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196 lines
5.5 KiB
C
196 lines
5.5 KiB
C
/* Optimizing macros and inline functions for stdio functions.
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Copyright (C) 1998-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _BITS_STDIO_H
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#define _BITS_STDIO_H 1
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#ifndef _STDIO_H
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# error "Never include <bits/stdio.h> directly; use <stdio.h> instead."
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#endif
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#ifndef __extern_inline
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# define __STDIO_INLINE inline
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#else
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# define __STDIO_INLINE __extern_inline
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#endif
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#ifdef __USE_EXTERN_INLINES
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/* For -D_FORTIFY_SOURCE{,=2,=3} bits/stdio2.h will define a different
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inline. */
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# if !(__USE_FORTIFY_LEVEL > 0 && defined __fortify_function)
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/* Write formatted output to stdout from argument list ARG. */
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__STDIO_INLINE int
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vprintf (const char *__restrict __fmt, __gnuc_va_list __arg)
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{
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return vfprintf (stdout, __fmt, __arg);
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}
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# endif
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/* Read a character from stdin. */
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__STDIO_INLINE int
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getchar (void)
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{
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return getc (stdin);
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}
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# ifdef __USE_MISC
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/* Faster version when locking is not necessary. */
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__STDIO_INLINE int
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fgetc_unlocked (FILE *__fp)
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{
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return __getc_unlocked_body (__fp);
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}
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# endif /* misc */
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# ifdef __USE_POSIX199506
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/* This is defined in POSIX.1:1996. */
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__STDIO_INLINE int
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getc_unlocked (FILE *__fp)
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{
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return __getc_unlocked_body (__fp);
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}
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/* This is defined in POSIX.1:1996. */
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__STDIO_INLINE int
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getchar_unlocked (void)
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{
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return __getc_unlocked_body (stdin);
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}
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# endif /* POSIX */
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/* Write a character to stdout. */
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__STDIO_INLINE int
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putchar (int __c)
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{
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return putc (__c, stdout);
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}
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# ifdef __USE_MISC
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/* Faster version when locking is not necessary. */
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__STDIO_INLINE int
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fputc_unlocked (int __c, FILE *__stream)
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{
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return __putc_unlocked_body (__c, __stream);
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}
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# endif /* misc */
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# ifdef __USE_POSIX199506
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/* This is defined in POSIX.1:1996. */
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__STDIO_INLINE int
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putc_unlocked (int __c, FILE *__stream)
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{
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return __putc_unlocked_body (__c, __stream);
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}
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/* This is defined in POSIX.1:1996. */
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__STDIO_INLINE int
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putchar_unlocked (int __c)
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{
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return __putc_unlocked_body (__c, stdout);
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}
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# endif /* POSIX */
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# ifdef __USE_GNU
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/* Like `getdelim', but reads up to a newline. */
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__STDIO_INLINE __ssize_t
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getline (char **__lineptr, size_t *__n, FILE *__stream)
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{
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return __getdelim (__lineptr, __n, '\n', __stream);
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}
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# endif /* GNU */
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# ifdef __USE_MISC
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/* Faster versions when locking is not required. */
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__STDIO_INLINE int
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__NTH (feof_unlocked (FILE *__stream))
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{
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return __feof_unlocked_body (__stream);
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}
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/* Faster versions when locking is not required. */
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__STDIO_INLINE int
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__NTH (ferror_unlocked (FILE *__stream))
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{
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return __ferror_unlocked_body (__stream);
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}
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# endif /* misc */
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#endif /* Use extern inlines. */
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#if defined __USE_MISC && defined __GNUC__ && defined __OPTIMIZE__ \
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&& !defined __cplusplus
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/* Perform some simple optimizations. */
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# define fread_unlocked(ptr, size, n, stream) \
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(__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n) \
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&& (size_t) (size) * (size_t) (n) <= 8 \
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&& (size_t) (size) != 0) \
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? ({ char *__ptr = (char *) (ptr); \
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FILE *__stream = (stream); \
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size_t __cnt; \
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for (__cnt = (size_t) (size) * (size_t) (n); \
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__cnt > 0; --__cnt) \
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{ \
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int __c = getc_unlocked (__stream); \
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if (__c == EOF) \
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break; \
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*__ptr++ = __c; \
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} \
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((size_t) (size) * (size_t) (n) - __cnt) \
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/ (size_t) (size); }) \
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: (((__builtin_constant_p (size) && (size_t) (size) == 0) \
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|| (__builtin_constant_p (n) && (size_t) (n) == 0)) \
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/* Evaluate all parameters once. */ \
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? ((void) (ptr), (void) (stream), (void) (size), \
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(void) (n), (size_t) 0) \
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: fread_unlocked (ptr, size, n, stream))))
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# define fwrite_unlocked(ptr, size, n, stream) \
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(__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n) \
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&& (size_t) (size) * (size_t) (n) <= 8 \
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&& (size_t) (size) != 0) \
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? ({ const char *__ptr = (const char *) (ptr); \
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FILE *__stream = (stream); \
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size_t __cnt; \
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for (__cnt = (size_t) (size) * (size_t) (n); \
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__cnt > 0; --__cnt) \
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if (putc_unlocked (*__ptr++, __stream) == EOF) \
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break; \
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((size_t) (size) * (size_t) (n) - __cnt) \
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/ (size_t) (size); }) \
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: (((__builtin_constant_p (size) && (size_t) (size) == 0) \
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|| (__builtin_constant_p (n) && (size_t) (n) == 0)) \
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/* Evaluate all parameters once. */ \
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? ((void) (ptr), (void) (stream), (void) (size), \
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(void) (n), (size_t) 0) \
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: fwrite_unlocked (ptr, size, n, stream))))
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#endif
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/* Define helper macro. */
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#undef __STDIO_INLINE
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#endif /* bits/stdio.h. */
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