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glibc/libio/bits/stdio.h
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/* Optimizing macros and inline functions for stdio functions. | |
Copyright (C) 198 Free Software Foundation, Inc. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Library General Public License as | |
published by the Free Software Foundation; either version 2 of the | |
License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Library General Public License for more details. | |
You should have received a copy of the GNU Library General Public | |
License along with the GNU C Library; see the file COPYING.LIB. If not, | |
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
Boston, MA 02111-1307, USA. */ | |
#ifndef _STDIO_H | |
# error "Never include <bits/stdio.h> directly; use <stdio.h> instead." | |
#endif | |
#ifdef __cplusplus | |
# define __STDIO_INLINE inline | |
#else | |
# define __STDIO_INLINE extern __inline | |
#endif | |
#ifdef __USE_EXTERN_INLINES | |
/* Write formatted output to stdout from argument list ARG. */ | |
__STDIO_INLINE int | |
vprintf (__const char *__restrict __fmt, _G_va_list __arg) __THROW | |
{ | |
return vfprintf (stdout, __fmt, __arg); | |
} | |
/* Read a character from stdin. */ | |
__STDIO_INLINE int | |
getchar (void) __THROW | |
{ | |
return _IO_getc (stdin); | |
} | |
# if defined __USE_POSIX || defined __USE_MISC | |
/* This is defined in POSIX.1:1996. */ | |
__STDIO_INLINE int | |
getc_unlocked (FILE *__fp) __THROW | |
{ | |
return _IO_getc_unlocked (__fp); | |
} | |
/* This is defined in POSIX.1:1996. */ | |
__STDIO_INLINE int | |
getchar_unlocked (void) __THROW | |
{ | |
return _IO_getc_unlocked (stdin); | |
} | |
# endif /* POSIX || misc */ | |
/* Write a character to stdout. */ | |
__STDIO_INLINE int | |
putchar (int __c) __THROW | |
{ | |
return _IO_putc (__c, stdout); | |
} | |
# ifdef __USE_MISC | |
/* Faster version when locking is not necessary. */ | |
__STDIO_INLINE int | |
fputc_unlocked (int __c, FILE *__stream) __THROW | |
{ | |
return _IO_putc_unlocked (__c, __stream); | |
} | |
# endif /* misc */ | |
# if defined __USE_POSIX || defined __USE_MISC | |
/* This is defined in POSIX.1:1996. */ | |
__STDIO_INLINE int | |
putc_unlocked (int __c, FILE *__stream) __THROW | |
{ | |
return _IO_putc_unlocked (__c, __stream); | |
} | |
/* This is defined in POSIX.1:1996. */ | |
__STDIO_INLINE int | |
putchar_unlocked (int __c) __THROW | |
{ | |
return _IO_putc_unlocked (__c, stdout); | |
} | |
# endif /* POSIX || misc */ | |
# ifdef __USE_GNU | |
/* Like `getdelim', but reads up to a newline. */ | |
__STDIO_INLINE _IO_ssize_t | |
getline (char **__lineptr, size_t *__n, FILE *__stream) __THROW | |
{ | |
return __getdelim (__lineptr, __n, '\n', __stream); | |
} | |
# endif /* GNU */ | |
# ifdef __USE_MISC | |
/* Faster versions when locking is not required. */ | |
__STDIO_INLINE int | |
feof_unlocked (FILE *__stream) __THROW | |
{ | |
return _IO_feof_unlocked (__stream); | |
} | |
/* Faster versions when locking is not required. */ | |
__STDIO_INLINE int | |
ferror_unlocked (FILE *__stream) __THROW | |
{ | |
return _IO_ferror_unlocked (__stream); | |
} | |
# endif /* misc */ | |
#endif /* Use extern inlines. */ | |
#if defined __USE_MISC && defined __GNUC__ && defined __OPTIMIZE__ | |
/* Perform some simple optimizations. */ | |
# define fread_unlocked(ptr, size, n, stream) \ | |
(__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n) \ | |
&& (size_t) ((size) * (n)) <= 8) \ | |
? ({ char *__ptr = (char *) (ptr); \ | |
FILE *__stream = (stream); \ | |
int __c; \ | |
size_t __cnt = (size) * (n); \ | |
while (__cnt-- > 0) \ | |
{ \ | |
__c = _IO_getc_unlocked (__stream); \ | |
if (__c == EOF) \ | |
break; \ | |
*__ptr++ = __c; \ | |
} \ | |
((size_t) ((size) * (n)) - __cnt) / (size); }) \ | |
: fread_unlocked (ptr, size, n, stream))) | |
# define fwrite_unlocked(ptr, size, n, stream) \ | |
(__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n) \ | |
&& (size_t) ((size) * (n)) <= 8) \ | |
? ({ const char *__ptr = (const char *) (ptr); \ | |
FILE *__stream = (stream); \ | |
size_t __cnt = (size) * (n); \ | |
while (__cnt-- > 0) \ | |
if (_IO_putc_unlocked (*__ptr++, __stream) == EOF) \ | |
break; \ | |
((size_t) ((size) * (n)) - __cnt) / (size); }) \ | |
: fwrite_unlocked (ptr, size, n, stream))) | |
#endif | |
/* Define helper macro. */ | |
#undef __STDIO_INLINE |