ncurses-5.7/ncurses/tinfo/read_entry.c - nest-learning-thermostat/5.1.7/ncurses - Git at Google

 /****************************************************************************
  * Copyright (c) 1998-2007,2008 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>                         *
  *     and: Thomas E. Dickey                        1996-on                 *
  ****************************************************************************/

 /*
  *	read_entry.c -- Routine for reading in a compiled terminfo file
  */

 #include <curses.priv.h>
 #include <hashed_db.h>

 #include <tic.h>
 #include <term_entry.h>

 MODULE_ID("$Id: read_entry.c,v 1.102 2008/08/03 19:33:04 tom Exp $")

 #define TYPE_CALLOC(type,elts) typeCalloc(type, (unsigned)(elts))

 #if USE_DATABASE
 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 ((int) 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;
 	}
     }
 }

 static int
 fake_read(char *src, int *offset, int limit, char *dst, unsigned want)
 {
     int have = (limit - *offset);

     if (have > 0) {
 	if ((int) want > have)
 	    want = have;
 	memcpy(dst, src + *offset, want);
 	*offset += want;
     } else {
 	want = 0;
     }
     return (int) want;
 }

 #define Read(buf, count) fake_read(buffer, &offset, limit, buf, count)

 #define read_shorts(buf, count) \
 	(Read(buf, (unsigned) (count)*2) == (int) (count)*2)

 #define even_boundary(value) \
     if ((value) % 2 != 0) Read(buf, 1)

 NCURSES_EXPORT(int)
 _nc_read_termtype(TERMTYPE *ptr, char *buffer, int limit)
 /* return 1 if read, 0 if not found or garbled */
 {
     int offset = 0;
     int name_size, bool_count, num_count, str_count, str_size;
     int i;
     char buf[MAX_ENTRY_SIZE + 1];
     char *string_table;
     unsigned want, have;

     TR(TRACE_DATABASE, ("READ termtype header @%d", offset));

     memset(ptr, 0, sizeof(*ptr));

     /* grab the header */
     if (!read_shorts(buf, 6)
 	|| !IS_TIC_MAGIC(buf)) {
 	return (TGETENT_NO);
     }

     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 (TGETENT_NO);
     }

     want = str_size + name_size + 1;
     if (str_size) {
 	/* try to allocate space for the string table */
 	if (str_count * 2 >= (int) sizeof(buf)
 	    || (string_table = typeMalloc(char, want)) == 0) {
 	    return (TGETENT_NO);
 	}
     } else {
 	str_count = 0;
 	if ((string_table = typeMalloc(char, want)) == 0) {
 	    return (TGETENT_NO);
 	}
     }

     /* grab the name (a null-terminated string) */
     want = min(MAX_NAME_SIZE, (unsigned) name_size);
     ptr->str_table = string_table;
     ptr->term_names = string_table;
     if ((have = Read(ptr->term_names, want)) != want) {
 	memset(ptr->term_names + have, 0, want - have);
     }
     ptr->term_names[want] = '\0';
     string_table += (want + 1);

     if (have > MAX_NAME_SIZE)
 	offset = (have - MAX_NAME_SIZE);

     /* grab the booleans */
     if ((ptr->Booleans = TYPE_CALLOC(NCURSES_SBOOL,
 				     max(BOOLCOUNT, bool_count))) == 0
 	|| Read(ptr->Booleans, (unsigned) bool_count) < bool_count) {
 	return (TGETENT_NO);
     }

     /*
      * 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 = TYPE_CALLOC(short, max(NUMCOUNT, num_count))) == 0
 	|| !read_shorts(buf, num_count)) {
 	return (TGETENT_NO);
     }
     convert_shorts(buf, ptr->Numbers, num_count);

     if ((ptr->Strings = TYPE_CALLOC(char *, max(STRCOUNT, str_count))) == 0)
 	  return (TGETENT_NO);

     if (str_count) {
 	/* grab the string offsets */
 	if (!read_shorts(buf, str_count)) {
 	    return (TGETENT_NO);
 	}
 	/* finally, grab the string table itself */
 	if (Read(string_table, (unsigned) str_size) != str_size)
 	    return (TGETENT_NO);
 	convert_strings(buf, ptr->Strings, str_count, str_size, string_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", offset));
     if (_nc_user_definable && read_shorts(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);
 	unsigned need = (ext_bool_count + ext_num_count + ext_str_count);
 	int base = 0;

 	if (need >= 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 (TGETENT_NO);

 	ptr->num_Booleans = BOOLCOUNT + ext_bool_count;
 	ptr->num_Numbers = NUMCOUNT + ext_num_count;
 	ptr->num_Strings = STRCOUNT + ext_str_count;

 	ptr->Booleans = typeRealloc(NCURSES_SBOOL, 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, offset));
 	if ((ptr->ext_Booleans = ext_bool_count) != 0) {
 	    if (Read(ptr->Booleans + BOOLCOUNT, (unsigned)
 		     ext_bool_count) != ext_bool_count)
 		return (TGETENT_NO);
 	}
 	even_boundary(ext_bool_count);

