aboutsummaryrefslogtreecommitdiff
path: root/ncurses/tinfo/make_hash.c
diff options
context:
space:
mode:
Diffstat (limited to 'ncurses/tinfo/make_hash.c')
-rw-r--r--ncurses/tinfo/make_hash.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/ncurses/tinfo/make_hash.c b/ncurses/tinfo/make_hash.c
new file mode 100644
index 000000000000..15c281def50c
--- /dev/null
+++ b/ncurses/tinfo/make_hash.c
@@ -0,0 +1,294 @@
+/****************************************************************************
+ * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc. *
+ * *
+ * Permission is hereby granted, free of charge, to any person obtaining a *
+ * copy of this software and associated documentation files (the *
+ * "Software"), to deal in the Software without restriction, including *
+ * without limitation the rights to use, copy, modify, merge, publish, *
+ * distribute, distribute with modifications, sublicense, and/or sell *
+ * copies of the Software, and to permit persons to whom the Software is *
+ * furnished to do so, subject to the following conditions: *
+ * *
+ * The above copyright notice and this permission notice shall be included *
+ * in all copies or substantial portions of the Software. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+ * *
+ * Except as contained in this notice, the name(s) of the above copyright *
+ * holders shall not be used in advertising or otherwise to promote the *
+ * sale, use or other dealings in this Software without prior written *
+ * authorization. *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
+ * and: Eric S. Raymond <esr@snark.thyrsus.com> *
+ * and: Thomas E. Dickey 1996-on *
+ ****************************************************************************/
+
+/*
+ * make_hash.c --- build-time program for constructing comp_captab.c
+ *
+ */
+
+#include <build.priv.h>
+
+#include <tic.h>
+#include <hashsize.h>
+
+#include <ctype.h>
+
+MODULE_ID("$Id: make_hash.c,v 1.3 2010/05/22 18:02:50 tom Exp $")
+
+/*
+ * _nc_make_hash_table()
+ *
+ * Takes the entries in table[] and hashes them into hash_table[]
+ * by name. There are CAPTABSIZE entries in table[] and HASHTABSIZE
+ * slots in hash_table[].
+ *
+ */
+
+#undef MODULE_ID
+#define MODULE_ID(id) /*nothing */
+#include <tinfo/doalloc.c>
+
+/*
+ * int hash_function(string)
+ *
+ * Computes the hashing function on the given string.
+ *
+ * The current hash function is the sum of each consectutive pair
+ * of characters, taken as two-byte integers, mod HASHTABSIZE.
+ *
+ */
+
+static int
+hash_function(const char *string)
+{
+ long sum = 0;
+
+ while (*string) {
+ sum += (long) (*string + (*(string + 1) << 8));
+ string++;
+ }
+
+ return (int) (sum % HASHTABSIZE);
+}
+
+static void
+_nc_make_hash_table(struct name_table_entry *table,
+ HashValue * hash_table)
+{
+ short i;
+ int hashvalue;
+ int collisions = 0;
+
+ for (i = 0; i < HASHTABSIZE; i++) {
+ hash_table[i] = -1;
+ }
+ for (i = 0; i < CAPTABSIZE; i++) {
+ hashvalue = hash_function(table[i].nte_name);
+
+ if (hash_table[hashvalue] >= 0)
+ collisions++;
+
+ if (hash_table[hashvalue] != 0)
+ table[i].nte_link = hash_table[hashvalue];
+ hash_table[hashvalue] = i;
+ }
+
+ printf("/* %d collisions out of %d entries */\n", collisions, CAPTABSIZE);
+}
+
+/*
+ * This filter reads from standard input a list of tab-delimited columns,
+ * (e.g., from Caps.filtered) computes the hash-value of a specified column and
+ * writes the hashed tables to standard output.
+ *
+ * By compiling the hash table at build time, we're able to make the entire
+ * set of terminfo and termcap tables readonly (and also provide some runtime
+ * performance enhancement).
+ */
+
+#define MAX_COLUMNS BUFSIZ /* this _has_ to be worst-case */
+
+static char **
+parse_columns(char *buffer)
+{
+ static char **list;
+
+ int col = 0;
+
+ if (list == 0 && (list = typeCalloc(char *, MAX_COLUMNS)) == 0)
+ return (0);
+
+ if (*buffer != '#') {
+ while (*buffer != '\0') {
+ char *s;
+ for (s = buffer; (*s != '\0') && !isspace(UChar(*s)); s++)
+ /*EMPTY */ ;
+ if (s != buffer) {
+ char mark = *s;
+ *s = '\0';
+ if ((s - buffer) > 1
+ && (*buffer == '"')
+ && (s[-1] == '"')) { /* strip the quotes */
+ assert(s > buffer + 1);
+ s[-1] = '\0';
+ buffer++;
+ }
+ list[col] = buffer;
+ col++;
+ if (mark == '\0')
+ break;
+ while (*++s && isspace(UChar(*s)))
+ /*EMPTY */ ;
+ buffer = s;
+ } else
+ break;
+ }
+ }
+ return col ? list : 0;
+}
+
+int
+main(int argc, char **argv)
+{
+ struct name_table_entry *name_table = typeCalloc(struct
+ name_table_entry, CAPTABSIZE);
+ HashValue *hash_table = typeCalloc(HashValue, HASHTABSIZE);
+ const char *root_name = "";
+ int column = 0;
+ int bigstring = 0;
+ int n;
+ char buffer[BUFSIZ];
+
+ static const char *typenames[] =
+ {"BOOLEAN", "NUMBER", "STRING"};
+
+ short BoolCount = 0;
+ short NumCount = 0;
+ short StrCount = 0;
+
+ /* The first argument is the column-number (starting with 0).
