lib/unlocked-io.h

   1 /* Prefer faster, non-thread-safe stdio functions if available.
   2
   3    Copyright (C) 2001-2004, 2009-2018 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 3 of the License, or
   8    (at your option) 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
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Jim Meyering.  */
  19
  20 #ifndef UNLOCKED_IO_H
  21 # define UNLOCKED_IO_H 1
  22
  23 /* These are wrappers for functions/macros from the GNU C library, and
  24    from other C libraries supporting POSIX's optional thread-safe functions.
  25
  26    The standard I/O functions are thread-safe.  These *_unlocked ones are
  27    more efficient but not thread-safe.  That they're not thread-safe is
  28    fine since all of the applications in this package are single threaded.
  29
  30    Also, some code that is shared with the GNU C library may invoke
  31    the *_unlocked functions directly.  On hosts that lack those
  32    functions, invoke the non-thread-safe versions instead.  */
  33
  34 # include <stdio.h>
  35
  36 # if HAVE_DECL_CLEARERR_UNLOCKED
  37 #  undef clearerr
  38 #  define clearerr(x) clearerr_unlocked (x)
  39 # else
  40 #  define clearerr_unlocked(x) clearerr (x)
  41 # endif
  42
  43 # if HAVE_DECL_FEOF_UNLOCKED
  44 #  undef feof
  45 #  define feof(x) feof_unlocked (x)
  46 # else
  47 #  define feof_unlocked(x) feof (x)
  48 # endif
  49
  50 # if HAVE_DECL_FERROR_UNLOCKED
  51 #  undef ferror
  52 #  define ferror(x) ferror_unlocked (x)
  53 # else
  54 #  define ferror_unlocked(x) ferror (x)
  55 # endif
  56
  57 # if HAVE_DECL_FFLUSH_UNLOCKED
  58 #  undef fflush
  59 #  define fflush(x) fflush_unlocked (x)
  60 # else
  61 #  define fflush_unlocked(x) fflush (x)
  62 # endif
  63
  64 # if HAVE_DECL_FGETS_UNLOCKED
  65 #  undef fgets
  66 #  define fgets(x,y,z) fgets_unlocked (x,y,z)
  67 # else
  68 #  define fgets_unlocked(x,y,z) fgets (x,y,z)
  69 # endif
  70
  71 # if HAVE_DECL_FPUTC_UNLOCKED
  72 #  undef fputc
  73 #  define fputc(x,y) fputc_unlocked (x,y)
  74 # else
  75 #  define fputc_unlocked(x,y) fputc (x,y)
  76 # endif
  77
  78 # if HAVE_DECL_FPUTS_UNLOCKED
  79 #  undef fputs
  80 #  define fputs(x,y) fputs_unlocked (x,y)
  81 # else
  82 #  define fputs_unlocked(x,y) fputs (x,y)
  83 # endif
  84
  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
  92 # if HAVE_DECL_FWRITE_UNLOCKED
  93 #  undef fwrite
  94 #  define fwrite(w,x,y,z) fwrite_unlocked (w,x,y,z)
  95 # else
  96 #  define fwrite_unlocked(w,x,y,z) fwrite (w,x,y,z)
  97 # endif
  98
  99 # if HAVE_DECL_GETC_UNLOCKED
 100 #  undef getc
 101 #  define getc(x) getc_unlocked (x)
 102 # else
 103 #  define getc_unlocked(x) getc (x)
 104 # endif
 105
 106 # if HAVE_DECL_GETCHAR_UNLOCKED
 107 #  undef getchar
 108 #  define getchar() getchar_unlocked ()
 109 # else
 110 #  define getchar_unlocked() getchar ()
 111 # endif
 112
 113 # if HAVE_DECL_PUTC_UNLOCKED
 114 #  undef putc
 115 #  define putc(x,y) putc_unlocked (x,y)
 116 # else
 117 #  define putc_unlocked(x,y) putc (x,y)
 118 # endif
 119
 120 # if HAVE_DECL_PUTCHAR_UNLOCKED
 121 #  undef putchar
 122 #  define putchar(x) putchar_unlocked (x)
 123 # else
 124 #  define putchar_unlocked(x) putchar (x)
 125 # endif
 126
 127 # undef flockfile
 128 # define flockfile(x) ((void) 0)
 129
 130 # undef ftrylockfile
 131 # define ftrylockfile(x) 0
 132
 133 # undef funlockfile
 134 # define funlockfile(x) ((void) 0)
 135
 136 #endif /* UNLOCKED_IO_H */