libc/stdio/ftello.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 #ifndef __DO_LARGEFILE
  11 # define FTELL         ftell
  12 # define OFFSET_TYPE   long int
  13 #endif
  14
  15 OFFSET_TYPE FTELL(register FILE *stream)
  16 {
  17 #if !defined(__DO_LARGEFILE)
  18
  19         __offmax_t pos = ftello64(stream);
  20
  21         if ((sizeof(long) >= sizeof(__offmax_t)) || (((long) pos) == pos)) {
  22                 return ((long) pos);
  23         } else {
  24                 __set_errno(EOVERFLOW);
  25                 return -1;
  26         }
  27
  28 #else
  29
  30         __offmax_t pos = 0;
  31         __STDIO_AUTO_THREADLOCK_VAR;
  32
  33         __STDIO_AUTO_THREADLOCK(stream);
  34
  35         __STDIO_STREAM_VALIDATE(stream);
  36
  37         if ((__SEEK(stream, &pos,
  38                                 ((__STDIO_STREAM_IS_WRITING(stream)
  39                                   && (stream->__modeflags & __FLAG_APPEND))
  40                                  ? SEEK_END : SEEK_CUR)) < 0)
  41                 || (__stdio_adjust_position(stream, &pos) < 0)) {
  42                 pos = -1;
  43         }
  44
  45         __STDIO_AUTO_THREADUNLOCK(stream);
  46
  47         return pos;
  48
  49 #endif
  50 }
  51
  52 #ifdef __DO_LARGEFILE
  53 libc_hidden_def(ftello64)
  54 #else
  55 libc_hidden_def(ftell)
  56 strong_alias_untyped(ftell,ftello)
  57 #endif