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write_entry.c

/****************************************************************************
 * Copyright (c) 1998-2000,2002 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>                         *
 ****************************************************************************/

/*
 *    write_entry.c -- write a terminfo structure onto the file system
 */

#include <curses.priv.h>

#include <sys/stat.h>

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

#ifndef S_ISDIR
#define S_ISDIR(mode) ((mode & S_IFMT) == S_IFDIR)
#endif

#if 0
#define TRACE_OUT(p) DEBUG(2, p)
#else
#define TRACE_OUT(p)          /*nothing */
#endif

MODULE_ID("$Id: write_entry.c,v 1.58 2002/04/21 20:35:08 tom Exp $")

static int total_written;

static int write_object(FILE *, TERMTYPE *);

static void
write_file(char *filename, TERMTYPE * tp)
{
    FILE *fp = (_nc_access(filename, W_OK) == 0) ? fopen(filename, "wb") : 0;
    if (fp == 0) {
      perror(filename);
      _nc_syserr_abort("can't open %s/%s", _nc_tic_dir(0), filename);
    }
    DEBUG(1, ("Created %s", filename));

    if (write_object(fp, tp) == ERR) {
      _nc_syserr_abort("error writing %s/%s", _nc_tic_dir(0), filename);
    }
    fclose(fp);
}

/*
 *    make_directory(char *path)
 *
 *    Make a directory if it doesn't exist.
 */
static int
make_directory(const char *path)
{
    int rc;
    struct stat statbuf;
    char fullpath[PATH_MAX];
    const char *destination = _nc_tic_dir(0);

    if (path == destination || *path == '/') {
      if (strlen(path) + 1 > sizeof(fullpath))
          return (-1);
      (void) strcpy(fullpath, path);
    } else {
      if (strlen(destination) + strlen(path) + 2 > sizeof(fullpath))
          return (-1);
      (void) sprintf(fullpath, "%s/%s", destination, path);
    }

    if ((rc = stat(path, &statbuf)) < 0) {
      rc = mkdir(path, 0777);
    } else {
      if (_nc_access(path, R_OK | W_OK | X_OK) < 0) {
          rc = -1;            /* permission denied */
      } else if (!(S_ISDIR(statbuf.st_mode))) {
          rc = -1;            /* not a directory */
      }
    }
    return rc;
}

NCURSES_EXPORT(void)
_nc_set_writedir(char *dir)
/* set the write directory for compiled entries */
{
    const char *destination;
    char actual[PATH_MAX];

    if (dir == 0
      && use_terminfo_vars())
      dir = getenv("TERMINFO");

    if (dir != 0)
      (void) _nc_tic_dir(dir);

    destination = _nc_tic_dir(0);
    if (make_directory(destination) < 0) {
      char *home = _nc_home_terminfo();

      if (home != 0) {
          destination = home;
          if (make_directory(destination) < 0)
            _nc_err_abort("%s: permission denied (errno %d)",
                        destination, errno);
      }
    }

    /*
     * Note: because of this code, this logic should be exercised
     * *once only* per run.
     */
    if (chdir(_nc_tic_dir(destination)) < 0
      || getcwd(actual, sizeof(actual)) == 0)
      _nc_err_abort("%s: not a directory", destination);
    _nc_keep_tic_dir(strdup(actual));
}

/*
 *    check_writeable(char code)
 *
 *    Miscellaneous initialisations
 *
 *    Check for access rights to destination directories
 *    Create any directories which don't exist.
 *    Note: there's no reason to return the result of make_directory(), since
 *    this function is called only in instances where that has to succeed.
 *
 */

static void
check_writeable(int code)
{
    static const char dirnames[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    static bool verified[sizeof(dirnames)];

    char dir[2];
    char *s = 0;

    if (code == 0 || (s = strchr(dirnames, code)) == 0)
      _nc_err_abort("Illegal terminfo subdirectory \"%c\"", code);

    if (verified[s - dirnames])
      return;

    dir[0] = code;
    dir[1] = '\0';
    if (make_directory(dir) < 0) {
      _nc_err_abort("%s/%s: permission denied", _nc_tic_dir(0), dir);
    }

    verified[s - dirnames] = TRUE;
}

/*
 *    _nc_write_entry()
 *
 *    Save the compiled version of a description in the filesystem.
 *
 *    make a copy of the name-list
 *    break it up into first-name and all-but-last-name
 *    creat(first-name)
 *    write object information to first-name
 *    close(first-name)
 *      for each name in all-but-last-name
 *        link to first-name
 *
 *    Using 'time()' to obtain a reference for file timestamps is unreliable,
 *    e.g., with NFS, because the filesystem may have a different time
 *    reference.  We check for pre-existence of links by latching the first
 *    timestamp from a file that we create.
 *
 *    The _nc_warning() calls will report a correct line number only if
 *    _nc_curr_line is properly set before the write_entry() call.
 */

