diff --git a/programs/develop/libraries/kolibri-libc/include/ctype.h b/programs/develop/libraries/kolibri-libc/include/ctype.h
index 5f87ebe292..5bec93e3f0 100644
--- a/programs/develop/libraries/kolibri-libc/include/ctype.h
+++ b/programs/develop/libraries/kolibri-libc/include/ctype.h
@@ -6,6 +6,8 @@
 ** dependable answers.
 */
 
+#include <stddef.h>
+
 #define __ALNUM     1
 #define __ALPHA     2
 #define __CNTRL     4
@@ -39,7 +41,7 @@ extern unsigned short *__is;
 #define isascii(c) (!((c)&(~0x7f)))
 #define toascii(c) ((c)&0x7f)
 
-extern unsigned char tolower(unsigned char c);
-extern unsigned char toupper(unsigned char c);
+extern int _FUNC(tolower)(int c);
+extern int _FUNC(toupper)(int c);
 
-#endif
\ No newline at end of file
+#endif
diff --git a/programs/develop/libraries/kolibri-libc/include/stdio.h b/programs/develop/libraries/kolibri-libc/include/stdio.h
index 097f42e21b..63e860522d 100644
--- a/programs/develop/libraries/kolibri-libc/include/stdio.h
+++ b/programs/develop/libraries/kolibri-libc/include/stdio.h
@@ -47,23 +47,17 @@ extern void _FUNC(debug_printf)(const char* format, ...);
 
 typedef size_t fpos_t;
 
-#define _STDIO_F_R 1 << 0 // Read
-#define _STDIO_F_W 1 << 1 // Write
-#define _STDIO_F_A 1 << 2 // Append
-#define _STDIO_F_X 1 << 3 // eXclusive
-#define _STDIO_F_B 1 << 4 // Binary
+#define _FILEMODE_R 1 << 0 // Read
+#define _FILEMODE_W 1 << 1 // Write
+#define _FILEMODE_A 1 << 2 // Append
 
 typedef struct FILE_s {
     char *name;
     fpos_t position;
     int error;
     int eof;
-    int kind; // 0 - undiefned, 1 - text, 2 - binary
-    int orientation; // 0 - undiefned, 1 - byte, 2 - wide
-    int mode; // flags _STDIO_F_*
-    int append_offset; // do not seek before this point ("a" mode)
+    int mode; // flags _FILEMODE_*
     int __ungetc_emu_buff; // Uses __ungetc_emu (temporary solution!)
-    int start_size;
 } FILE;
 
 #define _IOFBF 0
@@ -99,7 +93,7 @@ extern size_t _FUNC(fread)(void *restrict, size_t size, size_t count, FILE *rest
 extern int    _FUNC(fscanf)(FILE *restrict, const char *restrict, ...);
 extern size_t _FUNC(fwrite)(const void *restrict, size_t size, size_t count, FILE *restrict);
 extern int    _FUNC(getc)(FILE *);
-#define       getc _FUNC(fgetc)
+#define        getc() _FUNC(fgetc)(stdin)
 extern int    _FUNC(getchar)(void);
 extern int    _FUNC(printf)(const char *restrict, ...);
 extern int    _FUNC(putc)(int, FILE *);
diff --git a/programs/develop/libraries/kolibri-libc/include/sys/dirent.h b/programs/develop/libraries/kolibri-libc/include/sys/dirent.h
index 584adbea1c..04ea95033a 100644
--- a/programs/develop/libraries/kolibri-libc/include/sys/dirent.h
+++ b/programs/develop/libraries/kolibri-libc/include/sys/dirent.h
@@ -12,7 +12,7 @@
 typedef unsigned ino_t;
 
 struct dirent{
-   ino_t    d_ino;   //File serial number. 
+   ino_t    d_ino;               //File serial number. 
    char     d_name[PATH_MAX];   // Name of entry. 
    unsigned d_type;
 };
@@ -31,4 +31,4 @@ void _FUNC(rewinddir)(DIR *dir);
 void _FUNC(seekdir)(DIR *dir, unsigned pos);
 unsigned _FUNC(telldir)(DIR *dir);
 
