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/*
* psql - the PostgreSQL interactive terminal
*
* Copyright (c) 2000-2010, PostgreSQL Global Development Group
*
* src/bin/psql/variables.h
*/
#ifndef VARIABLES_H
#define VARIABLES_H
/*
* This implements a sort of variable repository. One could also think of it
* as a cheap version of an associative array. In each one of these
* datastructures you can store name/value pairs. There can also be an
* "assign hook" function that is called whenever the variable's value is
* changed.
*
* An "unset" operation causes the hook to be called with newval == NULL.
*
* Note: if value == NULL then the variable is logically unset, but we are
* keeping the struct around so as not to forget about its hook function.
*/
typedef void (*VariableAssignHook) (const char *newval);
struct _variable
{
char *name;
char *value;
VariableAssignHook assign_hook;
struct _variable *next;
};
typedef struct _variable *VariableSpace;
/* Allowed chars in a variable's name */
#define VALID_VARIABLE_CHARS "abcdefghijklmnopqrstuvwxyz"\
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" "0123456789_"
VariableSpace CreateVariableSpace(void);
const char *GetVariable(VariableSpace space, const char *name);
bool ParseVariableBool(const char *val);
int ParseVariableNum(const char *val,
int defaultval,
int faultval,
bool allowtrail);
int GetVariableNum(VariableSpace space,
const char *name,
int defaultval,
int faultval,
bool allowtrail);
void PrintVariables(VariableSpace space);
bool SetVariable(VariableSpace space, const char *name, const char *value);
bool SetVariableAssignHook(VariableSpace space, const char *name, VariableAssignHook hook);
bool SetVariableBool(VariableSpace space, const char *name);
bool DeleteVariable(VariableSpace space, const char *name);
#endif /* VARIABLES_H */
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