1 files changed, 177 insertions, 274 deletions

diff --git a/src/fileio.c b/src/fileio.c
index 894189008d5..529722ded82 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -87,7 +87,7 @@ extern int errno;
 #include "lisp.h"
 #include "intervals.h"
 #include "buffer.h"
-#include "charset.h"
+#include "character.h"
 #include "coding.h"
 #include "window.h"
 
@@ -3576,7 +3576,7 @@ actually used.  */)
   unsigned char buffer[1 << 14];
   int replace_handled = 0;
   int set_coding_system = 0;
-  int coding_system_decided = 0;
+  Lisp_Object coding_system;
   int read_quit = 0;
 
   if (current_buffer->base_buffer && ! NILP (visit))
@@ -3713,20 +3713,20 @@ actually used.  */)
         }
     }
 
+  /* The value Qnil means that the coding system is not yet
+     decided.  */
+  coding_system = Qnil;
   if (BEG < Z)
     {
       /* Decide the coding system to use for reading the file now
          because we can't use an optimized method for handling
          `coding:' tag if the current buffer is not empty.  */
-      Lisp_Object val;
-      val = Qnil;
-
       if (!NILP (Vcoding_system_for_read))
-        val = Vcoding_system_for_read;
+        coding_system = Vcoding_system_for_read;
       else if (! NILP (replace))
         /* In REPLACE mode, we can use the same coding system
            that was used to visit the file.  */
-        val = current_buffer->buffer_file_coding_system;
+        coding_system = current_buffer->buffer_file_coding_system;
       else
         {
           /* Don't try looking inside a file for a coding system
@@ -3773,8 +3773,8 @@ actually used.  */)
                   current_buffer->enable_multibyte_characters = Qnil;
                   insert_1_both (read_buf, nread, nread, 0, 0, 0);
                   TEMP_SET_PT_BOTH (BEG, BEG_BYTE);
-                  val = call2 (Vset_auto_coding_function,
-                               filename, make_number (nread));
+                  coding_system = call2 (Vset_auto_coding_function,
+                                                filename, make_number (nread));
                   set_buffer_internal (prev);
 
                   /* Remove the binding for standard-output.  */
@@ -3791,7 +3791,7 @@ actually used.  */)
                 }
             }
 
-          if (NILP (val))
+          if (NILP (coding_system))
             {
               /* If we have not yet decided a coding system, check
                  file-coding-system-alist.  */
@@ -3805,20 +3805,19 @@ actually used.  */)
             }
         }
 
-      setup_coding_system (Fcheck_coding_system (val), &coding);
-      /* Ensure we set Vlast_coding_system_used.  */
-      set_coding_system = 1;
+      if (NILP (coding_system))
+        coding_system = Qundecided;
+      else
+        CHECK_CODING_SYSTEM (coding_system);
 
-      if (NILP (current_buffer->enable_multibyte_characters)
-          && ! NILP (val))
+      if (NILP (current_buffer->enable_multibyte_characters))
         /* We must suppress all character code conversion except for
            end-of-line conversion.  */
-        setup_raw_text_coding_system (&coding);
+        coding_system = raw_text_coding_system (coding_system);
 
-      coding.src_multibyte = 0;
-      coding.dst_multibyte
-        = !NILP (current_buffer->enable_multibyte_characters);
-      coding_system_decided = 1;
+      setup_coding_system (coding_system, &coding);
+      /* Ensure we set Vlast_coding_system_used.  */
+      set_coding_system = 1;
     }
 
   /* If requested, replace the accessible part of the buffer
@@ -3837,7 +3836,8 @@ actually used.  */)
      and let the following if-statement handle the replace job.  */
   if (!NILP (replace)
       && BEGV < ZV
-      && !(coding.common_flags & CODING_REQUIRE_DECODING_MASK))
+      && (NILP (coding_system)
+          || ! CODING_REQUIRE_DECODING (&coding)))
     {
       /* same_at_start and same_at_end count bytes,
          because file access counts bytes
@@ -3872,21 +3872,14 @@ actually used.  */)
           else if (nread == 0)
             break;
 
