#ifdef emacs
+/* Information about which coding system is safe for which chars.
+ The value has the form (GENERIC-LIST . NON-GENERIC-ALIST).
+
+ GENERIC-LIST is a list of generic coding systems which can encode
+ any characters.
+
+ NON-GENERIC-ALIST is an alist of non generic coding systems vs the
+ corresponding char table that contains safe chars. */
+Lisp_Object Vcoding_system_safe_chars;
+
Lisp_Object Vcoding_system_list, Vcoding_system_alist;
Lisp_Object Qcoding_system_p, Qcoding_system_error;
Lisp_Object Vchar_coding_system_table;
Lisp_Object Qchar_coding_system;
-/* Return `safe-chars' property of coding system CODING. Don't check
- validity of CODING. */
+/* Return `safe-chars' property of CODING_SYSTEM (symbol). Don't check
+ its validity. */
Lisp_Object
-coding_safe_chars (coding)
- struct coding_system *coding;
+coding_safe_chars (coding_system)
+ Lisp_Object coding_system;
{
Lisp_Object coding_spec, plist, safe_chars;
- coding_spec = Fget (coding->symbol, Qcoding_system);
+ coding_spec = Fget (coding_system, Qcoding_system);
plist = XVECTOR (coding_spec)->contents[3];
safe_chars = Fplist_get (XVECTOR (coding_spec)->contents[3], Qsafe_chars);
return (CHAR_TABLE_P (safe_chars) ? safe_chars : Qt);
#define CHARSET_OK(idx, charset, c) \
(coding_system_table[idx] \
&& (charset == CHARSET_ASCII \
- || (safe_chars = coding_safe_chars (coding_system_table[idx]), \
+ || (safe_chars = coding_safe_chars (coding_system_table[idx]->symbol), \
CODING_SAFE_CHAR_P (safe_chars, c))) \
&& (CODING_SPEC_ISO_REQUESTED_DESIGNATION (coding_system_table[idx], \
charset) \
Lisp_Object translation_table;
Lisp_Object safe_chars;
- safe_chars = coding_safe_chars (coding);
+ safe_chars = coding_safe_chars (coding->symbol);
if (NILP (Venable_character_translation))
translation_table = Qnil;
Lisp_Object translation_table;
Lisp_Object safe_chars;
- safe_chars = coding_safe_chars (coding);
+ safe_chars = coding_safe_chars (coding->symbol);
if (NILP (Venable_character_translation))
translation_table = Qnil;
}
+static Lisp_Object
+find_safe_codings_2 (p, pend, safe_codings, work_table, single_byte_char_found)
+ unsigned char *p, *pend;
+ Lisp_Object safe_codings, work_table;
+ int *single_byte_char_found;
+{
+ int c, len, i;
+ Lisp_Object val, ch;
+ Lisp_Object prev, tail;
+
+ while (p < pend)
+ {
+ c = STRING_CHAR_AND_LENGTH (p, pend - p, len);
+ p += len;
+ if (ASCII_BYTE_P (c))
+ /* We can ignore ASCII characters here. */
+ continue;
+ if (SINGLE_BYTE_CHAR_P (c))
+ *single_byte_char_found = 1;
+ if (NILP (safe_codings))
+ /* Already all coding systems are excluded. */
+ continue;
+ /* Check the safe coding systems for C. */
+ ch = make_number (c);
+ val = Faref (work_table, ch);
+ if (EQ (val, Qt))
+ /* This element was already checked. Ignore it. */
+ continue;
+ /* Remember that we checked this element. */
+ Faset (work_table, ch, Qt);
+
+ for (prev = tail = safe_codings; CONSP (tail); tail = XCDR (tail))
+ {
+ val = XCAR (tail);
+ if (NILP (Faref (XCDR (val), ch)))
+ {
+ /* Exclued this coding system from SAFE_CODINGS. */
+ if (EQ (tail, safe_codings))
+ safe_codings = XCDR (safe_codings);
+ else
+ XSETCDR (prev, XCDR (tail));
+ }
+ else
+ prev = tail;
+ }
+ }
+ return safe_codings;
+}
+
+DEFUN ("find-coding-systems-region-internal-2",
+ Ffind_coding_systems_region_internal_2,
+ Sfind_coding_systems_region_internal_2, 2, 2, 0,
+ doc: /* Internal use only. */)
+ (start, end)
+ Lisp_Object start, end;
+{
+ Lisp_Object work_table, safe_codings;
+ int non_ascii_p = 0;
+ int single_byte_char_found = 0;
+ const unsigned char *p1, *p1end, *p2, *p2end, *p;
+
+ if (STRINGP (start))
+ {
+ if (!STRING_MULTIBYTE (start))
+ return Qt;
+ p1 = SDATA (start), p1end = p1 + SBYTES (start);
+ p2 = p2end = p1end;
+ if (SCHARS (start) != SBYTES (start))
+ non_ascii_p = 1;
+ }
+ else
+ {
+ int from, to, stop;
+
+ CHECK_NUMBER_COERCE_MARKER (start);
+ CHECK_NUMBER_COERCE_MARKER (end);
+ if (XINT (start) < BEG || XINT (end) > Z || XINT (start) > XINT (end))
+ args_out_of_range (start, end);
+ if (NILP (current_buffer->enable_multibyte_characters))
+ return Qt;
+ from = CHAR_TO_BYTE (XINT (start));
+ to = CHAR_TO_BYTE (XINT (end));
+ stop = from < GPT_BYTE && GPT_BYTE < to ? GPT_BYTE : to;
+ p1 = BYTE_POS_ADDR (from), p1end = p1 + (stop - from);
+ if (stop == to)
+ p2 = p2end = p1end;
+ else
+ p2 = BYTE_POS_ADDR (stop), p2end = p2 + (to - stop);
+ if (XINT (end) - XINT (start) != to - from)
+ non_ascii_p = 1;
+ }
+
+ if (!non_ascii_p)
+ {
+ /* We are sure that the text contains no multibyte character.
