lib/unlocked-io.h

   1 /* Prefer faster, non-thread-safe stdio functions if available.
   2
   3    Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License along
  16    with this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 /* Written by Jim Meyering.  */
  20
  21 #ifndef UNLOCKED_IO_H
  22 # define UNLOCKED_IO_H 1
  23
  24 # ifndef USE_UNLOCKED_IO
  25 #  define USE_UNLOCKED_IO 1
  26 # endif
  27
  28 # if USE_UNLOCKED_IO
  29
  30 /* These are wrappers for functions/macros from the GNU C library, and
  31    from other C libraries supporting POSIX's optional thread-safe functions.
  32
  33    The standard I/O functions are thread-safe.  These *_unlocked ones are
  34    more efficient but not thread-safe.  That they're not thread-safe is
  35    fine since all of the applications in this package are single threaded.
  36
  37    Also, some code that is shared with the GNU C library may invoke
  38    the *_unlocked functions directly.  On hosts that lack those
  39    functions, invoke the non-thread-safe versions instead.  */
  40
  41 #  include <stdio.h>
  42
  43 #  if HAVE_DECL_CLEARERR_UNLOCKED
  44 #   undef clearerr
  45 #   define clearerr(x) clearerr_unlocked (x)
  46 #  else
  47 #   define clearerr_unlocked(x) clearerr (x)
  48 #  endif
  49 #  if HAVE_DECL_FEOF_UNLOCKED
  50 #   undef feof
  51 #   define feof(x) feof_unlocked (x)
  52 #  else
  53 #   define feof_unlocked(x) feof (x)
  54 #  endif
  55 #  if HAVE_DECL_FERROR_UNLOCKED
  56 #   undef ferror
  57 #   define ferror(x) ferror_unlocked (x)
  58 #  else
  59 #   define ferror_unlocked(x) ferror (x)
  60 #  endif
  61 #  if HAVE_DECL_FFLUSH_UNLOCKED
  62 #   undef fflush
  63 #   define fflush(x) fflush_unlocked (x)
  64 #  else
  65 #   define fflush_unlocked(x) fflush (x)
  66 #  endif
  67 #  if HAVE_DECL_FGETS_UNLOCKED
  68 #   undef fgets
  69 #   define fgets(x,y,z) fgets_unlocked (x,y,z)
  70 #  else
  71 #   define fgets_unlocked(x,y,z) fgets (x,y,z)
  72 #  endif
  73 #  if HAVE_DECL_FPUTC_UNLOCKED
  74 #   undef fputc
  75 #   define fputc(x,y) fputc_unlocked (x,y)
  76 #  else
  77 #   define fputc_unlocked(x,y) fputc (x,y)
  78 #  endif
  79 #  if HAVE_DECL_FPUTS_UNLOCKED
  80 #   undef fputs
  81 #   define fputs(x,y) fputs_unlocked (x,y)
  82 #  else
  83 #   define fputs_unlocked(x,y) fputs (x,y)
  84 #  endif
  85 #  if HAVE_DECL_FREAD_UNLOCKED
  86 #   undef fread
  87 #   define fread(w,x,y,z) fread_unlocked (w,x,y,z)
  88 #  else
  89 #   define fread_unlocked(w,x,y,z) fread (w,x,y,z)
  90 #  endif
  91 #  if HAVE_DECL_FWRITE_UNLOCKED
  92 #   undef fwrite
  93 #   define fwrite(w,x,y,z) fwrite_unlocked (w,x,y,z)
  94 #  else
  95 #   define fwrite_unlocked(w,x,y,z) fwrite (w,x,y,z)
  96 #  endif
  97 #  if HAVE_DECL_GETC_UNLOCKED
  98 #   undef getc
  99 #   define getc(x) getc_unlocked (x)
 100 #  else
 101 #   define getc_unlocked(x) getc (x)
 102 #  endif
 103 #  if HAVE_DECL_GETCHAR_UNLOCKED
 104 #   undef getchar
 105 #   define getchar() getchar_unlocked ()
 106 #  else
 107 #   define getchar_unlocked() getchar ()
 108 #  endif
 109 #  if HAVE_DECL_PUTC_UNLOCKED
 110 #   undef putc
 111 #   define putc(x,y) putc_unlocked (x,y)
 112 #  else
 113 #   define putc_unlocked(x,y) putc (x,y)
 114 #  endif
 115 #  if HAVE_DECL_PUTCHAR_UNLOCKED
 116 #   undef putchar
 117 #   define putchar(x) putchar_unlocked (x)
 118 #  else
 119 #   define putchar_unlocked(x) putchar (x)
 120 #  endif
 121
 122 #  undef flockfile
 123 #  define flockfile(x) ((void) 0)
 124
 125 #  undef ftrylockfile
 126 #  define ftrylockfile(x) 0
 127
 128 #  undef funlockfile
 129 #  define funlockfile(x) ((void) 0)
 130
 131 # endif /* USE_UNLOCKED_IO */
 132 #endif /* UNLOCKED_IO_H */