-          if (coding.type == coding_type_undecided)
-            detect_coding (&coding, buffer, nread);
-          if (coding.common_flags & CODING_REQUIRE_DECODING_MASK)
-            /* We found that the file should be decoded somehow.
-               Let's give up here.  */
+          if (CODING_REQUIRE_DETECTION (&coding))
             {
-              giveup_match_end = 1;
-              break;
+              coding_system = detect_coding_system (buffer, nread, 1, 0,
+                                                    coding_system);
+              setup_coding_system (coding_system, &coding);
             }
-
-          if (coding.eol_type == CODING_EOL_UNDECIDED)
-            detect_eol (&coding, buffer, nread);
-          if (coding.eol_type != CODING_EOL_UNDECIDED
-              && coding.eol_type != CODING_EOL_LF)
-            /* We found that the format of eol should be decoded.
+          if (CODING_REQUIRE_DECODING (&coding))
+            /* We found that the file should be decoded somehow.
                Let's give up here.  */
             {
               giveup_match_end = 1;
@@ -4033,17 +4026,20 @@ actually used.  */)
       int same_at_end = ZV_BYTE;
       int overlap;
       int bufpos;
-      /* Make sure that the gap is large enough.  */
-      int bufsize = 2 * st.st_size;
-      unsigned char *conversion_buffer = (unsigned char *) xmalloc (bufsize);
+      unsigned char *decoded;
       int temp;
+      int this_count = BINDING_STACK_SIZE ();
+      Lisp_Object conversion_buffer
+        = make_conversion_work_buffer (! NILP (current_buffer
+                                               ->enable_multibyte_characters));
+
+      record_unwind_protect (code_conversion_restore, save_excursion_save ());
 
       /* First read the whole file, performing code conversion into
          CONVERSION_BUFFER.  */
 
       if (lseek (fd, XINT (beg), 0) < 0)
         {
-          xfree (conversion_buffer);
           report_file_error ("Setting file position",
                              Fcons (orig_filename, Qnil));
         }
@@ -4055,71 +4051,41 @@ actually used.  */)
 
       while (how_much < total)
         {
+          /* We read one bunch by one (READ_BUF_SIZE bytes) to allow
+             quitting while reading a huge while.  */
           /* try is reserved in some compilers (Microsoft C) */
           int trytry = min (total - how_much, READ_BUF_SIZE - unprocessed);
-          unsigned char *destination = read_buf + unprocessed;
           int this;
 
           /* Allow quitting out of the actual I/O.  */
           immediate_quit = 1;
           QUIT;
-          this = emacs_read (fd, destination, trytry);
+          this = emacs_read (fd, read_buf + unprocessed, trytry);
           immediate_quit = 0;
 
-          if (this < 0 || this + unprocessed == 0)
+          if (this <= 0)
             {
-              how_much = this;
+              if (this < 0)
+                how_much = this;
               break;
             }
 
           how_much += this;
 
-          if (CODING_MAY_REQUIRE_DECODING (&coding))
-            {
-              int require, result;
-
-              this += unprocessed;
-
-              /* If we are using more space than estimated,
-                 make CONVERSION_BUFFER bigger.  */
-              require = decoding_buffer_size (&coding, this);
-              if (inserted + require + 2 * (total - how_much) > bufsize)
-                {
-                  bufsize = inserted + require + 2 * (total - how_much);
-                  conversion_buffer = (unsigned char *) xrealloc (conversion_buffer, bufsize);
-                }
-
-              /* Convert this batch with results in CONVERSION_BUFFER.  */
-              if (how_much >= total)  /* This is the last block.  */
-                coding.mode |= CODING_MODE_LAST_BLOCK;
-              if (coding.composing != COMPOSITION_DISABLED)
-                coding_allocate_composition_data (&coding, BEGV);
-              result = decode_coding (&coding, read_buf,
-                                      conversion_buffer + inserted,
-                                      this, bufsize - inserted);
-
-              /* Save for next iteration whatever we didn't convert.  */
-              unprocessed = this - coding.consumed;
-              bcopy (read_buf + coding.consumed, read_buf, unprocessed);
-              if (!NILP (current_buffer->enable_multibyte_characters))
-                this = coding.produced;
-              else
-                this = str_as_unibyte (conversion_buffer + inserted,
-                                       coding.produced);
-            }
-
-          inserted += this;
-        }
+          decode_coding_c_string (&coding, read_buf, unprocessed + this,
+                                  conversion_buffer);
+          unprocessed = coding.carryover_bytes;
+          if (coding.carryover_bytes > 0)
+            bcopy (coding.carryover, read_buf, unprocessed);
+        }         
+      
+      emacs_close (fd);
 
