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diff --git a/ncurses-5.3/ncurses/tinfo/read_entry.c b/ncurses-5.3/ncurses/tinfo/read_entry.c
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+++ b/ncurses-5.3/ncurses/tinfo/read_entry.c
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+/****************************************************************************
+ * Copyright (c) 1998,1999,2000 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> *
+ ****************************************************************************/
+
+/*
+ * read_entry.c -- Routine for reading in a compiled terminfo file
+ *
+ */
+
+#include <curses.priv.h>
+
+#include <tic.h>
+#include <term_entry.h>
+
+MODULE_ID("$Id$")
+
+#if !HAVE_TELL
+#define tell(fd) 0 /* lseek() is POSIX, but not tell() - odd... */
+#endif
+
+/*
+ * int
+ * _nc_read_file_entry(filename, ptr)
+ *
+ * Read the compiled terminfo entry in the given file into the
+ * structure pointed to by ptr, allocating space for the string
+ * table.
+ */
+
+#undef BYTE
+#define BYTE(p,n) (unsigned char)((p)[n])
+
+#define IS_NEG1(p) ((BYTE(p,0) == 0377) && (BYTE(p,1) == 0377))
+#define IS_NEG2(p) ((BYTE(p,0) == 0376) && (BYTE(p,1) == 0377))
+#define LOW_MSB(p) (BYTE(p,0) + 256*BYTE(p,1))
+
+static bool have_tic_directory = FALSE;
+static bool keep_tic_directory = FALSE;
+
+/*
+ * Record the "official" location of the terminfo directory, according to
+ * the place where we're writing to, or the normal default, if not.
+ */
+NCURSES_EXPORT(const char *)
+_nc_tic_dir(const char *path)
+{
+ static const char *result = TERMINFO;
+
+ if (!keep_tic_directory) {
+ if (path != 0) {
+ result = path;
+ have_tic_directory = TRUE;
+ } else if (!have_tic_directory && use_terminfo_vars()) {
+ char *envp;
+ if ((envp = getenv("TERMINFO")) != 0)
+ return _nc_tic_dir(envp);
+ }
+ }
+ return result;
+}
+
+/*
+ * Special fix to prevent the terminfo directory from being moved after tic
+ * has chdir'd to it. If we let it be changed, then if $TERMINFO has a
+ * relative path, we'll lose track of the actual directory.
+ */
+NCURSES_EXPORT(void)
+_nc_keep_tic_dir(const char *path)
+{
+ _nc_tic_dir(path);
+ keep_tic_directory = TRUE;
+}
+
+static void
+convert_shorts(char *buf, short *Numbers, int count)
+{
+ int i;
+ for (i = 0; i < count; i++) {
+ if (IS_NEG1(buf + 2 * i))
+ Numbers[i] = ABSENT_NUMERIC;
+ else if (IS_NEG2(buf + 2 * i))
+ Numbers[i] = CANCELLED_NUMERIC;
+ else
+ Numbers[i] = LOW_MSB(buf + 2 * i);
+ TR(TRACE_DATABASE, ("get Numbers[%d]=%d", i, Numbers[i]));
+ }
+}
+
+static void
+convert_strings(char *buf, char **Strings, int count, int size, char *table)
+{
+ int i;
+ char *p;
+
+ for (i = 0; i < count; i++) {
+ if (IS_NEG1(buf + 2 * i)) {
+ Strings[i] = ABSENT_STRING;
+ } else if (IS_NEG2(buf + 2 * i)) {
+ Strings[i] = CANCELLED_STRING;
+ } else if (LOW_MSB(buf + 2 * i) > size) {
+ Strings[i] = ABSENT_STRING;
+ } else {
+ Strings[i] = (LOW_MSB(buf + 2 * i) + table);
+ TR(TRACE_DATABASE, ("Strings[%d] = %s", i, _nc_visbuf(Strings[i])));
+ }
+
+ /* make sure all strings are NUL terminated */
+ if (VALID_STRING(Strings[i])) {
