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?? cpu-set.h(4.41 KB)
?? dirent.h(1.73 KB)
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?? endian.h(176 B)
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?? errno.h(1.39 KB)
?? error.h(2.62 KB)
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?? fcntl-linux.h(13.39 KB)
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?? fenv.h(4.5 KB)
?? fenvinline.h(190 B)
?? floatn-common.h(9.54 KB)
?? floatn.h(4.27 KB)
?? flt-eval-method.h(1.19 KB)
?? fp-fast.h(1.19 KB)
?? fp-logb.h(1011 B)
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?? getopt_posix.h(1.77 KB)
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?? indirect-return.h(1.55 KB)
?? initspin.h(25 B)
?? inotify.h(1.05 KB)
?? ioctl-types.h(2.4 KB)
?? ioctls.h(4.37 KB)
?? ipc.h(2.02 KB)
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?? libc-header-start.h(2.55 KB)
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?? link.h(4.18 KB)
?? link_lavcurrent.h(1.07 KB)
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?? locale.h(1.33 KB)
?? long-double.h(923 B)
?? math-finite.h(5.25 KB)
?? math-vector.h(2.25 KB)
?? mathcalls-helper-functions.h(1.72 KB)
?? mathcalls-narrow.h(1.28 KB)
?? mathcalls.h(12.79 KB)
?? mathdef.h(890 B)
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?? netdb.h(1.23 KB)
?? param.h(1.4 KB)
?? poll.h(2.03 KB)
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?? posix1_lim.h(5.07 KB)
?? posix2_lim.h(2.8 KB)
?? posix_opt.h(5.63 KB)
?? printf-ldbl.h(991 B)
?? pthreadtypes-arch.h(3.21 KB)
?? pthreadtypes.h(3 KB)
?? ptrace-shared.h(2.83 KB)
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?? signum-generic.h(4.24 KB)
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?? sockaddr.h(1.48 KB)
?? socket.h(15.2 KB)
?? socket2.h(2.96 KB)
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?? ss_flags.h(1.16 KB)
?? stab.def(8.83 KB)
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?? stdio.h(5.46 KB)
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?? stdlib-ldbl.h(1.34 KB)
?? stdlib.h(4.95 KB)
?? string_fortified.h(4.57 KB)
?? strings_fortified.h(1.21 KB)
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?? termios.h(5.24 KB)
?? thread-shared-types.h(6.58 KB)
?? time.h(2.93 KB)
?? timerfd.h(1.08 KB)
?? timex.h(4.49 KB)
?? types
?? types.h(8.14 KB)
?? typesizes.h(3.32 KB)
?? uintn-identity.h(1.5 KB)
?? uio-ext.h(1.88 KB)
?? uio_lim.h(1.35 KB)
?? unistd.h(10.56 KB)
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?? waitstatus.h(2.23 KB)
?? wchar-ldbl.h(2.37 KB)
?? wchar.h(1.86 KB)
?? wchar2.h(17.79 KB)
?? wctype-wchar.h(6.15 KB)
?? wordsize.h(442 B)
?? xopen_lim.h(3.77 KB)

Editing: stdio.h

/* Optimizing macros and inline functions for stdio functions.
   Copyright (C) 1998-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _BITS_STDIO_H
#define _BITS_STDIO_H 1

#ifndef _STDIO_H
# error "Never include <bits/stdio.h> directly; use <stdio.h> instead."
#endif

#ifndef __extern_inline
# define __STDIO_INLINE inline
#else
# define __STDIO_INLINE __extern_inline
#endif

#ifdef __USE_EXTERN_INLINES
/* For -D_FORTIFY_SOURCE{,=2,=3} bits/stdio2.h will define a different
   inline.  */
# if !(__USE_FORTIFY_LEVEL > 0 && defined __fortify_function)
/* Write formatted output to stdout from argument list ARG.  */
__STDIO_INLINE int
vprintf (const char *__restrict __fmt, __gnuc_va_list __arg)
{
  return vfprintf (stdout, __fmt, __arg);
}
# endif

/* Read a character from stdin.  */
__STDIO_INLINE int
getchar (void)
{
  return getc (stdin);
}

# ifdef __USE_MISC
/* Faster version when locking is not necessary.  */
__STDIO_INLINE int
fgetc_unlocked (FILE *__fp)
{
  return __getc_unlocked_body (__fp);
}
# endif /* misc */

