?? table.c
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#ifndef lintstatic char sccsid[] = "@(#)table.c 1.1 92/07/30 (C) 1985 Sun Microsystems, Inc.";#endif#include <ctype.h>#include "util.h"#include "table.h"/* * Hash table manager. Store/lookup strings, keyed by string *//* * Generate the key into the table using the first two letters * of "str". The table is alphabetized, with no distinction between * upper and lower case. Non-letters are given least significance. */inttablekey(str) register char *str;{# define TOLOWER(c) (islower(c) ? c : \ (isupper(c) ? tolower(c) : ('a'+NUMLETTERS-1))) register int c1,c2; c1 = *str++; c2 = *str; if (c1 == EOS) { c2 = EOS; /* just in case */ } c1 = TOLOWER(c1) - 'a'; c2 = TOLOWER(c2) - 'a'; return (c1*NUMLETTERS + c2);}voidstore(table,key,datum) stringtable table; char *key; char *datum;{ int index; tablelist cur,new; index = tablekey(key); cur = table[index]; new = MALLOC(tablenode); new->key = key; new->datum = datum; new->next = cur; table[index] = new;} char *lookup(table,key) stringtable table; char *key;{ tablelist cur; cur = table[tablekey(key)]; while (cur && strcmp(cur->key,key)) { cur = cur->next; } if (cur) { return(cur->datum); } else { return(NULL); }}
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