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27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Thomas E. Dickey *
31 ****************************************************************************/
34 * Iterators for terminal databases.
37 #include <curses.priv.h>
43 #include <hashed_db.h>
46 MODULE_ID("$Id: db_iterator.c,v 1.28 2012/01/21 23:56:17 tom Exp $")
48 #define HaveTicDirectory _nc_globals.have_tic_directory
49 #define KeepTicDirectory _nc_globals.keep_tic_directory
50 #define TicDirectory _nc_globals.tic_directory
51 #define my_blob _nc_globals.dbd_blob
52 #define my_list _nc_globals.dbd_list
53 #define my_size _nc_globals.dbd_size
54 #define my_time _nc_globals.dbd_time
55 #define my_vars _nc_globals.dbd_vars
58 add_to_blob(const char *text)
61 char *last = my_blob + strlen(my_blob);
63 *last++ = NCURSES_PATHSEP;
69 check_existence(const char *name, struct stat *sb)
73 if (stat(name, sb) == 0
74 && (S_ISDIR(sb->st_mode) || S_ISREG(sb->st_mode))) {
78 else if (strlen(name) < PATH_MAX - sizeof(DBM_SUFFIX)) {
80 sprintf(temp, "%s%s", name, DBM_SUFFIX);
81 if (stat(temp, sb) == 0 && S_ISREG(sb->st_mode)) {
90 * Store the latest value of an environment variable in my_vars[] so we can
91 * detect if one changes, invalidating the cached search-list.
94 update_getenv(const char *name, DBDIRS which)
97 char *value = getenv(name);
99 if (which < dbdLAST) {
100 if (my_vars[which].name == 0 || strcmp(my_vars[which].name, name)) {
101 FreeIfNeeded(my_vars[which].value);
102 my_vars[which].name = name;
103 my_vars[which].value = value;
105 } else if ((my_vars[which].value != 0) ^ (value != 0)) {
106 FreeIfNeeded(my_vars[which].value);
107 my_vars[which].value = value;
109 } else if (value != 0 && strcmp(value, my_vars[which].value)) {
110 FreeIfNeeded(my_vars[which].value);
111 my_vars[which].value = value;
119 cache_getenv(const char *name, DBDIRS which)
123 (void) update_getenv(name, which);
124 if (which < dbdLAST) {
125 result = my_vars[which].value;
131 * The cache expires if at least a second has passed since the initial lookup,
132 * or if one of the environment variables changed.
134 * Only a few applications use multiple lookups of terminal entries, seems that
135 * aside from bulk I/O such as tic and toe, that leaves interactive programs
136 * which should not be modifying the terminal databases in a way that would
137 * invalidate the search-list.
139 * The "1-second" is to allow for user-directed changes outside the program.
145 time_t now = time((time_t *) 0);
151 for (n = (DBDIRS) 0; n < dbdLAST; ++n) {
152 if (my_vars[n].name != 0
153 && update_getenv(my_vars[n].name, n)) {
165 FreeAndNull(my_blob);
166 FreeAndNull(my_list);
170 * Record the "official" location of the terminfo directory, according to
171 * the place where we're writing to, or the normal default, if not.
173 NCURSES_EXPORT(const char *)
174 _nc_tic_dir(const char *path)
176 T(("_nc_tic_dir %s", NonNull(path)));
177 if (!KeepTicDirectory) {
180 HaveTicDirectory = TRUE;
181 } else if (!HaveTicDirectory && use_terminfo_vars()) {
183 if ((envp = getenv("TERMINFO")) != 0)
184 return _nc_tic_dir(envp);
187 return TicDirectory ? TicDirectory : TERMINFO;
191 * Special fix to prevent the terminfo directory from being moved after tic
192 * has chdir'd to it. If we let it be changed, then if $TERMINFO has a
193 * relative path, we'll lose track of the actual directory.
