54 lines
2.3 KiB
C
54 lines
2.3 KiB
C
/* variables.h -- data structures for shell variables. */
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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 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 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 HASH_TABLE *shell_variables, *shell_functions;
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extern SHELL_VAR *find_function (), *find_variable (), *variable_lookup ();
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extern SHELL_VAR *copy_variable (), *bind_variable (), *bind_function ();
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extern char *get_string_value (), *dollar_vars[];
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extern char **export_env;
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extern SHELL_VAR **map_over ();
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extern SHELL_VAR **all_shell_variables (), **all_shell_functions ();
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extern int variable_in_context ();
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extern int variable_context;
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