+ * The second is the root name of the tables to generate.
+ */
+ if (argc <= 3
+ || (column = atoi(argv[1])) <= 0
+ || (column >= MAX_COLUMNS)
+ || *(root_name = argv[2]) == 0
+ || (bigstring = atoi(argv[3])) < 0
+ || name_table == 0
+ || hash_table == 0) {
+ fprintf(stderr, "usage: make_hash column root_name bigstring\n");
+ exit(EXIT_FAILURE);
+ }
+
+ /*
+ * Read the table into our arrays.
+ */
+ for (n = 0; (n < CAPTABSIZE) && fgets(buffer, BUFSIZ, stdin);) {
+ char **list, *nlp = strchr(buffer, '\n');
+ if (nlp)
+ *nlp = '\0';
+ list = parse_columns(buffer);
+ if (list == 0) /* blank or comment */
+ continue;
+ name_table[n].nte_link = -1; /* end-of-hash */
+ name_table[n].nte_name = strdup(list[column]);
+ if (!strcmp(list[2], "bool")) {
+ name_table[n].nte_type = BOOLEAN;
+ name_table[n].nte_index = BoolCount++;
+ } else if (!strcmp(list[2], "num")) {
+ name_table[n].nte_type = NUMBER;
+ name_table[n].nte_index = NumCount++;
+ } else if (!strcmp(list[2], "str")) {
+ name_table[n].nte_type = STRING;
+ name_table[n].nte_index = StrCount++;
+ } else {
+ fprintf(stderr, "Unknown type: %s\n", list[2]);
+ exit(EXIT_FAILURE);
+ }
+ n++;
+ }
+ _nc_make_hash_table(name_table, hash_table);
+
+ /*
+ * Write the compiled tables to standard output
+ */
+ if (bigstring) {
+ int len = 0;
+ int nxt;
+
+ printf("static const char %s_names_text[] = \\\n", root_name);
+ for (n = 0; n < CAPTABSIZE; n++) {
+ nxt = (int) strlen(name_table[n].nte_name) + 5;
+ if (nxt + len > 72) {
+ printf("\\\n");
+ len = 0;
+ }
+ printf("\"%s\\0\" ", name_table[n].nte_name);
+ len += nxt;
+ }
+ printf(";\n\n");
+
+ len = 0;
+ printf("static name_table_data const %s_names_data[] =\n",
+ root_name);
+ printf("{\n");
+ for (n = 0; n < CAPTABSIZE; n++) {
+ printf("\t{ %15d,\t%10s,\t%3d, %3d }%c\n",
+ len,
+ typenames[name_table[n].nte_type],
+ name_table[n].nte_index,
+ name_table[n].nte_link,
+ n < CAPTABSIZE - 1 ? ',' : ' ');
+ len += (int) strlen(name_table[n].nte_name) + 1;
+ }
+ printf("};\n\n");
+ printf("static struct name_table_entry *_nc_%s_table = 0;\n\n", root_name);
+ } else {
+
+ printf("static struct name_table_entry %s _nc_%s_table[] =\n",
+ bigstring ? "" : "const",
+ root_name);
+ printf("{\n");
+ for (n = 0; n < CAPTABSIZE; n++) {
+ sprintf(buffer, "\"%s\"",
+ name_table[n].nte_name);
+ printf("\t{ %15s,\t%10s,\t%3d, %3d }%c\n",
+ buffer,
+ typenames[name_table[n].nte_type],
+ name_table[n].nte_index,
+ name_table[n].nte_link,
+ n < CAPTABSIZE - 1 ? ',' : ' ');
+ }
+ printf("};\n\n");
+ }
+
+ printf("static const HashValue _nc_%s_hash_table[%d] =\n",
+ root_name,
+ HASHTABSIZE + 1);
+ printf("{\n");
+ for (n = 0; n < HASHTABSIZE; n++) {
+ printf("\t%3d,\n", hash_table[n]);
+ }
+ printf("\t0\t/* base-of-table */\n");
+ printf("};\n\n");
+
+ printf("#if (BOOLCOUNT!=%d)||(NUMCOUNT!=%d)||(STRCOUNT!=%d)\n",
+ BoolCount, NumCount, StrCount);
+ printf("#error\t--> term.h and comp_captab.c disagree about the <--\n");
+ printf("#error\t--> numbers of booleans, numbers and/or strings <--\n");
+ printf("#endif\n\n");
+
+ free(hash_table);
+ return EXIT_SUCCESS;
+}