void
_nc_write_entry(TERMTYPE * const tp)
{
    struct stat statbuf;
    char name_list[MAX_TERMINFO_LENGTH];
    char *first_name, *other_names;
    char *ptr;
    char filename[PATH_MAX];
    char linkname[PATH_MAX];
#if USE_SYMLINKS
    char symlinkname[PATH_MAX];
#if !HAVE_LINK
#undef HAVE_LINK
#define HAVE_LINK 1
#endif
#endif /* USE_SYMLINKS */
    static int call_count;
    static time_t start_time; /* time at start of writes */

    if (call_count++ == 0) {
      start_time = 0;
    }

    (void) strcpy(name_list, tp->term_names);
    DEBUG(7, ("Name list = '%s'", name_list));

    first_name = name_list;

    ptr = &name_list[strlen(name_list) - 1];
    other_names = ptr + 1;

    while (ptr > name_list && *ptr != '|')
      ptr--;

    if (ptr != name_list) {
      *ptr = '\0';

      for (ptr = name_list; *ptr != '\0' && *ptr != '|'; ptr++)
          continue;

      if (*ptr == '\0')
          other_names = ptr;
      else {
          *ptr = '\0';
          other_names = ptr + 1;
      }
    }

    DEBUG(7, ("First name = '%s'", first_name));
    DEBUG(7, ("Other names = '%s'", other_names));

    _nc_set_type(first_name);

    if (strlen(first_name) > sizeof(filename) - 3)
      _nc_warning("terminal name too long.");

    sprintf(filename, "%c/%s", first_name[0], first_name);

    /*
     * Has this primary name been written since the first call to
     * write_entry()?  If so, the newer write will step on the older,
     * so warn the user.
     */
    if (start_time > 0 &&
      stat(filename, &statbuf) >= 0
      && statbuf.st_mtime >= start_time) {
      _nc_warning("name multiply defined.");
    }

    check_writeable(first_name[0]);
    write_file(filename, tp);

    if (start_time == 0) {
      if (stat(filename, &statbuf) < 0
          || (start_time = statbuf.st_mtime) == 0) {
          _nc_syserr_abort("error obtaining time from %s/%s",
                       _nc_tic_dir(0), filename);
      }
    }
    while (*other_names != '\0') {
      ptr = other_names++;
      while (*other_names != '|' && *other_names != '\0')
          other_names++;

      if (*other_names != '\0')
          *(other_names++) = '\0';

      if (strlen(ptr) > sizeof(linkname) - 3) {
          _nc_warning("terminal alias %s too long.", ptr);
          continue;
      }
      if (strchr(ptr, '/') != 0) {
          _nc_warning("cannot link alias %s.", ptr);
          continue;
      }

      check_writeable(ptr[0]);
      sprintf(linkname, "%c/%s", ptr[0], ptr);

      if (strcmp(filename, linkname) == 0) {
          _nc_warning("self-synonym ignored");
      } else if (stat(linkname, &statbuf) >= 0 &&
               statbuf.st_mtime < start_time) {
          _nc_warning("alias %s multiply defined.", ptr);
      } else if (_nc_access(linkname, W_OK) == 0)
#if HAVE_LINK
      {
          int code;
#if USE_SYMLINKS
          strcpy(symlinkname, "../");
          strncat(symlinkname, filename, sizeof(symlinkname) - 4);
          symlinkname[sizeof(symlinkname) - 1] = '\0';
#endif /* USE_SYMLINKS */
#if HAVE_REMOVE
          code = remove(linkname);
#else
          code = unlink(linkname);
#endif
          if (code != 0 && errno == ENOENT)
            code = 0;
#if USE_SYMLINKS
          if (symlink(symlinkname, linkname) < 0)
#else
          if (link(filename, linkname) < 0)
#endif /* USE_SYMLINKS */
          {
            /*
             * If there wasn't anything there, and we cannot
             * link to the target because it is the same as the
             * target, then the source must be on a filesystem
             * that uses caseless filenames, such as Win32, etc.
             */
            if (code == 0 && errno == EEXIST)
                _nc_warning("can't link %s to %s", filename, linkname);
            else if (code == 0 && (errno == EPERM || errno == ENOENT))
                write_file(linkname, tp);
            else {
#if MIXEDCASE_FILENAMES
                _nc_syserr_abort("can't link %s to %s", filename, linkname);
#else
                _nc_warning("can't link %s to %s (errno=%d)", filename,
                        linkname, errno);
#endif
            }
          } else {
            DEBUG(1, ("Linked %s", linkname));
          }
      }
#else /* just make copies */
          write_file(linkname, tp);
#endif /* HAVE_LINK */
    }
}