-      /* At this point, INSERTED is how many characters (i.e. bytes)
-         are present in CONVERSION_BUFFER.
-         HOW_MUCH should equal TOTAL,
-         or should be <= 0 if we couldn't read the file.  */
+      /* At this point, HOW_MUCH should equal TOTAL, or should be <= 0
+         if we couldn't read the file.  */
 
       if (how_much < 0)
         {
-          xfree (conversion_buffer);
-
           if (how_much == -1)
             error ("IO error reading %s: %s",
                    XSTRING (orig_filename)->data, emacs_strerror (errno));
@@ -4127,21 +4093,30 @@ actually used.  */)
             error ("maximum buffer size exceeded");
         }
 
-      /* Compare the beginning of the converted file
-         with the buffer text.  */
+      if (unprocessed > 0)
+        {
+          coding.mode |= CODING_MODE_LAST_BLOCK;
+          decode_coding_c_string (&coding, read_buf, unprocessed,
+                                  conversion_buffer);
+          coding.mode &= ~CODING_MODE_LAST_BLOCK;
+        }
+
+      decoded = BUF_BEG_ADDR (XBUFFER (conversion_buffer));
+      inserted = BUF_Z_BYTE (XBUFFER (conversion_buffer));
+
+      /* Compare the beginning of the converted string with the buffer
+         text.  */
 
       bufpos = 0;
       while (bufpos < inserted && same_at_start < same_at_end
-             && FETCH_BYTE (same_at_start) == conversion_buffer[bufpos])
+             && FETCH_BYTE (same_at_start) == decoded[bufpos])
         same_at_start++, bufpos++;
 
-      /* If the file matches the buffer completely,
+      /* If the file matches the head of buffer completely,
          there's no need to replace anything.  */
 
       if (bufpos == inserted)
         {
-          xfree (conversion_buffer);
-          emacs_close (fd);
           specpdl_ptr--;
           /* Truncate the buffer to the size of the file.  */
           del_range_byte (same_at_start, same_at_end, 0);
@@ -4149,8 +4124,8 @@ actually used.  */)
           goto handled;
         }
 
-      /* Extend the start of non-matching text area to multibyte
-         character boundary.  */
+      /* Extend the start of non-matching text area to the previous
+         multibyte character boundary.  */
       if (! NILP (current_buffer->enable_multibyte_characters))
         while (same_at_start > BEGV_BYTE
                && ! CHAR_HEAD_P (FETCH_BYTE (same_at_start)))
@@ -4163,11 +4138,11 @@ actually used.  */)
       /* Compare with same_at_start to avoid counting some buffer text
          as matching both at the file's beginning and at the end.  */
       while (bufpos > 0 && same_at_end > same_at_start
-             && FETCH_BYTE (same_at_end - 1) == conversion_buffer[bufpos - 1])
+             && FETCH_BYTE (same_at_end - 1) == decoded[bufpos - 1])
         same_at_end--, bufpos--;
 
-      /* Extend the end of non-matching text area to multibyte
-         character boundary.  */
+      /* Extend the end of non-matching text area to the next
+         multibyte character boundary.  */
       if (! NILP (current_buffer->enable_multibyte_characters))
         while (same_at_end < ZV_BYTE
                && ! CHAR_HEAD_P (FETCH_BYTE (same_at_end)))
@@ -4185,11 +4160,11 @@ actually used.  */)
 
