text: /* Copyright (C) 1993-2017 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library 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
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <http://www.gnu.org/licenses/>.
  
     As a special exception, if you link the code in this file with
     files compiled with a GNU compiler to produce an executable,
     that does not cause the resulting executable to be covered by
     the GNU Lesser General Public License.  This exception does not
     however invalidate any other reasons why the executable file
     might be covered by the GNU Lesser General Public License.
     This exception applies to code released by its copyright holders
     in files containing the exception.  */
  
  #define __OPTIMIZE__ 1
  #include <libc-symbols.h>
  #include <stdint.h>
  #include <glibc-errno.h>
  #include <glibc-libio/libioP.h>
  #include <glibc-stdio.h>
  #include <glibc-string.h>
  
  _IO_size_t
  _IO_getline (_IO_FILE *fp, char *buf, _IO_size_t n, int delim,
  	     int extract_delim)
  {
    return _IO_getline_info (fp, buf, n, delim, extract_delim, (int *) 0);
  }
  libc_hidden_def (_IO_getline)
  
  /* Algorithm based on that used by Berkeley pre-4.4 fgets implementation.
  
     Read chars into buf (of size n), until delim is seen.
     Return number of chars read (at most n).
     Does not put a terminating '\0' in buf.
     If extract_delim < 0, leave delimiter unread.
     If extract_delim > 0, insert delim in output. */
  
  _IO_size_t
  _IO_getline_info (_IO_FILE *fp, char *buf, _IO_size_t n, int delim,
  		  int extract_delim, int *eof)
  {
    char *ptr = buf;
    if (eof != NULL)
      *eof = 0;
    if (__builtin_expect (fp->_mode, -1) == 0)
      _IO_fwide (fp, -1);
    while (n != 0)
      {
        _IO_ssize_t len = fp->_IO_read_end - fp->_IO_read_ptr;
        if (len <= 0)
  	{
  	  int c = __uflow (fp);
  	  if (c == EOF)
  	    {
  	      if (eof)
  		*eof = c;
  	      break;
  	    }
  	  if (c == delim)
  	    {
   	      if (extract_delim > 0)
  		*ptr++ = c;
  	      else if (extract_delim < 0)
  		_IO_sputbackc (fp, c);
  	      if (extract_delim > 0)
  		++len;
  	      return ptr - buf;
  	    }
  	  *ptr++ = c;
  	  n--;
  	}
        else
  	{
  	  char *t;
  	  if ((_IO_size_t) len >= n)
  	    len = n;
  	  t = (char *) memchr ((void *) fp->_IO_read_ptr, delim, len);
  	  if (t != NULL)
  	    {
  	      _IO_size_t old_len = ptr-buf;
  	      len = t - fp->_IO_read_ptr;
  	      if (extract_delim >= 0)
  		{
  		  ++t;
  		  if (extract_delim > 0)
  		    ++len;
  		}
  	      memcpy ((void *) ptr, (void *) fp->_IO_read_ptr, len);
  	      fp->_IO_read_ptr = t;
  	      return old_len + len;
  	    }
  	  memcpy ((void *) ptr, (void *) fp->_IO_read_ptr, len);
  	  fp->_IO_read_ptr += len;
  	  ptr += len;
  	  n -= len;
  	}
      }
    return ptr - buf;
  }
  libc_hidden_def (_IO_getline_info)
  