From: Daniel Liu Date: Sat, 19 Jun 2021 18:16:33 +0000 (-0400) Subject: abstract func out X-Git-Url: https://git.danieliu.xyz/?a=commitdiff_plain;h=fb894149783dd18e6ecf1271153193a342e80433;p=sped.git abstract func out --- diff --git a/fileutils.S b/fileutils.S new file mode 100644 index 0000000..178bca4 --- /dev/null +++ b/fileutils.S @@ -0,0 +1,7 @@ + +%ifndef __FILEUTILS_S__ +%define __FILEUTILS_S__ + +extern readFile + +%endif diff --git a/fileutils.asm b/fileutils.asm new file mode 100644 index 0000000..1d96aa0 --- /dev/null +++ b/fileutils.asm @@ -0,0 +1,191 @@ + +extern printf +extern malloc +extern realloc +extern free +extern memset + +global readFile + +section .data + wrongfile_str db `unable to open file, error code: %i\n`, 0x00 + +section .text + +; reads file line by line +; args: filename +; return: +; eax - pointer to mem +; ecx - lines read +readFile: + %define _FILE_NAME 8 + %define FILE_HANDLE 4 + %define IS_EOF 8 + %define LINES_READ 12 + %define BUF_PTR 16 ; malloced array of strings + + push ebp + mov ebp, esp + + ; allocate vars + sub esp, 16 + mov DWORD [ebp-FILE_HANDLE], 0x00 + mov DWORD [ebp-IS_EOF], 0x00 + mov DWORD [ebp-LINES_READ], 0x00 + + push 0 + call malloc + mov [ebp-BUF_PTR], eax + + ; open existing file + mov eax, 5 + mov ebx, [ebp+_FILE_NAME] + mov ecx, 0 + mov edx, 0777 + int 0x80 + mov [ebp-FILE_HANDLE], eax + + ; check if file was open successfully + cmp eax, 0 + jge _readFile_loop + push eax + push wrongfile_str + call printf + jmp _readFile_exit + + _readFile_loop: + + ; check if eof was reached + cmp DWORD [ebp-IS_EOF], 1 + je _readFile_exit + + push DWORD [ebp-FILE_HANDLE] + call readLine + + mov esi, eax + mov [ebp-IS_EOF], ebx + + push esi + call printf + + ; make string buffer bigger + mov eax, DWORD [ebp-LINES_READ] + add eax, 1 + mov ecx, 4 + mul ecx + push eax + push DWORD [ebp-BUF_PTR] + call realloc + mov DWORD [ebp-BUF_PTR], eax + + ; write string to buffer + mov eax, DWORD [ebp-BUF_PTR] + mov ecx, 4 + mul ecx + mov eax, esi + + add DWORD [ebp-LINES_READ], 1 + + jmp _readFile_loop + + _readFile_exit: + ; close file + mov eax, 6 + mov ebx, [ebp-FILE_HANDLE] + int 0x80 + + mov eax, [ebp-BUF_PTR] + mov ecx, [ebp-LINES_READ] + + %undef _FILE_NAME + %undef FILE_HANDLE + %undef IS_EOF + %undef LINES_READ + %undef BUF_PTR + + mov esp, ebp + pop ebp + ret + + +; reads a line until newline character is reached +; args: file_handle +; return: +; eax: location to buffer +; ebx: contains eof +readLine: + %define _FILE_HANDLE 8 + %define CHAR_COUNT 4 ; count number of characters read + %define BLOCK_COUNT 8 ; number of 64 blocks we've read + %define STR_PTR 12 ; malloced buffer to store read string + + push ebp + mov ebp, esp + + ; allocate vars + sub esp, 12 + mov DWORD [ebp-CHAR_COUNT], 0x00 + mov DWORD [ebp-BLOCK_COUNT], 