Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcurses/tinfo/read_entry.c	Lines:	143	168	85.1 %
Date:	2017-11-13	Branches:	86	148	58.1 %


/* $OpenBSD: read_entry.c,v 1.17 2015/12/03 11:29:55 nicm Exp $ */

/****************************************************************************
 * 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 1.17 2015/12/03 11:29:55 nicm 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.
     */
    unsigned need = 4 + strlen(path) + strlen(name);
    if (need <= limit) {
	    (void) snprintf(filename, limit, "%s/" LEAF_FMT "/%s", path, *name, name);
	    if (_nc_is_dir_path(path))
		    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) strlcpy(filename, path, limit);
	    else
		(void) snprintf(filename, limit, "%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;

    snprintf(filename, PATH_MAX, "%s", name);
    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);
	    snprintf(filename, PATH_MAX, "%s", _nc_get_source());
	}
#endif
    }
    return code;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: read_entry.c,v 1.17 2015/12/03 11:29:55 nicm Exp $ */
2
3			/****************************************************************************
4			* Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. *
5			* *
6			* Permission is hereby granted, free of charge, to any person obtaining a *
7			* copy of this software and associated documentation files (the *
8			* "Software"), to deal in the Software without restriction, including *
9			* without limitation the rights to use, copy, modify, merge, publish, *
10			* distribute, distribute with modifications, sublicense, and/or sell *
11			* copies of the Software, and to permit persons to whom the Software is *
12			* furnished to do so, subject to the following conditions: *
13			* *
14			* The above copyright notice and this permission notice shall be included *
15			* in all copies or substantial portions of the Software. *
16			* *
17			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
18			* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
19			* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
20			* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
21			* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
22			* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
23			* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
24			* *
25			* Except as contained in this notice, the name(s) of the above copyright *
26			* holders shall not be used in advertising or otherwise to promote the *
27			* sale, use or other dealings in this Software without prior written *
28			* authorization. *
29			****************************************************************************/
30
31			/****************************************************************************
32			* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
33			* and: Eric S. Raymond <esr@snark.thyrsus.com> *
34			* and: Thomas E. Dickey 1996-on *
35			****************************************************************************/
36
37			/*
38			* read_entry.c -- Routine for reading in a compiled terminfo file
39			*/
40
41			#include <curses.priv.h>
42			#include <hashed_db.h>
43
44			#include <tic.h>
45			#include <term_entry.h>
46
47			MODULE_ID("$Id: read_entry.c,v 1.17 2015/12/03 11:29:55 nicm Exp $")
48
49			#define TYPE_CALLOC(type,elts) typeCalloc(type, (unsigned)(elts))
50
51			#if USE_DATABASE
52			static void
53			convert_shorts(char buf, short Numbers, int count)
54			{
55			int i;
56	✓✓	120	for (i = 0; i < count; i++) {
57	✓✓✓✗	81	if (IS_NEG1(buf + 2 * i))
58		30	Numbers[i] = ABSENT_NUMERIC;
59	✓✓✓✗	24	else if (IS_NEG2(buf + 2 * i))
60		3	Numbers[i] = CANCELLED_NUMERIC;
61			else
62		18	Numbers[i] = LOW_MSB(buf + 2 * i);
63			TR(TRACE_DATABASE, ("get Numbers[%d]=%d", i, Numbers[i]));
64			}
65		6	}
66
67			static void
68			convert_strings(char buf, char Strings, int count, int size, char table)