-#endif // _DIRENT_H_
\ No newline at end of file
+#endif // _DIRENT_H_
diff --git a/programs/develop/libraries/kolibri-libc/include/sys/ksys.h b/programs/develop/libraries/kolibri-libc/include/sys/ksys.h
index c88df52c20..e7f90beb80 100644
--- a/programs/develop/libraries/kolibri-libc/include/sys/ksys.h
+++ b/programs/develop/libraries/kolibri-libc/include/sys/ksys.h
@@ -884,7 +884,12 @@ int _ksys_file_read_file(const char *name, unsigned long long offset, unsigned s
     k.p21 = name;
     int status;
     unsigned bytes_read_v;
-    _ksys_work_files(&k);
+    asm_inline(
+        "int $0x40"
+        :"=a"(status), "=b"(bytes_read_v)
+        :"a"(70), "b"(&k)
+        :"memory"
+    );
     if (!status) {
         *bytes_read = bytes_read_v;
     }
diff --git a/programs/develop/libraries/kolibri-libc/lib/libc.obj.a b/programs/develop/libraries/kolibri-libc/lib/libc.obj.a
index eef019ae87..633e3738b2 100644
Binary files a/programs/develop/libraries/kolibri-libc/lib/libc.obj.a and b/programs/develop/libraries/kolibri-libc/lib/libc.obj.a differ
diff --git a/programs/develop/libraries/kolibri-libc/samples/file_io.c b/programs/develop/libraries/kolibri-libc/samples/file_io.c
index 09597041f1..f1b97c1e99 100644
--- a/programs/develop/libraries/kolibri-libc/samples/file_io.c
+++ b/programs/develop/libraries/kolibri-libc/samples/file_io.c
@@ -1,43 +1,48 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+
+#define READ_MAX 255
+
+static char test_str1[] = "123454567890abcdefghijklmnopqrstufvwxyz";
+static char test_str2[READ_MAX];
 
 int main(int argc, char **argv)
 {
-
-  int i;
-  char c;
+  int i=0;
   FILE *f;
-  FILE *fin;
-  FILE *fout;
 
   //write to file
+  debug_printf("Write file...\n");
   f=fopen("testfile.txt","w");
 
-  for(i=0;i<50;i++)
-  {
-        fputc('1',f);
+  while(test_str1[i]!='a'){
+    fputc(test_str1[i],f);
+    i++;
   }
   fclose(f);
 
   //append to file
+  debug_printf("Apend file...\n");
   f=fopen("testfile.txt","a");
-
-  for(i=0;i<50;i++)
-  {
-      fputc('2',f);
-  }
+  fputs(test_str1+i,f);
+  char null_term = '\0';
+  fwrite(&null_term, sizeof(char), 1, f);
   fclose(f);
 