0x00 + + push 64 + call malloc + mov [ebp-STR_PTR], eax + + push DWORD [ebp-STR_PTR] + push 0x00 + push 64 + + _readLine_loop: + ; if buffer is full + cmp BYTE [ebp-CHAR_COUNT], 63 ; leave one byte for null byte + jne _readLine_notfull + jmp _readLine_exit + + _readLine_notfull: + ; read a single character + mov eax, 3 + mov ebx, [ebp+_FILE_HANDLE] + mov ecx, [ebp-STR_PTR] + add ecx, [ebp-CHAR_COUNT] + mov edx, 1 + int 0x80 + + ; mov eax, 4 + ; mov ebx, 1 + ; mov ecx, [ebp-STR_PTR] + ; add ecx, [ebp-CHAR_COUNT] + ; mov edx, 1 + ; int 0x80 + + ; check for eof + cmp eax, 0 ; eax has zero on eof + jne _readLine_not_eof + mov ebx, 1 + jmp _readLine_exit + _readLine_not_eof: + + ; check for newline + mov eax, [ebp-STR_PTR] + add eax, [ebp-CHAR_COUNT] + cmp DWORD [eax], 0x0a + jne _readLine_not_newline + mov ebx, 0 + jmp _readLine_exit + _readLine_not_newline: + + add DWORD [ebp-CHAR_COUNT], 1 + jmp _readLine_loop + + _readLine_exit: + + mov eax, DWORD [ebp-STR_PTR] + + %undef _FILE_HANDLE + %undef CHAR_COUNT + %undef BLOCK_COUNT + %undef STR_PTR + + mov esp, ebp + pop ebp + ret + diff --git a/makefile b/makefile index d031d20..82074cf 100644 --- a/makefile +++ b/makefile @@ -1,17 +1,17 @@ CC=gcc CFLAGS=-m32 -no-pie ASM=nasm -ASMFLAGS=-f elf32 -g -F dwarf +ASMFLAGS=-f elf32 -g .PHONY: clean make: sped -sped.o: sped.asm - $(ASM) $(ASMFLAGS) -g $^ -o $@ +%.o: %.asm + $(ASM) $(ASMFLAGS) -o $@ $^ -sped: sped.o - $(CC) $(CFLAGS) $^ -o $@ +sped: sped.o fileutils.o + $(CC) $(CFLAGS) -o $@ $^ clean: rm sped *.o diff --git a/sped.asm b/sped.asm index 21d1910..110bf98 100644 --- a/sped.asm +++ b/sped.asm @@ -1,30 +1,14 @@ ; sped - the stupidly pointless editor ; written by pinosaur +%include "fileutils.S" + global main extern printf -extern malloc -extern realloc -extern free -extern memset - -; macros -%macro write_str 2 - mov eax, 4 - mov ebx, 1 - mov ecx, %1 - mov edx, %2 - int 0x80 -%endmacro section .data banner_str db `SPED - the stupidly pointless editor\n`, 0x00 - readfile_str db `reading file %s\n`, 0x00 nofile_str db `no file provided\n`, 0x00 - argcount_str db `there are %d args\n`, 0x00 - wrongfile_str db `unable to open file, error code: %i\n`, 0x00 - char_str db `read this char: %i\n`, 0x00 - printfint_str db `int: %i\n`, 0x00 section .text main: @@ -47,11 +31,8 @@ main: _main_existing: mov ebx, DWORD [ebp+_ARGV] - add ebx, 4 + add ebx, 4 ; first user arg is filename push DWORD [ebx] - ; push readfile_str - ; call printf - call readFile mov eax, 0 @@ -65,178 +46,3 @@ main: pop ebp ret - -; reads file line by line -; args: filename -; return: -; eax - pointer to mem -; ecx - lines read -readFile: - %define _FILE_NAME 8 - %define FILE_HANDLE 4 - %define IS_EOF 8 - %define LINES_READ 12 - %define BUF_PTR 16 ; malloced array of strings - - push ebp - mov