diff --git a/include/stdio.h b/include/stdio.h
index 939663d..6570ba0 100755
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -11,14 +11,41 @@
 #ifndef _STDIO_H
 #define _STDIO_H
 
+#ifdef _XOPEN_SOURCE
+#ifdef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+#endif
+#endif
+
 #include <sys/cdefs.h>
 
+#ifndef NULL
+#define NULL ((void *) 0)
+#endif
+
 #include <types/size_t.h>
 #include <types/ssize_t.h>
 #include <types/off_t.h>
 
+#ifdef _POSIX_C_SOURCE
+#include <types/ssize_t.h>
+#endif
+
+#include <stdarg.h>
+
 typedef unsigned long int fpos_t;
 
+typedef struct _FILE_STRUCT {
+  fpos_t position; /* Current position in file */
+  int fildes; /* The file's file descriptor */
+  int rw; /* Is it read-only or read-write? */
+  int errind; /* Have we got an error? */
+  int eofind; /* Have we reached EOF? */
+  char * buffer; /* The file's buffer */
+  int buf_size; /* The size of the file's buffer */
+  int buf_mode; /* How is the file buffered? (_IOFBF, etc.) */
+} FILE;
+
 #define EOF (-1)
 
 #define _IOFBF 01 /* IO fully buffered */
@@ -29,12 +56,87 @@ typedef unsigned long int fpos_t;
 #define SEEK_END 02 /* Seek relative to end of file */
 #define SEEK_SET 04 /* Seek relative to start of file */
 
-int printf(const char * __restrict, ...);
+#define BUFSIZ 1024
+#define FILENAME_MAX 4096
+#define FOPEN_MAX 1024
+#define L_tmpnam 512
+#define TMP_MAX 65536
+#ifdef _POSIX_C_SOURCE
+#define L_ctermid 1024
+#endif
 
+extern const FILE * stdin;
+extern const FILE * stdout;
+extern const FILE * stderr;
+
+#define stdin (stdin)
+#define stdout (stdout)
+#define stderr (stderr)
+
+/* Operations on files (ISO C Std. 7.19.4) */
+int remove(const char *);
+int rename(const char *, const char *);
+
+FILE * tmpfile(void);
+char * tmpnam(char *);
+
+/* File access functions (ISO C Std. 7.19.5) */
+int fclose(FILE *);
+int fflush(FILE *);
+FILE * fopen(const char * restrict, const char * restrict);
+FILE * freopen(const char * restrict, const char * restrict, FILE * restrict);
+
+void setbuf(FILE * restrict, char * restrict);
+int setvbuf(FILE * restrict, char * restrict, int, size_t);
+
+/* Formatted IO functions (ISO C Std. 7.19.6) */
+int fprintf(FILE * restrict, const char * restrict, ...);
+int printf(const char * restrict, ...);
+int sprintf(char * restrict, const char * restrict, ...);
+int snprintf(char * restrict, size_t n, const char * restrict, ...);
+int vfprintf(FILE * restrict, const char * restrict, va_list);
+int vprintf(const char * restrict, va_list);
+int vsnprintf(char * restrict, size_t n, const char * restrict, va_list);
+int vsprintf(char * restrict, const char * restrict, va_list);
+
+int fscanf(FILE * restrict, const char * restrict, ...);
+int scanf(const char * restrict, ...);
+int sscanf(const char * restrict, const char * restrict, ...);
+int vfscanf(FILE * restrict, const char * restrict, va_list);
+int vscanf(const char * restrict, va_list);
+int vsscanf(const char * restrict, const char * restrict, va_list);
+
+/* Character IO functions (ISO C Std. 7.19.7) */
+int fgetc(FILE *);
+int fgets(char * restrict, int, FILE * restrict);
+int fputc(int, FILE *);
+int fputs(const char * restrict, FILE * restrict);
+
+#define getc(stream) fgetc(stream)
+int getchar(void);
+char * gets(char *);
+int putc(int, FILE *);
 int putchar(int);
-
 int puts(const char *);
 
+int ungetc(int, FILE *);
+
+/* Direct IO functions (ISO C Std. 7.19.8) */
+size_t fread(void * restrict, size_t, size_t, FILE * restrict);
+size_t fwrite(const void * restrict, size_t, size_t, FILE * restrict);
+
+/* File positioning functions (ISO C Std. 7.19.9) */
+int fgetpos(FILE * restrict, fpos_t * restrict);
+int fseek(FILE *, long int, int);
+int fsetpos(FILE *, const fpos_t *);
+long int ftell(FILE *);
+void rewind(FILE *);
+
+/* Error-handling functions (ISO C Std. 7.19.10) */
+void clearerr(FILE *);
+int feof(FILE *);
+int ferror(FILE *);
+
 void perror(const char *);
 
 #endif