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125 lines
4.4 KiB
C
125 lines
4.4 KiB
C
/* Copyright (C) 1994-2017 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 "strfile.h"
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static wint_t _IO_wstrn_overflow (_IO_FILE *fp, wint_t c) __THROW;
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static wint_t
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_IO_wstrn_overflow (_IO_FILE *fp, wint_t c)
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{
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/* When we come to here this means the user supplied buffer is
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filled. But since we must return the number of characters which
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would have been written in total we must provide a buffer for
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further use. We can do this by writing on and on in the overflow
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buffer in the _IO_wstrnfile structure. */
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_IO_wstrnfile *snf = (_IO_wstrnfile *) fp;
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if (fp->_wide_data->_IO_buf_base != snf->overflow_buf)
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{
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_IO_wsetb (fp, snf->overflow_buf,
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snf->overflow_buf + (sizeof (snf->overflow_buf)
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/ sizeof (wchar_t)), 0);
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fp->_wide_data->_IO_write_base = snf->overflow_buf;
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fp->_wide_data->_IO_read_base = snf->overflow_buf;
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fp->_wide_data->_IO_read_ptr = snf->overflow_buf;
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fp->_wide_data->_IO_read_end = (snf->overflow_buf
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+ (sizeof (snf->overflow_buf)
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/ sizeof (wchar_t)));
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}
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fp->_wide_data->_IO_write_ptr = snf->overflow_buf;
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fp->_wide_data->_IO_write_end = snf->overflow_buf;
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/* Since we are not really interested in storing the characters
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which do not fit in the buffer we simply ignore it. */
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return c;
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}
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const struct _IO_jump_t _IO_wstrn_jumps libio_vtable attribute_hidden =
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{
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JUMP_INIT_DUMMY,
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JUMP_INIT(finish, _IO_wstr_finish),
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JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstrn_overflow),
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JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow),
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JUMP_INIT(uflow, (_IO_underflow_t) _IO_wdefault_uflow),
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JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
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JUMP_INIT(xsputn, _IO_wdefault_xsputn),
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JUMP_INIT(xsgetn, _IO_wdefault_xsgetn),
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JUMP_INIT(seekoff, _IO_wstr_seekoff),
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JUMP_INIT(seekpos, _IO_default_seekpos),
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JUMP_INIT(setbuf, _IO_default_setbuf),
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JUMP_INIT(sync, _IO_default_sync),
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JUMP_INIT(doallocate, _IO_wdefault_doallocate),
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JUMP_INIT(read, _IO_default_read),
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JUMP_INIT(write, _IO_default_write),
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JUMP_INIT(seek, _IO_default_seek),
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JUMP_INIT(close, _IO_default_close),
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JUMP_INIT(stat, _IO_default_stat),
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JUMP_INIT(showmanyc, _IO_default_showmanyc),
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JUMP_INIT(imbue, _IO_default_imbue)
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};
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int
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_IO_vswprintf (wchar_t *string, _IO_size_t maxlen, const wchar_t *format,
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_IO_va_list args)
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{
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_IO_wstrnfile sf;
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int ret;
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struct _IO_wide_data wd;
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#ifdef _IO_MTSAFE_IO
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sf.f._sbf._f._lock = NULL;
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#endif
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if (maxlen == 0)
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/* Since we have to write at least the terminating L'\0' a buffer
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length of zero always makes the function fail. */
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return -1;
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_IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, 0, &wd, &_IO_wstrn_jumps);
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_IO_fwide (&sf.f._sbf._f, 1);
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string[0] = L'\0';
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_IO_wstr_init_static (&sf.f._sbf._f, string, maxlen - 1, string);
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ret = _IO_vfwprintf ((_IO_FILE *) &sf.f._sbf, format, args);
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if (sf.f._sbf._f._wide_data->_IO_buf_base == sf.overflow_buf)
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/* ISO C99 requires swprintf/vswprintf to return an error if the
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output does not fit in the provided buffer. */
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return -1;
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/* Terminate the string. */
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*sf.f._sbf._f._wide_data->_IO_write_ptr = '\0';
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return ret;
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}
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weak_alias (_IO_vswprintf, __vswprintf)
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ldbl_weak_alias (_IO_vswprintf, vswprintf)
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