kc3-lang/gnulib/lib/freadptr.c

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• Hash : 03400ebf
  Author :
  Date : 2008-03-10T00:23:20
  

  Extend freadptr to return also the buffer size.
  

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• lib/freadptr.c

• /* Retrieve information about a FILE stream.
     Copyright (C) 2007-2008 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "freadptr.h"
  
  const char *
  freadptr (FILE *fp, size_t *sizep)
  {
    size_t size;
  
    /* Keep this code in sync with freadahead!  */
  #if defined _IO_ferror_unlocked     /* GNU libc, BeOS */
    if (fp->_IO_write_ptr > fp->_IO_write_base)
      return NULL;
    size = fp->_IO_read_end - fp->_IO_read_ptr;
    if (size == 0)
      return NULL;
    *sizep = size;
    return (const char *) fp->_IO_read_ptr;
  #elif defined __sferror             /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
    if ((fp->_flags & __SWR) != 0 || fp->_r < 0)
      return NULL;
    size = fp->_r;
    if (size == 0)
      return NULL;
    *sizep = size;
    return (const char *) fp->_p;
  #elif defined _IOERR                /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
  # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
  #  define fp_ ((struct { unsigned char *_ptr; \
  			 unsigned char *_base; \
  			 unsigned char *_end; \
  			 long _cnt; \
  			 int _file; \
  			 unsigned int _flag; \
  		       } *) fp)
    if ((fp_->_flag & _IOWRT) != 0)
      return NULL;
    size = fp_->_cnt;
    if (size == 0)
      return NULL;
    *sizep = size;
    return (const char *) fp_->_ptr;
  # else
    if ((fp->_flag & _IOWRT) != 0)
      return NULL;
    size = fp->_cnt;
    if (size == 0)
      return NULL;
    *sizep = size;
    return (const char *) fp->_ptr;
  # endif
  #elif defined __UCLIBC__            /* uClibc */
  # ifdef __STDIO_BUFFERS
    if (fp->__modeflags & __FLAG_WRITING)
      return NULL;
    size = fp->__bufread - fp->__bufpos;
    if (size == 0)
      return NULL;
    *sizep = size;
    return (const char *) fp->__bufpos;
  # else
    return NULL;
  # endif
  #elif defined __QNX__               /* QNX */
    if ((fp->_Mode & 0x2000 /* _MWRITE */) != 0)
      return NULL;
    /* fp->_Buf <= fp->_Next <= fp->_Rend */
    size = fp->_Rend - fp->_Next;
    if (size == 0)
      return NULL;
    *sizep = size;
    return (const char *) fp->_Next;
  #else
   #error "Please port gnulib freadptr.c to your platform! Look at the definition of fflush, fread, getc, getc_unlocked on your system, then report this to bug-gnulib."
  #endif
  }
  

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