+DEFUN ("get-byte", Fget_byte, Sget_byte, 0, 2, 0,
+ doc: /* Return a byte value of a character at point.
+Optional 1st arg POSITION, if non-nil, is a position of a character to get
+a byte value.
+Optional 2nd arg STRING, if non-nil, is a string of which first
+character is a target to get a byte value. In this case, POSITION, if
+non-nil, is an index of a target character in the string.
+
+If the current buffer (or STRING) is multibyte, and the target
+character is not ASCII nor 8-bit character, an error is signalled. */)
+ (position, string)
+ Lisp_Object position, string;
+{
+ int c;
+ EMACS_INT pos;
+ unsigned char *p;
+
+ if (NILP (string))
+ {
+ if (NILP (position))
+ {
+ p = PT_ADDR;
+ }
+ else
+ {
+ CHECK_NUMBER_COERCE_MARKER (position);
+ if (XINT (position) < BEGV || XINT (position) >= ZV)
+ args_out_of_range_3 (position, make_number (BEGV), make_number (ZV));
+ pos = XFASTINT (position);
+ p = CHAR_POS_ADDR (pos);
+ }
+ if (NILP (current_buffer->enable_multibyte_characters))
+ return make_number (*p);
+ }
+ else
+ {
+ CHECK_STRING (string);
+ if (NILP (position))
+ {
+ p = SDATA (string);
+ }
+ else
+ {
+ CHECK_NATNUM (position);
+ if (XINT (position) >= SCHARS (string))
+ args_out_of_range (string, position);
+ pos = XFASTINT (position);
+ p = SDATA (string) + string_char_to_byte (string, pos);
+ }
+ if (! STRING_MULTIBYTE (string))
+ return make_number (*p);
+ }
+ c = STRING_CHAR (p);
+ if (CHAR_BYTE8_P (c))
+ c = CHAR_TO_BYTE8 (c);
+ else if (! ASCII_CHAR_P (c))
+ error ("Not an ASCII nor an 8-bit character: %d", c);
+ return make_number (c);
+}
+
+
HCoop / bpt / emacs.git / blobdiff