# ifdef __USE_POSIX
/* This is defined in POSIX.1:1996.  */
__STDIO_INLINE int
getc_unlocked (FILE *__fp)
{
  return __getc_unlocked_body (__fp);
}

/* This is defined in POSIX.1:1996.  */
__STDIO_INLINE int
getchar_unlocked (void)
{
  return __getc_unlocked_body (stdin);
}
# endif	/* POSIX */

/* Write a character to stdout.  */
__STDIO_INLINE int
putchar (int __c)
{
  return putc (__c, stdout);
}

# ifdef __USE_MISC
/* Faster version when locking is not necessary.  */
__STDIO_INLINE int
fputc_unlocked (int __c, FILE *__stream)
{
  return __putc_unlocked_body (__c, __stream);
}
# endif /* misc */

# ifdef __USE_POSIX
/* This is defined in POSIX.1:1996.  */
__STDIO_INLINE int
putc_unlocked (int __c, FILE *__stream)
{
  return __putc_unlocked_body (__c, __stream);
}

/* This is defined in POSIX.1:1996.  */
__STDIO_INLINE int
putchar_unlocked (int __c)
{
  return __putc_unlocked_body (__c, stdout);
}
# endif	/* POSIX */

# ifdef	__USE_GNU
/* Like `getdelim', but reads up to a newline.  */
__STDIO_INLINE __ssize_t
getline (char **__lineptr, size_t *__n, FILE *__stream)
{
  return __getdelim (__lineptr, __n, '\n', __stream);
}
# endif /* GNU */

# ifdef __USE_MISC
/* Faster versions when locking is not required.  */
__STDIO_INLINE int
__NTH (feof_unlocked (FILE *__stream))
{
  return __feof_unlocked_body (__stream);
}

/* Faster versions when locking is not required.  */
__STDIO_INLINE int
__NTH (ferror_unlocked (FILE *__stream))
{
  return __ferror_unlocked_body (__stream);
}
# endif /* misc */

#endif /* Use extern inlines.  */

#if defined __USE_MISC && defined __GNUC__ && defined __OPTIMIZE__ \
    && !defined __cplusplus
/* Perform some simple optimizations.  */
# define fread_unlocked(ptr, size, n, stream) \
  (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n)    \
		   && (size_t) (size) * (size_t) (n) <= 8		      \
		   && (size_t) (size) != 0)				      \
		  ? ({ char *__ptr = (char *) (ptr);			      \
		       FILE *__stream = (stream);			      \
		       size_t __cnt;					      \
		       for (__cnt = (size_t) (size) * (size_t) (n);	      \
			    __cnt > 0; --__cnt)				      \
			 {						      \
			   int __c = getc_unlocked (__stream);		      \
			   if (__c == EOF)				      \
			     break;					      \
			   *__ptr++ = __c;				      \
			 }						      \
		       ((size_t) (size) * (size_t) (n) - __cnt)		      \
			/ (size_t) (size); })				      \
		  : (((__builtin_constant_p (size) && (size_t) (size) == 0)   \
		      || (__builtin_constant_p (n) && (size_t) (n) == 0))     \
			/* Evaluate all parameters once.  */		      \
		     ? ((void) (ptr), (void) (stream), (void) (size),	      \
			(void) (n), (size_t) 0)				      \
		     : fread_unlocked (ptr, size, n, stream))))

# define fwrite_unlocked(ptr, size, n, stream) \
  (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n)    \
		   && (size_t) (size) * (size_t) (n) <= 8		      \
		   && (size_t) (size) != 0)				      \
		  ? ({ const char *__ptr = (const char *) (ptr);	      \
		       FILE *__stream = (stream);			      \
		       size_t __cnt;					      \
		       for (__cnt = (size_t) (size) * (size_t) (n);	      \
			    __cnt > 0; --__cnt)				      \
			 if (putc_unlocked (*__ptr++, __stream) == EOF)	      \
			   break;					      \
		       ((size_t) (size) * (size_t) (n) - __cnt)		      \
			/ (size_t) (size); })				      \
		  : (((__builtin_constant_p (size) && (size_t) (size) == 0)   \
		      || (__builtin_constant_p (n) && (size_t) (n) == 0))     \
			/* Evaluate all parameters once.  */		      \
		     ? ((void) (ptr), (void) (stream), (void) (size),	      \
			(void) (n), (size_t) 0)				      \
		     : fwrite_unlocked (ptr, size, n, stream))))
#endif

/* Define helper macro.  */
#undef __STDIO_INLINE

#endif /* bits/stdio.h.  */

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Editing: stdio.h

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