1 /****************************************************************************
2 * Copyright (c) 1998-2011,2012 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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8 * distribute, distribute with modifications, sublicense, and/or sell *
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 * make_hash.c --- build-time program for constructing comp_captab.c
40 #include <build.priv.h>
47 MODULE_ID("$Id: make_hash.c,v 1.10 2012/12/16 00:40:14 tom Exp $")
50 * _nc_make_hash_table()
52 * Takes the entries in table[] and hashes them into hash_table[]
53 * by name. There are CAPTABSIZE entries in table[] and HASHTABSIZE
54 * slots in hash_table[].
59 #define MODULE_ID(id) /*nothing */
60 #include <tinfo/doalloc.c>
63 * int hash_function(string)
65 * Computes the hashing function on the given string.
67 * The current hash function is the sum of each consectutive pair
68 * of characters, taken as two-byte integers, mod HASHTABSIZE.
73 hash_function(const char *string)
78 sum += (long) (*string + (*(string + 1) << 8));
82 return (int) (sum % HASHTABSIZE);
86 _nc_make_hash_table(struct name_table_entry *table,
87 HashValue * hash_table)
93 for (i = 0; i < HASHTABSIZE; i++) {
96 for (i = 0; i < CAPTABSIZE; i++) {
97 hashvalue = hash_function(table[i].nte_name);
99 if (hash_table[hashvalue] >= 0)
102 if (hash_table[hashvalue] != 0)
103 table[i].nte_link = hash_table[hashvalue];
104 hash_table[hashvalue] = i;
107 printf("/* %d collisions out of %d entries */\n", collisions, CAPTABSIZE);
111 * This filter reads from standard input a list of tab-delimited columns,
112 * (e.g., from Caps.filtered) computes the hash-value of a specified column and
113 * writes the hashed tables to standard output.
115 * By compiling the hash table at build time, we're able to make the entire
116 * set of terminfo and termcap tables readonly (and also provide some runtime
117 * performance enhancement).
120 #define MAX_COLUMNS BUFSIZ /* this _has_ to be worst-case */
123 count_columns(char **list)
135 parse_columns(char *buffer)
141 if (list == 0 && (list = typeCalloc(char *, MAX_COLUMNS)) == 0)
144 if (*buffer != '#') {
145 while (*buffer != '\0') {
147 for (s = buffer; (*s != '\0') && !isspace(UChar(*s)); s++)
154 && (s[-1] == '"')) { /* strip the quotes */
155 assert(s > buffer + 1);
163 while (*++s && isspace(UChar(*s)))
170 return col ? list : 0;
174 main(int argc, char **argv)
176 struct name_table_entry *name_table = typeCalloc(struct
177 name_table_entry, CAPTABSIZE);
178 HashValue *hash_table = typeCalloc(HashValue, HASHTABSIZE);
179 const char *root_name = "";
185 static const char *typenames[] =
186 {"BOOLEAN", "NUMBER", "STRING"};
192 /* The first argument is the column-number (starting with 0).
193 * The second is the root name of the tables to generate.
196 || (column = atoi(argv[1])) <= 0
197 || (column >= MAX_COLUMNS)
198 || *(root_name = argv[2]) == 0
199 || (bigstring = atoi(argv[3])) < 0
201 || hash_table == 0) {
202 fprintf(stderr, "usage: make_hash column root_name bigstring\n");
207 * Read the table into our arrays.
209 for (n = 0; (n < CAPTABSIZE) && fgets(buffer, BUFSIZ, stdin);) {
210 char **list, *nlp = strchr(buffer, '\n');
213 list = parse_columns(buffer);
214 if (list == 0) /* blank or comment */
216 if (column > count_columns(list)) {
217 fprintf(stderr, "expected %d columns, have %d:\n%s\n",
223 name_table[n].nte_link = -1; /* end-of-hash */
224 name_table[n].nte_name = strdup(list[column]);
225 if (!strcmp(list[2], "bool")) {
226 name_table[n].nte_type = BOOLEAN;
227 name_table[n].nte_index = BoolCount++;
228 } else if (!strcmp(list[2], "num")) {
229 name_table[n].nte_type = NUMBER;
230 name_table[n].nte_index = NumCount++;
231 } else if (!strcmp(list[2], "str")) {
232 name_table[n].nte_type = STRING;
233 name_table[n].nte_index = StrCount++;
235 fprintf(stderr, "Unknown type: %s\n", list[2]);
240 _nc_make_hash_table(name_table, hash_table);
243 * Write the compiled tables to standard output
249 printf("static const char %s_names_text[] = \\\n", root_name);
250 for (n = 0; n < CAPTABSIZE; n++) {
251 nxt = (int) strlen(name_table[n].nte_name) + 5;
252 if (nxt + len > 72) {
256 printf("\"%s\\0\" ", name_table[n].nte_name);
262 printf("static name_table_data const %s_names_data[] =\n",
265 for (n = 0; n < CAPTABSIZE; n++) {
266 printf("\t{ %15d,\t%10s,\t%3d, %3d }%c\n",
268 typenames[name_table[n].nte_type],
269 name_table[n].nte_index,
270 name_table[n].nte_link,
271 n < CAPTABSIZE - 1 ? ',' : ' ');
272 len += (int) strlen(name_table[n].nte_name) + 1;
275 printf("static struct name_table_entry *_nc_%s_table = 0;\n\n", root_name);
278 printf("static struct name_table_entry const _nc_%s_table[] =\n",
281 for (n = 0; n < CAPTABSIZE; n++) {
282 _nc_SPRINTF(buffer, _nc_SLIMIT(sizeof(buffer)) "\"%s\"",
283 name_table[n].nte_name);
284 printf("\t{ %15s,\t%10s,\t%3d, %3d }%c\n",
286 typenames[name_table[n].nte_type],
287 name_table[n].nte_index,
288 name_table[n].nte_link,
289 n < CAPTABSIZE - 1 ? ',' : ' ');
294 printf("static const HashValue _nc_%s_hash_table[%d] =\n",
298 for (n = 0; n < HASHTABSIZE; n++) {
299 printf("\t%3d,\n", hash_table[n]);
301 printf("\t0\t/* base-of-table */\n");
304 printf("#if (BOOLCOUNT!=%d)||(NUMCOUNT!=%d)||(STRCOUNT!=%d)\n",
305 BoolCount, NumCount, StrCount);
306 printf("#error\t--> term.h and comp_captab.c disagree about the <--\n");
307 printf("#error\t--> numbers of booleans, numbers and/or strings <--\n");
308 printf("#endif\n\n");