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Diffstat (limited to 'libio/iogetwline.c')
| -rw-r--r-- | libio/iogetwline.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/libio/iogetwline.c b/libio/iogetwline.c new file mode 100644 index 0000000000..402158a4ef --- /dev/null +++ b/libio/iogetwline.c @@ -0,0 +1,120 @@ +/* Copyright (C) 1993, 1997, 1998, 1999 Free Software Foundation, Inc. + This file is part of the GNU IO Library. + + This library 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 2, or (at + your option) any later version. + + This 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this library; see the file COPYING. If not, write to + the Free Software Foundation, 59 Temple Place - Suite 330, Boston, + MA 02111-1307, USA. + + As a special exception, if you link this library with files + compiled with a GNU compiler to produce an executable, this does + not cause the resulting executable to be covered by the GNU General + Public License. This exception does not however invalidate any + other reasons why the executable file might be covered by the GNU + General Public License. */ + +#include "libioP.h" +#include <string.h> +#include <wchar.h> + +#if defined _LIBC || !_G_HAVE_IO_GETLINE_INFO + +_IO_size_t +_IO_getwline (fp, buf, n, delim, extract_delim) + _IO_FILE *fp; + wchar_t *buf; + _IO_size_t n; + wint_t delim; + int extract_delim; +{ + return _IO_getwline_info (fp, buf, n, delim, extract_delim, (wint_t *) 0); +} + +/* 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_getwline_info (fp, buf, n, delim, extract_delim, eof) + _IO_FILE *fp; + wchar_t *buf; + _IO_size_t n; + wint_t delim; + int extract_delim; + wint_t *eof; +{ + wchar_t *ptr = buf; + if (eof != NULL) + *eof = 0; + while (n != 0) + { + _IO_ssize_t len = (fp->_wide_data->_IO_read_end + - fp->_wide_data->_IO_read_ptr); + if (len <= 0) + { + wint_t wc = __wuflow (fp); + if (wc == WEOF) + { + if (eof) + *eof = wc; + break; + } + if (wc == delim) + { + if (extract_delim > 0) + *ptr++ = wc; + else if (extract_delim < 0) + _IO_sputbackc (fp, wc); + return ptr - buf; + if (extract_delim > 0) + ++len; + } + *ptr++ = wc; + n--; + } + else + { + wchar_t *t; + if ((_IO_size_t) len >= n) + len = n; + t = (wchar_t *) memchr ((void *) fp->_wide_data->_IO_read_ptr, + delim, len); + if (t != NULL) + { + _IO_size_t old_len = ptr - buf; + len = t - fp->_wide_data->_IO_read_ptr; + if (extract_delim >= 0) + { + ++t; + if (extract_delim > 0) + ++len; + } + memcpy ((void *) ptr, (void *) fp->_wide_data->_IO_read_ptr, + len); + fp->_wide_data->_IO_read_ptr = t; + return old_len + len; + } + memcpy ((void *) ptr, (void *) fp->_wide_data->_IO_read_ptr, len); + fp->_wide_data->_IO_read_ptr += len; + ptr += len; + n -= len; + } + } + return ptr - buf; +} + +#endif /* Defined _LIBC || !_G_HAVE_IO_GETLINE_INFO */ |