SoX & pipe rewinding

[ojab <ojab@ojab.ru>]

[-- Attachment #1: Type: text/plain, Size: 207 bytes --]

Hi list,
SoX use some kind of hackery for pipe rewinding (see the attached file). 
So I have two questions:
1. If something like that possible using musl?
2. Is there any musl specific #define?

//wbr ojab


[-- Attachment #2: rewind_pipe.txt --]
[-- Type: text/plain, Size: 854 bytes --]


/* Hack to rewind pipes (a small amount).
 * Works by resetting the FILE buffer pointer */
static void UNUSED rewind_pipe(FILE * fp)
{
/* _FSTDIO is for Torek stdio (i.e. most BSD-derived libc's)
 * In theory, we no longer need to check _NEWLIB_VERSION or __APPLE__ */
#if defined _FSTDIO || defined _NEWLIB_VERSION || defined __APPLE__
  fp->_p -= AUTO_DETECT_SIZE;
  fp->_r += AUTO_DETECT_SIZE;
#elif defined __GLIBC__
  fp->_IO_read_ptr = fp->_IO_read_base;
#elif defined _MSC_VER || defined __MINGW_H || defined _ISO_STDIO_ISO_H
  fp->_ptr = fp->_base;
#else
  /* To fix this #error, either simply remove the #error line and live without
   * file-type detection with pipes, or add support for your compiler in the
   * lines above.  Test with cat monkey.au | ./sox --info - */
  #error FIX NEEDED HERE
  #define NO_REWIND_PIPE
  (void)fp;
#endif
}