   //copy from testfile.txt to copyfile.txt
-
-  fin=fopen("testfile.txt","r");
-  fout=fopen("copyfile.txt","w");
-/*
-  while((c=fgetc(fin))!=EOF)
-  {
-        fputc(c,fout);
-  }*/
-  fclose(fin);
-  fclose(fout);
-
-}
\ No newline at end of file
+  debug_printf("Read file...\n");
+  f=fopen("testfile.txt","r");
+  i=0;
+  while((test_str2[i]=fgetc(f))!=EOF && i<READ_MAX){
+    fputc(test_str2[i], stdout);
+    i++;
+  }
+  printf("\n%s\n", test_str1);
+  if(!strcmp(test_str2, test_str1)){
+    puts("TEST: OK!");
+  }else{
+    puts("TEST: FAIL!");
+  }
+  fclose(f);
+}
diff --git a/programs/develop/libraries/kolibri-libc/source/ctype/tolower.c b/programs/develop/libraries/kolibri-libc/source/ctype/tolower.c
new file mode 100644
index 0000000000..b56f3c5094
--- /dev/null
+++ b/programs/develop/libraries/kolibri-libc/source/ctype/tolower.c
@@ -0,0 +1,7 @@
+#include <ctype.h>
+
+int tolower(int c)
+{
+	if (isupper(c)) return c | 32;
+	return c;
+}
diff --git a/programs/develop/libraries/kolibri-libc/source/ctype/toupper.c b/programs/develop/libraries/kolibri-libc/source/ctype/toupper.c
new file mode 100644
index 0000000000..1799f03077
--- /dev/null
+++ b/programs/develop/libraries/kolibri-libc/source/ctype/toupper.c
@@ -0,0 +1,7 @@
+#include <ctype.h>
+
+int toupper(int c)
+{
+	if (islower(c)) return c & 0x5f;
+	return c;
+}
diff --git a/programs/develop/libraries/kolibri-libc/source/libc.c b/programs/develop/libraries/kolibri-libc/source/libc.c
index d8d9326653..3e8d4ad953 100644
--- a/programs/develop/libraries/kolibri-libc/source/libc.c
+++ b/programs/develop/libraries/kolibri-libc/source/libc.c
@@ -1,4 +1,6 @@
 #include "ctype/is.c"
+#include "ctype/tolower.c" 
+#include "ctype/toupper.c"
 
 #include "sys/rewinddir.c"
 #include "sys/readdir.c"
@@ -49,6 +51,7 @@
 #include "stdio/rewind.c"
 #include "stdio/vfprintf.c"
 #include "stdio/fprintf.c"
+#include "stdio/ungetc.c"
 
 #include "string/strerror.c"
 #include "string/strxfrm.c"
diff --git a/programs/develop/libraries/kolibri-libc/source/stdio/fgetc.c b/programs/develop/libraries/kolibri-libc/source/stdio/fgetc.c
index 326539027b..7405ef4c11 100644
--- a/programs/develop/libraries/kolibri-libc/source/stdio/fgetc.c
+++ b/programs/develop/libraries/kolibri-libc/source/stdio/fgetc.c
@@ -2,8 +2,8 @@
 
 int fgetc(FILE* stream)
 {
-    int c=EOF;
-    if(fwrite(&c, sizeof(int), 1, stream)==1){
+    int c=0;
+    if(fread(&c, sizeof(char), 1, stream)==1){
         return c;
     }else{
         return EOF;
diff --git a/programs/develop/libraries/kolibri-libc/source/stdio/fputc.c b/programs/develop/libraries/kolibri-libc/source/stdio/fputc.c
index 0fe29f0c88..ddca544553 100644
--- a/programs/develop/libraries/kolibri-libc/source/stdio/fputc.c
+++ b/programs/develop/libraries/kolibri-libc/source/stdio/fputc.c
@@ -4,7 +4,7 @@
 
 int fputc(int c, FILE *stream)
 {
-    if(fwrite(&c, sizeof(int), 1, stream)==1){
+    if(fwrite(&c, sizeof(char), 1, stream)==1){
         return c;
     }else{
         return EOF;
diff --git a/programs/develop/libraries/kolibri-libc/source/stdio/fputs.c b/programs/develop/libraries/kolibri-libc/source/stdio/fputs.c
index f6488c8bbf..cc0926cb92 100644
--- a/programs/develop/libraries/kolibri-libc/source/stdio/fputs.c
+++ b/programs/develop/libraries/kolibri-libc/source/stdio/fputs.c
@@ -2,5 +2,10 @@
 #include <string.h>
 
