1 /* Optimizing macros and inline functions for stdio functions.
2 Copyright (C) 1998,2000,2001,2004,2007,2012 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
vprintf(const char * __restrict __fmt,_G_va_list __arg)36 vprintf (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
getchar(void)44 getchar (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
fgetc_unlocked(FILE * __fp)53 fgetc_unlocked (FILE *__fp)
54 {
55 return _IO_getc_unlocked (__fp);
56 }
57 # endif /* misc */
58
59
60 # if defined __USE_POSIX || defined __USE_MISC
61 /* This is defined in POSIX.1:1996. */
62 __STDIO_INLINE int
getc_unlocked(FILE * __fp)63 getc_unlocked (FILE *__fp)
64 {
65 return _IO_getc_unlocked (__fp);
66 }
67
68 /* This is defined in POSIX.1:1996. */
69 __STDIO_INLINE int
getchar_unlocked(void)70 getchar_unlocked (void)
71 {
72 return _IO_getc_unlocked (stdin);
73 }
74 # endif /* POSIX || misc */
75
76
77 /* Write a character to stdout. */
78 __STDIO_INLINE int
putchar(int __c)79 putchar (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
fputc_unlocked(int __c,FILE * __stream)88 fputc_unlocked (int __c, FILE *__stream)
89 {
90 return _IO_putc_unlocked (__c, __stream);
91 }
92 # endif /* misc */
93
94
95 # if defined __USE_POSIX || defined __USE_MISC
96 /* This is defined in POSIX.1:1996. */
97 __STDIO_INLINE int
putc_unlocked(int __c,FILE * __stream)98 putc_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
putchar_unlocked(int __c)105 putchar_unlocked (int __c)
106 {
107 return _IO_putc_unlocked (__c, stdout);
108 }
109 # endif /* POSIX || misc */
110
111
112 # ifdef __USE_GNU
113 /* Like `getdelim', but reads up to a newline. */
114 __STDIO_INLINE _IO_ssize_t
getline(char ** __lineptr,size_t * __n,FILE * __stream)115 getline (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
__NTH(feof_unlocked (FILE * __stream))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
__NTH(ferror_unlocked (FILE * __stream))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