69			{
70			int i;
71			char *p;
72
73	✓✓	2301	for (i = 0; i < count; i++) {
74	✓✓✓✗	1974	if (IS_NEG1(buf + 2 * i)) {
75			Strings[i] = ABSENT_STRING;
76	✗✓✗✗	1137	} else if (IS_NEG2(buf + 2 * i)) {
77			Strings[i] = CANCELLED_STRING;
78	✗✓	300	} else if ((int) LOW_MSB(buf + 2 * i) > size) {
79			Strings[i] = ABSENT_STRING;
80			} else {
81		300	Strings[i] = (LOW_MSB(buf + 2 * i) + table);
82			TR(TRACE_DATABASE, ("Strings[%d] = %s", i, _nc_visbuf(Strings[i])));
83			}
84
85			/* make sure all strings are NUL terminated */
86	✓✗✓✓	2274	if (VALID_STRING(Strings[i])) {
87	✓✗	4098	for (p = Strings[i]; p <= table + size; p++)
88	✓✓	2049	if (*p == '\0')
89			break;
90			/* if there is no NUL, ignore the string */
91	✗✓	300	if (p > table + size)
92			Strings[i] = ABSENT_STRING;
93			}
94			}
95		9	}
96
97			static int
98			fake_read(char src, int offset, int limit, char *dst, unsigned want)
99			{
100		78	int have = (limit - *offset);
101
102	✓✗	39	if (have > 0) {
103	✗✓	39	if ((int) want > have)
104			want = have;
105		39	memcpy(dst, src + *offset, want);
106		39	*offset += want;
107		39	} else {
108			want = 0;
109			}
110		39	return (int) want;
111			}
112
113			#define Read(buf, count) fake_read(buffer, &offset, limit, buf, count)
114
115			#define read_shorts(buf, count) \
116			(Read(buf, (unsigned) (count)2) == (int) (count)2)
117
118			#define even_boundary(value) \
119			if ((value) % 2 != 0) Read(buf, 1)
120
121			NCURSES_EXPORT(int)
122			_nc_read_termtype(TERMTYPE ptr, char buffer, int limit)
123			/* return 1 if read, 0 if not found or garbled */
124			{
125		6	int offset = 0;
126			int name_size, bool_count, num_count, str_count, str_size;
127			int i;
128		3	char buf[MAX_ENTRY_SIZE + 1];
129			char *string_table;
130			unsigned want, have;
131
132			TR(TRACE_DATABASE, ("READ termtype header @%d", offset));
133
134		3	memset(ptr, 0, sizeof(*ptr));
135
136			/* grab the header */
137	✗✓	6	if (!read_shorts(buf, 6)
138	✓✗	6	\|\| !IS_TIC_MAGIC(buf)) {
139			return (TGETENT_NO);
140			}
141
142		3	name_size = LOW_MSB(buf + 2);
143		3	bool_count = LOW_MSB(buf + 4);
144		3	num_count = LOW_MSB(buf + 6);
145		3	str_count = LOW_MSB(buf + 8);
146		3	str_size = LOW_MSB(buf + 10);
147
148			TR(TRACE_DATABASE,
149			("TERMTYPE name_size=%d, bool=%d/%d, num=%d/%d str=%d/%d(%d)",
150			name_size, bool_count, BOOLCOUNT, num_count, NUMCOUNT,
151			str_count, STRCOUNT, str_size));
152			if (name_size < 0
153	✗✓	3	\|\| bool_count < 0
154			\|\| num_count < 0
155			\|\| str_count < 0
156			\|\| str_size < 0) {
157			return (TGETENT_NO);
158			}
159
160		3	want = str_size + name_size + 1;
161	✓✗	3	if (str_size) {
162			/* try to allocate space for the string table */
163	✗✓	6	if (str_count * 2 >= (int) sizeof(buf)
164	✓✗	6	\|\| (string_table = typeMalloc(char, want)) == 0) {
165			return (TGETENT_NO);
166			}
167			} else {
168			str_count = 0;
169			if ((string_table = typeMalloc(char, want)) == 0) {
170			return (TGETENT_NO);
171			}
172			}
173
174			/* grab the name (a null-terminated string) */
175		3	want = min(MAX_NAME_SIZE, (unsigned) name_size);
176		3	ptr->str_table = string_table;
177		3	ptr->term_names = string_table;
178	✗✓	3	if ((have = Read(ptr->term_names, want)) != want) {
179			memset(ptr->term_names + have, 0, want - have);
180			}
181		3	ptr->term_names[want] = '\0';
182		3	string_table += (want + 1);
183
184	✗✓	3	if (have > MAX_NAME_SIZE)
185			offset = (have - MAX_NAME_SIZE);
186
187			/* grab the booleans */
188	✗✓	6	if ((ptr->Booleans = TYPE_CALLOC(NCURSES_SBOOL,
189		3	max(BOOLCOUNT, bool_count))) == 0
190	✓✗	6	\|\| Read(ptr->Booleans, (unsigned) bool_count) < bool_count) {
191			return (TGETENT_NO);
192			}
193
194			/*
195			* If booleans end on an odd byte, skip it. The machine they
196			* originally wrote terminfo on must have been a 16-bit
197			* word-oriented machine that would trap out if you tried a
198			* word access off a 2-byte boundary.
