support for uClibc

[Bruno Haible]

This ports some stdio primitives to uClibc. With this, the tests pass
in a non-cross i686-linux-uclibc build.

2007-06-08  Bruno Haible  <address@hidden>

        Port to uClibc.
        * lib/fbufmode.c (fbufmode): Add special code for uClibc.
        * lib/fpurge.c (fpurge): Likewise.
        * lib/freading.c (freading): Likewise.
        * lib/fseeko.c (rpl_fseeko): Likewise.
        * lib/fseterr.c (fseterr): Likewise.
        * lib/fwriting.c (fwriting): Likewise.
        * tests/test-fflush.c (main): Avoid a failure on uClibc.

*** lib/fbufmode.c      23 Apr 2007 08:01:35 -0000      1.2
--- lib/fbufmode.c      9 Jun 2007 01:15:39 -0000
***************
*** 62,67 ****
--- 62,73 ----
      return _IONBF;
    return _IOFBF;
  # endif
+ #elif defined __UCLIBC__            /* uClibc */
+   if (fp->__modeflags & __FLAG_LBF)
+     return _IOLBF;
+   if (fp->__modeflags & __FLAG_NBF)
+     return _IONBF;
+   return _IOFBF;
  #else
   #error "Please port gnulib fbufmode.c to your platform! Look at the setvbuf 
implementation."
  #endif
*** lib/fpurge.c        29 Apr 2007 12:16:55 -0000      1.5
--- lib/fpurge.c        9 Jun 2007 01:15:39 -0000
***************
*** 96,101 ****
--- 96,109 ----
    if (fp->_ptr != NULL)
      fp->_cnt = 0;
    return 0;
+ # elif defined __UCLIBC__           /* uClibc */
+ #  ifdef __STDIO_BUFFERS
+   if (fp->__modeflags & __FLAG_WRITING)
+     fp->__bufpos = fp->__bufstart;
+   else if (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING))
+     fp->__bufpos = fp->__bufread;
+ #  endif
+   return 0;
  # else
   #error "Please port gnulib fpurge.c to your platform! Look at the 
definitions of fflush, setvbuf and ungetc on your system, then report this to 
bug-gnulib."
  # endif
*** lib/freading.c      29 Apr 2007 08:25:15 -0000      1.2
--- lib/freading.c      9 Jun 2007 01:15:39 -0000
***************
*** 38,43 ****
--- 38,45 ----
    return (fp->_flags & __SRD) != 0;
  #elif defined _IOERR                /* AIX, HP-UX, IRIX, OSF/1, Solaris, 
mingw */
    return (fp->_flag & _IOREAD) != 0;
+ #elif defined __UCLIBC__            /* uClibc */
+   return (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) != 0;
  #else
   #error "Please port gnulib freading.c to your platform!"
  #endif
*** lib/fseeko.c        28 May 2007 14:44:47 -0000      1.6
--- lib/fseeko.c        9 Jun 2007 01:15:40 -0000
***************
*** 83,88 ****
--- 83,93 ----
    if (fp->_ptr == fp->_base
        && (fp->_ptr == NULL || fp->_cnt == 0))
  # endif
+ #elif defined __UCLIBC__            /* uClibc */
+   if (((fp->__modeflags & __FLAG_WRITING) == 0
+        || fp->__bufpos == fp->__bufstart)
+       && ((fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) == 0
+         || fp->__bufpos == fp->__bufread))
  #else
    #error "Please port gnulib fseeko.c to your platform! Look at the code in 
fpurge.c, then report this to bug-gnulib."
  #endif
*** lib/fseterr.c       23 Apr 2007 07:58:06 -0000      1.4
--- lib/fseterr.c       9 Jun 2007 01:15:40 -0000
***************
*** 38,43 ****
--- 38,45 ----
  # else
    fp->_flag |= _IOERR;
  # endif
+ #elif defined __UCLIBC__            /* uClibc */
+   fp->__modeflags |= __FLAG_ERROR;
  #elif 0                             /* unknown  */
    /* Portable fallback, based on an idea by Rich Felker.
       Wow! 6 system calls for something that is just a bit operation!
*** lib/fwriting.c      26 Apr 2007 13:16:50 -0000      1.1
--- lib/fwriting.c      9 Jun 2007 01:15:40 -0000
***************
*** 32,37 ****
--- 32,39 ----
    return (fp->_flags & __SWR) != 0;
  #elif defined _IOERR                /* AIX, HP-UX, IRIX, OSF/1, Solaris, 
mingw */
    return (fp->_flag & _IOWRT) != 0;
+ #elif defined __UCLIBC__            /* uClibc */
+   return (fp->__modeflags & __FLAG_WRITING) != 0;
  #else
   #error "Please port gnulib fwriting.c to your platform!"
  #endif
*** tests/test-fflush.c 28 May 2007 16:49:43 -0000      1.5
--- tests/test-fflush.c 9 Jun 2007 01:15:40 -0000
***************
*** 49,56 ****
        return 1;
      }
    /* For deterministic results, ensure f read a bigger buffer.
!      This is not the case on BeOS.  */
! #if !defined __BEOS__
    if (lseek (fd, 0, SEEK_CUR) == 5)
      {
        fputs ("Sample file was not buffered after fread.\n", stderr);
--- 49,56 ----
        return 1;
      }
    /* For deterministic results, ensure f read a bigger buffer.
!      This is not the case on BeOS, nor on uClibc.  */
! #if !(defined __BEOS__ || defined __UCLIBC__)
    if (lseek (fd, 0, SEEK_CUR) == 5)
      {
        fputs ("Sample file was not buffered after fread.\n", stderr);