+ for (p = Strings[i]; p <= table + size; p++)
+ if (*p == '\0')
+ break;
+ /* if there is no NUL, ignore the string */
+ if (p > table + size)
+ Strings[i] = ABSENT_STRING;
+ }
+ }
+}
+
+#define read_shorts(fd, buf, count) (read(fd, buf, (count)*2) == (count)*2)
+
+#define even_boundary(value) \
+ if ((value) % 2 != 0) read(fd, buf, 1)
+
+static int
+read_termtype(int fd, TERMTYPE * ptr)
+/* return 1 if read, 0 if not found or garbled */
+{
+ int name_size, bool_count, num_count, str_count, str_size;
+ int i;
+ char buf[MAX_ENTRY_SIZE];
+
+ TR(TRACE_DATABASE, ("READ termtype header @%d", tell(fd)));
+
+ memset(ptr, 0, sizeof(*ptr));
+
+ /* grab the header */
+ if (!read_shorts(fd, buf, 6)
+ || LOW_MSB(buf) != MAGIC) {
+ return (0);
+ }
+
+ _nc_free_termtype(ptr);
+ name_size = LOW_MSB(buf + 2);
+ bool_count = LOW_MSB(buf + 4);
+ num_count = LOW_MSB(buf + 6);
+ str_count = LOW_MSB(buf + 8);
+ str_size = LOW_MSB(buf + 10);
+
+ TR(TRACE_DATABASE,
+ ("TERMTYPE name_size=%d, bool=%d/%d, num=%d/%d str=%d/%d(%d)",
+ name_size, bool_count, BOOLCOUNT, num_count, NUMCOUNT,
+ str_count, STRCOUNT, str_size));
+ if (name_size < 0
+ || bool_count < 0
+ || num_count < 0
+ || str_count < 0
+ || str_size < 0) {
+ return (0);
+ }
+
+ if (str_size) {
+ /* try to allocate space for the string table */
+ if (str_count * 2 >= (int) sizeof(buf)
+ || (ptr->str_table = typeMalloc(char, (unsigned) str_size)) == 0) {
+ return (0);
+ }
+ } else {
+ str_count = 0;
+ }
+
+ /* grab the name (a null-terminate string) */
+ read(fd, buf, min(MAX_NAME_SIZE, (unsigned) name_size));
+ buf[MAX_NAME_SIZE] = '\0';
+ ptr->term_names = typeCalloc(char, strlen(buf) + 1);
+ if (ptr->term_names == NULL) {
+ return (0);
+ }
+ (void) strcpy(ptr->term_names, buf);
+ if (name_size > MAX_NAME_SIZE)
+ lseek(fd, (off_t) (name_size - MAX_NAME_SIZE), 1);
+
+ /* grab the booleans */
+ if ((ptr->Booleans = typeCalloc(char, max(BOOLCOUNT, bool_count))) == 0
+ || read(fd, ptr->Booleans, (unsigned) bool_count) < bool_count) {
+ return (0);
+ }
+
+ /*
+ * If booleans end on an odd byte, skip it. The machine they
+ * originally wrote terminfo on must have been a 16-bit
+ * word-oriented machine that would trap out if you tried a
+ * word access off a 2-byte boundary.
+ */
+ even_boundary(name_size + bool_count);
+
+ /* grab the numbers */
+ if ((ptr->Numbers = typeCalloc(short, max(NUMCOUNT, num_count))) == 0
+ || !read_shorts(fd, buf, num_count)) {
+ return (0);
+ }
+ convert_shorts(buf, ptr->Numbers, num_count);
+
+ if ((ptr->Strings = typeCalloc(char *, max(STRCOUNT, str_count))) == 0)
+ return (0);
+
+ if (str_count) {
+ /* grab the string offsets */
+ if (!read_shorts(fd, buf, str_count)) {
+ return (0);
+ }
+ /* finally, grab the string table itself */
+ if (read(fd, ptr->str_table, (unsigned) str_size) != str_size)
+ return (0);
+ convert_strings(buf, ptr->Strings, str_count, str_size, ptr->str_table);
+ }
+#if NCURSES_XNAMES
+
+ ptr->num_Booleans = BOOLCOUNT;
+ ptr->num_Numbers = NUMCOUNT;
+ ptr->num_Strings = STRCOUNT;
+
+ /*
+ * Read extended entries, if any, after the normal end of terminfo data.