 	TR(TRACE_DATABASE, ("READ %d extended-numbers @%d",
 			    ext_num_count, offset));
 	if ((ptr->ext_Numbers = ext_num_count) != 0) {
 	    if (!read_shorts(buf, ext_num_count))
 		return (TGETENT_NO);
 	    TR(TRACE_DATABASE, ("Before converting extended-numbers"));
 	    convert_shorts(buf, ptr->Numbers + NUMCOUNT, ext_num_count);
 	}

 	TR(TRACE_DATABASE, ("READ extended-offsets @%d", offset));
 	if ((ext_str_count || need)
 	    && !read_shorts(buf, ext_str_count + need))
 	    return (TGETENT_NO);

 	TR(TRACE_DATABASE, ("READ %d bytes of extended-strings @%d",
 			    ext_str_limit, offset));

 	if (ext_str_limit) {
 	    if ((ptr->ext_str_table = typeMalloc(char, ext_str_limit)) == 0)
 		  return (TGETENT_NO);
 	    if (Read(ptr->ext_str_table, (unsigned) ext_str_limit) != ext_str_limit)
 		return (TGETENT_NO);
 	    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 (ext_str_count >= (MAX_ENTRY_SIZE * 2))
 		  return (TGETENT_NO);
 	    if ((ptr->ext_Names = TYPE_CALLOC(char *, need)) == 0)
 		  return (TGETENT_NO);
 	    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,
 			    (int) 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 (TGETENT_YES);
 }

 /*
  *	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.
  */
 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;
     int limit;
     char buffer[MAX_ENTRY_SIZE + 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));
 	code = TGETENT_NO;
     } else {
 	if ((limit = read(fd, buffer, sizeof(buffer))) > 0) {

 	    T(("read terminfo %s", filename));
 	    if ((code = _nc_read_termtype(ptr, buffer, limit)) == TGETENT_NO) {
 		_nc_free_termtype(ptr);
 	    }
 	} else {
 	    code = TGETENT_NO;
 	}
 	close(fd);
     }

     return (code);
 }

 /*
  * Build a terminfo pathname and try to read the data.  Returns TGETENT_YES on
  * success, TGETENT_NO on failure.
  */
 static int
 _nc_read_tic_entry(char *filename,
 		   unsigned limit,
 		   const char *const path,
 		   const char *name,
 		   TERMTYPE *const tp)
 {
     int result = TGETENT_NO;

     /*
      * If we are looking in a directory, assume the entry is a file under that,
      * according to the normal rules.
      *
      * FIXME - add caseless-filename fixup.
      */
     if (_nc_is_dir_path(path)) {
 	unsigned need = 4 + strlen(path) + strlen(name);

 	if (need <= limit) {
 	    (void) sprintf(filename, "%s/" LEAF_FMT "/%s", path, *name, name);
 	    result = _nc_read_file_entry(filename, tp);
 	}
     }
 #if USE_HASHED_DB
     else {
 	static const char suffix[] = DBM_SUFFIX;
 	DB *capdbp;
 	unsigned lens = sizeof(suffix) - 1;
 	unsigned size = strlen(path);
 	unsigned need = lens + size;

 	if (need <= limit) {
 	    if (size >= lens
 		&& !strcmp(path + size - lens, suffix))
 		(void) strcpy(filename, path);
 	    else
 		(void) sprintf(filename, "%s%s", path, suffix);

 	    /*
 	     * It would be nice to optimize the dbopen/close activity, as
 	     * done in the cgetent implementation for tc= clauses.  However,
 	     * since we support multiple database locations, we cannot do
 	     * that.
 	     */
 	    if ((capdbp = _nc_db_open(filename, FALSE)) != 0) {
 		DBT key, data;
 		int reccnt = 0;
 		char *save = strdup(name);

 		memset(&key, 0, sizeof(key));
 		key.data = save;
 		key.size = strlen(save);

