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read_entry.c

/****************************************************************************
 * Copyright (c) 1998-2003,2004 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                                                *
 ****************************************************************************/

/*
 *    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: read_entry.c,v 1.79 2004/01/11 01:57:05 tom Exp $")

#if !HAVE_TELL
#define tell(fd) lseek(fd, 0, SEEK_CUR)         /* lseek() is POSIX, but not tell() */
#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 + 1];
    unsigned want, have;

    TR(TRACE_DATABASE, ("READ termtype header @%ld", (long) tell(fd)));

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

    /* grab the header */
    if (!read_shorts(fd, buf, 6)
      || LOW_MSB(buf) != MAGIC) {
      return (0);
    }

    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-terminated string) */
    want = min(MAX_NAME_SIZE, (unsigned) name_size);
    if ((have = read(fd, buf, want)) != want) {
      memset(buf + have, 0, want - have);
    }
    buf[want] = '\0';
    ptr->term_names = typeCalloc(char, strlen(buf) + 1);
    if (ptr->term_names == NULL) {
      return (0);
    }
    (void) strcpy(ptr->term_names, buf);
    if (have > MAX_NAME_SIZE)
      lseek(fd, (off_t) (have - 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 @%ld", (long) 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 @%ld",
                      ext_bool_count, (long) 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 @%ld",
                      ext_num_count, (long) 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 @%ld", (long) 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 @%ld",
                      ext_str_limit, (long) 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));
      code = 0;
    } else {
      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)
{
    int need = 2 + strlen(dir) + strlen(ttn);

    if (need > PATH_MAX)
      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[PATH_MAX];

    if (strlen(tn) == 0
      || strcmp(tn, ".") == 0
      || strcmp(tn, "..") == 0
      || _nc_pathlast(tn) != 0) {
      T(("illegal or missing entry name '%s'", tn));
      return 0;
    }

    /* truncate the terminal name to prevent buffer overflow */
    (void) sprintf(ttn, "%c/%.*s", *tn, (int) sizeof(ttn) - 3, 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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