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comp_parse.c

/****************************************************************************
 * Copyright (c) 1998-2002,2003 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>                         *
 ****************************************************************************/

/*
 *    comp_parse.c -- parser driver loop and use handling.
 *
 *    _nc_read_entry_source(FILE *, literal, bool, bool (*hook)())
 *    _nc_resolve_uses(void)
 *    _nc_free_entries(void)
 *
 *    Use this code by calling _nc_read_entry_source() on as many source
 *    files as you like (either terminfo or termcap syntax).  If you
 *    want use-resolution, call _nc_resolve_uses().  To free the list
 *    storage, do _nc_free_entries().
 *
 */

#include <curses.priv.h>

#include <ctype.h>

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

MODULE_ID("$Id: comp_parse.c,v 1.57 2003/10/25 22:25:36 tom Exp $")

static void sanity_check(TERMTYPE *);
NCURSES_IMPEXP void NCURSES_API(*_nc_check_termtype) (TERMTYPE *) = sanity_check;

/****************************************************************************
 *
 * Entry queue handling
 *
 ****************************************************************************/
/*
 *  The entry list is a doubly linked list with NULLs terminating the lists:
 *
 *      ---------   ---------   ---------
 *      |       |   |       |   |       |   offset
 *        |-------|   |-------|   |-------|
 *      |   ----+-->|   ----+-->|  NULL |   next
 *      |-------|   |-------|   |-------|
 *      |  NULL |<--+----   |<--+----   |   last
 *      ---------   ---------   ---------
 *          ^                       ^
 *          |                       |
 *          |                       |
 *       _nc_head                _nc_tail
 */

NCURSES_EXPORT_VAR(ENTRY *) _nc_head = 0;
NCURSES_EXPORT_VAR(ENTRY *) _nc_tail = 0;

static void
enqueue(ENTRY * ep)
/* add an entry to the in-core list */
{
    ENTRY *newp = _nc_copy_entry(ep);

    if (newp == 0)
      _nc_err_abort(MSG_NO_MEMORY);

    newp->last = _nc_tail;
    _nc_tail = newp;

    newp->next = 0;
    if (newp->last)
      newp->last->next = newp;
}

NCURSES_EXPORT(void)
_nc_free_entries(ENTRY * headp)
/* free the allocated storage consumed by list entries */
{
    ENTRY *ep, *next;

    for (ep = headp; ep; ep = next) {
      /*
       * This conditional lets us disconnect storage from the list.
       * To do this, copy an entry out of the list, then null out
       * the string-table member in the original and any use entries
       * it references.
       */
      FreeIfNeeded(ep->tterm.str_table);

      next = ep->next;

      free(ep);
      if (ep == _nc_head)
          _nc_head = 0;
      if (ep == _nc_tail)
          _nc_tail = 0;
    }
}

static char *
force_bar(char *dst, char *src)
{
    if (strchr(src, '|') == 0) {
      size_t len = strlen(src);
      if (len > MAX_NAME_SIZE)
          len = MAX_NAME_SIZE;
      (void) strncpy(dst, src, len);
      (void) strcpy(dst + len, "|");
      src = dst;
    }
    return src;
}

NCURSES_EXPORT(bool)
_nc_entry_match(char *n1, char *n2)
/* do any of the aliases in a pair of terminal names match? */
{
    char *pstart, *qstart, *pend, *qend;
    char nc1[MAX_NAME_SIZE + 2], nc2[MAX_NAME_SIZE + 2];

    n1 = force_bar(nc1, n1);
    n2 = force_bar(nc2, n2);

    for (pstart = n1; (pend = strchr(pstart, '|')); pstart = pend + 1)
      for (qstart = n2; (qend = strchr(qstart, '|')); qstart = qend + 1)
          if ((pend - pstart == qend - qstart)
            && memcmp(pstart, qstart, (size_t) (pend - pstart)) == 0)
            return (TRUE);

    return (FALSE);
}

/****************************************************************************
 *
 * Entry compiler and resolution logic
 *
 ****************************************************************************/

NCURSES_EXPORT(void)
_nc_read_entry_source(FILE *fp, char *buf,
                  int literal, bool silent,
                  bool(*hook) (ENTRY *))
/* slurp all entries in the given file into core */
{
    ENTRY thisentry;
    bool oldsuppress = _nc_suppress_warnings;
    int immediate = 0;

    if (silent)
      _nc_suppress_warnings = TRUE; /* shut the lexer up, too */

    _nc_reset_input(fp, buf);
    for (;;) {
      memset(&thisentry, 0, sizeof(thisentry));
      if (_nc_parse_entry(&thisentry, literal, silent) == ERR)
          break;
      if (!isalnum(UChar(thisentry.tterm.term_names[0])))
          _nc_err_abort("terminal names must start with letter or digit");