ebp, esp - - ; allocate vars - sub esp, 16 - mov DWORD [ebp-FILE_HANDLE], 0x00 - mov DWORD [ebp-IS_EOF], 0x00 - mov DWORD [ebp-LINES_READ], 0x00 - - push 0 - call malloc - mov [ebp-BUF_PTR], eax - - ; open existing file - mov eax, 5 - mov ebx, [ebp+_FILE_NAME] - mov ecx, 0 - mov edx, 0777 - int 0x80 - mov [ebp-FILE_HANDLE], eax - - ; check if file was open successfully - cmp eax, 0 - jge _readFile_loop - push eax - push wrongfile_str - call printf - jmp _readFile_exit - - _readFile_loop: - - ; check if eof was reached - cmp DWORD [ebp-IS_EOF], 1 - je _readFile_exit - - push DWORD [ebp-FILE_HANDLE] - call readLine - - mov esi, eax - mov [ebp-IS_EOF], ebx - - push esi - call printf - - ; make string buffer bigger - mov eax, DWORD [ebp-LINES_READ] - add eax, 1 - mov ecx, 4 - mul ecx - push eax - push DWORD [ebp-BUF_PTR] - call realloc - mov DWORD [ebp-BUF_PTR], eax - - ; write string to buffer - mov eax, DWORD [ebp-BUF_PTR] - mov ecx, 4 - mul ecx - mov eax, esi - - add DWORD [ebp-LINES_READ], 1 - - jmp _readFile_loop - - _readFile_exit: - ; close file - mov eax, 6 - mov ebx, [ebp-FILE_HANDLE] - int 0x80 - - %undef _FILE_NAME - %undef FILE_HANDLE - %undef IS_EOF - %undef LINES_READ - %undef BUF_PTR - - mov esp, ebp - pop ebp - ret - - -; reads a line until newline character is reached -; args: file_handle -; return: -; eax: location to buffer -; ebx: contains eof -readLine: - %define _FILE_HANDLE 8 - %define CHAR_COUNT 4 ; count number of characters read - %define BLOCK_COUNT 8 ; number of 64 blocks we've read - %define STR_PTR 12 ; malloced buffer to store read string - - push ebp - mov ebp, esp - - ; allocate vars - sub esp, 12 - mov DWORD [ebp-CHAR_COUNT], 0x00 - mov DWORD [ebp-BLOCK_COUNT], 0x00 - - push 64 - call malloc - mov [ebp-STR_PTR], eax - - push DWORD [ebp-STR_PTR] - push 0x00 - push 64 - - _readLine_loop: - ; if buffer is full - cmp BYTE [ebp-CHAR_COUNT], 63 ; leave one byte for null byte - jne _readLine_notfull - jmp _readLine_exit - - _readLine_notfull: - ; read a single character - mov eax, 3 - mov ebx, [ebp+_FILE_HANDLE] - mov ecx, [ebp-STR_PTR] - add ecx, [ebp-CHAR_COUNT] - mov edx, 1 - int 0x80 - - ; mov eax, 4 - ; mov ebx, 1 - ; mov ecx, [ebp-STR_PTR] - ; add ecx, [ebp-CHAR_COUNT] - ; mov edx, 1 - ; int 0x80 - - ; check for eof - cmp eax, 0 ; eax has zero on eof - jne _readLine_not_eof - mov ebx, 1 - jmp _readLine_exit - _readLine_not_eof: - - ; check for newline - mov eax, [ebp-STR_PTR] - add eax, [ebp-CHAR_COUNT] - cmp DWORD [eax], 0x0a - jne _readLine_not_newline - mov ebx, 0 - jmp _readLine_exit - _readLine_not_newline: - - add DWORD [ebp-CHAR_COUNT], 1 - jmp _readLine_loop - - _readLine_exit: - - mov eax, DWORD [ebp-STR_PTR] - - %undef _FILE_HANDLE - %undef CHAR_COUNT - %undef BLOCK_COUNT - %undef STR_PTR - - mov esp, ebp - pop ebp - ret -