libc/stdio/vdprintf.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 <features.h>
   9
  10 #ifdef __USE_GNU
  11 #include "_stdio.h"
  12 #include <stdarg.h>
  13
  14
  15 int vdprintf(int filedes, const char * __restrict format, va_list arg)
  16 {
  17         FILE f;
  18         int rv;
  19 #ifdef __STDIO_BUFFERS
  20         char buf[64];                           /* TODO: provide _optional_ buffering? */
  21
  22         f.__bufend = (unsigned char *) buf + sizeof(buf);
  23         f.__bufstart = (unsigned char *) buf;
  24         __STDIO_STREAM_DISABLE_GETC(&f);
  25         __STDIO_STREAM_DISABLE_PUTC(&f);
  26         __STDIO_STREAM_INIT_BUFREAD_BUFPOS(&f);
  27 #endif
  28
  29         f.__filedes = filedes;
  30         f.__modeflags = (__FLAG_NARROW|__FLAG_WRITEONLY|__FLAG_WRITING);
  31
  32 #ifdef __UCLIBC_HAS_WCHAR__
  33         f.__ungot_width[0] = 0;
  34 #endif
  35 #ifdef __STDIO_MBSTATE
  36         __INIT_MBSTATE(&(f.__state));
  37 #endif
  38
  39 /* _vfprintf_internal doesn't do any locking, locking init is here
  40  * only because of fflush_unlocked. TODO? */
  41 #if (defined(__STDIO_BUFFERS) || defined(__USE_OLD_VFPRINTF__)) && defined(__UCLIBC_HAS_THREADS__)
  42         f.__user_locking = 1;           /* Set user locking. */
  43         STDIO_INIT_MUTEX(f.__lock);
  44 #endif
  45         f.__nextopen = NULL;
  46
  47 #ifdef __USE_OLD_VFPRINTF__
  48         rv = vfprintf(&f, format, arg);
  49 #else
  50         rv = _vfprintf_internal(&f, format, arg);
  51 #endif
  52
  53 #ifdef __STDIO_BUFFERS
  54         /* If not buffering, then fflush is unnecessary. */
  55         if ((rv > 0) && fflush_unlocked(&f)) {
  56                 rv = -1;
  57         }
  58 #endif
  59
  60         assert(rv >= -1);
  61
  62         return rv;
  63 }
  64 libc_hidden_def(vdprintf)
  65 #endif