       /* Replace the chars that we need to replace,
          and update INSERTED to equal the number of bytes
-         we are taking from the file.  */
+         we are taking from the decoded string.  */
       inserted -= (Z_BYTE - same_at_end) + (same_at_start - BEG_BYTE);
 
       if (same_at_end != same_at_start)
-        {
+        {       
           del_range_byte (same_at_start, same_at_end, 0);
           temp = GPT;
           same_at_start = GPT_BYTE;
@@ -4200,18 +4175,16 @@ actually used.  */)
         }
       /* Insert from the file at the proper position.  */
       SET_PT_BOTH (temp, same_at_start);
-      insert_1 (conversion_buffer + same_at_start - BEG_BYTE, inserted,
-                0, 0, 0);
-      if (coding.cmp_data && coding.cmp_data->used)
-        coding_restore_composition (&coding, Fcurrent_buffer ());
-      coding_free_composition_data (&coding);
-  
+      insert_from_buffer (XBUFFER (conversion_buffer),
+                          buf_bytepos_to_charpos (XBUFFER (conversion_buffer),
+                                                  same_at_start),
+                          buf_bytepos_to_charpos (XBUFFER (conversion_buffer),
+                                                  same_at_start + inserted),
+                          0);
       /* Set `inserted' to the number of inserted characters.  */
       inserted = PT - temp;
 
-      xfree (conversion_buffer);
-      emacs_close (fd);
-      specpdl_ptr--;
+      unbind_to (this_count, Qnil);
 
       goto handled;
     }
@@ -4255,7 +4228,7 @@ actually used.  */)
   inserted = 0;
   
   /* Here, we don't do code conversion in the loop.  It is done by
-     code_convert_region after all data are read into the buffer.  */
+     decode_coding_gap after all data are read into the buffer.  */
   {
     int gap_size = GAP_SIZE;
     
@@ -4346,18 +4319,16 @@ actually used.  */)
 
  notfound:
 
-  if (! coding_system_decided)
+  if (NILP (coding_system))
     {
       /* The coding system is not yet decided.  Decide it by an
          optimized method for handling `coding:' tag.
 
          Note that we can get here only if the buffer was empty
          before the insertion.  */
-      Lisp_Object val;
-      val = Qnil;
 
       if (!NILP (Vcoding_system_for_read))
-        val = Vcoding_system_for_read;
+        coding_system = Vcoding_system_for_read;
       else
         {
           /* Since we are sure that the current buffer was empty
@@ -4378,11 +4349,11 @@ actually used.  */)
 
           if (inserted > 0 && ! NILP (Vset_auto_coding_function))
             {
-              val = call2 (Vset_auto_coding_function,
-                           filename, make_number (inserted));
+              coding_system = call2 (Vset_auto_coding_function,
+                                            filename, make_number (inserted));
             }
 
-          if (NILP (val))
+          if (NILP (coding_system))
             {
               /* If the coding system is not yet decided, check
                  file-coding-system-alist.  */
@@ -4392,66 +4363,70 @@ actually used.  */)
               args[2] = visit, args[3] = beg, args[4] = end, args[5] = Qnil;
               coding_systems = Ffind_operation_coding_system (6, args);
               if (CONSP (coding_systems))
-                val = XCAR (coding_systems);
+                coding_system = XCAR (coding_systems);
             }
 
           unbind_to (count, Qnil);
           inserted = Z_BYTE - BEG_BYTE;
         }
 
-      /* The following kludgy code is to avoid some compiler bug.
-         We can't simply do
-         setup_coding_system (val, &coding);
-         on some system.  */
-      {
-        struct coding_system temp_coding;
-        setup_coding_system (val, &temp_coding);
-        bcopy (&temp_coding, &coding, sizeof coding);
-      }
-      /* Ensure we set Vlast_coding_system_used.  */
-      set_coding_system = 1;
+      if (NILP (coding_system))
+        coding_system = Qundecided;
+      else
+        CHECK_CODING_SYSTEM (coding_system);
 
-      if (NILP (current_buffer->enable_multibyte_characters)
-          && ! NILP (val))
+      if (NILP (current_buffer->enable_multibyte_characters))
         /* We must suppress all character code conversion except for
            end-of-line conversion.  */
-        setup_raw_text_coding_system (&coding);
-      coding.src_multibyte = 0;
-      coding.dst_multibyte
-        = !NILP (current_buffer->enable_multibyte_characters);
-    }
+        coding_system = raw_text_coding_system (coding_system);
 
-  if (!NILP (visit)
-      /* Can't do this if part of the buffer might be preserved.  */
-      && NILP (replace)
-      && (coding.type == coding_type_no_conversion
-          || coding.type == coding_type_raw_text))
-    {
-      /* Visiting a file with these coding system makes the buffer
-         unibyte. */
-      current_buffer->enable_multibyte_characters = Qnil;
-      coding.dst_multibyte = 0;
+      setup_coding_system (coding_system, &coding);
+      /* Ensure we set Vlast_coding_system_used.  */
+      set_coding_system = 1;
     }
 
