libio/bits/stdio.h

   1 /* Optimizing macros and inline functions for stdio functions.
   2    Copyright (C) 1998, 2000, 2001, 2004 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
  34 vprintf (__const char *__restrict __fmt, _G_va_list __arg)
  35 {
  36   return vfprintf (stdout, __fmt, __arg);
  37 }
  38
  39 /* Read a character from stdin.  */
  40 __STDIO_INLINE int
  41 getchar (void)
  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
  50 getc_unlocked (FILE *__fp)
  51 {
  52   return _IO_getc_unlocked (__fp);
  53 }
  54
  55 /* This is defined in POSIX.1:1996.  */
  56 __STDIO_INLINE int
  57 getchar_unlocked (void)
  58 {
  59   return _IO_getc_unlocked (stdin);
  60 }
  61 # endif /* POSIX || misc */
  62
  63
  64 /* Write a character to stdout.  */
  65 __STDIO_INLINE int
  66 putchar (int __c)
  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
  75 fputc_unlocked (int __c, FILE *__stream)
  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
  85 putc_unlocked (int __c, FILE *__stream)
  86 {
  87   return _IO_putc_unlocked (__c, __stream);
  88 }
  89
  90 /* This is defined in POSIX.1:1996.  */
  91 __STDIO_INLINE int
  92 putchar_unlocked (int __c)
  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
 102 getline (char **__lineptr, size_t *__n, FILE *__stream)
 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
 112 feof_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
 119 ferror_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) * (size_t) (n) <= 8                     \
 133                    && (size_t) (size) != 0)                                   \
 134                   ? ({ char *__ptr = (char *) (ptr);                          \
 135                        FILE *__stream = (stream);                             \
 136                        size_t __cnt;                                          \
 137                        for (__cnt = (size_t) (size) * (size_t) (n);           \
 138                             __cnt > 0; --__cnt)                               \
 139                          {                                                    \
 140                            int __c = _IO_getc_unlocked (__stream);            \
 141                            if (__c == EOF)                                    \
 142                              break;                                           \
 143                            *__ptr++ = __c;                                    \
 144                          }                                                    \
 145                        ((size_t) (size) * (size_t) (n) - __cnt)               \
 146                         / (size_t) (size); })                                 \
 147                   : (((__builtin_constant_p (size) && (size_t) (size) == 0)   \
 148                       || (__builtin_constant_p (n) && (size_t) (n) == 0))     \
 149                         /* Evaluate all parameters once.  */                  \
 150                      ? ((void) (ptr), (void) (stream), (void) (size),         \
 151                         (void) (n), (size_t) 0)                               \
 152                      : fread_unlocked (ptr, size, n, stream))))
 153
 154 # define fwrite_unlocked(ptr, size, n, stream) \
 155   (__extension__ ((__builtin_constant_p (size) && __builtin_constant_p (n)    \
 156                    && (size_t) (size) * (size_t) (n) <= 8                     \
 157                    && (size_t) (size) != 0)                                   \
 158                   ? ({ const char *__ptr = (const char *) (ptr);              \
 159                        FILE *__stream = (stream);                             \
 160                        size_t __cnt;                                          \
 161                        for (__cnt = (size_t) (size) * (size_t) (n);           \
 162                             __cnt > 0; --__cnt)                               \
 163                          if (_IO_putc_unlocked (*__ptr++, __stream) == EOF)   \
 164                            break;                                             \
 165                        ((size_t) (size) * (size_t) (n) - __cnt)               \
 166                         / (size_t) (size); })                                 \
 167                   : (((__builtin_constant_p (size) && (size_t) (size) == 0)   \
 168                       || (__builtin_constant_p (n) && (size_t) (n) == 0))     \
 169                         /* Evaluate all parameters once.  */                  \
 170                      ? ((void) (ptr), (void) (stream), (void) (size),         \
 171                         (void) (n), (size_t) 0)                               \
 172                      : fwrite_unlocked (ptr, size, n, stream))))
 173 #endif
 174
 175 /* Define helper macro.  */
 176 #undef __STDIO_INLINE