libio/bits/stdio.h

   1 /* Optimizing macros and inline functions for stdio functions.
   2    Copyright (C) 1998, 2000, 2001, 2004, 2007 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 #ifndef __extern_inline
  25 # define __STDIO_INLINE inline
  26 #else
  27 # define __STDIO_INLINE __extern_inline
  28 #endif
  29
  30
  31 #ifdef __USE_EXTERN_INLINES
  32 /* For -D_FORTIFY_SOURCE{,=2} bits/stdio2.h will define a different
  33    inline.  */
  34 # if !(__USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline)
  35 /* Write formatted output to stdout from argument list ARG.  */
  36 __STDIO_INLINE int
  37 vprintf (__const char *__restrict __fmt, _G_va_list __arg)
  38 {
  39   return vfprintf (stdout, __fmt, __arg);
  40 }
  41 # endif
  42
  43 /* Read a character from stdin.  */
  44 __STDIO_INLINE int
  45 getchar (void)
  46 {
  47   return _IO_getc (stdin);
  48 }
  49
  50
  51 # ifdef __USE_MISC
  52 /* Faster version when locking is not necessary.  */
  53 __STDIO_INLINE int
  54 fgetc_unlocked (FILE *__fp)
  55 {
  56   return _IO_getc_unlocked (__fp);
  57 }
  58 # endif /* misc */
  59
  60
  61 # if defined __USE_POSIX || defined __USE_MISC
  62 /* This is defined in POSIX.1:1996.  */
  63 __STDIO_INLINE int
  64 getc_unlocked (FILE *__fp)
  65 {
  66   return _IO_getc_unlocked (__fp);
  67 }
  68
  69 /* This is defined in POSIX.1:1996.  */
  70 __STDIO_INLINE int
  71 getchar_unlocked (void)
  72 {
  73   return _IO_getc_unlocked (stdin);
  74 }
  75 # endif /* POSIX || misc */
  76
  77
  78 /* Write a character to stdout.  */
  79 __STDIO_INLINE int
  80 putchar (int __c)
  81 {
  82   return _IO_putc (__c, stdout);
  83 }
  84
  85
  86 # ifdef __USE_MISC
  87 /* Faster version when locking is not necessary.  */
  88 __STDIO_INLINE int
  89 fputc_unlocked (int __c, FILE *__stream)
  90 {
  91   return _IO_putc_unlocked (__c, __stream);
  92 }
  93 # endif /* misc */
  94
  95
  96 # if defined __USE_POSIX || defined __USE_MISC
  97 /* This is defined in POSIX.1:1996.  */
  98 __STDIO_INLINE int
  99 putc_unlocked (int __c, FILE *__stream)
 100 {
 101   return _IO_putc_unlocked (__c, __stream);
 102 }
 103
 104 /* This is defined in POSIX.1:1996.  */
 105 __STDIO_INLINE int
 106 putchar_unlocked (int __c)
 107 {
 108   return _IO_putc_unlocked (__c, stdout);
 109 }
 110 # endif /* POSIX || misc */
 111
 112
 113 # ifdef __USE_GNU
 114 /* Like `getdelim', but reads up to a newline.  */
 115 __STDIO_INLINE _IO_ssize_t
 116 getline (char **__lineptr, size_t *__n, FILE *__stream)
 117 {
 118   return __getdelim (__lineptr, __n, '\n', __stream);
 119 }
 120 # endif /* GNU */
 121
 122
 123 # ifdef __USE_MISC
 124 /* Faster versions when locking is not required.  */
 125 __STDIO_INLINE int
 126 __NTH (feof_unlocked (FILE *__stream))
 127 {
 128   return _IO_feof_unlocked (__stream);
 129 }
 130
 131 /* Faster versions when locking is not required.  */
 132 __STDIO_INLINE int
 133 __NTH (ferror_unlocked (FILE *__stream))
 134 {
 135   return _IO_ferror_unlocked (__stream);
 136 }
 137 # endif /* misc */
 138
 139 #endif /* Use extern inlines.  */
 140
 141
 142 #if defined __USE_MISC && defined __GNUC__ && defined __OPTIMIZE__ \
 143     && !defined __cplusplus
 144 /* Perform some simple optimizations.  */
 145 # define fread_unlocked(ptr, size, n, stream) \
 146   (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n)    \
 147                    && (size_t) (size) * (size_t) (n) <= 8                     \
 148                    && (size_t) (size) != 0)                                   \
 149                   ? ({ char *__ptr = (char *) (ptr);                          \
 150                        FILE *__stream = (stream);                             \
 151                        size_t __cnt;                                          \
 152                        for (__cnt = (size_t) (size) * (size_t) (n);           \
 153                             __cnt > 0; --__cnt)                               \
 154                          {                                                    \
 155                            int __c = _IO_getc_unlocked (__stream);            \
 156                            if (__c == EOF)                                    \
 157                              break;                                           \
 158                            *__ptr++ = __c;                                    \
 159                          }                                                    \
 160                        ((size_t) (size) * (size_t) (n) - __cnt)               \
 161                         / (size_t) (size); })                                 \
 162                   : (((__builtin_constant_p (size) && (size_t) (size) == 0)   \
 163                       || (__builtin_constant_p (n) && (size_t) (n) == 0))     \
 164                         /* Evaluate all parameters once.  */                  \
 165                      ? ((void) (ptr), (void) (stream), (void) (size),         \
 166                         (void) (n), (size_t) 0)                               \
 167                      : fread_unlocked (ptr, size, n, stream))))
 168
 169 # define fwrite_unlocked(ptr, size, n, stream) \
 170   (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n)    \
 171                    && (size_t) (size) * (size_t) (n) <= 8                     \
 172                    && (size_t) (size) != 0)                                   \
 173                   ? ({ const char *__ptr = (const char *) (ptr);              \
 174                        FILE *__stream = (stream);                             \
 175                        size_t __cnt;                                          \
 176                        for (__cnt = (size_t) (size) * (size_t) (n);           \
 177                             __cnt > 0; --__cnt)                               \
 178                          if (_IO_putc_unlocked (*__ptr++, __stream) == EOF)   \
 179                            break;                                             \
 180                        ((size_t) (size) * (size_t) (n) - __cnt)               \
 181                         / (size_t) (size); })                                 \
 182                   : (((__builtin_constant_p (size) && (size_t) (size) == 0)   \
 183                       || (__builtin_constant_p (n) && (size_t) (n) == 0))     \
 184                         /* Evaluate all parameters once.  */                  \
 185                      ? ((void) (ptr), (void) (stream), (void) (size),         \
 186                         (void) (n), (size_t) 0)                               \
 187                      : fwrite_unlocked (ptr, size, n, stream))))
 188 #endif
 189
 190 /* Define helper macro.  */
 191 #undef __STDIO_INLINE