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1 : /* Optimizing macros and inline functions for stdio functions.
2 : Copyright (C) 1998-2014 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
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
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
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
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
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
79 : putchar (int __c)
80 : {
81 39 : return _IO_putc (__c, stdout);
82 : }
83 :
84 :
85 : # ifdef __USE_MISC
86 : /* Faster version when locking is not necessary. */
87 : __STDIO_INLINE int
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
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
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
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
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
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