)
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| 195 |
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| 196 | /* Stuff for hacking variables. */
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| 197 | typedef int sh_var_map_func_t __P((SHELL_VAR *));
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| 198 |
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| 199 | /* Where we keep the variables and functions */
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| 200 | extern VAR_CONTEXT *global_variables;
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| 201 | extern VAR_CONTEXT *shell_variables;
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| 202 |
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| 203 | extern HASH_TABLE *shell_functions;
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| 204 | extern HASH_TABLE *temporary_env;
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| 205 |
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| 206 | extern int variable_context;
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| 207 | extern char *dollar_vars[];
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| 208 | extern char **export_env;
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| 209 |
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| 210 | extern void initialize_shell_variables __P((char **, int));
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| 211 | extern SHELL_VAR *set_if_not __P((char *, char *));
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| 212 |
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| 213 | extern void sh_set_lines_and_columns __P((int, int));
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| 214 | extern void set_pwd __P((void));
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| 215 | extern void set_ppid __P((void));
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| 216 | extern void make_funcname_visible __P((int));
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| 217 |
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| 218 | extern SHELL_VAR *var_lookup __P((const char *, VAR_CONTEXT *));
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| 219 |
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| 220 | extern SHELL_VAR *find_function __P((const char *));
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| 221 | extern FUNCTION_DEF *find_function_def __P((const char *));
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| 222 | extern SHELL_VAR *find_variable __P((const char *));
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| 223 | extern SHELL_VAR *find_variable_internal __P((const char *, int));
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| 224 | extern SHELL_VAR *find_tempenv_variable __P((const char *));
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| 225 | extern SHELL_VAR *copy_variable __P((SHELL_VAR *));
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| 226 | extern SHELL_VAR *make_local_variable __P((const char *));
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| 227 | extern SHELL_VAR *bind_variable __P((const char *, char *, int));
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| 228 | extern SHELL_VAR *bind_function __P((const char *, COMMAND *));
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| 229 |
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| 230 | extern void bind_function_def __P((const char *, FUNCTION_DEF *));
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| 231 |
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| 232 | extern SHELL_VAR **map_over __P((sh_var_map_func_t *, VAR_CONTEXT *));
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| 233 | SHELL_VAR **map_over_funcs __P((sh_var_map_func_t *));
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| 234 |
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| 235 | extern SHELL_VAR **all_shell_variables __P((void));
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| 236 | extern SHELL_VAR **all_shell_functions __P((void));
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| 237 | extern SHELL_VAR **all_visible_variables __P((void));
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| 238 | extern SHELL_VAR **all_visible_functions __P((void));
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| 239 | extern SHELL_VAR **all_exported_variables __P((void));
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| 240 | extern SHELL_VAR **local_exported_variables __P((void));
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| 241 | extern SHELL_VAR **all_local_variables __P((void));
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| 242 | #if defined (ARRAY_VARS)
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| 243 | extern SHELL_VAR **all_array_variables __P((void));
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| 244 | #endif
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| 245 | extern char **all_variables_matching_prefix __P((const char *));
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| 246 |
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| 247 | extern char **make_var_array __P((HASH_TABLE *));
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| 248 | extern char **add_or_supercede_exported_var __P((char *, int));
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| 249 |
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| 250 | extern char *get_variable_value __P((SHELL_VAR *));
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| 251 | extern char *get_string_value __P((const char *));
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| 252 | extern char *sh_get_env_value __P((const char *));
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| 253 | extern char *make_variable_value __P((SHELL_VAR *, char *, int));
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| 254 |
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| 255 | extern SHELL_VAR *bind_variable_value __P((SHELL_VAR *, char *, int));
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| 256 | extern SHELL_VAR *bind_int_variable __P((char *, char *));
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| 257 | extern SHELL_VAR *bind_var_to_int __P((char *, intmax_t));
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| 258 |
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| 259 | extern int assign_in_env __P((WORD_DESC *));
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| 260 |
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| 261 | extern int unbind_variable __P((const char *));
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| 262 | extern int unbind_func __P((const char *));
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| 263 | extern int unbind_function_def __P((const char *));
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| 264 | extern int makunbound __P((const char *, VAR_CONTEXT *));
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| 265 | extern int kill_local_variable __P((const char *));
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| 266 | extern void delete_all_variables __P((HASH_TABLE *));
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| 267 | extern void delete_all_contexts __P((VAR_CONTEXT *));
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| 268 |
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| 269 | extern VAR_CONTEXT *new_var_context __P((char *, int));
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| 270 | extern void dispose_var_context __P((VAR_CONTEXT *));
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| 271 | extern VAR_CONTEXT *push_var_context __P((char *, int, HASH_TABLE *));
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| 272 | extern void pop_var_context __P((void));
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| 273 | extern VAR_CONTEXT *push_scope __P((int, HASH_TABLE *));
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| 274 | extern void pop_scope __P((int));
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| 275 |
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| 276 | extern void push_context __P((char *, int, HASH_TABLE *));
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| 277 | extern void pop_context __P((void));