199			*/
200	✓✗	6	even_boundary(name_size + bool_count);
201
202			/* grab the numbers */
203	✗✓	6	if ((ptr->Numbers = TYPE_CALLOC(short, max(NUMCOUNT, num_count))) == 0
204	✓✗	6	\|\| !read_shorts(buf, num_count)) {
205			return (TGETENT_NO);
206			}
207		3	convert_shorts(buf, ptr->Numbers, num_count);
208
209	✗✓	3	if ((ptr->Strings = TYPE_CALLOC(char *, max(STRCOUNT, str_count))) == 0)
210			return (TGETENT_NO);
211
212	✓✗	3	if (str_count) {
213			/* grab the string offsets */
214	✗✓	3	if (!read_shorts(buf, str_count)) {
215			return (TGETENT_NO);
216			}
217			/* finally, grab the string table itself */
218	✗✓	3	if (Read(string_table, (unsigned) str_size) != str_size)
219			return (TGETENT_NO);
220		3	convert_strings(buf, ptr->Strings, str_count, str_size, string_table);
221		3	}
222			#if NCURSES_XNAMES
223
224		3	ptr->num_Booleans = BOOLCOUNT;
225		3	ptr->num_Numbers = NUMCOUNT;
226		3	ptr->num_Strings = STRCOUNT;
227
228			/*
229			* Read extended entries, if any, after the normal end of terminfo data.
230			*/
231	✗✓	3	even_boundary(str_size);
232			TR(TRACE_DATABASE, ("READ extended_header @%d", offset));
233	✓✗✓✗	6	if (_nc_user_definable && read_shorts(buf, 5)) {
234		3	int ext_bool_count = LOW_MSB(buf + 0);
235		3	int ext_num_count = LOW_MSB(buf + 2);
236		3	int ext_str_count = LOW_MSB(buf + 4);
237		3	int ext_str_size = LOW_MSB(buf + 6);
238		3	int ext_str_limit = LOW_MSB(buf + 8);
239		3	unsigned need = (ext_bool_count + ext_num_count + ext_str_count);
240			int base = 0;
241
242		3	if (need >= sizeof(buf)
243	✗✓	6	\|\| ext_str_size >= (int) sizeof(buf)
244		3	\|\| ext_str_limit >= (int) sizeof(buf)
245			\|\| ext_bool_count < 0
246			\|\| ext_num_count < 0
247			\|\| ext_str_count < 0
248			\|\| ext_str_size < 0
249			\|\| ext_str_limit < 0)
250			return (TGETENT_NO);
251
252		3	ptr->num_Booleans = BOOLCOUNT + ext_bool_count;
253		3	ptr->num_Numbers = NUMCOUNT + ext_num_count;
254		3	ptr->num_Strings = STRCOUNT + ext_str_count;
255
256		3	ptr->Booleans = typeRealloc(NCURSES_SBOOL, ptr->num_Booleans, ptr->Booleans);
257		3	ptr->Numbers = typeRealloc(short, ptr->num_Numbers, ptr->Numbers);
258		3	ptr->Strings = typeRealloc(char *, ptr->num_Strings, ptr->Strings);
259
260			TR(TRACE_DATABASE, ("extended header is %d/%d/%d(%d:%d)",
261			ext_bool_count, ext_num_count, ext_str_count,
262			ext_str_size, ext_str_limit));
263
264			TR(TRACE_DATABASE, ("READ %d extended-booleans @%d",
265			ext_bool_count, offset));
266	✓✗	3	if ((ptr->ext_Booleans = ext_bool_count) != 0) {
267	✗✓	6	if (Read(ptr->Booleans + BOOLCOUNT, (unsigned)
268		3	ext_bool_count) != ext_bool_count)
269			return (TGETENT_NO);
270			}
271	✓✗	6	even_boundary(ext_bool_count);
272
273			TR(TRACE_DATABASE, ("READ %d extended-numbers @%d",
274			ext_num_count, offset));