#undef LITTLE_ENDIAN          /* BSD/OS defines this as a feature macro */
#define HI(x)                 ((x) / 256)
#define LO(x)                 ((x) % 256)
#define LITTLE_ENDIAN(p, x)   (p)[0] = LO(x), (p)[1] = HI(x)

#define WRITE_STRING(str) (fwrite(str, sizeof(char), strlen(str) + 1, fp) == strlen(str) + 1)

static int
compute_offsets(char **Strings, unsigned strmax, short *offsets)
{
    size_t nextfree = 0;
    unsigned i;

    for (i = 0; i < strmax; i++) {
      if (Strings[i] == ABSENT_STRING) {
          offsets[i] = -1;
      } else if (Strings[i] == CANCELLED_STRING) {
          offsets[i] = -2;
      } else {
          offsets[i] = nextfree;
          nextfree += strlen(Strings[i]) + 1;
          TRACE_OUT(("put Strings[%d]=%s(%d)", i, _nc_visbuf(Strings[i]), nextfree));
      }
    }
    return nextfree;
}

static void
convert_shorts(unsigned char *buf, short *Numbers, unsigned count)
{
    unsigned i;
    for (i = 0; i < count; i++) {
      if (Numbers[i] == ABSENT_NUMERIC) { /* HI/LO won't work */
          buf[2 * i] = buf[2 * i + 1] = 0377;
      } else if (Numbers[i] == CANCELLED_NUMERIC) {   /* HI/LO won't work */
          buf[2 * i] = 0376;
          buf[2 * i + 1] = 0377;
      } else {
          LITTLE_ENDIAN(buf + 2 * i, Numbers[i]);
          TRACE_OUT(("put Numbers[%d]=%d", i, Numbers[i]));
      }
    }
}

#define even_boundary(value) \
          ((value) % 2 != 0 && fwrite(&zero, sizeof(char), 1, fp) != 1)

static int
write_object(FILE * fp, TERMTYPE * tp)
{
    char *namelist;
    size_t namelen, boolmax, nummax, strmax;
    char zero = '\0';
    size_t i;
    short nextfree;
    short offsets[MAX_ENTRY_SIZE / 2];
    unsigned char buf[MAX_ENTRY_SIZE];
    unsigned last_bool = BOOLWRITE;
    unsigned last_num = NUMWRITE;
    unsigned last_str = STRWRITE;

#if NCURSES_XNAMES
    /*
     * Normally we limit the list of values to exclude the "obsolete"
     * capabilities.  However, if we are accepting extended names, add
     * these as well, since they are used for supporting translation
     * to/from termcap.
     */
    if (_nc_user_definable) {
      last_bool = BOOLCOUNT;
      last_num = NUMCOUNT;
      last_str = STRCOUNT;
    }
#endif

    namelist = tp->term_names;
    namelen = strlen(namelist) + 1;

    boolmax = 0;
    for (i = 0; i < last_bool; i++) {
      if (tp->Booleans[i] == TRUE)
          boolmax = i + 1;
    }

    nummax = 0;
    for (i = 0; i < last_num; i++) {
      if (tp->Numbers[i] != ABSENT_NUMERIC)
          nummax = i + 1;
    }

    strmax = 0;
    for (i = 0; i < last_str; i++) {
      if (tp->Strings[i] != ABSENT_STRING)
          strmax = i + 1;
    }

    nextfree = compute_offsets(tp->Strings, strmax, offsets);

    /* fill in the header */
    LITTLE_ENDIAN(buf, MAGIC);
    LITTLE_ENDIAN(buf + 2, min(namelen, MAX_NAME_SIZE + 1));
    LITTLE_ENDIAN(buf + 4, boolmax);
    LITTLE_ENDIAN(buf + 6, nummax);
    LITTLE_ENDIAN(buf + 8, strmax);
    LITTLE_ENDIAN(buf + 10, nextfree);

