/* $NetBSD: getch.c,v 1.51 2008/04/14 20:32:53 jdc Exp $ */ /* * Copyright (c) 1981, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #ifndef lint #if 0 static char sccsid[] = "@(#)getch.c 8.2 (Berkeley) 5/4/94"; #else __RCSID("$NetBSD: getch.c,v 1.51 2008/04/14 20:32:53 jdc Exp $"); #endif #endif /* not lint */ #include #include #include #include #include "curses.h" #include "curses_private.h" #include "keymap.h" short state; /* state of the inkey function */ static const struct tcdata tc[] = { {"!1", KEY_SSAVE}, {"!2", KEY_SSUSPEND}, {"!3", KEY_SUNDO}, {"#1", KEY_SHELP}, {"#2", KEY_SHOME}, {"#3", KEY_SIC}, {"#4", KEY_SLEFT}, {"%0", KEY_REDO}, {"%1", KEY_HELP}, {"%2", KEY_MARK}, {"%3", KEY_MESSAGE}, {"%4", KEY_MOVE}, {"%5", KEY_NEXT}, {"%6", KEY_OPEN}, {"%7", KEY_OPTIONS}, {"%8", KEY_PREVIOUS}, {"%9", KEY_PRINT}, {"%a", KEY_SMESSAGE}, {"%b", KEY_SMOVE}, {"%c", KEY_SNEXT}, {"%d", KEY_SOPTIONS}, {"%e", KEY_SPREVIOUS}, {"%f", KEY_SPRINT}, {"%g", KEY_SREDO}, {"%h", KEY_SREPLACE}, {"%i", KEY_SRIGHT}, {"%j", KEY_SRSUME}, {"&0", KEY_SCANCEL}, {"&1", KEY_REFERENCE}, {"&2", KEY_REFRESH}, {"&3", KEY_REPLACE}, {"&4", KEY_RESTART}, {"&5", KEY_RESUME}, {"&6", KEY_SAVE}, {"&7", KEY_SUSPEND}, {"&8", KEY_UNDO}, {"&9", KEY_SBEG}, {"*0", KEY_SFIND}, {"*1", KEY_SCOMMAND}, {"*2", KEY_SCOPY}, {"*3", KEY_SCREATE}, {"*4", KEY_SDC}, {"*5", KEY_SDL}, {"*6", KEY_SELECT}, {"*7", KEY_SEND}, {"*8", KEY_SEOL}, {"*9", KEY_SEXIT}, {"@0", KEY_FIND}, {"@1", KEY_BEG}, {"@2", KEY_CANCEL}, {"@3", KEY_CLOSE}, {"@4", KEY_COMMAND}, {"@5", KEY_COPY}, {"@6", KEY_CREATE}, {"@7", KEY_END}, {"@8", KEY_ENTER}, {"@9", KEY_EXIT}, {"F1", KEY_F(11)}, {"F2", KEY_F(12)}, {"F3", KEY_F(13)}, {"F4", KEY_F(14)}, {"F5", KEY_F(15)}, {"F6", KEY_F(16)}, {"F7", KEY_F(17)}, {"F8", KEY_F(18)}, {"F9", KEY_F(19)}, {"FA", KEY_F(20)}, {"FB", KEY_F(21)}, {"FC", KEY_F(22)}, {"FD", KEY_F(23)}, {"FE", KEY_F(24)}, {"FF", KEY_F(25)}, {"FG", KEY_F(26)}, {"FH", KEY_F(27)}, {"FI", KEY_F(28)}, {"FJ", KEY_F(29)}, {"FK", KEY_F(30)}, {"FL", KEY_F(31)}, {"FM", KEY_F(32)}, {"FN", KEY_F(33)}, {"FO", KEY_F(34)}, {"FP", KEY_F(35)}, {"FQ", KEY_F(36)}, {"FR", KEY_F(37)}, {"FS", KEY_F(38)}, {"FT", KEY_F(39)}, {"FU", KEY_F(40)}, {"FV", KEY_F(41)}, {"FW", KEY_F(42)}, {"FX", KEY_F(43)}, {"FY", KEY_F(44)}, {"FZ", KEY_F(45)}, {"Fa", KEY_F(46)}, {"Fb", KEY_F(47)}, {"Fc", KEY_F(48)}, {"Fd", KEY_F(49)}, {"Fe", KEY_F(50)}, {"Ff", KEY_F(51)}, {"Fg", KEY_F(52)}, {"Fh", KEY_F(53)}, {"Fi", KEY_F(54)}, {"Fj", KEY_F(55)}, {"Fk", KEY_F(56)}, {"Fl", KEY_F(57)}, {"Fm", KEY_F(58)}, {"Fn", KEY_F(59)}, {"Fo", KEY_F(60)}, {"Fp", KEY_F(61)}, {"Fq", KEY_F(62)}, {"Fr", KEY_F(63)}, {"K1", KEY_A1}, {"K2", KEY_B2}, {"K3", KEY_A3}, {"K4", KEY_C1}, {"K5", KEY_C3}, {"Km", KEY_MOUSE}, {"k0", KEY_F0}, {"k1", KEY_F(1)}, {"k2", KEY_F(2)}, {"k3", KEY_F(3)}, {"k4", KEY_F(4)}, {"k5", KEY_F(5)}, {"k6", KEY_F(6)}, {"k7", KEY_F(7)}, {"k8", KEY_F(8)}, {"k9", KEY_F(9)}, {"k;", KEY_F(10)}, {"kA", KEY_IL}, {"ka", KEY_CATAB}, {"kB", KEY_BTAB}, {"kb", KEY_BACKSPACE}, {"kC", KEY_CLEAR}, {"kD", KEY_DC}, {"kd", KEY_DOWN}, {"kE", KEY_EOL}, {"kF", KEY_SF}, {"kH", KEY_LL}, {"kh", KEY_HOME}, {"kI", KEY_IC}, {"kL", KEY_DL}, {"kl", KEY_LEFT}, {"kM", KEY_EIC}, {"kN", KEY_NPAGE}, {"kP", KEY_PPAGE}, {"kR", KEY_SR}, {"kr", KEY_RIGHT}, {"kS", KEY_EOS}, {"kT", KEY_STAB}, {"kt", KEY_CTAB}, {"ku", KEY_UP} }; /* Number