 		/*
 		 * This lookup could return termcap data, which we do not want.
 		 * We are looking for compiled (binary) terminfo data.
 		 *
 		 * cgetent uses a two-level lookup.  On the first it uses the
 		 * given name to return a record containing only the aliases
 		 * for an entry.  On the second (using that list of aliases as
 		 * a key), it returns the content of the terminal description.
 		 * We expect second lookup to return data beginning with the
 		 * same set of aliases.
 		 *
 		 * For compiled terminfo, the list of aliases in the second
 		 * case will be null-terminated.  A termcap entry will not be,
 		 * and will run on into the description.  So we can easily
 		 * distinguish between the two (source/binary) by checking the
 		 * lengths.
 		 */
 		while (_nc_db_get(capdbp, &key, &data) == 0) {
 		    int used = data.size - 1;
 		    char *have = (char *) data.data;

 		    if (*have++ == 0) {
 			if (data.size > key.size
 			    && IS_TIC_MAGIC(have)) {
 			    result = _nc_read_termtype(tp, have, used);
 			    if (result == TGETENT_NO) {
 				_nc_free_termtype(tp);
 			    }
 			}
 			break;
 		    }

 		    /*
 		     * Just in case we have a corrupt database, do not waste
 		     * time with it.
 		     */
 		    if (++reccnt >= 3)
 			break;

 		    /*
 		     * Prepare for the second level.
 		     */
 		    key.data = have;
 		    key.size = used;
 		}

 		_nc_db_close(capdbp);
 		free(save);
 	    }
 	}
     }
 #endif
     return result;
 }
 #endif /* USE_DATABASE */

 /*
  *	_nc_read_entry(char *name, 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 name, char *const filename, TERMTYPE *const tp)
 {
     int code = TGETENT_NO;

     if (strlen(name) == 0
 	|| strcmp(name, ".") == 0
 	|| strcmp(name, "..") == 0
 	|| _nc_pathlast(name) != 0
 	|| strchr(name, NCURSES_PATHSEP) != 0) {
 	T(("illegal or missing entry name '%s'", name));
     } else {
 #if USE_DATABASE
 	DBDIRS state = dbdTIC;
 	int offset = 0;
 	const char *path;

 	while ((path = _nc_next_db(&state, &offset)) != 0) {
 	    code = _nc_read_tic_entry(filename, PATH_MAX, path, name, tp);
 	    if (code == TGETENT_YES) {
 		_nc_last_db();
 		break;
 	    }
 	}
 #endif
 #if USE_TERMCAP
 	if (code != TGETENT_YES) {
 	    code = _nc_read_termcap_entry(name, tp);
 	    sprintf(filename, "%.*s", PATH_MAX - 1, _nc_get_source());
 	}
 #endif
     }
     return code;
 }
	/****************************************************************************
	* Copyright (c) 1998-2007,2008 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> *
	* and: Thomas E. Dickey 1996-on *
	****************************************************************************/

	/*
	* read_entry.c -- Routine for reading in a compiled terminfo file
	*/

	#include <curses.priv.h>
	#include <hashed_db.h>

	#include <tic.h>
	#include <term_entry.h>

	MODULE_ID("$Id: read_entry.c,v 1.102 2008/08/03 19:33:04 tom Exp $")

	#define TYPE_CALLOC(type,elts) typeCalloc(type, (unsigned)(elts))

	#if USE_DATABASE
	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 ((int) 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;
	}
	}
	}

	static int
	fake_read(char src, int offset, int limit, char *dst, unsigned want)
	{
	int have = (limit - *offset);

	if (have > 0) {
	if ((int) want > have)
	want = have;
	memcpy(dst, src + *offset, want);
	*offset += want;
	} else {
	want = 0;
	}
	return (int) want;
	}

	#define Read(buf, count) fake_read(buffer, &offset, limit, buf, count)

	#define read_shorts(buf, count) \
	(Read(buf, (unsigned) (count)2) == (int) (count)2)

	#define even_boundary(value) \
	if ((value) % 2 != 0) Read(buf, 1)

	NCURSES_EXPORT(int)
	_nc_read_termtype(TERMTYPE ptr, char buffer, int limit)
	/* return 1 if read, 0 if not found or garbled */
	{
	int offset = 0;
	int name_size, bool_count, num_count, str_count, str_size;
	int i;
	char buf[MAX_ENTRY_SIZE + 1];
	char *string_table;
	unsigned want, have;

	TR(TRACE_DATABASE, ("READ termtype header @%d", offset));

	memset(ptr, 0, sizeof(*ptr));