 int fputs(const char *str, FILE *stream){
-    return fwrite(str, sizeof(char), strlen(str), stream);
+    size_t str_len = strlen(str);
+    if(str_len == fwrite(str, sizeof(char), str_len , stream)){
+        return str[str_len-1];
+    }else{
+        return EOF;
+    }
 }
\ No newline at end of file
diff --git a/programs/develop/libraries/kolibri-libc/source/stdio/fread.c b/programs/develop/libraries/kolibri-libc/source/stdio/fread.c
index 594b3ba561..ac0f75a1e5 100644
--- a/programs/develop/libraries/kolibri-libc/source/stdio/fread.c
+++ b/programs/develop/libraries/kolibri-libc/source/stdio/fread.c
@@ -8,20 +8,24 @@ size_t fread(void *restrict ptr, size_t size, size_t nmemb, FILE *restrict strea
 	unsigned bytes_count = size * nmemb;
 	
 	if(!stream){
-		errno = EINVAL;
+		errno = EBADF;
 		return 0;
 	}
 	
 	if(stream==stdin){
 		__con_init();
-		__con_gets((char*)ptr, bytes_count);
+		__con_gets((char*)ptr, bytes_count+1);
 		return nmemb;
 	}
 
 	else{
-		if(stream->mode != _STDIO_F_W){
+		if(stream->mode & _FILEMODE_R){
+			if(!stream->__ungetc_emu_buff){
+				((char*) ptr)[0]=(char)stream->__ungetc_emu_buff;
+				//debug_printf("Ungetc: %x\n", ((char*) ptr)[0]);
+			}
 			unsigned status = _ksys_file_read_file(stream->name, stream->position, bytes_count, ptr , &bytes_read);
-			if (status != KSYS_FS_ERR_SUCCESS) {
+			if (status) {
             	errno = EIO;
             	stream->error = errno;
 				return 0;
diff --git a/programs/develop/libraries/kolibri-libc/source/stdio/freopen.c b/programs/develop/libraries/kolibri-libc/source/stdio/freopen.c
index f5d25e623d..e8fde3144e 100644
--- a/programs/develop/libraries/kolibri-libc/source/stdio/freopen.c
+++ b/programs/develop/libraries/kolibri-libc/source/stdio/freopen.c
@@ -1,42 +1,53 @@
+#include "stddef.h"
 #include "sys/ksys.h"
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
+#define CREATE_FILE()   if(_ksys_file_create(_name)){ \
+                            errno= EIO; \
+                            free(out); \
+                            out = NULL; \
+                        }
+
 FILE *freopen(const char *restrict _name, const char *restrict _mode, FILE *restrict out) {
-    static ksys_bdfe_t info;
-    info.size=0;
-    if (!out) {
-        errno = ENOMEM;
+    if(!_name || !_mode || !out){
+        errno = EINVAL;
         return NULL;
     }
 
-    _ksys_file_get_info(_name, &info);
+    if (strchr(_mode, 'r')) { out->mode = _FILEMODE_R; }
+    if (strchr(_mode, 'a')) { out->mode = _FILEMODE_A; }
+    if (strchr(_mode, 'w')) { out->mode = _FILEMODE_W; }
 
+    ksys_bdfe_t info;
+    int no_file = _ksys_file_get_info(_name, &info);
+    out->eof=0;
+    out->error=0;
+    out->position=0;
     out->name = strdup(_name);
-    out->position = 0;
-    out->error = 0;
-    out->eof = 0;
-    out->kind = 0;
-    out->orientation = 0;
-    out->mode = 0;
-    out->start_size = info.size;
-
-    if (strchr(_mode, 'b')) { out->mode |= _STDIO_F_B; }
-    if (strchr(_mode, 'x')) { out->mode |= _STDIO_F_X; }
-    if (strchr(_mode, 'a')) { out->mode |= _STDIO_F_A; }
-    if (strchr(_mode, 'r')) { out->mode |= _STDIO_F_R; }
-    if (strchr(_mode, 'w')) { out->mode |= _STDIO_F_W; }
-    if (strchr(_mode, '+')) { out->mode |= _STDIO_F_R | _STDIO_F_W; }
-
-    if (out->mode & _STDIO_F_A) {
-        out->position = info.size;
-        out->append_offset = info.size;
-    } else if(out->mode & _STDIO_F_W){
-        if(_ksys_file_create(_name)){
-            return NULL;
+    
+    switch (out->mode) {
+    case _FILEMODE_A :
+        if(no_file){
+            CREATE_FILE();
         }
+        out->position = info.size;
+        break;
+    case _FILEMODE_W :
+        CREATE_FILE();
+        break;
+    case _FILEMODE_R :
+        if(no_file){
+            free(out);
+            out = NULL;
+        }
+        break;
+    default:
+        free(out);
+        out = NULL;
+        break;
     }
     return out;
-}
+}
\ No newline at end of file
diff --git a/programs/develop/libraries/kolibri-libc/source/stdio/fwrite.c b/programs/develop/libraries/kolibri-libc/source/stdio/fwrite.c
index 716e455d51..dbfb6c3066 100644
--- a/programs/develop/libraries/kolibri-libc/source/stdio/fwrite.c
+++ b/programs/develop/libraries/kolibri-libc/source/stdio/fwrite.c
@@ -9,7 +9,7 @@ size_t fwrite(const void *restrict ptr, size_t size, size_t nmemb, FILE *restric
 	unsigned bytes_count = size * nmemb;
 	