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| 278 | extern void push_dollar_vars __P((void));
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| 279 | extern void pop_dollar_vars __P((void));
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| 280 | extern void dispose_saved_dollar_vars __P((void));
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| 281 |
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| 282 | extern void push_args __P((WORD_LIST *));
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| 283 | extern void pop_args __P((void));
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| 284 |
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| 285 | extern void adjust_shell_level __P((int));
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| 286 | extern void non_unsettable __P((char *));
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| 287 | extern void dispose_variable __P((SHELL_VAR *));
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| 288 | extern void dispose_used_env_vars __P((void));
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| 289 | extern void dispose_function_env __P((void));
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| 290 | extern void dispose_builtin_env __P((void));
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| 291 | extern void merge_temporary_env __P((void));
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| 292 | extern void merge_builtin_env __P((void));
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| 293 | extern void kill_all_local_variables __P((void));
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| 294 |
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| 295 | extern void set_var_read_only __P((char *));
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| 296 | extern void set_func_read_only __P((const char *));
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| 297 | extern void set_var_auto_export __P((char *));
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| 298 | extern void set_func_auto_export __P((const char *));
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| 299 |
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| 300 | extern void sort_variables __P((SHELL_VAR **));
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| 301 |
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| 302 | extern void maybe_make_export_env __P((void));
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| 303 | extern void update_export_env_inplace __P((char *, int, char *));
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| 304 | extern void put_command_name_into_env __P((char *));
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| 305 | extern void put_gnu_argv_flags_into_env __P((intmax_t, char *));
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| 306 |
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| 307 | extern void print_var_list __P((SHELL_VAR **));
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| 308 | extern void print_func_list __P((SHELL_VAR **));
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| 309 | extern void print_assignment __P((SHELL_VAR *));
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| 310 | extern void print_var_value __P((SHELL_VAR *, int));
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| 311 | extern void print_var_function __P((SHELL_VAR *));
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| 312 |
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| 313 | #if defined (ARRAY_VARS)
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| 314 | extern SHELL_VAR *make_new_array_variable __P((char *));
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| 315 | extern SHELL_VAR *make_local_array_variable __P((char *));
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| 316 |
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| 317 | extern void set_pipestatus_array __P((int *, int));
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| 318 | #endif
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| 319 |
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| 320 | extern void set_pipestatus_from_exit __P((int));
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| 321 |
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| 322 | /* The variable in NAME has just had its state changed. Check to see if it
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| 323 | is one of the special ones where something special happens. */
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| 324 | extern void stupidly_hack_special_variables __P((char *));
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| 325 |
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| 326 | extern int get_random_number __P((void));
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| 327 |
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| 328 | /* The `special variable' functions that get called when a particular
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| 329 | variable is set. */
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| 330 | extern void sv_ifs __P((char *));
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| 331 | extern void sv_path __P((char *));
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| 332 | extern void sv_mail __P((char *));
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| 333 | extern void sv_comp_wordbreaks __P((char *));
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| 334 | extern void sv_globignore __P((char *));
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| 335 | extern void sv_ignoreeof __P((char *));
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| 336 | extern void sv_strict_posix __P((char *));
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| 337 | extern void sv_optind __P((char *));
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| 338 | extern void sv_opterr __P((char *));
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| 339 | extern void sv_locale __P((char *));
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| 340 |
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| 341 | #if defined (READLINE)
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| 342 | extern void sv_comp_wordbreaks __P((char *));
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| 343 | extern void sv_terminal __P((char *));
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| 344 | extern void sv_hostfile __P((char *));
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| 345 | extern void sv_winsize __P((char *));
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| 346 | #endif
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| 347 |
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| 348 | #if defined (__CYGWIN__)
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| 349 | extern void sv_home __P((char *));
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| 350 | #endif
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| 351 |
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| 352 | #if defined (HISTORY)
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| 353 | extern void sv_histsize __P((char *));
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| 354 | extern void sv_histignore __P((char *));
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| 355 | extern void sv_history_control __P((char *));
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| 356 | # if defined (BANG_HISTORY)
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| 357 | extern void sv_histchars __P((char *));
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| 358 | # endif
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| 359 | extern void sv_histtimefmt __P((char *));
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| 360 | #endif /* HISTORY */
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| 361 |
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| 362 | #if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE)
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| 363 | extern void sv_tz __P((char *));
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| 364 | #endif
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| 365 |
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| 366 | #endif /* !_VARIABLES_H_ */
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