of TC entries .... */ static const int num_tcs = (sizeof(tc) / sizeof(struct tcdata)); int ESCDELAY = 300; /* Delay in ms between keys for esc seq's */ /* Key buffer */ #define INBUF_SZ 16 /* size of key buffer - must be larger than * longest multi-key sequence */ static wchar_t inbuf[INBUF_SZ]; static int start, end, working; /* pointers for manipulating inbuf data */ /* prototypes for private functions */ static void add_key_sequence(SCREEN *screen, char *sequence, int key_type); static key_entry_t *add_new_key(keymap_t *current, char ch, int key_type, int symbol); static void delete_key_sequence(keymap_t *current, int key_type); static void do_keyok(keymap_t *current, int key_type, bool flag, int *retval); static keymap_t *new_keymap(void); /* create a new keymap */ static key_entry_t *new_key(void); /* create a new key entry */ static wchar_t inkey(int to, int delay); /* * Free the storage associated with the given keymap */ void _cursesi_free_keymap(keymap_t *map) { int i; /* check for, and free, child keymaps */ for (i = 0; i < MAX_CHAR; i++) { if (map->mapping[i] >= 0) { if (map->key[map->mapping[i]]->type == KEYMAP_MULTI) _cursesi_free_keymap( map->key[map->mapping[i]]->value.next); } } /* now free any allocated keymap structs */ for (i = 0; i < map->count; i += KEYMAP_ALLOC_CHUNK) { free(map->key[i]); } free(map->key); free(map); } /* * Add a new key entry to the keymap pointed to by current. Entry * contains the character to add to the keymap, type is the type of * entry to add (either multikey or leaf) and symbol is the symbolic * value for a leaf type entry. The function returns a pointer to the * new keymap entry. */ static key_entry_t * add_new_key(keymap_t *current, char chr, int key_type, int symbol) { key_entry_t *the_key; int i, ki; #ifdef DEBUG __CTRACE(__CTRACE_MISC, "Adding character %s of type %d, symbol 0x%x\n", unctrl(chr), key_type, symbol); #endif if (current->mapping[(unsigned char) chr] < 0) { if (current->mapping[(unsigned char) chr] == MAPPING_UNUSED) { /* first time for this char */ current->mapping[(unsigned char) chr] = current->count; /* map new entry */ ki = current->count; /* make sure we have room in the key array first */ if ((current->count & (KEYMAP_ALLOC_CHUNK - 1)) == 0) { if ((current->key = realloc(current->key, ki * sizeof(key_entry_t *) + KEYMAP_ALLOC_CHUNK * sizeof(key_entry_t *))) == NULL) { fprintf(stderr, "Could not malloc for key entry\n"); exit(1); } the_key = new_key(); for (i = 0; i < KEYMAP_ALLOC_CHUNK; i++) { current->key[ki + i] = &the_key[i]; } } } else { /* the mapping was used but freed, reuse it */ ki = - current->mapping[(unsigned char) chr]; current->mapping[(unsigned char) chr] = ki; } current->count++; /* point at the current key array element to use */ the_key = current->key[ki]; the_key->type = key_type; switch (key_type) { case KEYMAP_MULTI: /* need for next key */ #ifdef DEBUG __CTRACE(__CTRACE_MISC, "Creating new keymap\n"); #endif the_key->value.next = new_keymap(); the_key->enable = TRUE; break; case KEYMAP_LEAF: /* the associated symbol for the key */ #ifdef DEBUG __CTRACE(__CTRACE_MISC, "Adding leaf key\n"); #endif the_key->value.symbol = symbol; the_key->enable = TRUE; break; default: fprintf(stderr, "add_new_key: bad type passed\n"); exit(1); } } else { /* the key is already known - just return the address. */ #ifdef DEBUG __CTRACE(__CTRACE_MISC, "Keymap already known\n"); #endif the_key = current->key[current->mapping[(unsigned char) chr]]; } return the_key; } /* * Delete the given key symbol from the key mappings for the screen. * */ void delete_key_sequence(keymap_t *current, int key_type) { key_entry_t *key; int i; /* * we need to iterate over all the keys as there may be * multiple instances of the leaf symbol. */ for (i = 0; i < MAX_CHAR; i++) { if (current->mapping[i] < 0) continue; /* no mapping for the key, next! */ key = current->key[current->mapping[i]]; if (key->type == KEYMAP_MULTI) { /* have not found the leaf, recurse down */ delete_key_sequence(key->value.next, key_type); /* if we deleted the last key in the map, free */ if (key->value.next->count == 0) _cursesi_free_keymap(key->value.next); } else if ((key->type == KEYMAP_LEAF) && (key->value.symbol == key_type)) { /* * delete the mapping by negating the current * index - this "holds" the position in the * allocation just in case we later re-add * the key for that mapping. */ current->mapping[i] = - current->mapping[i]; current->count--; } } } /* * Add the sequence of characters given in sequence as the key mapping * for the given key symbol. */ void add_key_sequence(SCREEN *screen, char *sequence, int key_type) { key_entry_t *tmp_key; keymap_t *current; int length, j, key_ent; #ifdef DEBUG __CTRACE(__CTRACE_MISC, "add_key_sequence: add key sequence: %s(%s)\n", sequence, keyname(key_type)); #endif /* DEBUG */ current = screen->base_keymap; /* always start with * base keymap. */ length = (int) strlen(sequence); /* * OK - we really should never get a zero length string here, either * the termcap entry is there and it has a value or we are not called * at all. Unfortunately, if someone assigns a termcap string to the * ^@ value we get passed a null string which messes up our length. * So, if we get a null string then just insert a leaf value in * the 0th char position of the root keymap. Note that we are * totally screwed if someone terminates a multichar sequence * with ^@... oh well. */ if (length == 0) length = 1; for (j = 0; j < length - 1; j++) { /* add the entry to the struct */ tmp_key = add_new_key(current, sequence[j], KEYMAP_MULTI, 0); /* index into the key array - it's clearer if we stash this */ key_ent = current->mapping[(unsigned char) sequence[j]]; current->key[key_ent] = tmp_key; /* next key uses this map... */ current = current->key[key_ent]->value.next; } /* * This is the last key in the sequence (it may have been the * only one but that does not matter) this means it is a leaf * key and should have a symbol associated with it. */ tmp_key = add_new_key(current, sequence[length - 1], KEYMAP_LEAF, key_type); current->key[current->mapping[(int)sequence[length - 1]]] = tmp_key; } /* * Init_getch - initialise all the pointers & structures needed to make * getch work in keypad mode. * */ void __init_getch(SCREEN *screen) { char entry[1024], *p; int i; size_t limit; #ifdef DEBUG int k, length; #endif /* init the inkey state variable */ state = INKEY_NORM; /* init the base keymap */ screen->base_keymap = new_keymap(); /* key input buffer pointers */ start = end = working = 0; /* now do the termcap snarfing ... */ for (i = 0; i < num_tcs; i++) { p = entry; limit = 1023; if (t_getstr(screen->cursesi_genbuf, tc[i].name, &p, &limit) != (char *) NULL) { #ifdef DEBUG __CTRACE(__CTRACE_INIT, "Processing termcap entry %s, sequence ", tc[i].name); length = (int) strlen(entry); for (k = 0; k <= length -1; k++) __CTRACE(__CTRACE_INIT, "%s", unctrl(entry[k])); __CTRACE(__CTRACE_INIT, "\n"); #endif add_key_sequence(screen, entry, tc[i].symbol); } } } /* * new_keymap - allocates & initialises a new keymap structure. This * function returns a pointer to the new keymap. * */ static keymap_t * new_keymap(void) { int i; keymap_t *new_map; if ((new_map = malloc(sizeof(keymap_t))) == NULL) { perror("Inkey: Cannot allocate new keymap"); exit(2); } /* Initialise the new map */ new_map->count = 0; for (i = 0; i < MAX_CHAR; i++) { new_map->mapping[i] = MAPPING_UNUSED; /* no mapping for char */ } /* key array will be allocated when first key is added */ new_map->key = NULL; return new_map; } /* * new_key - allocates & initialises a new key entry. This function returns * a pointer to the newly allocated key entry. * */ static key_entry_t * new_key(void) { key_entry_t *new_one; int i; if ((new_one = malloc(KEYMAP_ALLOC_CHUNK * sizeof(key_entry_t))) == NULL) { perror("inkey: Cannot allocate new key entry chunk"); exit(2); } for (i = 0; i < KEYMAP_ALLOC_CHUNK; i++) { new_one[i].type = 0; new_one[i].value.next = NULL; } return new_one; } /* * inkey - do the work to process keyboard input, check for multi-key * sequences and return the appropriate symbol if we get a match. * */ wchar_t inkey(int to, int delay) { wchar_t k; int c, mapping; keymap_t *current = _cursesi_screen->base_keymap; FILE *infd = _cursesi_screen->infd; k = 0; /* XXX gcc -Wuninitialized */ #ifdef DEBUG __CTRACE(__CTRACE_INPUT, "inkey (%d, %d)\n", to, delay); #endif for (;;) { /* loop until we get a complete key sequence */ reread: if (state == INKEY_NORM) { if (delay && __timeout(delay) == ERR) return ERR; c = getchar(); if (c == EOF) { clearerr(infd); return ERR; } if (delay && (__notimeout() == ERR)) return ERR; k = (wchar_t) c; #ifdef DEBUG __CTRACE(__CTRACE_INPUT, "inkey (state normal) got '%s'\n", unctrl(k)); #endif working = start; inbuf[working] = k; INC_POINTER(working); end = working; state = INKEY_ASSEMBLING; /* go to the assembling * state now */ } else if (state == INKEY_BACKOUT) { k = inbuf[working]; INC_POINTER(working); if (working == end) { /* see if we have run * out of keys in the * backlog */ /* if we have then switch to assembling */ state = INKEY_ASSEMBLING; } } else if (state == INKEY_ASSEMBLING) { /* assembling a key sequence */ if (delay) { if (__timeout(to ? (ESCDELAY / 100) : delay) == ERR) return ERR; } else { if (to && (__timeout(ESCDELAY / 100) == ERR)) return ERR; } c = getchar(); if (c == -1 || ferror(infd)) { clearerr(infd); return ERR; } if ((to || delay) && (__notimeout() == ERR)) return ERR; k = (wchar_t) c; #ifdef DEBUG __CTRACE(__CTRACE_INPUT, "inkey (state assembling) got '%s'\n", unctrl(k)); #endif if (feof(infd)) { /* inter-char timeout, * start backing out */ clearerr(infd); if (start == end) /* no chars in the buffer, restart */ goto reread; k = inbuf[start]; state = INKEY_TIMEOUT; } else { inbuf[working] = k; INC_POINTER(working); end = working; } } else { fprintf(stderr, "Inkey state screwed - exiting!!!"); exit(2); } /* * Check key has no special meaning and we have not * timed out and the key has not been disabled */ mapping = current->mapping[k]; if (((state == INKEY_TIMEOUT) || (mapping < 0)) || ((current->key[mapping]->type == KEYMAP_LEAF) && (current->key[mapping]->enable == FALSE))) { /* return the first key we know about */ k = inbuf[start]; INC_POINTER(start); working = start; if (start == end) { /* only one char processed */ state = INKEY_NORM; } else {/* otherwise we must have more than one char * to backout */ state = INKEY_BACKOUT; } return k; } else { /* must be part of a multikey sequence */ /* check for completed key sequence */ if (current->key[current->mapping[k]]->type == KEYMAP_LEAF) { start = working; /* eat the key sequence * in inbuf */ /* check if inbuf empty now */ if (start == end) { /* if it is go back to normal */ state = INKEY_NORM; } else { /* otherwise go to backout state */ state = INKEY_BACKOUT; } /* return the symbol */ return current->key[current->mapping[k]]->value.symbol; } else { /* * Step on to next part of the multi-key * sequence. */ current = current->key[current->mapping[k]]->value.next; } } } } #ifndef _CURSES_USE_MACROS /* * getch -- * Read in a character from stdscr. */ int getch(void) { return wgetch(stdscr); } /* * mvgetch -- * Read in a character from stdscr at the given location. */ int mvgetch(int y, int x) { return mvwgetch(stdscr, y, x); } /* * mvwgetch -- * Read in a character from stdscr at the given location in the * given window. */ int mvwgetch(WINDOW *win, int y, int x) { if (wmove(win, y, x) == ERR) return ERR; return wgetch(win); } #endif /* * keyok -- * Set the enable flag for a keysym, if the flag is false then * getch will not return this keysym even if the matching key sequence * is seen. */ int keyok(int key_type, bool flag) { int result = ERR; do_keyok(_cursesi_screen->base_keymap, key_type, flag, &result); return result; } /* * do_keyok -- * Does the actual work for keyok, we need to recurse through the * keymaps finding the passed key symbol. */ void do_keyok(keymap_t *current, int key_type, bool flag, int *retval) { key_entry_t *key; int i; /* * we need to iterate over all the keys as there may be * multiple instances of the leaf symbol. */ for (i = 0; i < MAX_CHAR; i++) { if (current->mapping[i] < 0) continue; /* no mapping for the key, next! */ key = current->key[current->mapping[i]]; if (key->type == KEYMAP_MULTI) do_keyok(key->value.next, key_type, flag, retval); else if ((key->type == KEYMAP_LEAF) && (key->value.symbol == key_type)) { key->enable = flag; *retval = OK; /* we found at least one instance, ok */ } } } /* * define_key -- * Add a custom mapping of a key sequence to key symbol. * */ int define_key(char *sequence, int symbol) { if (symbol <= 0) return ERR; if (sequence == NULL) delete_key_sequence(_cursesi_screen->base_keymap, symbol); else add_key_sequence(_cursesi_screen, sequence, symbol); return OK; } /* * wgetch -- * Read in a character from the window. */ int wgetch(WINDOW *win) { int inp, weset; int c; FILE *infd = _cursesi_screen->infd; #ifdef DEBUG __CTRACE(__CTRACE_INPUT, "wgetch: win(%p)\n", win); #endif if (!