+ */
+ even_boundary(str_size);
+ TR(TRACE_DATABASE, ("READ extended_header @%d", tell(fd)));
+ if (_nc_user_definable && read_shorts(fd, buf, 5)) {
+ int ext_bool_count = LOW_MSB(buf + 0);
+ int ext_num_count = LOW_MSB(buf + 2);
+ int ext_str_count = LOW_MSB(buf + 4);
+ int ext_str_size = LOW_MSB(buf + 6);
+ int ext_str_limit = LOW_MSB(buf + 8);
+ int need = (ext_bool_count + ext_num_count + ext_str_count);
+ int base = 0;
+
+ if (need >= (int) sizeof(buf)
+ || ext_str_size >= (int) sizeof(buf)
+ || ext_str_limit >= (int) sizeof(buf)
+ || ext_bool_count < 0
+ || ext_num_count < 0
+ || ext_str_count < 0
+ || ext_str_size < 0
+ || ext_str_limit < 0)
+ return (0);
+
+ ptr->num_Booleans = BOOLCOUNT + ext_bool_count;
+ ptr->num_Numbers = NUMCOUNT + ext_num_count;
+ ptr->num_Strings = STRCOUNT + ext_str_count;
+
+ ptr->Booleans = typeRealloc(char, ptr->num_Booleans, ptr->Booleans);
+ ptr->Numbers = typeRealloc(short, ptr->num_Numbers, ptr->Numbers);
+ ptr->Strings = typeRealloc(char *, ptr->num_Strings, ptr->Strings);
+
+ TR(TRACE_DATABASE, ("extended header is %d/%d/%d(%d:%d)",
+ ext_bool_count, ext_num_count, ext_str_count,
+ ext_str_size, ext_str_limit));
+
+ TR(TRACE_DATABASE, ("READ %d extended-booleans @%d",
+ ext_bool_count, tell(fd)));
+ if ((ptr->ext_Booleans = ext_bool_count) != 0) {
+ if (read(fd, ptr->Booleans + BOOLCOUNT, (unsigned)
+ ext_bool_count) != ext_bool_count)
+ return (0);
+ }
+ even_boundary(ext_bool_count);
+
+ TR(TRACE_DATABASE, ("READ %d extended-numbers @%d",
+ ext_num_count, tell(fd)));
+ if ((ptr->ext_Numbers = ext_num_count) != 0) {
+ if (!read_shorts(fd, buf, ext_num_count))
+ return (0);
+ TR(TRACE_DATABASE, ("Before converting extended-numbers"));
+ convert_shorts(buf, ptr->Numbers + NUMCOUNT, ext_num_count);
+ }
+
+ TR(TRACE_DATABASE, ("READ extended-offsets @%d", tell(fd)));
+ if ((ext_str_count || need)
+ && !read_shorts(fd, buf, ext_str_count + need))
+ return (0);
+
+ TR(TRACE_DATABASE, ("READ %d bytes of extended-strings @%d",
+ ext_str_limit, tell(fd)));
+
+ if (ext_str_limit) {
+ if ((ptr->ext_str_table = typeMalloc(char, ext_str_limit)) == 0)
+ return (0);
+ if (read(fd, ptr->ext_str_table, ext_str_limit) != ext_str_limit)
+ return (0);
+ TR(TRACE_DATABASE, ("first extended-string is %s", _nc_visbuf(ptr->ext_str_table)));
+ }
+
+ if ((ptr->ext_Strings = ext_str_count) != 0) {
+ TR(TRACE_DATABASE,
+ ("Before computing extended-string capabilities str_count=%d, ext_str_count=%d",
+ str_count, ext_str_count));
+ convert_strings(buf, ptr->Strings + str_count, ext_str_count,
+ ext_str_limit, ptr->ext_str_table);
+ for (i = ext_str_count - 1; i >= 0; i--) {
+ TR(TRACE_DATABASE, ("MOVE from [%d:%d] %s",
+ i, i + str_count,
+ _nc_visbuf(ptr->Strings[i + str_count])));
+ ptr->Strings[i + STRCOUNT] = ptr->Strings[i + str_count];
+ if (VALID_STRING(ptr->Strings[i + STRCOUNT]))
+ base += (strlen(ptr->Strings[i + STRCOUNT]) + 1);
+ TR(TRACE_DATABASE, ("... to [%d] %s",
+ i + STRCOUNT,
+ _nc_visbuf(ptr->Strings[i + STRCOUNT])));
+ }
+ }
+
+ if (need) {
+ if ((ptr->ext_Names = typeCalloc(char *, need)) == 0)
+ return (0);
+ TR(TRACE_DATABASE,
+ ("ext_NAMES starting @%d in extended_strings, first = %s",
+ base, _nc_visbuf(ptr->ext_str_table + base)));
+ convert_strings(buf + (2 * ext_str_count), ptr->ext_Names, need,
+ ext_str_limit, ptr->ext_str_table + base);
+ }
+
+ T(("...done reading terminfo bool %d(%d) num %d(%d) str %d(%d)",
+ ptr->num_Booleans, ptr->ext_Booleans,
+ ptr->num_Numbers, ptr->ext_Numbers,
+ ptr->num_Strings, ptr->ext_Strings));
+
+ TR(TRACE_DATABASE, ("extend: num_Booleans:%d", ptr->num_Booleans));
+ } else
+#endif /* NCURSES_XNAMES */
+ {
+ T(("...done reading terminfo bool %d num %d str %d",
+ bool_count, num_count, str_count));
+#if NCURSES_XNAMES
+ TR(TRACE_DATABASE, ("normal: num_Booleans:%d", ptr->num_Booleans));
+#endif
+ }
+
+ for (i = bool_count; i < BOOLCOUNT; i++)
+ ptr->Booleans[i] = FALSE;
+ for (i = num_count; i < NUMCOUNT; i++)
+ ptr->Numbers[i] = ABSENT_NUMERIC;
+ for (i = str_count; i < STRCOUNT; i++)
+ ptr->Strings[i] = ABSENT_STRING;
+
+ return (1);
+}
+
+NCURSES_EXPORT(int)
+_nc_read_file_entry
+(const char *const filename, TERMTYPE * ptr)
+/* return 1 if read, 0 if not found or garbled */
+{
+ int code, fd = -1;
+
+ if (_nc_access(filename, R_OK) < 0
+ || (fd = open(filename, O_RDONLY | O_BINARY)) < 0) {
+ T(("cannot open terminfo %s (errno=%d)", filename, errno));
+ return (0);
+ }
+
+ T(("read terminfo %s", filename));
+ if ((code = read_termtype(fd, ptr)) == 0)
+ _nc_free_termtype(ptr);
+ close(fd);
+
+ return (code);
+}
+
+/*
+ * Build a terminfo pathname and try to read the data. Returns 1 on success,
+ * 0 on failure.
