110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
/* Copyright (C) 1993-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include "libioP.h"
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#include <string.h>
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#include <wchar.h>
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_IO_size_t
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_IO_getwline (_IO_FILE *fp, wchar_t *buf, _IO_size_t n, wint_t delim,
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int extract_delim)
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{
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return _IO_getwline_info (fp, buf, n, delim, extract_delim, (wint_t *) 0);
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}
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/* Algorithm based on that used by Berkeley pre-4.4 fgets implementation.
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Read chars into buf (of size n), until delim is seen.
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Return number of chars read (at most n).
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Does not put a terminating '\0' in buf.
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If extract_delim < 0, leave delimiter unread.
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If extract_delim > 0, insert delim in output. */
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_IO_size_t
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_IO_getwline_info (_IO_FILE *fp, wchar_t *buf, _IO_size_t n, wint_t delim,
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int extract_delim, wint_t *eof)
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{
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wchar_t *ptr = buf;
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if (eof != NULL)
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*eof = 0;
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if (__builtin_expect (fp->_mode, 1) == 0)
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_IO_fwide (fp, 1);
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while (n != 0)
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{
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_IO_ssize_t len = (fp->_wide_data->_IO_read_end
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- fp->_wide_data->_IO_read_ptr);
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if (len <= 0)
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{
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wint_t wc = __wuflow (fp);
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if (wc == WEOF)
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{
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if (eof)
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*eof = wc;
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break;
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}
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if (wc == delim)
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{
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if (extract_delim > 0)
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*ptr++ = wc;
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else if (extract_delim < 0)
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_IO_sputbackc (fp, wc);
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if (extract_delim > 0)
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++len;
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return ptr - buf;
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}
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*ptr++ = wc;
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n--;
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}
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else
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{
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wchar_t *t;
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if ((_IO_size_t) len >= n)
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len = n;
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t = wmemchr ((void *) fp->_wide_data->_IO_read_ptr, delim, len);
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if (t != NULL)
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{
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_IO_size_t old_len = ptr - buf;
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len = t - fp->_wide_data->_IO_read_ptr;
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if (extract_delim >= 0)
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{
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++t;
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if (extract_delim > 0)
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++len;
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}
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__wmemcpy ((void *) ptr, (void *) fp->_wide_data->_IO_read_ptr,
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len);
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fp->_wide_data->_IO_read_ptr = t;
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return old_len + len;
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}
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__wmemcpy ((void *) ptr, (void *) fp->_wide_data->_IO_read_ptr, len);
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fp->_wide_data->_IO_read_ptr += len;
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ptr += len;
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n -= len;
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}
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}
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return ptr - buf;
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}
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