1/* Optimizing macros and inline functions for stdio functions.
2 Copyright (C) 1998-2018 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, see
17 <http://www.gnu.org/licenses/>. */
18
19#ifndef _STDIO_H
20# error "Never include <bits/stdio.h> directly; use <stdio.h> instead."
21#endif
22
23#ifndef __extern_inline
24# define __STDIO_INLINE inline
25#else
26# define __STDIO_INLINE __extern_inline
27#endif
28
29
30#ifdef __USE_EXTERN_INLINES
31/* For -D_FORTIFY_SOURCE{,=2} bits/stdio2.h will define a different
32 inline. */
33# if !(__USE_FORTIFY_LEVEL > 0 && defined __fortify_function)
34/* Write formatted output to stdout from argument list ARG. */
35__STDIO_INLINE int
36vprintf (const char *__restrict __fmt, _G_va_list __arg)
37{
38 return vfprintf (stdout, __fmt, __arg);
39}
40# endif
41
42/* Read a character from stdin. */
43__STDIO_INLINE int
44getchar (void)
45{
46 return _IO_getc (stdin);
47}
48
49
50# ifdef __USE_MISC
51/* Faster version when locking is not necessary. */
52__STDIO_INLINE int
53fgetc_unlocked (FILE *__fp)
54{
55 return _IO_getc_unlocked (__fp);
56}
57# endif /* misc */
58
59
60# ifdef __USE_POSIX
61/* This is defined in POSIX.1:1996. */
62__STDIO_INLINE int
63getc_unlocked (FILE *__fp)
64{
65 return _IO_getc_unlocked (__fp);
66}
67
68/* This is defined in POSIX.1:1996. */
69__STDIO_INLINE int
70getchar_unlocked (void)
71{
72 return _IO_getc_unlocked (stdin);
73}
74# endif /* POSIX */
75
76
77/* Write a character to stdout. */
78__STDIO_INLINE int
79putchar (int __c)
80{
81 return _IO_putc (__c, stdout);
82}
83
84
85# ifdef __USE_MISC
86/* Faster version when locking is not necessary. */
87__STDIO_INLINE int
88fputc_unlocked (int __c, FILE *__stream)
89{
90 return _IO_putc_unlocked (__c, __stream);
91}
92# endif /* misc */
93
94
95# ifdef __USE_POSIX
96/* This is defined in POSIX.1:1996. */
97__STDIO_INLINE int
98putc_unlocked (int __c, FILE *__stream)
99{
100 return _IO_putc_unlocked (__c, __stream);
101}
102
103/* This is defined in POSIX.1:1996. */
104__STDIO_INLINE int
105putchar_unlocked (int __c)
106{
107 return _IO_putc_unlocked (__c, stdout);
108}
109# endif /* POSIX */
110
111
112# ifdef __USE_GNU
113/* Like `getdelim', but reads up to a newline. */
114__STDIO_INLINE _IO_ssize_t
115getline (char **__lineptr, size_t *__n, FILE *__stream)
116{
117 return __getdelim (__lineptr, __n, '\n', __stream);
118}
119# endif /* GNU */
120
121
122# ifdef __USE_MISC
123/* Faster versions when locking is not required. */
124__STDIO_INLINE int
125__NTH (feof_unlocked (FILE *__stream))
126{
127 return _IO_feof_unlocked (__stream);
128}
129
130/* Faster versions when locking is not required. */
131__STDIO_INLINE int
132__NTH (ferror_unlocked (FILE *__stream))
133{
134 return _IO_ferror_unlocked (__stream);
135}
136# endif /* misc */
137
138#endif /* Use extern inlines. */
139
140
141#if defined __USE_MISC && defined __GNUC__ && defined __OPTIMIZE__ \
142 && !defined __cplusplus
143/* Perform some simple optimizations. */
144# define fread_unlocked(ptr, size, n, stream) \
145 (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n) \
146 && (size_t) (size) * (size_t) (n) <= 8 \
147 && (size_t) (size) != 0) \
148 ? ({ char *__ptr = (char *) (ptr); \
149 FILE *__stream = (stream); \
150 size_t __cnt; \
151 for (__cnt = (size_t) (size) * (size_t) (n); \
152 __cnt > 0; --__cnt) \
153 { \
154 int __c = _IO_getc_unlocked (__stream); \
155 if (__c == EOF) \
156 break; \
157 *__ptr++ = __c; \
158 } \
159 ((size_t) (size) * (size_t) (n) - __cnt) \
160 / (size_t) (size); }) \
161 : (((__builtin_constant_p (size) && (size_t) (size) == 0) \
162 || (__builtin_constant_p (n) && (size_t) (n) == 0)) \
163 /* Evaluate all parameters once. */ \
164 ? ((void) (ptr), (void) (stream), (void) (size), \
165 (void) (n), (size_t) 0) \
166 : fread_unlocked (ptr, size, n, stream))))
167
168# define fwrite_unlocked(ptr, size, n, stream) \
169 (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n) \
170 && (size_t) (size) * (size_t) (n) <= 8 \
171 && (size_t) (size) != 0) \
172 ? ({ const char *__ptr = (const char *) (ptr); \
173 FILE *__stream = (stream); \
174 size_t __cnt; \
175 for (__cnt = (size_t) (size) * (size_t) (n); \
176 __cnt > 0; --__cnt) \
177 if (_IO_putc_unlocked (*__ptr++, __stream) == EOF) \
178 break; \
179 ((size_t) (size) * (size_t) (n) - __cnt) \
180 / (size_t) (size); }) \
181 : (((__builtin_constant_p (size) && (size_t) (size) == 0) \
182 || (__builtin_constant_p (n) && (size_t) (n) == 0)) \
183 /* Evaluate all parameters once. */ \
184 ? ((void) (ptr), (void) (stream), (void) (size), \
185 (void) (n), (size_t) 0) \
186 : fwrite_unlocked (ptr, size, n, stream))))
187#endif
188
189/* Define helper macro. */
190#undef __STDIO_INLINE
191