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/****************************************************************************
* Copyright (c) 1998-2007,2008 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 *
****************************************************************************/
/*
* comp_hash.c --- Routines to deal with the hashtable of capability
* names.
*
*/
#define USE_TERMLIB 1
#include <curses.priv.h>
#include <tic.h>
#include <hashsize.h>
#ifdef MAIN_PROGRAM
#include <ctype.h>
#undef DEBUG
#define DEBUG(level, params) /*nothing */
#endif
MODULE_ID("$Id: comp_hash.c,v 1.36 2008/08/16 17:06:53 tom Exp $")
static int hash_function(const char *);
/*
* _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[].
*
*/
#ifdef MAIN_PROGRAM
#undef MODULE_ID
#define MODULE_ID(id) /*nothing */
#include <tinfo/doalloc.c>
static void
_nc_make_hash_table(struct name_table_entry *table,
short *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;
}
DEBUG(4, ("Hash table complete: %d collisions out of %d entries",
collisions, CAPTABSIZE));
}
#endif
/*
* 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;
DEBUG(9, ("hashing %s", string));
while (*string) {
sum += (long) (*string + (*(string + 1) << 8));
string++;
}
DEBUG(9, ("sum is %ld", sum));
return (int) (sum % HASHTABSIZE);
}
/*
* struct name_table_entry *
* find_entry(string)
*
* Finds the entry for the given string in the hash table if present.
* Returns a pointer to the entry in the table or 0 if not found.
*
*/
#ifndef MAIN_PROGRAM
NCURSES_EXPORT(struct name_table_entry const *)
_nc_find_entry(const char *string,
const short *hash_table)
{
int hashvalue;
struct name_table_entry const *ptr = 0;
struct name_table_entry const *real_table;
hashvalue = hash_function(string);
if (hash_table[hashvalue] >= 0) {
real_table = _nc_get_table(hash_table != _nc_get_hash_table(FALSE));
ptr = real_table + hash_table[hashvalue];
while (strcmp(ptr->nte_name, string) != 0) {
if (ptr->nte_link < 0)
return 0;
ptr = real_table + (ptr->nte_link + hash_table[HASHTABSIZE]);
}
}
return (ptr);
}
/*
* struct name_table_entry *
* find_type_entry(string, type, table)
*
* Finds the first entry for the given name with the given type in the
* given table if present (as distinct from find_entry, which finds the
* the last entry regardless of type). You can use this if you detect
* a name clash. It's slower, though. Returns a pointer to the entry
* in the table or 0 if not found.
*/
NCURSES_EXPORT(struct name_table_entry const *)
_nc_find_type_entry(const char *string,
int type,
const struct name_table_entry *table)
{
struct name_table_entry const *ptr;
for (ptr = table; ptr < table + CAPTABSIZE; ptr++) {
if (ptr->nte_type == type && strcmp(string, ptr->nte_name) == 0)
return (ptr);
}
return ((struct name_table_entry *) NULL);
}
#endif
#ifdef MAIN_PROGRAM
/*
* 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);
short *hash_table = typeCalloc(short, 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 short _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;
}
#endif