postgresql/src/bin/psql/variables.h

/* This implements a sort of variable repository. One could also think of it
 * as cheap version of an associative array. In each one of these
 * datastructures you can store name/value pairs.
 *
 * All functions (should) follow the Shit-In-Shit-Out (SISO) principle, i.e.,
 * you can pass them NULL pointers and the like and they will return something
 * appropriate.
 */

#ifndef VARIABLES_H
#define VARIABLES_H
#include <c.h>

#define VALID_VARIABLE_CHARS "abcdefghijklmnopqrstuvwxyz0123456789_"

struct _variable
{
	char	   *name;
	char	   *value;
	struct _variable *next;
};

typedef struct _variable *VariableSpace;


VariableSpace CreateVariableSpace(void);
const char *GetVariable(VariableSpace space, const char *name);
bool		GetVariableBool(VariableSpace space, const char *name);
bool		SetVariable(VariableSpace space, const char *name, const char *value);
bool		DeleteVariable(VariableSpace space, const char *name);
void		DestroyVariableSpace(VariableSpace space);


#endif	 /* VARIABLES_H */