You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
#include <config.h>
#endif /* VMS */
}
+/* Buffer used for reading from documentation file. */
+static char *get_doc_string_buffer;
+static int get_doc_string_buffer_size;
+
/* Extract a doc string from a file. FILEPOS says where to get it.
If it is an integer, use that position in the standard DOC-... file.
If it is (FILE . INTEGER), use FILE as the file name
get_doc_string (filepos)
Lisp_Object filepos;
{
- char buf[512 * 32 + 1];
- char *buffer;
- int buffer_size;
- int free_it;
char *from, *to;
register int fd;
register char *name;
register char *p, *p1;
int minsize;
- int position;
+ int offset, position;
Lisp_Object file, tem;
if (INTEGERP (filepos))
fd = open (name, O_RDONLY, 0);
}
#endif
-
if (fd < 0)
error ("Cannot open doc string file \"%s\"", name);
}
- if (0 > lseek (fd, position, 0))
+ /* Seek only to beginning of disk block. */
+ offset = position % (8 * 1024);
+ if (0 > lseek (fd, position - offset, 0))
{
close (fd);
error ("Position %ld out of range in doc string file \"%s\"",
position, name);
}
- /* Read the doc string into a buffer.
- Use the fixed buffer BUF if it is big enough;
- otherwise allocate one and set FREE_IT.
- We store the buffer in use in BUFFER and its size in BUFFER_SIZE. */
+ /* Read the doc string into get_doc_string_buffer.
+ P points beyond the data just read. */
- buffer = buf;
- buffer_size = sizeof buf;
- free_it = 0;
- p = buf;
+ p = get_doc_string_buffer;
while (1)
{
- int space_left = buffer_size - (p - buffer);
+ int space_left = (get_doc_string_buffer_size
+ - (p - get_doc_string_buffer));
int nread;
- /* Switch to a bigger buffer if we need one. */
+ /* Allocate or grow the buffer if we need to. */
if (space_left == 0)
{
- if (free_it)
- {
- int offset = p - buffer;
- buffer = (char *) xrealloc (buffer,
- buffer_size *= 2);
- p = buffer + offset;
- }
- else
- {
- buffer = (char *) xmalloc (buffer_size *= 2);
- bcopy (buf, buffer, p - buf);
- p = buffer + (p - buf);
- }
- free_it = 1;
- space_left = buffer_size - (p - buffer);
+ int in_buffer = p - get_doc_string_buffer;
+ get_doc_string_buffer_size += 16 * 1024;
+ get_doc_string_buffer
+ = (char *) xrealloc (get_doc_string_buffer,
+ get_doc_string_buffer_size + 1);
+ p = get_doc_string_buffer + in_buffer;
+ space_left = (get_doc_string_buffer_size
+ - (p - get_doc_string_buffer));
}
- /* Don't read too too much at one go. */
+ /* Read a disk block at a time.
+ If we read the same block last time, maybe skip this? */
if (space_left > 1024 * 8)
space_left = 1024 * 8;
nread = read (fd, p, space_left);
p[nread] = 0;
if (!nread)
break;
- p1 = index (p, '\037');
+ if (p == get_doc_string_buffer)
+ p1 = index (p + offset, '\037');
+ else
+ p1 = index (p, '\037');
if (p1)
{
*p1 = 0;
/* Scan the text and perform quoting with ^A (char code 1).
^A^A becomes ^A, ^A0 becomes a null char, and ^A_ becomes a ^_. */
- from = buffer;
- to = buffer;
+ from = get_doc_string_buffer + offset;
+ to = get_doc_string_buffer + offset;
while (from != p)
{
if (*from == 1)
*to++ = *from++;
}
- tem = make_string (buffer, to - buffer);
- if (free_it)
- free (buffer);
-
- return tem;
+ return make_string (get_doc_string_buffer + offset,
+ to - (get_doc_string_buffer + offset));
}
/* Get a string from position FILEPOS and pass it through the Lisp reader.