diff options
Diffstat (limited to '04a')
| -rw-r--r-- | 04a/in03 | 322 | ||||
| -rw-r--r-- | 04a/in04 | 0 |
2 files changed, 0 insertions, 322 deletions
diff --git a/04a/in03 b/04a/in03 deleted file mode 100644 index ed965e6..0000000 --- a/04a/in03 +++ /dev/null @@ -1,322 +0,0 @@ -I=8S -A=d3 -?I!A:usage_error -; open input file - J=S - ; argv[1] is at *(rsp+16) - J+=d16 - J=8J - I=d0 - syscall x2 - J=A - ?J<0:input_file_error -; open output file - J=S - ; argv[2] is at *(rsp+24) - J+=d24 - J=8J - I=x241 - D=x1ed - syscall x2 - J=A - ?J<0:output_file_error -; initialize :definitions_end -J=:definitions_end -D=:definitions -8J=D - -:read_line -; use rbp to store line pointer -R=:line -:read_line_loop - ; read 1 byte into rbp - J=d3 - I=R - D=d1 - syscall x0 - D=A - ?D=0:eof - - ; check if the character was a newline: - C=1R - D=xa - ?C=D:read_line_loop_end - R+=d1 - !:read_line_loop -:read_line_loop_end - -; check if line = "#define " up to a terminator of ' '. -C=x20 -I=:#define -J=:line -call :string= -D=A -?D!0:handle_#define - -; handle a normal line -; R will store a pointer to the current character -R=:line -:process_line_loop - C=1R - B=C - call :isident - ?A!0:process_ident - ; if *R is not an identifier character, just output it to the file. - J=d4 - B=C - call :fputc - ; check if we reached the end of the line - C=1R - D=xa - ?C=D:read_line - ; increment R, keep looping - R+=d1 - !:process_line_loop - :process_ident - ; if *R is an ident char. look up this identifier in :definitions. - ; use C to keep pointer to definition - C=:definitions - :lookup_loop - D=1C - ; check if we reached end of definition table - ?D=0:lookup_loop_end - ; check if this entry matches our identifier - I=R - J=C - call :ident= - ?A!0:perform_substitution - ; if not, skip over this entry - :skip_definition_loop - D=1C - I=xa - C+=d1 - ?I!D:skip_definition_loop - !:lookup_loop - :lookup_loop_end - ; this identifier doesn't match anything in the definitions table; just write it. - ; first, figure out how long it is - J=R - :length_loop - C=1J - B=C - call :isident - ?A=0:length_loop_end - J+=d1 - !:length_loop - :length_loop_end - ; now write it. - I=R - R=J - J-=I - D=J - J=d4 - syscall x1 - ; keep looping - !:process_line_loop - -:perform_substitution - ; right now, I is a pointer to the end of the identifier in :line, - ; and J is a pointer to the end of the identifier in :definitions. - - ; advance :line pointer for next loop iteration - R=I - - J+=d1 - ; J now points to the definition. let's write it - I=J - :definition_end_loop - C=1I - D=xa - ?C=D:definition_end_loop_end - I+=d1 - !:definition_end_loop - :definition_end_loop_end - D=I - D-=J - I=J - J=d4 - syscall x1 - ; process the rest of this line - !:process_line_loop - -:eof - J=d0 - syscall x3c - -; can the character in rbx appear in an identifier? -:isident - A='0 - ?B<A:return_0 - ; note: 58 = '9' + 1 - A=d58 - ?B<A:return_1 - A='A - ?B<A:return_0 - ; note: 91 = 'z' + 1 - A=d91 - ?B<A:return_1 - A='z - ?B>A:return_0 - ; 96 = 'a' - 1 - A=d96 - ?B>A:return_1 - A='_ - ?B=A:return_1 - !:return_0 - - -:handle_#define - J=:definitions_end - J=8J - ; start copy from after "#define" - I=:line - I+=d8 - - :#define_copy_loop - D=1I - 1J=D - I+=d1 - J+=d1 - A=xa - ?D=A:#define_copy_loop_end - !:#define_copy_loop - :#define_copy_loop_end - - ; update end of definitions - D=:definitions_end - 8D=J - ; emit newline so we don't screw up line numbers - J=d4 - I=:newline - D=d1 - syscall x1 - - !:read_line - -:newline - xa - - -:usage_error - B=:usage_error_message - call :error - -:usage_error_message - str Please provide an input and an output file. - xa - x0 - -:input_file_error - B=:input_file_error_message - !:error - -:input_file_error_message - str Couldn't open input file. - xa - x0 - -:output_file_error - B=:output_file_error_message - !:error - -:output_file_error_message - str Couldn't open output file. - xa - x0 - -:error - J=B - call :strlen - D=A - I=J - J=d2 - syscall x1 - J=d1 - syscall x3c - -:strlen - I=B - D=B - :strlen_loop - C=1I - ?C=0:strlen_ret - I+=d1 - !:strlen_loop - :strlen_ret - I-=D - A=I - return - -:#define - str #define - x20 - x0 - -; check if strings in rdi and rsi are equal, up to terminator in rcx -:string= - D=1I - A=1J - ?D!A:return_0 - ?D=C:return_1 - I+=d1 - J+=d1 - !:string= - -; check if strings in rdi and rsi are equal, up to the first non-identifier character -:ident= - D=1I - B=D - call :isident - ; I ended - ?A=0:ident=_I_end - - D=1J - B=D - call :isident - ; J ended, but I didn't - ?A=0:return_0 - - ; we haven't reached the end of either - D=1I - A=1J - ?D!A:return_0 - I+=d1 - J+=d1 - !:ident= -:ident=_I_end - D=1J - B=D - call :isident - ; check if J also ended - ?A=0:return_1 - ; J didn't end - !:return_0 - -:return_0 - A=d0 - return -:return_1 - A=d1 - return - -; write the character in rbx to the file in rdi. -:fputc - C=B - I=S - I-=d1 - 1I=C - D=d1 - syscall x1 - return - - -align -:definitions_end - reserve d8 -:line - reserve d1000 -:definitions - reserve d200000 - -; we shouldn't end the file with a reserve; we don't handle that properly -x00 diff --git a/04a/in04 b/04a/in04 new file mode 100644 index 0000000..e69de29 --- /dev/null +++ b/04a/in04 |