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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Table lookup routines |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "lookup.h" |
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#ifdef NOSTRUCTASS |
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#define copystruct(d,s) bcopy((char *)(s),(char *)(d),sizeof(*(d))) |
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#else |
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#define copystruct(d,s) (*(d) = *(s)) |
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#endif |
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#define MEM_PTR char * |
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extern MEM_PTR calloc(); |
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int |
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lu_init(tbl, nel) /* initialize tbl for at least nel elements */ |
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register LUTAB *tbl; |
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int nel; |
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lu_init( /* initialize tbl for at least nel elements */ |
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register LUTAB *tbl, |
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int nel |
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) |
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{ |
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static int hsiztab[] = { |
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31, 61, 127, 251, 509, 1021, 2039, 4093, 8191, 16381, |
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unsigned long |
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lu_shash(s) /* hash a nul-terminated string */ |
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char *s; |
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lu_shash( /* hash a nul-terminated string */ |
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const char *s |
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) |
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{ |
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static unsigned char shuffle[256] = { |
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0, 157, 58, 215, 116, 17, 174, 75, 232, 133, 34, |
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}; |
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register int i = 0; |
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register unsigned long h = 0; |
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register unsigned char *t = (unsigned char *)s; |
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register unsigned const char *t = (unsigned const char *)s; |
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while (*t) |
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h ^= (unsigned long)shuffle[*t++] << ((i+=11) & 0xf); |
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LUENT * |
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lu_find(tbl, key) /* find a table entry */ |
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register LUTAB *tbl; |
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char *key; |
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lu_find( /* find a table entry */ |
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register LUTAB *tbl, |
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const char *key |
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) |
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{ |
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unsigned long hval; |
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int i, n; |
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* recursive call to lu_find(). |
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*/ |
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while (ndx--) |
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if (le[ndx].key != NULL) |
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if (le[ndx].key != NULL) { |
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if (le[ndx].data != NULL) |
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copystruct(lu_find(tbl,le[ndx].key), &le[ndx]); |
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*lu_find(tbl,le[ndx].key) = le[ndx]; |
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else if (tbl->freek != NULL) |
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(*tbl->freek)(le[ndx].key); |
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free((MEM_PTR)le); |
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} |
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free((void *)le); |
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goto tryagain; /* should happen only once! */ |
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} |
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void |
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lu_delete(tbl, key) /* delete a table entry */ |
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register LUTAB *tbl; |
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char *key; |
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lu_delete( /* delete a table entry */ |
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register LUTAB *tbl, |
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const char *key |
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) |
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{ |
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register LUENT *le; |
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int |
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lu_doall(tbl, f) /* loop through all valid table entries */ |
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register LUTAB *tbl; |
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int (*f)(); |
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lu_doall( /* loop through all valid table entries */ |
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register const LUTAB *tbl, |
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/* int (*f)(const LUENT *) */ |
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lut_doallf_t *f, |
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void *p |
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) |
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{ |
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int rval = 0; |
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register LUENT *tp; |
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register const LUENT *tp; |
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for (tp = tbl->tabl + tbl->tsiz; tp-- > tbl->tabl; ) |
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if (tp->data != NULL) |
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if (f != NULL) |
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rval += (*f)(tp); |
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else |
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if (tp->data != NULL) { |
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if (f != NULL) { |
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int r = (*f)(tp, p); |
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if (r < 0) |
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return(-1); |
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rval += r; |
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} else |
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rval++; |
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} |
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return(rval); |
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} |
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void |
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lu_done(tbl) /* free table and contents */ |
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register LUTAB *tbl; |
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lu_done( /* free table and contents */ |
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register LUTAB *tbl |
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) |
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{ |
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register LUENT *tp; |
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if (tp->data != NULL && tbl->freed != NULL) |
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(*tbl->freed)(tp->data); |
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} |
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free((MEM_PTR)tbl->tabl); |
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free((void *)tbl->tabl); |
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tbl->tabl = NULL; |
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tbl->tsiz = 0; |
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tbl->ndel = 0; |