+ */
+static int
+_nc_read_tic_entry(char *const filename,
+ const char *const dir, const char *ttn, TERMTYPE * const tp)
+{
+/* maximum safe length of terminfo root directory name */
+#define MAX_TPATH (PATH_MAX - MAX_ALIAS - 6)
+
+ if (strlen(dir) > MAX_TPATH)
+ return 0;
+ (void) sprintf(filename, "%s/%s", dir, ttn);
+ return _nc_read_file_entry(filename, tp);
+}
+
+/*
+ * Process the list of :-separated directories, looking for the terminal type.
+ * We don't use strtok because it does not show us empty tokens.
+ */
+static int
+_nc_read_terminfo_dirs(const char *dirs, char *const filename, const char *const
+ ttn, TERMTYPE * const tp)
+{
+ char *list, *a;
+ const char *b;
+ int code = 0;
+
+ /* we'll modify the argument, so we must copy */
+ if ((b = a = list = strdup(dirs)) == NULL)
+ return (0);
+
+ for (;;) {
+ int c = *a;
+ if (c == 0 || c == NCURSES_PATHSEP) {
+ *a = 0;
+ if ((b + 1) >= a)
+ b = TERMINFO;
+ if (_nc_read_tic_entry(filename, b, ttn, tp) == 1) {
+ code = 1;
+ break;
+ }
+ b = a + 1;
+ if (c == 0)
+ break;
+ }
+ a++;
+ }
+
+ free(list);
+ return (code);
+}
+
+/*
+ * _nc_read_entry(char *tn, char *filename, TERMTYPE *tp)
+ *
+ * Find and read the compiled entry for a given terminal type,
+ * if it exists. We take pains here to make sure no combination
+ * of environment variables and terminal type name can be used to
+ * overrun the file buffer.
+ */
+
+NCURSES_EXPORT(int)
+_nc_read_entry
+(const char *const tn, char *const filename, TERMTYPE * const tp)
+{
+ char *envp;
+ char ttn[MAX_ALIAS + 3];
+
+ /* truncate the terminal name to prevent dangerous buffer airline */
+ (void) sprintf(ttn, "%c/%.*s", *tn, MAX_ALIAS, tn);
+
+ /* This is System V behavior, in conjunction with our requirements for
+ * writing terminfo entries.
+ */
+ if (have_tic_directory
+ && _nc_read_tic_entry(filename, _nc_tic_dir(0), ttn, tp) == 1)
+ return 1;
+
+ if (use_terminfo_vars()) {
+ if ((envp = getenv("TERMINFO")) != 0
+ && _nc_read_tic_entry(filename, _nc_tic_dir(envp), ttn, tp) == 1)
+ return 1;
+
+ /* this is an ncurses extension */
+ if ((envp = _nc_home_terminfo()) != 0) {
+ if (_nc_read_tic_entry(filename, envp, ttn, tp) == 1) {
+ return (1);
+ }
+ }
+
+ /* this is an ncurses extension */
+ if ((envp = getenv("TERMINFO_DIRS")) != 0)
+ return _nc_read_terminfo_dirs(envp, filename, ttn, tp);
+ }
+
+ /* Try the system directory. Note that the TERMINFO_DIRS value, if
+ * defined by the configure script, begins with a ":", which will be
+ * interpreted as TERMINFO.
+ */
+#ifdef TERMINFO_DIRS
+ return _nc_read_terminfo_dirs(TERMINFO_DIRS, filename, ttn, tp);
+#else
+ return _nc_read_tic_entry(filename, TERMINFO, ttn, tp);
+#endif
+}
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