Coding system support cleanup and minor refactoring.

* coding.h (enum coding_result_code): Remove
CODING_RESULT_INCONSISTENT_EOL and CODING_RESULT_INSUFFICIENT_MEM.
(toplevel): Remove unused CODING_MODE_INHIBIT_INCONSISTENT_EOL.
(CODING_MODE_LAST_BLOCK, CODING_MODE_SELECTIVE_DISPLAY)
(CODING_MODE_DIRECTION, CODING_MODE_FIXED_DESTINATION)
(CODING_MODE_SAFE_ENCODING): Rearrange bit values.
(decode_coding_region, encode_coding_region, decode_coding_string):
Remove unused compatibility macros.
* coding.c (Qinconsistent_eol, Qinsufficient_memory): Remove.
(record_conversion_result): Adjust user.
(syms_of_coding): Likewise.
(ALLOC_CONVERSION_WORK_AREA): Use SAFE_ALLOCA.
(decode_coding, encode_coding): Add USE_SAFE_ALLOCA and SAFE_FREE.
(decode_coding_object): Simplify since xrealloc never returns NULL.
Add eassert.

1 files changed, 6 insertions, 28 deletions

diff --git a/src/coding.h b/src/coding.h
index eb95fa13ddb..28a7d776b63 100644
--- a/src/coding.h
+++ b/src/coding.h
@@ -272,37 +272,31 @@ enum coding_result_code
     CODING_RESULT_SUCCESS,
     CODING_RESULT_INSUFFICIENT_SRC,
     CODING_RESULT_INSUFFICIENT_DST,
-    CODING_RESULT_INCONSISTENT_EOL,
     CODING_RESULT_INVALID_SRC,
-    CODING_RESULT_INTERRUPT,
-    CODING_RESULT_INSUFFICIENT_MEM
+    CODING_RESULT_INTERRUPT
   };
 
 
 /* Macros used for the member `mode' of the struct coding_system.  */
 
-/* If set, recover the original CR or LF of the already decoded text
-   when the decoding routine encounters an inconsistent eol format.  */
-#define CODING_MODE_INHIBIT_INCONSISTENT_EOL    0x01
-
 /* If set, the decoding/encoding routines treat the current data as
    the last block of the whole text to be converted, and do the
    appropriate finishing job.  */
-#define CODING_MODE_LAST_BLOCK                  0x02
+#define CODING_MODE_LAST_BLOCK                  0x01
 
 /* If set, it means that the current source text is in a buffer which
    enables selective display.  */
-#define CODING_MODE_SELECTIVE_DISPLAY           0x04
+#define CODING_MODE_SELECTIVE_DISPLAY           0x02
 
 /* This flag is used by the decoding/encoding routines on the fly.  If
    set, it means that right-to-left text is being processed.  */
-#define CODING_MODE_DIRECTION                   0x08
+#define CODING_MODE_DIRECTION                   0x04
 
-#define CODING_MODE_FIXED_DESTINATION           0x10
+#define CODING_MODE_FIXED_DESTINATION           0x08
 
 /* If set, it means that the encoding routines produces some safe
    ASCII characters (usually '?') for unsupported characters.  */
-#define CODING_MODE_SAFE_ENCODING               0x20
+#define CODING_MODE_SAFE_ENCODING               0x10
 
   /* For handling composition sequence.  */
 #include "composite.h"
@@ -725,22 +719,6 @@ extern Lisp_Object from_unicode (Lisp_Object str);
 
 /* Macros for backward compatibility.  */
 
-#define decode_coding_region(coding, from, to)          \
-  decode_coding_object (coding, Fcurrent_buffer (),     \
-                        from, CHAR_TO_BYTE (from),      \
-                        to, CHAR_TO_BYTE (to), Fcurrent_buffer ())
-
-
-#define encode_coding_region(coding, from, to)          \
-  encode_coding_object (coding, Fcurrent_buffer (),     \
-                        from, CHAR_TO_BYTE (from),      \
-                        to, CHAR_TO_BYTE (to), Fcurrent_buffer ())
-
-
-#define decode_coding_string(coding, string, nocopy)                    \
-  decode_coding_object (coding, string, 0, 0, SCHARS (string),          \
-                        SBYTES (string), Qt)
-
 #define encode_coding_string(coding, string, nocopy)                    \
   (STRING_MULTIBYTE(string) ?                                           \
     (encode_coding_object (coding, string, 0, 0, SCHARS (string),       \