-  if (inserted > 0 || coding.type == coding_type_ccl)
+  if (!NILP (visit))
     {
-      if (CODING_MAY_REQUIRE_DECODING (&coding))
+      /* When we visit a file by raw-text, we change the buffer to
+         unibyte.  If we have not yet decided how to decode a text,
+         decide it at first by detecting the file's encoding.  */
+      if (CODING_REQUIRE_DETECTION (&coding))
         {
-          code_convert_region (PT, PT_BYTE, PT + inserted, PT_BYTE + inserted,
-                               &coding, 0, 0);
-          inserted = coding.produced_char;
+          coding_system = detect_coding_system (PT_ADDR, inserted, 1, 0,
+                                                coding_system);
+          setup_coding_system (coding_system, &coding);
         }
-      else
-        adjust_after_insert (PT, PT_BYTE, PT + inserted, PT_BYTE + inserted,
-                             inserted);
+
+      if (CODING_FOR_UNIBYTE (&coding)
+          /* Can't do this if part of the buffer might be preserved.  */
+          && NILP (replace))
+        /* Visiting a file with these coding system makes the buffer
+           unibyte. */
+        current_buffer->enable_multibyte_characters = Qnil;
+    }
+
+  if (CODING_REQUIRE_DETECTION (&coding)
+      || CODING_REQUIRE_DECODING (&coding))
+    {
+      move_gap_both (PT, PT_BYTE);
+      GAP_SIZE += inserted;
+      ZV_BYTE -= inserted;
+      Z_BYTE -= inserted;
+      ZV -= inserted;
+      Z -= inserted;
+      decode_coding_gap (&coding, inserted, inserted);
+      inserted = coding.produced_char;
     }
+  else if (inserted > 0)
+    adjust_after_insert (PT, PT_BYTE, PT + inserted, PT_BYTE + inserted,
+                         inserted);
 
 #ifdef DOS_NT
   /* Use the conversion type to determine buffer-file-type
      (find-buffer-file-type is now used to help determine the
      conversion).  */
-  if ((coding.eol_type == CODING_EOL_UNDECIDED 
-       || coding.eol_type == CODING_EOL_LF)
+  if ((coding.eol_type == eol_type_undecided 
+       || coding.eol_type == eol_type_lf)
       && ! CODING_REQUIRE_DECODING (&coding))
     current_buffer->buffer_file_type = Qt;
   else
@@ -4515,7 +4490,7 @@ actually used.  */)
     }
 
   if (set_coding_system)
-    Vlast_coding_system_used = coding.symbol;
+    Vlast_coding_system_used = coding_system;
 
   /* Call after-change hooks for the inserted text, aside from the case
      of normal visiting (not with REPLACE), which is done in a new buffer
@@ -4560,8 +4535,6 @@ actually used.  */)
 }
 
 static Lisp_Object build_annotations P_ ((Lisp_Object, Lisp_Object));
-static Lisp_Object build_annotations_2 P_ ((Lisp_Object, Lisp_Object,
-                                            Lisp_Object, Lisp_Object));
 
 /* If build_annotations switched buffers, switch back to BUF.
    Kill the temporary buffer that was selected in the meantime.
@@ -4643,40 +4616,36 @@ choose_write_coding_system (start, end, filename,
           using_default_coding = 1;
         }
             
+      if (! NILP (val) && ! force_raw_text)
+        {
+          Lisp_Object spec, attrs;
+
+          CHECK_CODING_SYSTEM_GET_SPEC (val, spec);
+          attrs = AREF (spec, 0);
+          if (EQ (CODING_ATTR_TYPE (attrs), Qraw_text))
+            force_raw_text = 1;
+        }
+
       if (!force_raw_text
           && !NILP (Ffboundp (Vselect_safe_coding_system_function)))
         /* Confirm that VAL can surely encode the current region.  */
         val = call3 (Vselect_safe_coding_system_function, start, end, val);
 
