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2 * Copyright (c) 1998-2010,2011 Free Software Foundation, Inc. *
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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 *
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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 *
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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>
42 #include <term_entry.h>
48 MODULE_ID("$Id: make_hash.c,v 1.4 2011/10/08 21:11:54 tom Exp $")
51 * _nc_make_hash_table()
53 * Takes the entries in table[] and hashes them into hash_table[]
54 * by name. There are CAPTABSIZE entries in table[] and HASHTABSIZE
55 * slots in hash_table[].
60 #define MODULE_ID(id) /*nothing */
61 #include <tinfo/doalloc.c>
64 * int hash_function(string)
66 * Computes the hashing function on the given string.
68 * The current hash function is the sum of each consectutive pair
69 * of characters, taken as two-byte integers, mod HASHTABSIZE.
74 hash_function(const char *string)
79 sum += (long) (*string + (*(string + 1) << 8));
83 return (int) (sum % HASHTABSIZE);
87 _nc_make_hash_table(struct name_table_entry *table,
88 HashValue * hash_table)
94 for (i = 0; i < HASHTABSIZE; i++) {
97 for (i = 0; i < CAPTABSIZE; i++) {
98 hashvalue = hash_function(table[i].nte_name);
100 if (hash_table[hashvalue] >= 0)
103 if (hash_table[hashvalue] != 0)
104 table[i].nte_link = hash_table[hashvalue];
105 hash_table[hashvalue] = i;
108 printf("/* %d collisions out of %d entries */\n", collisions, CAPTABSIZE);
112 * This filter reads from standard input a list of tab-delimited columns,
113 * (e.g., from Caps.filtered) computes the hash-value of a specified column and
114 * writes the hashed tables to standard output.
116 * By compiling the hash table at build time, we're able to make the entire
117 * set of terminfo and termcap tables readonly (and also provide some runtime
118 * performance enhancement).
121 #define MAX_COLUMNS BUFSIZ /* this _has_ to be worst-case */
124 parse_columns(char *buffer)
130 if (list == 0 && (list = typeCalloc(char *, MAX_COLUMNS)) == 0)
133 if (*buffer != '#') {
134 while (*buffer != '\0') {
136 for (s = buffer; (*s != '\0') && !isspace(UChar(*s)); s++)
143 && (s[-1] == '"')) { /* strip the quotes */
144 assert(s > buffer + 1);
152 while (*++s && isspace(UChar(*s)))
159 return col ? list : 0;
163 main(int argc, char **argv)
165 struct name_table_entry *name_table = typeCalloc(struct
166 name_table_entry, CAPTABSIZE);
167 HashValue *hash_table = typeCalloc(HashValue, HASHTABSIZE);
168 const char *root_name = "";
174 static const char *typenames[] =
175 {"BOOLEAN", "NUMBER", "STRING"};
181 /* The first argument is the column-number (starting with 0).
182 * The second is the root name of the tables to generate.
185 || (column = atoi(argv[1])) <= 0
186 || (column >= MAX_COLUMNS)
187 || *(root_name = argv[2]) == 0
188 || (bigstring = atoi(argv[3])) < 0
190 || hash_table == 0) {
191 fprintf(stderr, "usage: make_hash column root_name bigstring\n");
196 * Read the table into our arrays.
198 for (n = 0; (n < CAPTABSIZE) && fgets(buffer, BUFSIZ, stdin);) {
199 char **list, *nlp = strchr(buffer, '\n');
202 list = parse_columns(buffer);
203 if (list == 0) /* blank or comment */
205 name_table[n].nte_link = -1; /* end-of-hash */
206 name_table[n].nte_name = strdup(list[column]);
207 if (!strcmp(list[2], "bool")) {
208 name_table[n].nte_type = BOOLEAN;
209 name_table[n].nte_index = BoolCount++;
210 } else if (!strcmp(list[2], "num")) {
211 name_table[n].nte_type = NUMBER;
212 name_table[n].nte_index = NumCount++;
213 } else if (!strcmp(list[2], "str")) {
214 name_table[n].nte_type = STRING;
215 name_table[n].nte_index = StrCount++;
217 fprintf(stderr, "Unknown type: %s\n", list[2]);
222 _nc_make_hash_table(name_table, hash_table);
225 * Write the compiled tables to standard output
231 printf("static const char %s_names_text[] = \\\n", root_name);
232 for (n = 0; n < CAPTABSIZE; n++) {
233 nxt = (int) strlen(name_table[n].nte_name) + 5;
234 if (nxt + len > 72) {
238 printf("\"%s\\0\" ", name_table[n].nte_name);
244 printf("static name_table_data const %s_names_data[] =\n",
247 for (n = 0; n < CAPTABSIZE; n++) {
248 printf("\t{ %15d,\t%10s,\t%3d, %3d }%c\n",
250 typenames[name_table[n].nte_type],
251 name_table[n].nte_index,
252 name_table[n].nte_link,
253 n < CAPTABSIZE - 1 ? ',' : ' ');
254 len += (int) strlen(name_table[n].nte_name) + 1;
257 printf("static struct name_table_entry *_nc_%s_table = 0;\n\n", root_name);
260 printf("static struct name_table_entry %s _nc_%s_table[] =\n",
261 bigstring ? "" : "const",
264 for (n = 0; n < CAPTABSIZE; n++) {
265 sprintf(buffer, "\"%s\"",
266 name_table[n].nte_name);
267 printf("\t{ %15s,\t%10s,\t%3d, %3d }%c\n",
269 typenames[name_table[n].nte_type],
270 name_table[n].nte_index,
271 name_table[n].nte_link,
272 n < CAPTABSIZE - 1 ? ',' : ' ');
277 printf("static const HashValue _nc_%s_hash_table[%d] =\n",
281 for (n = 0; n < HASHTABSIZE; n++) {
282 printf("\t%3d,\n", hash_table[n]);
284 printf("\t0\t/* base-of-table */\n");
287 printf("#if (BOOLCOUNT!=%d)||(NUMCOUNT!=%d)||(STRCOUNT!=%d)\n",
288 BoolCount, NumCount, StrCount);
289 printf("#error\t--> term.h and comp_captab.c disagree about the <--\n");
290 printf("#error\t--> numbers of booleans, numbers and/or strings <--\n");
291 printf("#endif\n\n");