1/* Optimizing macros and inline functions for stdio functions.
2   Copyright (C) 1998, 2000, 2001, 2004, 2007 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public
7   License as published by the Free Software Foundation; either
8   version 2.1 of the License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, write to the Free
17   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18   02111-1307 USA.  */
19
20#ifndef _STDIO_H
21# error "Never include <bits/stdio.h> directly; use <stdio.h> instead."
22#endif
23
24#ifndef __extern_inline
25# define __STDIO_INLINE inline
26#else
27# define __STDIO_INLINE __extern_inline
28#endif
29
30
31#ifdef __USE_EXTERN_INLINES
32/* For -D_FORTIFY_SOURCE{,=2} bits/stdio2.h will define a different
33   inline.  */
34# if !(__USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline)
35/* Write formatted output to stdout from argument list ARG.  */
36__STDIO_INLINE int
37vprintf (__const char *__restrict __fmt, _G_va_list __arg)
38{
39  return vfprintf (stdout, __fmt, __arg);
40}
41# endif
42
43/* Read a character from stdin.  */
44__STDIO_INLINE int
45getchar (void)
46{
47  return _IO_getc (stdin);
48}
49
50
51# ifdef __USE_MISC
52/* Faster version when locking is not necessary.  */
53__STDIO_INLINE int
54fgetc_unlocked (FILE *__fp)
55{
56  return _IO_getc_unlocked (__fp);
57}
58# endif /* misc */
59
60
61# if defined __USE_POSIX || defined __USE_MISC
62/* This is defined in POSIX.1:1996.  */
63__STDIO_INLINE int
64getc_unlocked (FILE *__fp)
65{
66  return _IO_getc_unlocked (__fp);
67}
68
69/* This is defined in POSIX.1:1996.  */
70__STDIO_INLINE int
71getchar_unlocked (void)
72{
73  return _IO_getc_unlocked (stdin);
74}
75# endif	/* POSIX || misc */
76
77
78/* Write a character to stdout.  */
79__STDIO_INLINE int
80putchar (int __c)
81{
82  return _IO_putc (__c, stdout);
83}
84
85
86# ifdef __USE_MISC
87/* Faster version when locking is not necessary.  */
88__STDIO_INLINE int
89fputc_unlocked (int __c, FILE *__stream)
90{
91  return _IO_putc_unlocked (__c, __stream);
92}
93# endif /* misc */
94
95
96# if defined __USE_POSIX || defined __USE_MISC
97/* This is defined in POSIX.1:1996.  */
98__STDIO_INLINE int
99putc_unlocked (int __c, FILE *__stream)
100{
101  return _IO_putc_unlocked (__c, __stream);
102}
103
104/* This is defined in POSIX.1:1996.  */
105__STDIO_INLINE int
106putchar_unlocked (int __c)
107{
108  return _IO_putc_unlocked (__c, stdout);
109}
110# endif	/* POSIX || misc */
111
112
113# ifdef	__USE_GNU
114/* Like `getdelim', but reads up to a newline.  */
115__STDIO_INLINE _IO_ssize_t
116getline (char **__lineptr, size_t *__n, FILE *__stream)
117{
118  return __getdelim (__lineptr, __n, '\n', __stream);
119}
120# endif /* GNU */
121
122
123# ifdef __USE_MISC
124/* Faster versions when locking is not required.  */
125__STDIO_INLINE int
126__NTH (feof_unlocked (FILE *__stream))
127{
128  return _IO_feof_unlocked (__stream);
129}
130
131/* Faster versions when locking is not required.  */
132__STDIO_INLINE int
133__NTH (ferror_unlocked (FILE *__stream))
134{
135  return _IO_ferror_unlocked (__stream);
136}
137# endif /* misc */
138
139#endif /* Use extern inlines.  */
140
141
142#if defined __USE_MISC && defined __GNUC__ && defined __OPTIMIZE__ \
143    && !defined __cplusplus
144/* Perform some simple optimizations.  */
145# define fread_unlocked(ptr, size, n, stream) \
146  (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n)    \
147		   && (size_t) (size) * (size_t) (n) <= 8		      \
148		   && (size_t) (size) != 0)				      \
149		  ? ({ char *__ptr = (char *) (ptr);			      \
150		       FILE *__stream = (stream);			      \
151		       size_t __cnt;					      \
152		       for (__cnt = (size_t) (size) * (size_t) (n);	      \
153			    __cnt > 0; --__cnt)				      \
154			 {						      \
155			   int __c = _IO_getc_unlocked (__stream);	      \
156			   if (__c == EOF)				      \
157			     break;					      \
158			   *__ptr++ = __c;				      \
159			 }						      \
160		       ((size_t) (size) * (size_t) (n) - __cnt)		      \
161			/ (size_t) (size); })				      \
162		  : (((__builtin_constant_p (size) && (size_t) (size) == 0)   \
163		      || (__builtin_constant_p (n) && (size_t) (n) == 0))     \
164			/* Evaluate all parameters once.  */		      \
165		     ? ((void) (ptr), (void) (stream), (void) (size),	      \
166			(void) (n), (size_t) 0)				      \
167		     : fread_unlocked (ptr, size, n, stream))))
168
169# define fwrite_unlocked(ptr, size, n, stream) \
170  (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n)    \
171		   && (size_t) (size) * (size_t) (n) <= 8		      \
172		   && (size_t) (size) != 0)				      \
173		  ? ({ const char *__ptr = (const char *) (ptr);	      \
174		       FILE *__stream = (stream);			      \
175		       size_t __cnt;					      \
176		       for (__cnt = (size_t) (size) * (size_t) (n);	      \
177			    __cnt > 0; --__cnt)				      \
178			 if (_IO_putc_unlocked (*__ptr++, __stream) == EOF)   \
179			   break;					      \
180		       ((size_t) (size) * (size_t) (n) - __cnt)		      \
181			/ (size_t) (size); })				      \
182		  : (((__builtin_constant_p (size) && (size_t) (size) == 0)   \
183		      || (__builtin_constant_p (n) && (size_t) (n) == 0))     \
184			/* Evaluate all parameters once.  */		      \
185		     ? ((void) (ptr), (void) (stream), (void) (size),	      \
186			(void) (n), (size_t) 0)				      \
187		     : fwrite_unlocked (ptr, size, n, stream))))
188#endif
189
190/* Define helper macro.  */
191#undef __STDIO_INLINE
192