+ Check if it contains eight-bit-graphic. */
+ p = p1;
+ for (p = p1; p < p1end && ASCII_BYTE_P (*p); p++);
+ if (p == p1end)
+ {
+ for (p = p2; p < p2end && ASCII_BYTE_P (*p); p++);
+ if (p == p2end)
+ return Qt;
+ }
+ }
+
+ /* The text contains non-ASCII characters. */
+
+ work_table = Fmake_char_table (Qchar_coding_system, Qnil);
+ safe_codings = Fcopy_sequence (XCDR (Vcoding_system_safe_chars));
+
+ safe_codings = find_safe_codings_2 (p1, p1end, safe_codings, work_table,
+ &single_byte_char_found);
+ if (p2 < p2end)
+ safe_codings = find_safe_codings_2 (p2, p2end, safe_codings, work_table,
+ &single_byte_char_found);
+ if (EQ (safe_codings, XCDR (Vcoding_system_safe_chars)))
+ safe_codings = Qt;
+ else
+ {
+ /* Turn safe_codings to a list of coding systems... */
+ Lisp_Object val;
+
+ if (single_byte_char_found)
+ /* ... and append these for eight-bit chars. */
+ val = Fcons (Qraw_text,
+ Fcons (Qemacs_mule, Fcons (Qno_conversion, Qnil)));
+ else
+ /* ... and append generic coding systems. */
+ val = Fcopy_sequence (XCAR (Vcoding_system_safe_chars));
+
+ for (; CONSP (safe_codings); safe_codings = XCDR (safe_codings))
+ val = Fcons (XCAR (XCAR (safe_codings)), val);
+ safe_codings = val;
+ }
+
+ return safe_codings;
+}
+
+
/* Search from position POS for such characters that are unencodable
accoding to SAFE_CHARS, and return a list of their positions. P
points where in the memory the character at POS exists. Limit the
if (coding.type == coding_type_undecided)
safe_chars = Qnil;
else
- safe_chars = coding_safe_chars (&coding);
+ safe_chars = coding_safe_chars (coding_system);
if (STRINGP (string)
|| from >= GPT || to <= GPT)
return Qnil;
}
+DEFUN ("define-coding-system-internal", Fdefine_coding_system_internal,
+ Sdefine_coding_system_internal, 1, 1, 0,
+ doc: /* Register CODING-SYSTEM as a base coding system.
+This function is internal use only. */)
+ (coding_system)
+ Lisp_Object coding_system;
+{
+ Lisp_Object safe_chars, slot;
+
+ if (NILP (Fcheck_coding_system (coding_system)))
+ Fsignal (Qcoding_system_error, Fcons (coding_system, Qnil));
+ safe_chars = coding_safe_chars (coding_system);
+ if (! EQ (safe_chars, Qt) && ! CHAR_TABLE_P (safe_chars))
+ error ("No valid safe-chars property for %s",
+ SDATA (SYMBOL_NAME (coding_system)));
+ if (EQ (safe_chars, Qt))
+ {
+ if (NILP (Fmemq (coding_system, XCAR (Vcoding_system_safe_chars))))
+ XSETCAR (Vcoding_system_safe_chars,
+ Fcons (coding_system, XCAR (Vcoding_system_safe_chars)));
+ }
+ else
+ {
+ slot = Fassq (coding_system, XCDR (Vcoding_system_safe_chars));
+ if (NILP (slot))
+ XSETCDR (Vcoding_system_safe_chars,
+ nconc2 (XCDR (Vcoding_system_safe_chars),
+ Fcons (Fcons (coding_system, safe_chars), Qnil)));
+ else
+ XSETCDR (slot, safe_chars);
+ }
+ return Qnil;
+}
+
#endif /* emacs */
\f
}
}
+ Vcoding_system_safe_chars = Fcons (Qnil, Qnil);
+ staticpro (&Vcoding_system_safe_chars);
+
Qtranslation_table = intern ("translation-table");
staticpro (&Qtranslation_table);
Fput (Qtranslation_table, Qchar_table_extra_slots, make_number (1));
defsubr (&Sdetect_coding_region);
defsubr (&Sdetect_coding_string);
defsubr (&Sfind_coding_systems_region_internal);
+ defsubr (&Sfind_coding_systems_region_internal_2);
defsubr (&Sunencodable_char_position);
defsubr (&Sdecode_coding_region);
defsubr (&Sencode_coding_region);
defsubr (&Sfind_operation_coding_system);
defsubr (&Supdate_coding_systems_internal);
defsubr (&Sset_coding_priority_internal);
+ defsubr (&Sdefine_coding_system_internal);
DEFVAR_LISP ("coding-system-list", &Vcoding_system_list,
doc: /* List of coding systems.
DEFVAR_BOOL ("coding-system-require-warning",
&coding_system_require_warning,
doc: /* Internal use only.
-If non-nil, on writing a file, select-safe-coding-system-function is
-called even if coding-system-for-write is non-nil. The command
-universal-coding-system-argument binds this variable to t temporarily. */);
+If non-nil, on writing a file, `select-safe-coding-system-function' is
+called even if `coding-system-for-write' is non-nil. The command
+`universal-coding-system-argument' binds this variable to t temporarily. */);
coding_system_require_warning = 0;
projects / emacs.git / commitdiff