1 /****************************************************************************
2 * Copyright 2018-2021,2022 Thomas E. Dickey *
3 * Copyright 1998-2013,2017 Free Software Foundation, Inc. *
5 * Permission is hereby granted, free of charge, to any person obtaining a *
6 * copy of this software and associated documentation files (the *
7 * "Software"), to deal in the Software without restriction, including *
8 * without limitation the rights to use, copy, modify, merge, publish, *
9 * distribute, distribute with modifications, sublicense, and/or sell *
10 * copies of the Software, and to permit persons to whom the Software is *
11 * furnished to do so, subject to the following conditions: *
13 * The above copyright notice and this permission notice shall be included *
14 * in all copies or substantial portions of the Software. *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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24 * Except as contained in this notice, the name(s) of the above copyright *
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28 ****************************************************************************/
30 /****************************************************************************
31 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
32 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
33 * and: Thomas E. Dickey 1996-on *
34 ****************************************************************************/
37 * alloc_entry.c -- allocation functions for terminfo entries
47 #include <curses.priv.h>
51 MODULE_ID("$Id: alloc_entry.c,v 1.71 2022/04/30 18:36:01 tom Exp $")
53 #define ABSENT_OFFSET -1
54 #define CANCELLED_OFFSET -2
56 static char *stringbuf; /* buffer for string capabilities */
57 static size_t next_free; /* next free character in stringbuf */
60 _nc_init_entry(ENTRY * const tp)
61 /* initialize a terminal type data block */
63 DEBUG(2, (T_CALLED("_nc_init_entry(tp=%p)"), tp));
67 if (stringbuf != NULL) {
68 FreeAndNull(stringbuf);
72 _nc_err_abort("_nc_init_entry called without initialization");
76 if (stringbuf == NULL)
77 TYPE_CALLOC(char, (size_t) MAX_ENTRY_SIZE, stringbuf);
81 _nc_init_termtype(&(tp->tterm));
83 DEBUG(2, (T_RETURN("")));
86 NCURSES_EXPORT(ENTRY *)
87 _nc_copy_entry(ENTRY * oldp)
91 DEBUG(2, (T_CALLED("_nc_copy_entry(oldp=%p)"), oldp));
93 newp = typeCalloc(ENTRY, 1);
96 _nc_copy_termtype2(&(newp->tterm), &(oldp->tterm));
99 DEBUG(2, (T_RETURN("%p"), newp));
103 /* save a copy of string in the string buffer */
104 NCURSES_EXPORT(char *)
105 _nc_save_str(const char *string)
108 size_t old_next_free = next_free;
111 if (stringbuf != NULL) {
112 if (!VALID_STRING(string))
114 len = strlen(string) + 1;
116 if (len == 1 && next_free != 0) {
118 * Cheat a little by making an empty string point to the end of the
121 if (next_free < MAX_ENTRY_SIZE) {
122 result = (stringbuf + next_free - 1);
124 } else if (next_free + len < MAX_ENTRY_SIZE) {
125 _nc_STRCPY(&stringbuf[next_free], string, MAX_ENTRY_SIZE);
126 DEBUG(7, ("Saved string %s", _nc_visbuf(string)));
127 DEBUG(7, ("at location %d", (int) next_free));
129 result = (stringbuf + old_next_free);
131 _nc_warning("Too much data, some is lost: %s", string);
138 _nc_wrap_entry(ENTRY * const ep, bool copy_strings)
139 /* copy the string parts to allocated storage, preserving pointers to it */
141 int offsets[MAX_ENTRY_SIZE / sizeof(short)];
142 int useoffsets[MAX_USES];
147 if (ep == NULL || stringbuf == NULL)
148 _nc_err_abort("_nc_wrap_entry called without initialization");
153 next_free = 0; /* clear static storage */