      /*
       * This can be used for immediate compilation of entries with no
       * use references to disk, so as to avoid chewing up a lot of
       * core when the resolution code could fetch entries off disk.
       */
      if (hook != NULLHOOK && (*hook) (&thisentry))
          immediate++;
      else
          enqueue(&thisentry);
    }

    if (_nc_tail) {
      /* set up the head pointer */
      for (_nc_head = _nc_tail; _nc_head->last; _nc_head = _nc_head->last)
          continue;

      DEBUG(1, ("head = %s", _nc_head->tterm.term_names));
      DEBUG(1, ("tail = %s", _nc_tail->tterm.term_names));
    }
#ifdef TRACE
    else if (!immediate)
      DEBUG(1, ("no entries parsed"));
#endif

    _nc_suppress_warnings = oldsuppress;
}

NCURSES_EXPORT(int)
_nc_resolve_uses(bool fullresolve)
/* try to resolve all use capabilities */
{
    ENTRY *qp, *rp, *lastread = 0;
    bool keepgoing;
    int i, unresolved, total_unresolved, multiples;

    DEBUG(2, ("RESOLUTION BEGINNING"));

    /*
     * Check for multiple occurrences of the same name.
     */
    multiples = 0;
    for_entry_list(qp) {
      int matchcount = 0;

      for_entry_list(rp) {
          if (qp > rp
            && _nc_entry_match(qp->tterm.term_names, rp->tterm.term_names)) {
            matchcount++;
            if (matchcount == 1) {
                (void) fprintf(stderr, "Name collision between %s",
                           _nc_first_name(qp->tterm.term_names));
                multiples++;
            }
            if (matchcount >= 1)
                (void) fprintf(stderr, " %s", _nc_first_name(rp->tterm.term_names));
          }
      }
      if (matchcount >= 1)
          (void) putc('\n', stderr);
    }
    if (multiples > 0)
      return (FALSE);

    DEBUG(2, ("NO MULTIPLE NAME OCCURRENCES"));

    /*
     * First resolution stage: compute link pointers corresponding to names.
     */
    total_unresolved = 0;
    _nc_curr_col = -1;
    for_entry_list(qp) {
      unresolved = 0;
      for (i = 0; i < qp->nuses; i++) {
          bool foundit;
          char *child = _nc_first_name(qp->tterm.term_names);
          char *lookfor = qp->uses[i].name;
          long lookline = qp->uses[i].line;

          foundit = FALSE;

          _nc_set_type(child);

          /* first, try to resolve from in-core records */
          for_entry_list(rp) {
            if (rp != qp
                && _nc_name_match(rp->tterm.term_names, lookfor, "|")) {
                DEBUG(2, ("%s: resolving use=%s (in core)",
                        child, lookfor));

                qp->uses[i].link = rp;
                foundit = TRUE;
            }
          }

          /* if that didn't work, try to merge in a compiled entry */
          if (!foundit) {
            TERMTYPE thisterm;
            char filename[PATH_MAX];

            memset(&thisterm, 0, sizeof(thisterm));
            if (_nc_read_entry(lookfor, filename, &thisterm) == 1) {
                DEBUG(2, ("%s: resolving use=%s (compiled)",
                        child, lookfor));

                rp = typeMalloc(ENTRY, 1);
                if (rp == 0)
                  _nc_err_abort(MSG_NO_MEMORY);
                rp->tterm = thisterm;
                rp->nuses = 0;
                rp->next = lastread;
                lastread = rp;

                qp->uses[i].link = rp;
                foundit = TRUE;
            }
          }

          /* no good, mark this one unresolvable and complain */
          if (!foundit) {
            unresolved++;
            total_unresolved++;

            _nc_curr_line = lookline;
            _nc_warning("resolution of use=%s failed", lookfor);
            qp->uses[i].link = 0;
          }
      }
    }
    if (total_unresolved) {
      /* free entries read in off disk */
      _nc_free_entries(lastread);
      return (FALSE);
    }

    DEBUG(2, ("NAME RESOLUTION COMPLETED OK"));

    /*
     * OK, at this point all (char *) references in `name' members
     * have been successfully converted to (ENTRY *) pointers in
     * `link' members.  Time to do the actual merges.
     */
    if (fullresolve) {
      do {
          TERMTYPE merged;

          keepgoing = FALSE;

          for_entry_list(qp) {
            if (qp->nuses > 0) {
                DEBUG(2, ("%s: attempting merge",
                        _nc_first_name(qp->tterm.term_names)));
                /*
                 * If any of the use entries we're looking for is
                 * incomplete, punt.  We'll catch this entry on a
                 * subsequent pass.
                 */
                for (i = 0; i < qp->nuses; i++)
                  if (qp->uses[i].link->nuses) {
                      DEBUG(2, ("%s: use entry %d unresolved",
                              _nc_first_name(qp->tterm.term_names), i));
                      goto incomplete;
                  }