 	if(!stream){
-		errno = EINVAL;
+		errno = EBADF;
 		return 0;
 	}
 	
@@ -25,7 +25,7 @@ size_t fwrite(const void *restrict ptr, size_t size, size_t nmemb, FILE *restric
 		}
 	}
 	else{
-		if(stream->mode != _STDIO_F_R){
+		if(stream->mode != _FILEMODE_R){
 			unsigned status = _ksys_file_write_file(stream->name, stream->position, bytes_count, ptr, &bytes_written);
 			if (status != KSYS_FS_ERR_SUCCESS) {
             	errno = EIO;
diff --git a/programs/develop/libraries/kolibri-libc/source/stdio/getchar.c b/programs/develop/libraries/kolibri-libc/source/stdio/getchar.c
index 829ee18807..35c986a8f2 100644
--- a/programs/develop/libraries/kolibri-libc/source/stdio/getchar.c
+++ b/programs/develop/libraries/kolibri-libc/source/stdio/getchar.c
@@ -2,7 +2,9 @@
 #include "conio.h"
 
 int getchar(void) {
-	int c = __con_getch();
+	__con_init();
+	char c = 0;
+	__con_gets(&c, 2);
 	if (c == 0) {
 		c = EOF;
 	}
diff --git a/programs/develop/libraries/kolibri-libc/source/stdio/ungetc.c b/programs/develop/libraries/kolibri-libc/source/stdio/ungetc.c
index 40028b80bc..37ecacb0ed 100644
--- a/programs/develop/libraries/kolibri-libc/source/stdio/ungetc.c
+++ b/programs/develop/libraries/kolibri-libc/source/stdio/ungetc.c
@@ -11,12 +11,12 @@ int ungetc(int c, FILE* file)
         return EOF;
     }
 
-	if (file->mode != _STDIO_F_R){
+	if (file->mode != _FILEMODE_R){
         errno = EACCES;
         return EOF;
     }
 
-	if (file->position > file->start_size || file->position == 0 || c == EOF || file->__ungetc_emu_buff != EOF)
+	if (file->position == 0 || c == EOF)
 	{
 	    errno = EOF;
 		return EOF;
diff --git a/programs/develop/libraries/kolibri-libc/source/symbols.txt b/programs/develop/libraries/kolibri-libc/source/symbols.txt
index 662baf0a2f..6d7625b6d1 100644
--- a/programs/develop/libraries/kolibri-libc/source/symbols.txt
+++ b/programs/develop/libraries/kolibri-libc/source/symbols.txt
@@ -40,6 +40,7 @@ vprintf
 vfscanf
 vsnprintf
 vsscanf
+ungetc
 !____STDLIB____
 abs
 atoi
@@ -125,5 +126,7 @@ longjmp
 setjmp
 !____CTYPE____
 __is
+tolower
+toupper
 !___CONIO___
 con_set_title