(win->flags & __SCROLLOK) && (win->flags & __FULLWIN) && win->curx == win->maxx - 1 && win->cury == win->maxy - 1 && __echoit) return (ERR); if (is_wintouched(win)) wrefresh(win); #ifdef DEBUG __CTRACE(__CTRACE_INPUT, "wgetch: __echoit = %d, " "__rawmode = %d, __nl = %d, flags = %#.4x\n", __echoit, __rawmode, _cursesi_screen->nl, win->flags); #endif if (_cursesi_screen->resized) { _cursesi_screen->resized = 0; #ifdef DEBUG __CTRACE(__CTRACE_INPUT, "wgetch returning KEY_RESIZE\n"); #endif return KEY_RESIZE; } if (_cursesi_screen->unget_pos) { #ifdef DEBUG __CTRACE(__CTRACE_INPUT, "wgetch returning char at %d\n", _cursesi_screen->unget_pos); #endif _cursesi_screen->unget_pos--; c = _cursesi_screen->unget_list[_cursesi_screen->unget_pos]; if (__echoit) waddch(win, (chtype) c); return c; } if (__echoit && !__rawmode) { cbreak(); weset = 1; } else weset = 0; __save_termios(); if (win->flags & __KEYPAD) { switch (win->delay) { case -1: inp = inkey (win->flags & __NOTIMEOUT ? 0 : 1, 0); break; case 0: if (__nodelay() == ERR) { __restore_termios(); return ERR; } inp = inkey(0, 0); break; default: inp = inkey(win->flags & __NOTIMEOUT ? 0 : 1, win->delay); break; } } else { switch (win->delay) { case -1: if (__delay() == ERR) { __restore_termios(); return ERR; } break; case 0: if (__nodelay() == ERR) { __restore_termios(); return ERR; } break; default: if (__timeout(win->delay) == ERR) { __restore_termios(); return ERR; } break; } c = getchar(); if (feof(infd)) { clearerr(infd); __restore_termios(); return ERR; /* we have timed out */ } if (ferror(infd)) { clearerr(infd); inp = ERR; } else { inp = c; } } #ifdef DEBUG if (inp > 255) /* we have a key symbol - treat it differently */ /* XXXX perhaps __unctrl should be expanded to include * XXXX the keysyms in the table.... */ __CTRACE(__CTRACE_INPUT, "wgetch assembled keysym 0x%x\n", inp); else __CTRACE(__CTRACE_INPUT, "wgetch got '%s'\n", unctrl(inp)); #endif if (win->delay > -1) { if (__delay() == ERR) { __restore_termios(); return ERR; } } __restore_termios(); if (__echoit) waddch(win, (chtype) inp); if (weset) nocbreak(); if (_cursesi_screen->nl && inp == 13) inp = 10; return ((inp < 0) || (inp == ERR) ? ERR : inp); } /* * ungetch -- * Put the character back into the input queue. */ int ungetch(int c) { return __unget((wint_t) c); } /* * __unget -- * Do the work for ungetch() and unget_wch(); */ int __unget(wint_t c) { wchar_t *p; int len; #ifdef DEBUG __CTRACE(__CTRACE_INPUT, "__unget(%x)\n", c); #endif if (_cursesi_screen->unget_pos >= _cursesi_screen->unget_len) { len = _cursesi_screen->unget_len + 32; if ((p = realloc(_cursesi_screen->unget_list, sizeof(wchar_t) * len)) == NULL) { /* Can't realloc(), so just lose the oldest entry */ memmove(_cursesi_screen->unget_list, _cursesi_screen->unget_list + sizeof(wchar_t), _cursesi_screen->unget_len - 1); _cursesi_screen->unget_list[_cursesi_screen->unget_len - 1] = c; _cursesi_screen->unget_pos = _cursesi_screen->unget_len; return OK; } else { _cursesi_screen->unget_pos = _cursesi_screen->unget_len; _cursesi_screen->unget_len = len; _cursesi_screen->unget_list = p; } } _cursesi_screen->unget_list[_cursesi_screen->unget_pos] = c; _cursesi_screen->unget_pos++; return OK; }