#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 1.39 2009/07/11 18:27:26 tom Exp $")
-
-static int hash_function(const char *);
+MODULE_ID("$Id: comp_hash.c,v 1.48 2009/08/08 17:36:21 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[].
- *
+ * 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.
*/
-
-#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
-
-#define SameName(a,b,termcap) (termcap ? !strncmp(a,b,2) : !strcmp(a,b))
-#if 0
-static bool
-same_name(const char *a, const char *b, bool termcap)
-{
- fprintf(stderr, "compare(%s,%s)\n", a, b);
- return SameName(a, b, termcap);
-}
-#else
-#define same_name(a,b,termcap) SameName(a,b,termcap)
-#endif
-
+/* entrypoint used by tack (do not alter) */
NCURSES_EXPORT(struct name_table_entry const *)
_nc_find_entry(const char *string,
- const short *hash_table)
+ const HashValue * hash_table)
{
+ bool termcap = (hash_table != _nc_get_hash_table(FALSE));
+ const HashData *data = _nc_get_hash_info(termcap);
int hashvalue;
struct name_table_entry const *ptr = 0;
struct name_table_entry const *real_table;
- hashvalue = hash_function(string);
+ hashvalue = data->hash_of(string);
- if (hash_table[hashvalue] >= 0) {
- bool termcap = (hash_table != _nc_get_hash_table(FALSE));
+ if (data->table_data[hashvalue] >= 0) {
real_table = _nc_get_table(termcap);
- ptr = real_table + hash_table[hashvalue];
- while (!same_name(ptr->nte_name, string, termcap)) {
- if (ptr->nte_link < 0)
- return 0;
- ptr = real_table + (ptr->nte_link + hash_table[HASHTABSIZE]);
+ ptr = real_table + data->table_data[hashvalue];
+ while (!data->compare_names(ptr->nte_name, string)) {
+ if (ptr->nte_link < 0) {
+ ptr = 0;
+ break;
+ }
+ ptr = real_table + (ptr->nte_link
+ + data->table_data[data->table_size]);
}
}
}
/*
- * struct name_table_entry *
- * find_type_entry(string, type, table)
+ * Finds the entry for the given name with the given type in the given table if
+ * present (as distinct from _nc_find_entry, which finds the last entry
+ * regardless of type).
*
- * 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.
+ * 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,
bool termcap)
{
- struct name_table_entry const *result = NULL;
- const struct name_table_entry *const table = _nc_get_table(termcap);
- struct name_table_entry const *ptr;
-
- for (ptr = table; ptr < table + CAPTABSIZE; ptr++) {
- if (ptr->nte_type == type) {
- if (same_name(ptr->nte_name, string, termcap)) {
- result = ptr;
- }
- }
- }
-
- return result;
-}
-#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
+ struct name_table_entry const *ptr = NULL;
+ const HashData *data = _nc_get_hash_info(termcap);
+ int hashvalue = data->hash_of(string);
+
+ if (data->table_data[hashvalue] >= 0) {
+ const struct name_table_entry *const table = _nc_get_table(termcap);
+
+ ptr = table + data->table_data[hashvalue];
+ while (ptr->nte_type != type
+ || !data->compare_names(ptr->nte_name, string)) {
+ if (ptr->nte_link < 0) {
+ ptr = 0;
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;
+ ptr = table + (ptr->nte_link + data->table_data[data->table_size]);
}
- 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;
+ return ptr;
}
-#endif
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