libc/stdio/getchar.c

   1 /* Copyright (C) 2004       Manuel Novoa III    <mjn3@codepoet.org>
   2  *
   3  * GNU Library General Public License (LGPL) version 2 or later.
   4  *
   5  * Dedicated to Toni.  See uClibc/DEDICATION.mjn3 for details.
   6  */
   7
   8 #include "_stdio.h"
   9
  10 /* libc_hidden_proto(__fgetc_unlocked) */
  11
  12 #undef getchar
  13 #ifdef __DO_UNLOCKED
  14
  15 /* the only use of the hidden getchar_unlocked is in gets.c */
  16 #undef getchar_unlocked
  17 /* libc_hidden_proto(getchar_unlocked) */
  18 int getchar_unlocked(void)
  19 {
  20         register FILE *stream = stdin;
  21
  22         return __GETC_UNLOCKED_MACRO(stream);
  23 }
  24 libc_hidden_def(getchar_unlocked)
  25
  26 #ifndef __UCLIBC_HAS_THREADS__
  27 strong_alias(getchar_unlocked,getchar)
  28 #endif
  29
  30 #elif defined __UCLIBC_HAS_THREADS__
  31
  32 int getchar(void)
  33 {
  34         register FILE *stream = stdin;
  35
  36         if (stream->__user_locking != 0) {
  37                 return __GETC_UNLOCKED_MACRO(stream);
  38         } else {
  39                 int retval;
  40                 __STDIO_ALWAYS_THREADLOCK(stream);
  41                 retval = __GETC_UNLOCKED_MACRO(stream);
  42                 __STDIO_ALWAYS_THREADUNLOCK(stream);
  43                 return retval;
  44         }
  45 }
  46
  47 #endif