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61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
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* psql - the PostgreSQL interactive terminal
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*
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* Copyright (c) 2000-2011, PostgreSQL Global Development Group
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*
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* src/bin/psql/variables.h
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*/
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#ifndef VARIABLES_H
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#define VARIABLES_H
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/*
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* This implements a sort of variable repository. One could also think of it
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* as a cheap version of an associative array. In each one of these
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* datastructures you can store name/value pairs. There can also be an
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* "assign hook" function that is called whenever the variable's value is
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* changed.
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*
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* An "unset" operation causes the hook to be called with newval == NULL.
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*
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* Note: if value == NULL then the variable is logically unset, but we are
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* keeping the struct around so as not to forget about its hook function.
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*/
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typedef void (*VariableAssignHook) (const char *newval);
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struct _variable
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{
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char *name;
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char *value;
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VariableAssignHook assign_hook;
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struct _variable *next;
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};
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typedef struct _variable *VariableSpace;
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/* Allowed chars in a variable's name */
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#define VALID_VARIABLE_CHARS "abcdefghijklmnopqrstuvwxyz"\
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" "0123456789_"
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VariableSpace CreateVariableSpace(void);
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const char *GetVariable(VariableSpace space, const char *name);
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bool ParseVariableBool(const char *val);
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int ParseVariableNum(const char *val,
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int defaultval,
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int faultval,
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bool allowtrail);
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int GetVariableNum(VariableSpace space,
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const char *name,
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int defaultval,
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int faultval,
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bool allowtrail);
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void PrintVariables(VariableSpace space);
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bool SetVariable(VariableSpace space, const char *name, const char *value);
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bool SetVariableAssignHook(VariableSpace space, const char *name, VariableAssignHook hook);
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bool SetVariableBool(VariableSpace space, const char *name);
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bool DeleteVariable(VariableSpace space, const char *name);
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#endif /* VARIABLES_H */
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