-      setup_coding_system (Fcheck_coding_system (val), coding);
-      if (coding->eol_type == CODING_EOL_UNDECIDED
-          && !using_default_coding)
-        {
-          if (! EQ (default_buffer_file_coding.symbol,
-                    buffer_defaults.buffer_file_coding_system))
-            setup_coding_system (buffer_defaults.buffer_file_coding_system,
-                                 &default_buffer_file_coding);
-          if (default_buffer_file_coding.eol_type != CODING_EOL_UNDECIDED)
-            {
-              Lisp_Object subsidiaries;
-
-              coding->eol_type = default_buffer_file_coding.eol_type;
-              subsidiaries = Fget (coding->symbol, Qeol_type);
-              if (VECTORP (subsidiaries)
-                  && XVECTOR (subsidiaries)->size == 3)
-                coding->symbol
-                  = XVECTOR (subsidiaries)->contents[coding->eol_type];
-            }
-        }
+      /* If the decided coding-system doesn't specify end-of-line
+         format, we use that of
+         `default-buffer-file-coding-system'.  */
+      if (! using_default_coding)
+        val = (coding_inherit_eol_type
+               (val, buffer_defaults.buffer_file_coding_system));
 
+      /* If we decide not to encode text, use `raw-text' or one of its
+         subsidiaries.  */
       if (force_raw_text)
-        setup_raw_text_coding_system (coding);
-      goto done_setup_coding;
+        val = raw_text_coding_system (val);
     }
 
   setup_coding_system (Fcheck_coding_system (val), coding);
 
- done_setup_coding:
   if (!STRINGP (start) && !NILP (current_buffer->selective_display))
     coding->mode |= CODING_MODE_SELECTIVE_DISPLAY;
 }
@@ -4816,11 +4785,9 @@ This does code conversion according to the value of
      unsavable chars (as was the case with X-Symbol).  */
   choose_write_coding_system (start, end, filename,
                               append, visit, lockname, &coding);
-  Vlast_coding_system_used = coding.symbol;
+  Vlast_coding_system_used = CODING_ID_NAME (coding.id);
 
   given_buffer = current_buffer;
-  annotations = build_annotations_2 (start, end,
-                                     coding.pre_write_conversion, annotations);
   if (current_buffer != given_buffer)
     {
       XSETFASTINT (start, BEGV);
@@ -4963,6 +4930,9 @@ This does code conversion according to the value of
   if (GPT > BEG && GPT_ADDR[-1] != '\n')
     move_gap (find_next_newline (GPT, 1));
 #else
+#if 0
+  /* The new encoding routine doesn't require the following.  */
+
   /* Whether VMS or not, we must move the gap to the next of newline
      when we must put designation sequences at beginning of line.  */
   if (INTEGERP (start)
@@ -4976,6 +4946,7 @@ This does code conversion according to the value of
       SET_PT_BOTH (opoint, opoint_byte);
     }
 #endif
+#endif
 
   failure = 0;
   immediate_quit = 1;
@@ -4988,23 +4959,10 @@ This does code conversion according to the value of
     }
   else if (XINT (start) != XINT (end))
     {
-      tem = CHAR_TO_BYTE (XINT (start));
-
-      if (XINT (start) < GPT)
-        {
-          failure = 0 > a_write (desc, Qnil, XINT (start),
-                                 min (GPT, XINT (end)) - XINT (start),
-                                 &annotations, &coding);
-          save_errno = errno;
-        }
-
-      if (XINT (end) > GPT && !failure)
-        {
-          tem = max (XINT (start), GPT);
-          failure = 0 > a_write (desc, Qnil, tem , XINT (end) - tem,
-                                 &annotations, &coding);
-          save_errno = errno;
-        }
+      failure = 0 > a_write (desc, Qnil,
+                             XINT (start), XINT (end) - XINT (start),
+                             &annotations, &coding);
+      save_errno = errno;
     }
   else
     {
@@ -5020,7 +4978,7 @@ This does code conversion according to the value of
     {
       /* We have to flush out a data. */
       coding.mode |= CODING_MODE_LAST_BLOCK;
-      failure = 0 > e_write (desc, Qnil, 0, 0, &coding);
+      failure = 0 > e_write (desc, Qnil, 1, 1, &coding);
       save_errno = errno;
     }
 