275	✓✗	3	if ((ptr->ext_Numbers = ext_num_count) != 0) {
276	✗✓	3	if (!read_shorts(buf, ext_num_count))
277			return (TGETENT_NO);
278			TR(TRACE_DATABASE, ("Before converting extended-numbers"));
279		3	convert_shorts(buf, ptr->Numbers + NUMCOUNT, ext_num_count);
280		3	}
281
282			TR(TRACE_DATABASE, ("READ extended-offsets @%d", offset));
283	✓✗✗✓	6	if ((ext_str_count \|\| need)
284		3	&& !read_shorts(buf, ext_str_count + need))
285			return (TGETENT_NO);
286
287			TR(TRACE_DATABASE, ("READ %d bytes of extended-strings @%d",
288			ext_str_limit, offset));
289
290	✓✗	3	if (ext_str_limit) {
291	✗✓	3	if ((ptr->ext_str_table = typeMalloc(char, ext_str_limit)) == 0)
292			return (TGETENT_NO);
293	✗✓	3	if (Read(ptr->ext_str_table, (unsigned) ext_str_limit) != ext_str_limit)
294			return (TGETENT_NO);
295			TR(TRACE_DATABASE, ("first extended-string is %s", _nc_visbuf(ptr->ext_str_table)));
296			}
297
298	✓✗	3	if ((ptr->ext_Strings = ext_str_count) != 0) {
299			TR(TRACE_DATABASE,
300			("Before computing extended-string capabilities str_count=%d, ext_str_count=%d",
301			str_count, ext_str_count));
302		6	convert_strings(buf, ptr->Strings + str_count, ext_str_count,
303		3	ext_str_limit, ptr->ext_str_table);
304	✓✓	48	for (i = ext_str_count - 1; i >= 0; i--) {
305			TR(TRACE_DATABASE, ("MOVE from [%d:%d] %s",
306			i, i + str_count,
307			_nc_visbuf(ptr->Strings[i + str_count])));
308		21	ptr->Strings[i + STRCOUNT] = ptr->Strings[i + str_count];
309	✓✗✓✓	42	if (VALID_STRING(ptr->Strings[i + STRCOUNT]))
310		6	base += (strlen(ptr->Strings[i + STRCOUNT]) + 1);
311			TR(TRACE_DATABASE, ("... to [%d] %s",
312			i + STRCOUNT,
313			_nc_visbuf(ptr->Strings[i + STRCOUNT])));
314			}
315			}
316
317	✓✗	3	if (need) {
318	✗✓	3	if (ext_str_count >= (MAX_ENTRY_SIZE * 2))
319			return (TGETENT_NO);
320	✗✓	3	if ((ptr->ext_Names = TYPE_CALLOC(char *, need)) == 0)
321			return (TGETENT_NO);
322			TR(TRACE_DATABASE,
323			("ext_NAMES starting @%d in extended_strings, first = %s",
324			base, _nc_visbuf(ptr->ext_str_table + base)));
325		6	convert_strings(buf + (2 * ext_str_count),
326			ptr->ext_Names,
327			(int) need,
328		3	ext_str_limit, ptr->ext_str_table + base);
329		3	}
330
331			T(("...done reading terminfo bool %d(%d) num %d(%d) str %d(%d)",
332			ptr->num_Booleans, ptr->ext_Booleans,
333			ptr->num_Numbers, ptr->ext_Numbers,
334			ptr->num_Strings, ptr->ext_Strings));
335
336			TR(TRACE_DATABASE, ("extend: num_Booleans:%d", ptr->num_Booleans));
337	✓✗	3	} else
338			#endif /* NCURSES_XNAMES */
339			{
340			T(("...done reading terminfo bool %d num %d str %d",
341			bool_count, num_count, str_count));
342			#if NCURSES_XNAMES
343			TR(TRACE_DATABASE, ("normal: num_Booleans:%d", ptr->num_Booleans));
344			#endif
345			}
346
