write_entry.c

ncurses-5.4 需要的就来下把 一定会有用的哦

	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;
}