                /*
                   * First, make sure there's no garbage in the
                   * merge block.  as a side effect, copy into
                   * the merged entry the name field and string
                   * table pointer.
                 */
                _nc_copy_termtype(&merged, &(qp->tterm));

                /*
                 * Now merge in each use entry in the proper
                 * (reverse) order.
                 */
                for (; qp->nuses; qp->nuses--)
                  _nc_merge_entry(&merged,
                              &qp->uses[qp->nuses - 1].link->tterm);

                /*
                 * Now merge in the original entry.
                 */
                _nc_merge_entry(&merged, &qp->tterm);

                /*
                 * Replace the original entry with the merged one.
                 */
                FreeIfNeeded(qp->tterm.Booleans);
                FreeIfNeeded(qp->tterm.Numbers);
                FreeIfNeeded(qp->tterm.Strings);
                qp->tterm = merged;
                _nc_wrap_entry(qp, TRUE);

                /*
                 * We know every entry is resolvable because name resolution
                 * didn't bomb.  So go back for another pass.
                 */
                /* FALLTHRU */
              incomplete:
                keepgoing = TRUE;
            }
          }
      } while
          (keepgoing);

      DEBUG(2, ("MERGES COMPLETED OK"));
    }

    /*
     * We'd like to free entries read in off disk at this point, but can't.
     * The merge_entry() code doesn't copy the strings in the use entries,
     * it just aliases them.  If this ever changes, do a
     * free_entries(lastread) here.
     */

    DEBUG(2, ("RESOLUTION FINISHED"));

    if (fullresolve)
      if (_nc_check_termtype != 0) {
          _nc_curr_col = -1;
          for_entry_list(qp) {
            _nc_curr_line = qp->startline;
            _nc_set_type(_nc_first_name(qp->tterm.term_names));
            _nc_check_termtype(&qp->tterm);
          }
          DEBUG(2, ("SANITY CHECK FINISHED"));
      }

    return (TRUE);
}

/*
 * This bit of legerdemain turns all the terminfo variable names into
 * references to locations in the arrays Booleans, Numbers, and Strings ---
 * precisely what's needed.
 */

#undef CUR
#define CUR tp->

static void
sanity_check(TERMTYPE * tp)
{
    if (!PRESENT(exit_attribute_mode)) {
#ifdef __UNUSED__       /* this casts too wide a net */
      bool terminal_entry = !strchr(tp->term_names, '+');
      if (terminal_entry &&
          (PRESENT(set_attributes)
           || PRESENT(enter_standout_mode)
           || PRESENT(enter_underline_mode)
           || PRESENT(enter_blink_mode)
           || PRESENT(enter_bold_mode)
           || PRESENT(enter_dim_mode)
           || PRESENT(enter_secure_mode)
           || PRESENT(enter_protected_mode)
           || PRESENT(enter_reverse_mode)))
          _nc_warning("no exit_attribute_mode");
#endif /* __UNUSED__ */
      PAIRED(enter_standout_mode, exit_standout_mode);
      PAIRED(enter_underline_mode, exit_underline_mode);
    }

    /* we do this check/fix in postprocess_termcap(), but some packagers
     * prefer to bypass it...
     */
    if (acs_chars == 0
      && enter_alt_charset_mode != 0
      && exit_alt_charset_mode != 0)
      acs_chars = strdup(VT_ACSC);

    /* listed in structure-member order of first argument */
    PAIRED(enter_alt_charset_mode, exit_alt_charset_mode);
    ANDMISSING(enter_alt_charset_mode, acs_chars);
    ANDMISSING(exit_alt_charset_mode, acs_chars);
    ANDMISSING(enter_blink_mode, exit_attribute_mode);
    ANDMISSING(enter_bold_mode, exit_attribute_mode);
    PAIRED(exit_ca_mode, enter_ca_mode);
    PAIRED(enter_delete_mode, exit_delete_mode);
    ANDMISSING(enter_dim_mode, exit_attribute_mode);
    PAIRED(enter_insert_mode, exit_insert_mode);
    ANDMISSING(enter_secure_mode, exit_attribute_mode);
    ANDMISSING(enter_protected_mode, exit_attribute_mode);
    ANDMISSING(enter_reverse_mode, exit_attribute_mode);
    PAIRED(from_status_line, to_status_line);
    PAIRED(meta_off, meta_on);

    PAIRED(prtr_on, prtr_off);
    PAIRED(save_cursor, restore_cursor);
    PAIRED(enter_xon_mode, exit_xon_mode);
    PAIRED(enter_am_mode, exit_am_mode);
    ANDMISSING(label_off, label_on);
#ifdef remove_clock
    PAIRED(display_clock, remove_clock);
#endif
    ANDMISSING(set_color_pair, initialize_pair);
}

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