196 _nc_keep_tic_dir(const char *path)
199 KeepTicDirectory = TRUE;
208 if (my_blob != 0 && cache_expired()) {
214 * This is a simple iterator which allows the caller to step through the
215 * possible locations for a terminfo directory. ncurses uses this to find
216 * terminfo files to read.
218 NCURSES_EXPORT(const char *)
219 _nc_next_db(DBDIRS * state, int *offset)
224 if ((int) *state < my_size
226 && my_list[*state] != 0) {
227 result = my_list[*state];
233 T(("_nc_next_db %d %s", *state, result));
239 _nc_first_db(DBDIRS * state, int *offset)
246 /* build a blob containing all of the strings we will use for a lookup
251 const char *values[dbdLAST];
252 struct stat *my_stat;
255 for (j = 0; j < dbdLAST; ++j)
259 * This is the first item in the list, and is used only when tic is
260 * writing to the database, as a performance improvement.
262 values[dbdTIC] = TicDirectory;
266 values[dbdCfgList] = TERMINFO_DIRS;
269 values[dbdCfgOnce] = TERMINFO;
274 values[dbdCfgList2] = TERMPATH;
277 if (use_terminfo_vars()) {
279 values[dbdEnvOnce] = cache_getenv("TERMINFO", dbdEnvOnce);
280 values[dbdHome] = _nc_home_terminfo();
281 (void) cache_getenv("HOME", dbdHome);
282 values[dbdEnvList] = cache_getenv("TERMINFO_DIRS", dbdEnvList);
286 values[dbdEnvOnce2] = cache_getenv("TERMCAP", dbdEnvOnce2);
287 /* only use $TERMCAP if it is an absolute path */
288 if (values[dbdEnvOnce2] != 0
289 && *values[dbdEnvOnce2] != '/') {
290 values[dbdEnvOnce2] = 0;
292 values[dbdEnvList2] = cache_getenv("TERMPATH", dbdEnvList2);
293 #endif /* USE_TERMCAP */
296 for (j = 0; j < dbdLAST; ++j) {
299 blobsize += 2 + strlen(values[j]);
302 my_blob = malloc(blobsize);
305 for (j = 0; j < dbdLAST; ++j) {
306 add_to_blob(values[j]);
309 /* Now, build an array which will be pointers to the distinct
310 * strings in the blob.
313 for (j = 0; my_blob[j] != '\0'; ++j) {
314 if (my_blob[j] == NCURSES_PATHSEP)
317 my_list = typeCalloc(char *, blobsize);
318 my_stat = typeCalloc(struct stat, blobsize);
319 if (my_list != 0 && my_stat != 0) {
321 my_list[k++] = my_blob;
322 for (j = 0; my_blob[j] != '\0'; ++j) {
323 if (my_blob[j] == NCURSES_PATHSEP) {
325 my_list[k++] = &my_blob[j + 1];
330 * Eliminate duplicates from the list.
332 for (j = 0; my_list[j] != 0; ++j) {
334 if (*my_list[j] == '\0')
335 my_list[j] = strdup(TERMINFO);
337 for (k = 0; k < j; ++k) {
338 if (!strcmp(my_list[j], my_list[k])) {
340 while ((my_list[j] = my_list[j + 1]) != 0) {
350 * Eliminate non-existent databases, and those that happen to
351 * be symlinked to another location.
353 for (j = 0; my_list[j] != 0; ++j) {
354 bool found = check_existence(my_list[j], &my_stat[j]);
357 for (k = 0; k < j; ++k) {
358 if (my_stat[j].st_dev == my_stat[k].st_dev
359 && my_stat[j].st_ino == my_stat[k].st_ino) {
368 while ((my_list[k] = my_list[k + 1]) != 0) {
375 my_time = time((time_t *) 0);
377 FreeAndNull(my_blob);
386 _nc_db_iterator_leaks(void)
389 FreeAndNull(my_blob);
391 FreeAndNull(my_list);