Changed <stdio.h> to use open, close, read and write functions from libc instead of directly using them from liblinux (might make porting process easier)

src/stdio.c

@@ -1,5 +1,7 @@
 #include <stdio.h>
 #include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
 
 #define O_RDWR 2 // FIXME
 #define O_RDONLY 0
@@ -36,7 +38,7 @@ FILE* fopen(const char *restrict pathname, const char *restrict mode) { // FIXME
   default:
     return (FILE*)EINVAL;
   }
-  int fd = sys_open(pathname, oflag);
+  int fd = open(pathname, oflag);
   if (fd == -1)
     return NULL;
   FILE *temp = malloc(sizeof(pathname) + sizeof(fd));
@@ -46,12 +48,12 @@ FILE* fopen(const char *restrict pathname, const char *restrict mode) { // FIXME
 }
 
 int fclose(FILE *stream) {
-  return sys_close(stream->fd);
+  return close(stream->fd);
 }
 
 int fgetc(FILE *stream) {
   char buf = '\0';
-  sys_read(stream->fd, (void*)&buf, 1);
+  read(stream->fd, (void*)&buf, 1);
   return (buf == '\0') ? (unsigned int)-1 : (unsigned int)buf;
 }
 
@@ -68,7 +70,7 @@ char *fgets(char *restrict s, int n, FILE *restrict stream) {
 }
 
 int fputc(int c, FILE *stream) {
-  return (sys_write(stream->fd, &c, 1) == -1 ) ? -1 : c;
+  return (write(stream->fd, &c, 1) == -1 ) ? -1 : c;
 }
 
 int fputs(const char *restrict s, FILE *restrict stream) {
@@ -85,7 +87,7 @@ int rename(const char *old, const char *new) {
 }
 
 int putchar(int c) {
-  sys_write(stdout->fd, &c, 1);
+  write(stdout->fd, &c, 1);
   return (unsigned char)c;
 }