1/* Optimizing macros and inline functions for stdio functions.
2   Copyright (C) 1998, 2000, 2001 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, write to the Free
17   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18   02111-1307 USA.  */
19
20#ifndef _STDIO_H
21# error "Never include <bits/stdio.h> directly; use <stdio.h> instead."
22#endif
23
24#ifdef __cplusplus
25# define __STDIO_INLINE inline
26#else
27# define __STDIO_INLINE __extern_inline
28#endif
29
30
31#ifdef __USE_EXTERN_INLINES
32/* Write formatted output to stdout from argument list ARG.  */
33__STDIO_INLINE int
34vprintf (__const char *__restrict __fmt, _G_va_list __arg) __THROW
35{
36  return vfprintf (stdout, __fmt, __arg);
37}
38
39/* Read a character from stdin.  */
40__STDIO_INLINE int
41getchar (void) __THROW
42{
43  return _IO_getc (stdin);
44}
45
46
47# if defined __USE_POSIX || defined __USE_MISC
48/* This is defined in POSIX.1:1996.  */
49__STDIO_INLINE int
50getc_unlocked (FILE *__fp) __THROW
51{
52  return _IO_getc_unlocked (__fp);
53}
54
55/* This is defined in POSIX.1:1996.  */
56__STDIO_INLINE int
57getchar_unlocked (void) __THROW
58{
59  return _IO_getc_unlocked (stdin);
60}
61# endif	/* POSIX || misc */
62
63
64/* Write a character to stdout.  */
65__STDIO_INLINE int
66putchar (int __c) __THROW
67{
68  return _IO_putc (__c, stdout);
69}
70
71
72# ifdef __USE_MISC
73/* Faster version when locking is not necessary.  */
74__STDIO_INLINE int
75fputc_unlocked (int __c, FILE *__stream) __THROW
76{
77  return _IO_putc_unlocked (__c, __stream);
78}
79# endif /* misc */
80
81
82# if defined __USE_POSIX || defined __USE_MISC
83/* This is defined in POSIX.1:1996.  */
84__STDIO_INLINE int
85putc_unlocked (int __c, FILE *__stream) __THROW
86{
87  return _IO_putc_unlocked (__c, __stream);
88}
89
90/* This is defined in POSIX.1:1996.  */
91__STDIO_INLINE int
92putchar_unlocked (int __c) __THROW
93{
94  return _IO_putc_unlocked (__c, stdout);
95}
96# endif	/* POSIX || misc */
97
98
99# ifdef	__USE_GNU
100/* Like `getdelim', but reads up to a newline.  */
101__STDIO_INLINE _IO_ssize_t
102getline (char **__lineptr, size_t *__n, FILE *__stream) __THROW
103{
104  return __getdelim (__lineptr, __n, '\n', __stream);
105}
106# endif /* GNU */
107
108
109# ifdef __USE_MISC
110/* Faster versions when locking is not required.  */
111__STDIO_INLINE int
112feof_unlocked (FILE *__stream) __THROW
113{
114  return _IO_feof_unlocked (__stream);
115}
116
117/* Faster versions when locking is not required.  */
118__STDIO_INLINE int
119ferror_unlocked (FILE *__stream) __THROW
120{
121  return _IO_ferror_unlocked (__stream);
122}
123# endif /* misc */
124
125#endif /* Use extern inlines.  */
126
127
128#if defined __USE_MISC && defined __GNUC__ && defined __OPTIMIZE__
129/* Perform some simple optimizations.  */
130# define fread_unlocked(ptr, size, n, stream) \
131  (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n)    \
132		   && (size_t) ((size) * (n)) <= 8 && (size) != 0)	      \
133		  ? ({ char *__ptr = (char *) (ptr);			      \
134		       FILE *__stream = (stream);			      \
135		       size_t __cnt;					      \
136		       for (__cnt = (size) * (n); __cnt > 0; --__cnt)	      \
137			 {						      \
138			   int __c = _IO_getc_unlocked (__stream);	      \
139			   if (__c == EOF)				      \
140			     break;					      \
141			   *__ptr++ = __c;				      \
142			 }						      \
143		       ((size_t) ((size) * (n)) - __cnt) / (size); })	      \
144		  : (((__builtin_constant_p (size) && (size) == 0)	      \
145		      || (__builtin_constant_p (n) && (n) == 0))	      \
146			/* Evaluate all parameters once.  */		      \
147		     ? ((void) (ptr), (void) (stream), (void) (size),	      \
148			(void) (n), 0)					      \
149		     : fread_unlocked (ptr, size, n, stream))))
150
151# define fwrite_unlocked(ptr, size, n, stream) \
152  (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n)    \
153		   && (size_t) ((size) * (n)) <= 8 && (size) != 0)	      \
154		  ? ({ const char *__ptr = (const char *) (ptr);	      \
155		       FILE *__stream = (stream);			      \
156		       size_t __cnt;					      \
157		       for (__cnt = (size) * (n); __cnt > 0; --__cnt)	      \
158			 if (_IO_putc_unlocked (*__ptr++, __stream) == EOF)   \
159			   break;					      \
160		       ((size_t) ((size) * (n)) - __cnt) / (size); })	      \
161		  : (((__builtin_constant_p (size) && (size) == 0)	      \
162		      || (__builtin_constant_p (n) && (n) == 0))	      \
163			/* Evaluate all parameters once.  */		      \
164		     ? ((void) (ptr), (void) (stream), (void) (size), n)      \
165		     : fwrite_unlocked (ptr, size, n, stream))))
166#endif
167
168/* Define helper macro.  */
169#undef __STDIO_INLINE
170