libio/iogetwline.c

   1 /* Copyright (C) 1993, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   2    This file is part of the GNU IO Library.
   3
   4    This library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public License as
   6    published by the Free Software Foundation; either version 2, or (at
   7    your option) any later version.
   8
   9    This library is distributed in the hope that it will be useful, but
  10    WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this library; see the file COPYING.  If not, write to
  16    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  17    MA 02111-1307, USA.
  18
  19    As a special exception, if you link this library with files
  20    compiled with a GNU compiler to produce an executable, this does
  21    not cause the resulting executable to be covered by the GNU General
  22    Public License.  This exception does not however invalidate any
  23    other reasons why the executable file might be covered by the GNU
  24    General Public License.  */
  25
  26 #include "libioP.h"
  27 #include <string.h>
  28 #include <wchar.h>
  29
  30 #ifdef _LIBC
  31 # define wmemcpy __wmemcpy
  32 #endif
  33
  34 #if defined _LIBC || !_G_HAVE_IO_GETLINE_INFO
  35
  36 _IO_size_t
  37 _IO_getwline (fp, buf, n, delim, extract_delim)
  38      _IO_FILE *fp;
  39      wchar_t *buf;
  40      _IO_size_t n;
  41      wint_t delim;
  42      int extract_delim;
  43 {
  44   return _IO_getwline_info (fp, buf, n, delim, extract_delim, (wint_t *) 0);
  45 }
  46
  47 /* Algorithm based on that used by Berkeley pre-4.4 fgets implementation.
  48
  49    Read chars into buf (of size n), until delim is seen.
  50    Return number of chars read (at most n).
  51    Does not put a terminating '\0' in buf.
  52    If extract_delim < 0, leave delimiter unread.
  53    If extract_delim > 0, insert delim in output. */
  54
  55 _IO_size_t
  56 _IO_getwline_info (fp, buf, n, delim, extract_delim, eof)
  57      _IO_FILE *fp;
  58      wchar_t *buf;
  59      _IO_size_t n;
  60      wint_t delim;
  61      int extract_delim;
  62      wint_t *eof;
  63 {
  64   wchar_t *ptr = buf;
  65   if (eof != NULL)
  66     *eof = 0;
  67   if (__builtin_expect (fp->_mode, 1) == 0)
  68     _IO_fwide (fp, 1);
  69   while (n != 0)
  70     {
  71       _IO_ssize_t len = (fp->_wide_data->_IO_read_end
  72                          - fp->_wide_data->_IO_read_ptr);
  73       if (len <= 0)
  74         {
  75           wint_t wc = __wuflow (fp);
  76           if (wc == WEOF)
  77             {
  78               if (eof)
  79                 *eof = wc;
  80               break;
  81             }
  82           if (wc == delim)
  83             {
  84               if (extract_delim > 0)
  85                 *ptr++ = wc;
  86               else if (extract_delim < 0)
  87                 _IO_sputbackc (fp, wc);
  88               return ptr - buf;
  89               if (extract_delim > 0)
  90                 ++len;
  91             }
  92           *ptr++ = wc;
  93           n--;
  94         }
  95       else
  96         {
  97           wchar_t *t;
  98           if ((_IO_size_t) len >= n)
  99             len = n;
 100           t = wmemchr ((void *) fp->_wide_data->_IO_read_ptr, delim, len);
 101           if (t != NULL)
 102             {
 103               _IO_size_t old_len = ptr - buf;
 104               len = t - fp->_wide_data->_IO_read_ptr;
 105               if (extract_delim >= 0)
 106                 {
 107                   ++t;
 108                   if (extract_delim > 0)
 109                     ++len;
 110                 }
 111               wmemcpy ((void *) ptr, (void *) fp->_wide_data->_IO_read_ptr,
 112                        len);
 113               fp->_wide_data->_IO_read_ptr = t;
 114               return old_len + len;
 115             }
 116           wmemcpy ((void *) ptr, (void *) fp->_wide_data->_IO_read_ptr, len);
 117           fp->_wide_data->_IO_read_ptr += len;
 118           ptr += len;
 119           n -= len;
 120         }
 121     }
 122   return ptr - buf;
 123 }
 124
 125 #endif /* Defined _LIBC || !_G_HAVE_IO_GETLINE_INFO */