347	✓✓	12	for (i = bool_count; i < BOOLCOUNT; i++)
348		3	ptr->Booleans[i] = FALSE;
349	✓✓	144	for (i = num_count; i < NUMCOUNT; i++)
350		69	ptr->Numbers[i] = ABSENT_NUMERIC;
351	✓✓	324	for (i = str_count; i < STRCOUNT; i++)
352		159	ptr->Strings[i] = ABSENT_STRING;
353
354		3	return (TGETENT_YES);
355		3	}
356
357			/*
358			* int
359			* _nc_read_file_entry(filename, ptr)
360			*
361			* Read the compiled terminfo entry in the given file into the
362			* structure pointed to by ptr, allocating space for the string
363			* table.
364			*/
365			NCURSES_EXPORT(int)
366			_nc_read_file_entry(const char const filename, TERMTYPE ptr)
367			/* return 1 if read, 0 if not found or garbled */
368			{
369			int code, fd = -1;
370			int limit;
371		6	char buffer[MAX_ENTRY_SIZE + 1];
372
373	✗✓	6	if (_nc_access(filename, R_OK) < 0
374	✓✗	6	\|\| (fd = open(filename, O_RDONLY \| O_BINARY)) < 0) {
375			T(("cannot open terminfo %s (errno=%d)", filename, errno));
376			code = TGETENT_NO;
377			} else {
378	✓✗	3	if ((limit = read(fd, buffer, sizeof(buffer))) > 0) {
379
380			T(("read terminfo %s", filename));
381	✗✓	3	if ((code = _nc_read_termtype(ptr, buffer, limit)) == TGETENT_NO) {
382			_nc_free_termtype(ptr);
383			}
384			} else {
385			code = TGETENT_NO;
386			}
387		3	close(fd);
388			}
389
390		3	return (code);
391		3	}
392
393			/*
394			* Build a terminfo pathname and try to read the data. Returns TGETENT_YES on
395			* success, TGETENT_NO on failure.
396			*/
397			static int
398			_nc_read_tic_entry(char *filename,
399			unsigned limit,
400			const char *const path,
401			const char *name,
402			TERMTYPE *const tp)
403			{
404			int result = TGETENT_NO;
405
406			/*
407			* If we are looking in a directory, assume the entry is a file under that,
408			* according to the normal rules.
409			*
410			* FIXME - add caseless-filename fixup.
411			*/
412		12	unsigned need = 4 + strlen(path) + strlen(name);
413	✓✗	6	if (need <= limit) {
414		6	(void) snprintf(filename, limit, "%s/" LEAF_FMT "/%s", path, *name, name);
415	✓✓	6	if (_nc_is_dir_path(path))
416		3	result = _nc_read_file_entry(filename, tp);
417			}
418
419			#if USE_HASHED_DB
420			else {
421			static const char suffix[] = DBM_SUFFIX;
422			DB *capdbp;
423			unsigned lens = sizeof(suffix) - 1;
424			unsigned size = strlen(path);
425			unsigned need = lens + size;
426
427			if (need <= limit) {
428			if (size >= lens
429			&& !strcmp(path + size - lens, suffix))
430			(void) strlcpy(filename, path, limit);
431			else
432			(void) snprintf(filename, limit, "%s%s", path, suffix);
433
434			/*
435			* It would be nice to optimize the dbopen/close activity, as
436			* done in the cgetent implementation for tc= clauses. However,
437			* since we support multiple database locations, we cannot do
438			* that.
