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greg |
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/* Copyright (c) 1994 Regents of the University of California */
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/* SCCSid "$SunId$ LBL" */
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/*
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* Header file for table lookup routines
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*/
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typedef struct {
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char *key; /* key name (dynamically allocated) */
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char *data; /* pointer to client data */
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} LUENT;
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typedef struct {
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int tsiz; /* current table size */
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LUENT *tabl; /* table, if allocated */
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} LUTAB;
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/*
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* The lu_init routine is called to initialize a table. The number of
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* elements passed is not a limiting factor, as a table can grow to
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* any size permitted by memory. However, access will be more efficient
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* if this number strikes a reasonable balance between default memory use
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* and the expected (minimum) table size. The value returned is the
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* actual allocated table size (or zero if there was insufficient memory).
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*
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* It isn't fully necessary to initialize the LUTAB structure. If it
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* is cleared (tsiz = 0, tabl = NULL), then the first call to lu_find
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* will allocate a minimal table.
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*
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* The lu_find routine returns the entry corresponding to the given
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* key (any nul-terminated string). If the entry does not exist, the
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* corresponding key field will be NULL. It is the caller's responsibility
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* to (allocate and) assign the key field when creating a new entry.
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* If an entry exists, the corresponding data field indicates whether
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* or not it contains data, and this, too, is subject to user control
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* and interpretation. The only case where lu_find returns NULL is
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* when the system has run out of memory.
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*
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* The lu_done routine calls the given free function once for each
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* assigned table entry (i.e. each entry with an assigned key value).
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* The user must define this routine to free the key and the data
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* as appropriate. The final action of lu_done is to free the
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* allocated table itself.
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*/
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#ifdef NOPROTO
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extern int lu_init();
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extern LUENT *lu_find();
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extern void lu_done();
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#else
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extern int lu_init(LUTAB *, int);
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extern LUENT *lu_find(LUTAB *, char *);
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extern void lu_done(LUTAB *, void (*)(LUENT *));
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#endif
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