155 /* copy term_names, Strings, uses */
156 tp->term_names = _nc_save_str(tp->term_names);
157 for_each_string(i, tp) {
158 if (tp->Strings[i] != ABSENT_STRING &&
159 tp->Strings[i] != CANCELLED_STRING) {
160 tp->Strings[i] = _nc_save_str(tp->Strings[i]);
164 for (i = 0; i < nuses; i++) {
165 if (ep->uses[i].name == 0) {
166 ep->uses[i].name = _nc_save_str(ep->uses[i].name);
173 assert(tp->term_names >= stringbuf);
174 n = (unsigned) (tp->term_names - stringbuf);
175 for_each_string(i, &(ep->tterm)) {
176 if (i < SIZEOF(offsets)) {
177 if (tp->Strings[i] == ABSENT_STRING) {
178 offsets[i] = ABSENT_OFFSET;
179 } else if (tp->Strings[i] == CANCELLED_STRING) {
180 offsets[i] = CANCELLED_OFFSET;
182 offsets[i] = (int) (tp->Strings[i] - stringbuf);
187 for (i = 0; i < nuses; i++) {
188 if (ep->uses[i].name == 0)
189 useoffsets[i] = ABSENT_OFFSET;
191 useoffsets[i] = (int) (ep->uses[i].name - stringbuf);
194 TYPE_MALLOC(char, next_free, tp->str_table);
195 (void) memcpy(tp->str_table, stringbuf, next_free);
197 tp->term_names = tp->str_table + n;
198 for_each_string(i, &(ep->tterm)) {
199 if (i < SIZEOF(offsets)) {
200 if (offsets[i] == ABSENT_OFFSET) {
201 tp->Strings[i] = ABSENT_STRING;
202 } else if (offsets[i] == CANCELLED_OFFSET) {
203 tp->Strings[i] = CANCELLED_STRING;
205 tp->Strings[i] = tp->str_table + offsets[i];
212 if ((n = (unsigned) NUM_EXT_NAMES(tp)) != 0) {
213 if (n < SIZEOF(offsets)) {
216 for (i = 0; i < n; i++) {
217 length += strlen(tp->ext_Names[i]) + 1;
218 offsets[i] = (int) (tp->ext_Names[i] - stringbuf);
220 TYPE_MALLOC(char, length, tp->ext_str_table);
221 for (i = 0, offset = 0; i < n; i++) {
222 tp->ext_Names[i] = tp->ext_str_table + offset;
223 _nc_STRCPY(tp->ext_Names[i],
224 stringbuf + offsets[i],
226 offset += strlen(tp->ext_Names[i]) + 1;
233 for (i = 0; i < nuses; i++) {
234 if (useoffsets[i] == ABSENT_OFFSET)
235 ep->uses[i].name = 0;
237 ep->uses[i].name = (tp->str_table + useoffsets[i]);
242 _nc_merge_entry(ENTRY * const target, ENTRY * const source)
243 /* merge capabilities from `from' entry into `to' entry */
245 TERMTYPE2 *to = &(target->tterm);
246 TERMTYPE2 *from = &(source->tterm);
252 if (source == 0 || from == 0 || target == 0 || to == 0)
256 _nc_copy_termtype2(©, from);
258 _nc_align_termtype(to, from);
260 for_each_boolean(i, from) {
261 if (to->Booleans[i] != (NCURSES_SBOOL) CANCELLED_BOOLEAN) {
262 int mergebool = from->Booleans[i];
264 if (mergebool == CANCELLED_BOOLEAN)
265 to->Booleans[i] = FALSE;
266 else if (mergebool == TRUE)
267 to->Booleans[i] = (NCURSES_SBOOL) mergebool;
271 for_each_number(i, from) {
272 if (to->Numbers[i] != CANCELLED_NUMERIC) {
273 int mergenum = from->Numbers[i];
275 if (mergenum == CANCELLED_NUMERIC)
276 to->Numbers[i] = ABSENT_NUMERIC;
277 else if (mergenum != ABSENT_NUMERIC)
278 to->Numbers[i] = (NCURSES_INT2) mergenum;
283 * Note: the copies of strings this makes don't have their own
284 * storage. This is OK right now, but will be a problem if we
285 * we ever want to deallocate entries.
287 for_each_string(i, from) {
288 if (to->Strings[i] != CANCELLED_STRING) {
289 char *mergestring = from->Strings[i];
291 if (mergestring == CANCELLED_STRING)
292 to->Strings[i] = ABSENT_STRING;
293 else if (mergestring != ABSENT_STRING)
294 to->Strings[i] = mergestring;
298 /* Discard the data allocated in _nc_copy_termtype2, but do not use
299 * _nc_free_termtype2 because that frees the string-table (which is
300 * not allocated by _nc_copy_termtype2).
305 free(copy.ext_Names);
311 _nc_alloc_entry_leaks(void)
313 if (stringbuf != NULL) {
314 FreeAndNull(stringbuf);