+; %include "utils.S"
+
extern printf
extern malloc
extern realloc
extern free
extern memset
+extern strlen
global readFile
global readLine
+global writeFile
section .data
wrongfile_str db `unable to open file, error code: %i\n`, 0x00
ret
; writes contents of string array into file
-; arg: filename, string array
-; writeFile:
+; arg: filename, string array, number of lines
+writeFile:
+
+ %define _FILE_NAME 16
+ %define _STR_ARR 12
+ %define _STR_ARR_LEN 8
+ %define FILE_HANDLE 4
+ %define LINES_WRITTEN 8
+
+ push ebp
+ mov ebp, esp
+
+ ; allocate vars
+ sub esp, 8
+ mov DWORD [ebp-FILE_HANDLE], 0x00
+ mov DWORD [ebp-LINES_WRITTEN], 0x00
+
+ ; open existing file
+ mov eax, 5
+ mov ebx, [ebp+_FILE_NAME]
+ mov ecx, 2
+ mov edx, 0777
+ int 0x80
+ mov [ebp-FILE_HANDLE], eax
+
+ ; check if file was open successfully
+ cmp eax, 0
+ jge _writeFile_loop
+ push eax
+ push wrongfile_str
+ call printf
+ jmp _writeFile_exit
+
+ _writeFile_loop:
+
+ ; check if we are done writing
+ mov eax, [ebp+_STR_ARR_LEN]
+ cmp eax, [ebp-LINES_WRITTEN]
+ je _writeFile_exit
+
+ ; get length of string to write
+ str_offset [ebp+_STR_ARR], [ebp-LINES_WRITTEN]
+ mov esi, eax
+ push DWORD [esi]
+ call strlen
+
+ mov edx, eax
+ mov eax, 4
+ mov ebx, [ebp-FILE_HANDLE]
+ mov ecx, [esi]
+ int 0x80
+
+ add DWORD [ebp-LINES_WRITTEN], 1
+
+ jmp _writeFile_loop
+
+ _writeFile_exit:
+
+ ; close file
+ mov eax, 6
+ mov ebx, [ebp-FILE_HANDLE]
+ int 0x80
+
+ %undef _FILE_NAME
+ %undef _STR_ARR
+ %undef _STR_ARR_LEN
+ %undef FILE_HANDLE
+
+ mov esp, ebp
+ pop ebp
+ ret