@@ -5196,30 +5154,6 @@ build_annotations (start, end)
   return annotations;
 }
 
-static Lisp_Object
-build_annotations_2 (start, end, pre_write_conversion, annotations)
-     Lisp_Object start, end, pre_write_conversion, annotations;
-{
-  struct gcpro gcpro1;
-  Lisp_Object res;
-
-  GCPRO1 (annotations);
-  /* At last, do the same for the function PRE_WRITE_CONVERSION
-     implied by the current coding-system.  */
-  if (!NILP (pre_write_conversion))
-    {
-      struct buffer *given_buffer = current_buffer;
-      Vwrite_region_annotations_so_far = annotations;
-      res = call2 (pre_write_conversion, start, end);
-      Flength (res);
-      annotations = (current_buffer != given_buffer
-                     ? res
-                     : merge (annotations, res, Qcar_less_than_car));
-    }
-
-  UNGCPRO;
-  return annotations;
-}
 
 /* Write to descriptor DESC the NCHARS chars starting at POS of STRING.
    If STRING is nil, POS is the character position in the current buffer.
@@ -5291,76 +5225,45 @@ e_write (desc, string, start, end, coding)
      int start, end;
      struct coding_system *coding;
 {
-  register char *addr;
-  register int nbytes;
-  char buf[WRITE_BUF_SIZE];
   int return_val = 0;
 
-  if (start >= end)
-    coding->composing = COMPOSITION_DISABLED;
-  if (coding->composing != COMPOSITION_DISABLED)
-    coding_save_composition (coding, start, end, string);
-
   if (STRINGP (string))
     {
-      addr = XSTRING (string)->data;
-      nbytes = STRING_BYTES (XSTRING (string));
-      coding->src_multibyte = STRING_MULTIBYTE (string);
-    }
-  else if (start < end)
-    {
-      /* It is assured that the gap is not in the range START and END-1.  */
-      addr = CHAR_POS_ADDR (start);
-      nbytes = CHAR_TO_BYTE (end) - CHAR_TO_BYTE (start);
-      coding->src_multibyte
-        = !NILP (current_buffer->enable_multibyte_characters);
-    }
-  else
-    {
-      addr = "";
-      nbytes = 0;
-      coding->src_multibyte = 1;
+      start = 0;
+      end = XSTRING (string)->size;
     }
 
+  coding->mode |= CODING_MODE_FIXED_DESTINATION;
+  if (! NILP (current_buffer->selective_display))
+    coding->mode |= CODING_MODE_SELECTIVE_DISPLAY;
+
   /* We used to have a code for handling selective display here.  But,
      now it is handled within encode_coding.  */
-  while (1)
+  do
     {
-      int result;
+      if (STRINGP (string))
+        encode_coding_object (coding, string,
+                              start, string_char_to_byte (string, start),
+                              end, string_char_to_byte (string, end), Qt);
+      else
+        encode_coding_object (coding, Fcurrent_buffer (),
+                              start, CHAR_TO_BYTE (start),
+                              end, CHAR_TO_BYTE (end), Qt);
 
-      result = encode_coding (coding, addr, buf, nbytes, WRITE_BUF_SIZE);
       if (coding->produced > 0)
         {
-          coding->produced -= emacs_write (desc, buf, coding->produced);
+          coding->produced -= emacs_write (desc,
+                                           XSTRING (coding->dst_object)->data,
+                                           coding->produced);
           if (coding->produced)
             {
               return_val = -1;
               break;
             }
         }
-      nbytes -= coding->consumed;
-      addr += coding->consumed;
-      if (result == CODING_FINISH_INSUFFICIENT_SRC
-          && nbytes > 0)
-        {
-          /* The source text ends by an incomplete multibyte form.
-             There's no way other than write it out as is.  */
-          nbytes -= emacs_write (desc, addr, nbytes);
-          if (nbytes)
-            {
-              return_val = -1;
-              break;
-            }
-        }
-      if (nbytes <= 0)
-        break;
       start += coding->consumed_char;
-      if (coding->cmp_data)
-        coding_adjust_composition_offset (coding, start);
     }
-
-  if (coding->cmp_data)
-    coding_free_composition_data (coding);
+  while (start < end);
 
   return return_val;
 }