	/* grab the header */
	if (!read_shorts(buf, 6)
	\|\| !IS_TIC_MAGIC(buf)) {
	return (TGETENT_NO);
	}

	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 (TGETENT_NO);
	}

	want = str_size + name_size + 1;
	if (str_size) {
	/* try to allocate space for the string table */
	if (str_count * 2 >= (int) sizeof(buf)
	\|\| (string_table = typeMalloc(char, want)) == 0) {
	return (TGETENT_NO);
	}
	} else {
	str_count = 0;
	if ((string_table = typeMalloc(char, want)) == 0) {
	return (TGETENT_NO);
	}
	}

	/* grab the name (a null-terminated string) */
	want = min(MAX_NAME_SIZE, (unsigned) name_size);
	ptr->str_table = string_table;
	ptr->term_names = string_table;
	if ((have = Read(ptr->term_names, want)) != want) {
	memset(ptr->term_names + have, 0, want - have);
	}
	ptr->term_names[want] = '\0';
	string_table += (want + 1);

	if (have > MAX_NAME_SIZE)
	offset = (have - MAX_NAME_SIZE);

	/* grab the booleans */
	if ((ptr->Booleans = TYPE_CALLOC(NCURSES_SBOOL,
	max(BOOLCOUNT, bool_count))) == 0
	\|\| Read(ptr->Booleans, (unsigned) bool_count) < bool_count) {
	return (TGETENT_NO);
	}

	/*
	* 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 = TYPE_CALLOC(short, max(NUMCOUNT, num_count))) == 0
	\|\| !read_shorts(buf, num_count)) {
	return (TGETENT_NO);
	}
	convert_shorts(buf, ptr->Numbers, num_count);

	if ((ptr->Strings = TYPE_CALLOC(char *, max(STRCOUNT, str_count))) == 0)
	return (TGETENT_NO);

	if (str_count) {
	/* grab the string offsets */
	if (!read_shorts(buf, str_count)) {
	return (TGETENT_NO);
	}
	/* finally, grab the string table itself */
	if (Read(string_table, (unsigned) str_size) != str_size)
	return (TGETENT_NO);
	convert_strings(buf, ptr->Strings, str_count, str_size, string_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", offset));
	if (_nc_user_definable && read_shorts(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);
	unsigned need = (ext_bool_count + ext_num_count + ext_str_count);
	int base = 0;

	if (need >= 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 (TGETENT_NO);

	ptr->num_Booleans = BOOLCOUNT + ext_bool_count;
	ptr->num_Numbers = NUMCOUNT + ext_num_count;
	ptr->num_Strings = STRCOUNT + ext_str_count;

	ptr->Booleans = typeRealloc(NCURSES_SBOOL, 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, offset));
	if ((ptr->ext_Booleans = ext_bool_count) != 0) {
	if (Read(ptr->Booleans + BOOLCOUNT, (unsigned)
	ext_bool_count) != ext_bool_count)
	return (TGETENT_NO);
	}
	even_boundary(ext_bool_count);

	TR(TRACE_DATABASE, ("READ %d extended-numbers @%d",
	ext_num_count, offset));
	if ((ptr->ext_Numbers = ext_num_count) != 0) {
	if (!read_shorts(buf, ext_num_count))
	return (TGETENT_NO);
	TR(TRACE_DATABASE, ("Before converting extended-numbers"));
	convert_shorts(buf, ptr->Numbers + NUMCOUNT, ext_num_count);
	}

	TR(TRACE_DATABASE, ("READ extended-offsets @%d", offset));
	if ((ext_str_count \|\| need)
	&& !read_shorts(buf, ext_str_count + need))
	return (TGETENT_NO);

	TR(TRACE_DATABASE, ("READ %d bytes of extended-strings @%d",
	ext_str_limit, offset));

	if (ext_str_limit) {
	if ((ptr->ext_str_table = typeMalloc(char, ext_str_limit)) == 0)
	return (TGETENT_NO);
	if (Read(ptr->ext_str_table, (unsigned) ext_str_limit) != ext_str_limit)
	return (TGETENT_NO);
	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 (ext_str_count >= (MAX_ENTRY_SIZE * 2))
	return (TGETENT_NO);
	if ((ptr->ext_Names = TYPE_CALLOC(char *, need)) == 0)
	return (TGETENT_NO);
	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,
	(int) 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 (TGETENT_YES);
	}

	/*
	* 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.
	*/
	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;
	int limit;
	char buffer[MAX_ENTRY_SIZE + 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));
	code = TGETENT_NO;
	} else {
	if ((limit = read(fd, buffer, sizeof(buffer))) > 0) {

