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2 * Copyright (c) 1998-2003,2005 Free Software Foundation, Inc. *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
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9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
31 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
32 * and: Thomas E. Dickey 1996-on *
33 ****************************************************************************/
36 * comp_hash.c --- Routines to deal with the hashtable of capability
42 #include <curses.priv.h>
50 #define DEBUG(level, params) /*nothing */
53 MODULE_ID("$Id: comp_hash.c,v 1.28 2005/08/20 19:58:18 tom Exp $")
55 static int hash_function(const char *);
58 * _nc_make_hash_table()
60 * Takes the entries in table[] and hashes them into hash_table[]
61 * by name. There are CAPTABSIZE entries in table[] and HASHTABSIZE
62 * slots in hash_table[].
69 #define MODULE_ID(id) /*nothing */
70 #include <tinfo/doalloc.c>
73 _nc_make_hash_table(struct name_table_entry *table,
74 struct name_table_entry **hash_table)
80 for (i = 0; i < CAPTABSIZE; i++) {
81 hashvalue = hash_function(table[i].nte_name);
83 if (hash_table[hashvalue] != (struct name_table_entry *) 0)
86 if (hash_table[hashvalue] != 0)
87 table[i].nte_link = (short) (hash_table[hashvalue] - table);
88 hash_table[hashvalue] = &table[i];
91 DEBUG(4, ("Hash table complete: %d collisions out of %d entries",
92 collisions, CAPTABSIZE));
97 * int hash_function(string)
99 * Computes the hashing function on the given string.
101 * The current hash function is the sum of each consectutive pair
102 * of characters, taken as two-byte integers, mod HASHTABSIZE.
107 hash_function(const char *string)
111 DEBUG(9, ("hashing %s", string));
113 sum += (long) (*string + (*(string + 1) << 8));
117 DEBUG(9, ("sum is %ld", sum));
118 return (int) (sum % HASHTABSIZE);
122 * struct name_table_entry *
125 * Finds the entry for the given string in the hash table if present.
126 * Returns a pointer to the entry in the table or 0 if not found.
131 NCURSES_EXPORT(struct name_table_entry const *)
132 _nc_find_entry(const char *string,
133 const struct name_table_entry *const *hash_table)
136 struct name_table_entry const *ptr;
138 hashvalue = hash_function(string);
140 if ((ptr = hash_table[hashvalue]) != 0) {
141 while (strcmp(ptr->nte_name, string) != 0) {
142 if (ptr->nte_link < 0)
144 ptr = ptr->nte_link + hash_table[HASHTABSIZE];
152 * struct name_table_entry *
153 * find_type_entry(string, type, table)
155 * Finds the first entry for the given name with the given type in the
156 * given table if present (as distinct from find_entry, which finds the
157 * the last entry regardless of type). You can use this if you detect
158 * a name clash. It's slower, though. Returns a pointer to the entry
159 * in the table or 0 if not found.
162 NCURSES_EXPORT(struct name_table_entry const *)
163 _nc_find_type_entry(const char *string,
165 const struct name_table_entry *table)
167 struct name_table_entry const *ptr;
169 for (ptr = table; ptr < table + CAPTABSIZE; ptr++) {
170 if (ptr->nte_type == type && strcmp(string, ptr->nte_name) == 0)
174 return ((struct name_table_entry *) NULL);
180 * This filter reads from standard input a list of tab-delimited columns,
181 * (e.g., from Caps.filtered) computes the hash-value of a specified column and
182 * writes the hashed tables to standard output.
184 * By compiling the hash table at build time, we're able to make the entire
185 * set of terminfo and termcap tables readonly (and also provide some runtime
186 * performance enhancement).
189 #define MAX_COLUMNS BUFSIZ /* this _has_ to be worst-case */
192 parse_columns(char *buffer)
198 if (list == 0 && (list = typeCalloc(char *, MAX_COLUMNS)) == 0)
201 if (*buffer != '#') {
202 while (*buffer != '\0') {
204 for (s = buffer; (*s != '\0') && !isspace(UChar(*s)); s++)
211 && (s[-1] == '"')) { /* strip the quotes */
219 while (*++s && isspace(UChar(*s)))
226 return col ? list : 0;
230 main(int argc, char **argv)
232 struct name_table_entry *name_table = typeCalloc(struct
233 name_table_entry, CAPTABSIZE);
234 struct name_table_entry **hash_table = typeCalloc(struct name_table_entry
236 const char *root_name = "";
241 static const char *typenames[] =
242 {"BOOLEAN", "NUMBER", "STRING"};
248 /* The first argument is the column-number (starting with 0).
249 * The second is the root name of the tables to generate.
252 || (column = atoi(argv[1])) <= 0
253 || (column >= MAX_COLUMNS)
254 || *(root_name = argv[2]) == 0) {
255 fprintf(stderr, "usage: make_hash column root_name\n");
260 * Read the table into our arrays.
262 for (n = 0; (n < CAPTABSIZE) && fgets(buffer, BUFSIZ, stdin);) {
263 char **list, *nlp = strchr(buffer, '\n');
266 list = parse_columns(buffer);
267 if (list == 0) /* blank or comment */
269 name_table[n].nte_link = -1; /* end-of-hash */
270 name_table[n].nte_name = strdup(list[column]);
271 if (!strcmp(list[2], "bool")) {
272 name_table[n].nte_type = BOOLEAN;
273 name_table[n].nte_index = BoolCount++;
274 } else if (!strcmp(list[2], "num")) {
275 name_table[n].nte_type = NUMBER;
276 name_table[n].nte_index = NumCount++;
277 } else if (!strcmp(list[2], "str")) {
278 name_table[n].nte_type = STRING;
279 name_table[n].nte_index = StrCount++;
281 fprintf(stderr, "Unknown type: %s\n", list[2]);
286 _nc_make_hash_table(name_table, hash_table);
289 * Write the compiled tables to standard output
291 printf("static struct name_table_entry const _nc_%s_table[] =\n",
294 for (n = 0; n < CAPTABSIZE; n++) {
295 sprintf(buffer, "\"%s\"",
296 name_table[n].nte_name);
297 printf("\t{ %15s,\t%10s,\t%3d, %3d }%c\n",
299 typenames[name_table[n].nte_type],
300 name_table[n].nte_index,
301 name_table[n].nte_link,
302 n < CAPTABSIZE - 1 ? ',' : ' ');
306 printf("const struct name_table_entry * const _nc_%s_hash_table[%d] =\n",
310 for (n = 0; n < HASHTABSIZE; n++) {
311 if (hash_table[n] != 0) {
312 sprintf(buffer, "_nc_%s_table + %3ld",
314 (long) (hash_table[n] - name_table));
318 printf("\t%s,\n", buffer);
320 printf("\t_nc_%s_table\t/* base-of-table */\n", root_name);
323 printf("#if (BOOLCOUNT!=%d)||(NUMCOUNT!=%d)||(STRCOUNT!=%d)\n",
324 BoolCount, NumCount, StrCount);
325 printf("#error\t--> term.h and comp_captab.c disagree about the <--\n");
326 printf("#error\t--> numbers of booleans, numbers and/or strings <--\n");
327 printf("#endif\n\n");