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1 : /* Optimizing macros and inline functions for stdio functions.
2 : Copyright (C) 1998-2022 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 : <https://www.gnu.org/licenses/>. */
18 :
19 : #ifndef _BITS_STDIO_H
20 : #define _BITS_STDIO_H 1
21 :
22 : #ifndef _STDIO_H
23 : # error "Never include <bits/stdio.h> directly; use <stdio.h> instead."
24 : #endif
25 :
26 : #ifndef __extern_inline
27 : # define __STDIO_INLINE inline
28 : #else
29 : # define __STDIO_INLINE __extern_inline
30 : #endif
31 :
32 :
33 : #ifdef __USE_EXTERN_INLINES
34 : /* For -D_FORTIFY_SOURCE{,=2,=3} bits/stdio2.h will define a different
35 : inline. */
36 : # if !(__USE_FORTIFY_LEVEL > 0 && defined __fortify_function)
37 : /* Write formatted output to stdout from argument list ARG. */
38 : __STDIO_INLINE int
39 : vprintf (const char *__restrict __fmt, __gnuc_va_list __arg)
40 : {
41 : return vfprintf (stdout, __fmt, __arg);
42 : }
43 : # endif
44 :
45 : /* Read a character from stdin. */
46 : __STDIO_INLINE int
47 : getchar (void)
48 : {
49 : return getc (stdin);
50 : }
51 :
52 :
53 : # ifdef __USE_MISC
54 : /* Faster version when locking is not necessary. */
55 : __STDIO_INLINE int
56 : fgetc_unlocked (FILE *__fp)
57 : {
58 : return __getc_unlocked_body (__fp);
59 : }
60 : # endif /* misc */
61 :
62 :
63 : # ifdef __USE_POSIX199506
64 : /* This is defined in POSIX.1:1996. */
65 : __STDIO_INLINE int
66 : getc_unlocked (FILE *__fp)
67 : {
68 : return __getc_unlocked_body (__fp);
69 : }
70 :
71 : /* This is defined in POSIX.1:1996. */
72 : __STDIO_INLINE int
73 : getchar_unlocked (void)
74 : {
75 : return __getc_unlocked_body (stdin);
76 : }
77 : # endif /* POSIX */
78 :
79 :
80 : /* Write a character to stdout. */
81 : __STDIO_INLINE int
82 : putchar (int __c)
83 : {
84 : return putc (__c, stdout);
85 : }
86 :
87 :
88 : # ifdef __USE_MISC
89 : /* Faster version when locking is not necessary. */
90 : __STDIO_INLINE int
91 : fputc_unlocked (int __c, FILE *__stream)
92 : {
93 : return __putc_unlocked_body (__c, __stream);
94 : }
95 : # endif /* misc */
96 :
97 :
98 : # ifdef __USE_POSIX199506
99 : /* This is defined in POSIX.1:1996. */
100 : __STDIO_INLINE int
101 : putc_unlocked (int __c, FILE *__stream)
102 : {
103 : return __putc_unlocked_body (__c, __stream);
104 : }
105 :
106 : /* This is defined in POSIX.1:1996. */
107 : __STDIO_INLINE int
108 : putchar_unlocked (int __c)
109 : {
110 : return __putc_unlocked_body (__c, stdout);
111 : }
112 : # endif /* POSIX */
113 :
114 :
115 : # ifdef __USE_GNU
116 : /* Like `getdelim', but reads up to a newline. */
117 : __STDIO_INLINE __ssize_t
118 : getline (char **__lineptr, size_t *__n, FILE *__stream)
119 : {
120 21 : return __getdelim (__lineptr, __n, '\n', __stream);
121 : }
122 : # endif /* GNU */
123 :
124 :
125 : # ifdef __USE_MISC
126 : /* Faster versions when locking is not required. */
127 : __STDIO_INLINE int
128 : __NTH (feof_unlocked (FILE *__stream))
129 : {
130 : return __feof_unlocked_body (__stream);
131 : }
132 :
133 : /* Faster versions when locking is not required. */
134 : __STDIO_INLINE int
135 : __NTH (ferror_unlocked (FILE *__stream))
136 : {
137 : return __ferror_unlocked_body (__stream);
138 : }
139 : # endif /* misc */
140 :
141 : #endif /* Use extern inlines. */
142 :
143 :
144 : #if defined __USE_MISC && defined __GNUC__ && defined __OPTIMIZE__ \
145 : && !defined __cplusplus
146 : /* Perform some simple optimizations. */
147 : # define fread_unlocked(ptr, size, n, stream) \
148 : (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n) \
149 : && (size_t) (size) * (size_t) (n) <= 8 \
150 : && (size_t) (size) != 0) \
151 : ? ({ char *__ptr = (char *) (ptr); \
152 : FILE *__stream = (stream); \
153 : size_t __cnt; \
154 : for (__cnt = (size_t) (size) * (size_t) (n); \
155 : __cnt > 0; --__cnt) \
156 : { \
157 : int __c = getc_unlocked (__stream); \
158 : if (__c == EOF) \
159 : break; \
160 : *__ptr++ = __c; \
161 : } \
162 : ((size_t) (size) * (size_t) (n) - __cnt) \
163 : / (size_t) (size); }) \
164 : : (((__builtin_constant_p (size) && (size_t) (size) == 0) \
165 : || (__builtin_constant_p (n) && (size_t) (n) == 0)) \
166 : /* Evaluate all parameters once. */ \
167 : ? ((void) (ptr), (void) (stream), (void) (size), \
168 : (void) (n), (size_t) 0) \
169 : : fread_unlocked (ptr, size, n, stream))))
170 :
171 : # define fwrite_unlocked(ptr, size, n, stream) \
172 : (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n) \
173 : && (size_t) (size) * (size_t) (n) <= 8 \
174 : && (size_t) (size) != 0) \
175 : ? ({ const char *__ptr = (const char *) (ptr); \
176 : FILE *__stream = (stream); \
177 : size_t __cnt; \
178 : for (__cnt = (size_t) (size) * (size_t) (n); \
179 : __cnt > 0; --__cnt) \
180 : if (putc_unlocked (*__ptr++, __stream) == EOF) \
181 : break; \
182 : ((size_t) (size) * (size_t) (n) - __cnt) \
183 : / (size_t) (size); }) \
184 : : (((__builtin_constant_p (size) && (size_t) (size) == 0) \
185 : || (__builtin_constant_p (n) && (size_t) (n) == 0)) \
186 : /* Evaluate all parameters once. */ \
187 : ? ((void) (ptr), (void) (stream), (void) (size), \
188 : (void) (n), (size_t) 0) \
189 : : fwrite_unlocked (ptr, size, n, stream))))
190 : #endif
191 :
192 : /* Define helper macro. */
193 : #undef __STDIO_INLINE
194 :
195 : #endif /* bits/stdio.h. */
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