	T(("read terminfo %s", filename));
	if ((code = _nc_read_termtype(ptr, buffer, limit)) == TGETENT_NO) {
	_nc_free_termtype(ptr);
	}
	} else {
	code = TGETENT_NO;
	}
	close(fd);
	}

	return (code);
	}

	/*
	* Build a terminfo pathname and try to read the data. Returns TGETENT_YES on
	* success, TGETENT_NO on failure.
	*/
	static int
	_nc_read_tic_entry(char *filename,
	unsigned limit,
	const char *const path,
	const char *name,
	TERMTYPE *const tp)
	{
	int result = TGETENT_NO;

	/*
	* If we are looking in a directory, assume the entry is a file under that,
	* according to the normal rules.
	*
	* FIXME - add caseless-filename fixup.
	*/
	if (_nc_is_dir_path(path)) {
	unsigned need = 4 + strlen(path) + strlen(name);

	if (need <= limit) {
	(void) sprintf(filename, "%s/" LEAF_FMT "/%s", path, *name, name);
	result = _nc_read_file_entry(filename, tp);
	}
	}
	#if USE_HASHED_DB
	else {
	static const char suffix[] = DBM_SUFFIX;
	DB *capdbp;
	unsigned lens = sizeof(suffix) - 1;
	unsigned size = strlen(path);
	unsigned need = lens + size;

	if (need <= limit) {
	if (size >= lens
	&& !strcmp(path + size - lens, suffix))
	(void) strcpy(filename, path);
	else
	(void) sprintf(filename, "%s%s", path, suffix);

	/*
	* It would be nice to optimize the dbopen/close activity, as
	* done in the cgetent implementation for tc= clauses. However,
	* since we support multiple database locations, we cannot do
	* that.
	*/
	if ((capdbp = _nc_db_open(filename, FALSE)) != 0) {
	DBT key, data;
	int reccnt = 0;
	char *save = strdup(name);

	memset(&key, 0, sizeof(key));
	key.data = save;
	key.size = strlen(save);

	/*
	* This lookup could return termcap data, which we do not want.
	* We are looking for compiled (binary) terminfo data.
	*
	* cgetent uses a two-level lookup. On the first it uses the
	* given name to return a record containing only the aliases
	* for an entry. On the second (using that list of aliases as
	* a key), it returns the content of the terminal description.
	* We expect second lookup to return data beginning with the
	* same set of aliases.
	*
	* For compiled terminfo, the list of aliases in the second
	* case will be null-terminated. A termcap entry will not be,
	* and will run on into the description. So we can easily
	* distinguish between the two (source/binary) by checking the
	* lengths.
	*/
	while (_nc_db_get(capdbp, &key, &data) == 0) {
	int used = data.size - 1;
	char have = (char ) data.data;

	if (*have++ == 0) {
	if (data.size > key.size
	&& IS_TIC_MAGIC(have)) {
	result = _nc_read_termtype(tp, have, used);
	if (result == TGETENT_NO) {
	_nc_free_termtype(tp);
	}
	}
	break;
	}

	/*
	* Just in case we have a corrupt database, do not waste
	* time with it.
	*/
	if (++reccnt >= 3)
	break;

	/*
	* Prepare for the second level.
	*/
	key.data = have;
	key.size = used;
	}

	_nc_db_close(capdbp);
	free(save);
	}
	}
	}
	#endif
	return result;
	}
	#endif /* USE_DATABASE */

	/*
	* _nc_read_entry(char name, 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 name, char const filename, TERMTYPE *const tp)
	{
	int code = TGETENT_NO;

	if (strlen(name) == 0
	\|\| strcmp(name, ".") == 0
	\|\| strcmp(name, "..") == 0
	\|\| _nc_pathlast(name) != 0
	\|\| strchr(name, NCURSES_PATHSEP) != 0) {
	T(("illegal or missing entry name '%s'", name));
	} else {
	#if USE_DATABASE
	DBDIRS state = dbdTIC;
	int offset = 0;
	const char *path;

	while ((path = _nc_next_db(&state, &offset)) != 0) {
	code = _nc_read_tic_entry(filename, PATH_MAX, path, name, tp);
	if (code == TGETENT_YES) {
	_nc_last_db();
	break;
	}
	}
	#endif
	#if USE_TERMCAP
	if (code != TGETENT_YES) {
	code = _nc_read_termcap_entry(name, tp);
	sprintf(filename, "%.*s", PATH_MAX - 1, _nc_get_source());
	}
	#endif
	}
	return code;
	}