text: #ifndef _STDIO_H
  #define _STDIO_H
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #include <features.h>
  
  #define __NEED_FILE
  #define __NEED___isoc_va_list
  #define __NEED_size_t
  
  #if __STDC_VERSION__ < 201112L
  #define __NEED_struct__IO_FILE
  #endif
  
  #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
   || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
   || defined(_BSD_SOURCE)
  #define __NEED_ssize_t
  #define __NEED_off_t
  #define __NEED_va_list
  #endif
  
  #include <bits/alltypes.h>
  
  #if __cplusplus >= 201103L
  #define NULL nullptr
  #elif defined(__cplusplus)
  #define NULL 0L
  #else
  #define NULL ((void*)0)
  #endif
  
  #undef EOF
  #define EOF (-1)
  
  #undef SEEK_SET
  #undef SEEK_CUR
  #undef SEEK_END
  #define SEEK_SET 0
  #define SEEK_CUR 1
  #define SEEK_END 2
  
  #define _IOFBF 0
  #define _IOLBF 1
  #define _IONBF 2
  
  #define BUFSIZ 1024
  #define FILENAME_MAX 4096
  #define FOPEN_MAX 1000
  #define TMP_MAX 10000
  #define L_tmpnam 20
  
  typedef union _G_fpos64_t {
  	char __opaque[16];
  	long long __lldata;
  	double __align;
  } fpos_t;
  
  extern FILE *const stdin;
  extern FILE *const stdout;
  extern FILE *const stderr;
  
  #define stdin  (stdin)
  #define stdout (stdout)
  #define stderr (stderr)
  
  FILE *fopen(const char *__restrict, const char *__restrict);
  FILE *freopen(const char *__restrict, const char *__restrict, FILE *__restrict);
  int fclose(FILE *);
  
  int remove(const char *);
  int rename(const char *, const char *);
  
  int feof(FILE *);
  int ferror(FILE *);
  int fflush(FILE *);
  void clearerr(FILE *);
  
  int fseek(FILE *, long, int);
  long ftell(FILE *);
  void rewind(FILE *);
  
  int fgetpos(FILE *__restrict, fpos_t *__restrict);
  int fsetpos(FILE *, const fpos_t *);
  
  size_t fread(void *__restrict, size_t, size_t, FILE *__restrict);
  size_t fwrite(const void *__restrict, size_t, size_t, FILE *__restrict);
  
  int fgetc(FILE *);
  int getc(FILE *);
  int getchar(void);
  int ungetc(int, FILE *);
  
  int fputc(int, FILE *);
  int putc(int, FILE *);
  int putchar(int);
  
  char *fgets(char *__restrict, int, FILE *__restrict);
  #if __STDC_VERSION__ < 201112L
  char *gets(char *);
  #endif
  
  int fputs(const char *__restrict, FILE *__restrict);
  int puts(const char *);
  
  int printf(const char *__restrict, ...);
  int fprintf(FILE *__restrict, const char *__restrict, ...);
  int sprintf(char *__restrict, const char *__restrict, ...);
  int snprintf(char *__restrict, size_t, const char *__restrict, ...);
  
  int vprintf(const char *__restrict, __isoc_va_list);
  int vfprintf(FILE *__restrict, const char *__restrict, __isoc_va_list);
  int vsprintf(char *__restrict, const char *__restrict, __isoc_va_list);
  int vsnprintf(char *__restrict, size_t, const char *__restrict, __isoc_va_list);
  
  int scanf(const char *__restrict, ...);
  int fscanf(FILE *__restrict, const char *__restrict, ...);
  int sscanf(const char *__restrict, const char *__restrict, ...);
  int vscanf(const char *__restrict, __isoc_va_list);
  int vfscanf(FILE *__restrict, const char *__restrict, __isoc_va_list);
  int vsscanf(const char *__restrict, const char *__restrict, __isoc_va_list);
  
  void perror(const char *);
  
  int setvbuf(FILE *__restrict, char *__restrict, int, size_t);
  void setbuf(FILE *__restrict, char *__restrict);
  
  char *tmpnam(char *);
  FILE *tmpfile(void);
  
  #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
   || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
   || defined(_BSD_SOURCE)
  FILE *fmemopen(void *__restrict, size_t, const char *__restrict);
  FILE *open_memstream(char **, size_t *);
  FILE *fdopen(int, const char *);
  FILE *popen(const char *, const char *);
  int pclose(FILE *);
  int fileno(FILE *);
  int fseeko(FILE *, off_t, int);
  off_t ftello(FILE *);
  int dprintf(int, const char *__restrict, ...);
  int vdprintf(int, const char *__restrict, __isoc_va_list);
  void flockfile(FILE *);
  int ftrylockfile(FILE *);
  void funlockfile(FILE *);
  int getc_unlocked(FILE *);
  int getchar_unlocked(void);
  int putc_unlocked(int, FILE *);
  int putchar_unlocked(int);
  ssize_t getdelim(char **__restrict, size_t *__restrict, int, FILE *__restrict);
  ssize_t getline(char **__restrict, size_t *__restrict, FILE *__restrict);
  int renameat(int, const char *, int, const char *);
  char *ctermid(char *);
  #define L_ctermid 20
  #endif
  
  
  #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
   || defined(_BSD_SOURCE)
  #define P_tmpdir "/tmp"
  char *tempnam(const char *, const char *);
  #endif
  
  #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
  #define L_cuserid 20
  char *cuserid(char *);
  void setlinebuf(FILE *);
  void setbuffer(FILE *, char *, size_t);
  int fgetc_unlocked(FILE *);
  int fputc_unlocked(int, FILE *);
  int fflush_unlocked(FILE *);
  size_t fread_unlocked(void *, size_t, size_t, FILE *);
  size_t fwrite_unlocked(const void *, size_t, size_t, FILE *);
  void clearerr_unlocked(FILE *);
  int feof_unlocked(FILE *);
  int ferror_unlocked(FILE *);
  int fileno_unlocked(FILE *);
  int getw(FILE *);
  int putw(int, FILE *);
  char *fgetln(FILE *, size_t *);
  int asprintf(char **, const char *, ...);
  int vasprintf(char **, const char *, __isoc_va_list);
  #endif
  
  #ifdef _GNU_SOURCE
  char *fgets_unlocked(char *, int, FILE *);
  int fputs_unlocked(const char *, FILE *);
  
  typedef ssize_t (cookie_read_function_t)(void *, char *, size_t);
  typedef ssize_t (cookie_write_function_t)(void *, const char *, size_t);
  typedef int (cookie_seek_function_t)(void *, off_t *, int);
  typedef int (cookie_close_function_t)(void *);
  
  typedef struct _IO_cookie_io_functions_t {
  	cookie_read_function_t *read;
  	cookie_write_function_t *write;
  	cookie_seek_function_t *seek;
  	cookie_close_function_t *close;
  } cookie_io_functions_t;
  
  FILE *fopencookie(void *, const char *, cookie_io_functions_t);
  #endif
  
  #if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
  #define tmpfile64 tmpfile
  #define fopen64 fopen
  #define freopen64 freopen
  #define fseeko64 fseeko
  #define ftello64 ftello
  #define fgetpos64 fgetpos
  #define fsetpos64 fsetpos
  #define fpos64_t fpos_t
  #define off64_t off_t
  #endif
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif
  