libc/stdio/fwrite.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
  11 #ifdef __DO_UNLOCKED
  12
  13 size_t fwrite_unlocked(const void * __restrict ptr, size_t size,
  14                                                  size_t nmemb, register FILE * __restrict stream)
  15 {
  16         __STDIO_STREAM_VALIDATE(stream);
  17
  18         /* Note: If nmbem * size > SIZE_MAX then there is an application
  19          * bug since no array can be larger than SIZE_MAX in size. */
  20
  21         if ((__STDIO_STREAM_IS_NARROW_WRITING(stream)
  22                  || !__STDIO_STREAM_TRANS_TO_WRITE(stream, __FLAG_NARROW))
  23                 && size && nmemb
  24                 ) {
  25
  26                 if (nmemb <= (SIZE_MAX / size)) {
  27                         return __stdio_fwrite((const unsigned char *) ptr,
  28                                                                   size*nmemb, stream) / size;
  29                 }
  30
  31                 __STDIO_STREAM_SET_ERROR(stream);
  32                 __set_errno(EINVAL);
  33         }
  34
  35         return 0;
  36 }
  37 libc_hidden_def(fwrite_unlocked)
  38
  39 #ifndef __UCLIBC_HAS_THREADS__
  40 strong_alias(fwrite_unlocked,fwrite)
  41 libc_hidden_def(fwrite)
  42 #endif
  43
  44 #elif defined __UCLIBC_HAS_THREADS__
  45
  46 size_t fwrite(const void * __restrict ptr, size_t size,
  47                           size_t nmemb, register FILE * __restrict stream)
  48 {
  49         size_t retval;
  50         __STDIO_AUTO_THREADLOCK_VAR;
  51
  52         __STDIO_AUTO_THREADLOCK(stream);
  53
  54         retval = fwrite_unlocked(ptr, size, nmemb, stream);
  55
  56         __STDIO_AUTO_THREADUNLOCK(stream);
  57
  58         return retval;
  59 }
  60 libc_hidden_def(fwrite)
  61
  62 #endif