    /* write out the header */
    TRACE_OUT(("Header of %s @%ld", namelist, ftell(fp)));
    if (fwrite(buf, 12, 1, fp) != 1
      || fwrite(namelist, sizeof(char), namelen, fp) != namelen)
        return (ERR);

    for (i = 0; i < boolmax; i++)
      if (tp->Booleans[i] == TRUE)
          buf[i] = TRUE;
      else
          buf[i] = FALSE;
    if (fwrite(buf, sizeof(char), boolmax, fp) != boolmax)
        return (ERR);

    if (even_boundary(namelen + boolmax))
      return (ERR);

    TRACE_OUT(("Numerics begin at %04lx", ftell(fp)));

    /* the numerics */
    convert_shorts(buf, tp->Numbers, nummax);
    if (fwrite(buf, 2, nummax, fp) != nummax)
      return (ERR);

    TRACE_OUT(("String offsets begin at %04lx", ftell(fp)));

    /* the string offsets */
    convert_shorts(buf, offsets, strmax);
    if (fwrite(buf, 2, strmax, fp) != strmax)
      return (ERR);

    TRACE_OUT(("String table begins at %04lx", ftell(fp)));

    /* the strings */
    for (i = 0; i < strmax; i++)
      if (VALID_STRING(tp->Strings[i]))
          if (!WRITE_STRING(tp->Strings[i]))
            return (ERR);

#if NCURSES_XNAMES
    if (NUM_EXT_NAMES(tp)) {
      unsigned extcnt = NUM_EXT_NAMES(tp);

      if (even_boundary(nextfree))
          return (ERR);

      nextfree = compute_offsets(tp->Strings + STRCOUNT, tp->ext_Strings, offsets);
      TRACE_OUT(("after extended string capabilities, nextfree=%d", nextfree));
      nextfree += compute_offsets(tp->ext_Names, extcnt, offsets + tp->ext_Strings);
      TRACE_OUT(("after extended capnames, nextfree=%d", nextfree));
      strmax = tp->ext_Strings + extcnt;

      /*
       * Write the extended header
       */
      LITTLE_ENDIAN(buf + 0, tp->ext_Booleans);
      LITTLE_ENDIAN(buf + 2, tp->ext_Numbers);
      LITTLE_ENDIAN(buf + 4, tp->ext_Strings);
      LITTLE_ENDIAN(buf + 6, strmax);
      LITTLE_ENDIAN(buf + 8, nextfree);
      TRACE_OUT(("WRITE extended-header @%ld", ftell(fp)));
      if (fwrite(buf, 10, 1, fp) != 1)
          return (ERR);

      TRACE_OUT(("WRITE %d booleans @%ld", tp->ext_Booleans, ftell(fp)));
      if (tp->ext_Booleans
          && fwrite(tp->Booleans + BOOLCOUNT, sizeof(char),
                  tp->ext_Booleans, fp) != tp->ext_Booleans)
            return (ERR);

      if (even_boundary(tp->ext_Booleans))
          return (ERR);

      TRACE_OUT(("WRITE %d numbers @%ld", tp->ext_Numbers, ftell(fp)));
      if (tp->ext_Numbers) {
          convert_shorts(buf, tp->Numbers + NUMCOUNT, tp->ext_Numbers);
          if (fwrite(buf, 2, tp->ext_Numbers, fp) != tp->ext_Numbers)
            return (ERR);
      }

      /*
       * Convert the offsets for the ext_Strings and ext_Names tables,
       * in that order.
       */
      convert_shorts(buf, offsets, strmax);
      TRACE_OUT(("WRITE offsets @%ld", ftell(fp)));
      if (fwrite(buf, 2, strmax, fp) != strmax)
          return (ERR);

      /*
       * Write the string table after the offset tables so we do not
       * have to do anything about alignment.
       */
      for (i = 0; i < tp->ext_Strings; i++) {
          if (VALID_STRING(tp->Strings[i + STRCOUNT])) {
            TRACE_OUT(("WRITE ext_Strings[%d]=%s", i,
                     _nc_visbuf(tp->Strings[i + STRCOUNT])));
            if (!WRITE_STRING(tp->Strings[i + STRCOUNT]))
                return (ERR);
          }
      }

      /*
       * Write the extended names
       */
      for (i = 0; i < extcnt; i++) {
          TRACE_OUT(("WRITE ext_Names[%d]=%s", i, tp->ext_Names[i]));
          if (!WRITE_STRING(tp->ext_Names[i]))
            return (ERR);
      }

    }
#endif /* NCURSES_XNAMES */

    total_written++;
    return (OK);
}

/*
 * Returns the total number of entries written by this process
 */
NCURSES_EXPORT(int)
_nc_tic_written(void)
{
    return total_written;
}

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