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 libc_hidden_proto(fwrite_unlocked)
  11
  12 #ifdef __DO_UNLOCKED
  13
  14 size_t fwrite_unlocked(const void * __restrict ptr, size_t size,
  15                                                  size_t nmemb, register FILE * __restrict stream)
  16 {
  17         __STDIO_STREAM_VALIDATE(stream);
  18
  19         /* Note: If nmbem * size > SIZE_MAX then there is an application
  20          * bug since no array can be larger than SIZE_MAX in size. */
  21
  22         if ((__STDIO_STREAM_IS_NARROW_WRITING(stream)
  23                  || !__STDIO_STREAM_TRANS_TO_WRITE(stream, __FLAG_NARROW))
  24                 && size && nmemb
  25                 ) {
  26
  27                 if (nmemb <= (SIZE_MAX / size)) {
  28                         return __stdio_fwrite((const unsigned char *) ptr,
  29                                                                   size*nmemb, stream) / size;
  30                 }
  31
  32                 __STDIO_STREAM_SET_ERROR(stream);
  33                 __set_errno(EINVAL);
  34         }
  35
  36         return 0;
  37 }
  38 libc_hidden_def(fwrite_unlocked)
  39
  40 #ifndef __UCLIBC_HAS_THREADS__
  41 strong_alias(fwrite_unlocked,fwrite)
  42 libc_hidden_proto(fwrite)
  43 libc_hidden_def(fwrite)
  44 #endif
  45
  46 #elif defined __UCLIBC_HAS_THREADS__
  47
  48 size_t fwrite(const void * __restrict ptr, size_t size,
  49                           size_t nmemb, register FILE * __restrict stream)
  50 {
  51         size_t retval;
  52         __STDIO_AUTO_THREADLOCK_VAR;
  53
  54         __STDIO_AUTO_THREADLOCK(stream);
  55
  56         retval = fwrite_unlocked(ptr, size, nmemb, stream);
  57
  58         __STDIO_AUTO_THREADUNLOCK(stream);
  59
  60         return retval;
  61 }
  62 libc_hidden_proto(fwrite)
  63 libc_hidden_def(fwrite)
  64
  65 #endif