439			*/
440			if ((capdbp = _nc_db_open(filename, FALSE)) != 0) {
441			DBT key, data;
442			int reccnt = 0;
443			char *save = strdup(name);
444
445			memset(&key, 0, sizeof(key));
446			key.data = save;
447			key.size = strlen(save);
448
449			/*
450			* This lookup could return termcap data, which we do not want.
451			* We are looking for compiled (binary) terminfo data.
452			*
453			* cgetent uses a two-level lookup. On the first it uses the
454			* given name to return a record containing only the aliases
455			* for an entry. On the second (using that list of aliases as
456			* a key), it returns the content of the terminal description.
457			* We expect second lookup to return data beginning with the
458			* same set of aliases.
459			*
460			* For compiled terminfo, the list of aliases in the second
461			* case will be null-terminated. A termcap entry will not be,
462			* and will run on into the description. So we can easily
463			* distinguish between the two (source/binary) by checking the
464			* lengths.
465			*/
466			while (_nc_db_get(capdbp, &key, &data) == 0) {
467			int used = data.size - 1;
468			char have = (char ) data.data;
469
470			if (*have++ == 0) {
471			if (data.size > key.size
472			&& IS_TIC_MAGIC(have)) {
473			result = _nc_read_termtype(tp, have, used);
474			if (result == TGETENT_NO) {
475			_nc_free_termtype(tp);
476			}
477			}
478			break;
479			}
480
481			/*
482			* Just in case we have a corrupt database, do not waste
483			* time with it.
484			*/
485			if (++reccnt >= 3)
486			break;
487
488			/*
489			* Prepare for the second level.
490			*/
491			key.data = have;
492			key.size = used;
493			}
494
495			_nc_db_close(capdbp);
496			free(save);
497			}
498			}
499			}
500			#endif
501		6	return result;
502			}
503			#endif /* USE_DATABASE */
504
505			/*
506			* _nc_read_entry(char name, char filename, TERMTYPE *tp)
507			*
508			* Find and read the compiled entry for a given terminal type,
509			* if it exists. We take pains here to make sure no combination
510			* of environment variables and terminal type name can be used to
511			* overrun the file buffer.
512			*/
513
514			NCURSES_EXPORT(int)
515			_nc_read_entry(const char const name, char const filename, TERMTYPE *const tp)
516			{
517			int code = TGETENT_NO;
518
519		6	snprintf(filename, PATH_MAX, "%s", name);
520	✓✗	6	if (strlen(name) == 0
521	✓✗	6	\|\| strcmp(name, ".") == 0
522	✓✗	6	\|\| strcmp(name, "..") == 0
523	✓✗	6	\|\| _nc_pathlast(name) != 0
524	✓✗	6	\|\| strchr(name, NCURSES_PATHSEP) != 0) {
525			T(("illegal or missing entry name '%s'", name));
526			} else {
527			#if USE_DATABASE
528		3	DBDIRS state = dbdTIC;
529		3	int offset = 0;
530			const char *path;
531
532	✓✗	12	while ((path = _nc_next_db(&state, &offset)) != 0) {
533		6	code = _nc_read_tic_entry(filename, PATH_MAX, path, name, tp);
534	✓✓	6	if (code == TGETENT_YES) {
535		3	_nc_last_db();
536		3	break;
537			}
538			}
539			#endif
540			#if USE_TERMCAP
541			if (code != TGETENT_YES) {
542			code = _nc_read_termcap_entry(name, tp);
543			snprintf(filename, PATH_MAX, "%s", _nc_get_source());
544			}
545			#endif
546		3	}
547		3	return code;
548			}