-/*
-Copyright (C) 1994 Free Software Foundation
-
-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. */
+/* Copyright (C) 1994-2016 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. */
#include "libioP.h"
#include "strfile.h"
+static int _IO_strn_overflow (_IO_FILE *fp, int c) __THROW;
+
+static int
+_IO_strn_overflow (_IO_FILE *fp, int c)
+{
+ /* When we come to here this means the user supplied buffer is
+ filled. But since we must return the number of characters which
+ would have been written in total we must provide a buffer for
+ further use. We can do this by writing on and on in the overflow
+ buffer in the _IO_strnfile structure. */
+ _IO_strnfile *snf = (_IO_strnfile *) fp;
+
+ if (fp->_IO_buf_base != snf->overflow_buf)
+ {
+ /* Terminate the string. We know that there is room for at
+ least one more character since we initialized the stream with
+ a size to make this possible. */
+ *fp->_IO_write_ptr = '\0';
+
+ _IO_setb (fp, snf->overflow_buf,
+ snf->overflow_buf + sizeof (snf->overflow_buf), 0);
+
+ fp->_IO_write_base = snf->overflow_buf;
+ fp->_IO_read_base = snf->overflow_buf;
+ fp->_IO_read_ptr = snf->overflow_buf;
+ fp->_IO_read_end = snf->overflow_buf + sizeof (snf->overflow_buf);
+ }
+
+ fp->_IO_write_ptr = snf->overflow_buf;
+ fp->_IO_write_end = snf->overflow_buf;
+
+ /* Since we are not really interested in storing the characters
+ which do not fit in the buffer we simply ignore it. */
+ return c;
+}
+
+
+const struct _IO_jump_t _IO_strn_jumps attribute_hidden =
+{
+ JUMP_INIT_DUMMY,
+ JUMP_INIT(finish, _IO_str_finish),
+ JUMP_INIT(overflow, _IO_strn_overflow),
+ JUMP_INIT(underflow, _IO_str_underflow),
+ JUMP_INIT(uflow, _IO_default_uflow),
+ JUMP_INIT(pbackfail, _IO_str_pbackfail),
+ JUMP_INIT(xsputn, _IO_default_xsputn),
+ JUMP_INIT(xsgetn, _IO_default_xsgetn),
+ JUMP_INIT(seekoff, _IO_str_seekoff),
+ JUMP_INIT(seekpos, _IO_default_seekpos),
+ JUMP_INIT(setbuf, _IO_default_setbuf),
+ JUMP_INIT(sync, _IO_default_sync),
+ JUMP_INIT(doallocate, _IO_default_doallocate),
+ JUMP_INIT(read, _IO_default_read),
+ JUMP_INIT(write, _IO_default_write),
+ JUMP_INIT(seek, _IO_default_seek),
+ JUMP_INIT(close, _IO_default_close),
+ JUMP_INIT(stat, _IO_default_stat),
+ JUMP_INIT(showmanyc, _IO_default_showmanyc),
+ JUMP_INIT(imbue, _IO_default_imbue)
+};
+
+
int
-_IO_vsnprintf (string, maxlen, format, args)
- char *string;
- _IO_size_t maxlen;
- const char *format;
- _IO_va_list args;
+_IO_vsnprintf (char *string, _IO_size_t maxlen, const char *format,
+ _IO_va_list args)
{
- _IO_strfile sf;
+ _IO_strnfile sf;
int ret;
#ifdef _IO_MTSAFE_IO
- _IO_lock_t lock;
- sf._sbf._f._lock = &lock;
+ sf.f._sbf._f._lock = NULL;
#endif
- _IO_init ((_IO_FILE *) &sf, 0);
- _IO_JUMPS ((_IO_FILE *) &sf) = &_IO_str_jumps;
- _IO_str_init_static ((_IO_FILE *) &sf, string, maxlen - 1, string);
- ret = _IO_vfprintf ((_IO_FILE *) &sf, format, args);
- *((_IO_FILE *) &sf)->_IO_write_ptr = '\0';
+
+ /* We need to handle the special case where MAXLEN is 0. Use the
+ overflow buffer right from the start. */
+ if (maxlen == 0)
+ {
+ string = sf.overflow_buf;
+ maxlen = sizeof (sf.overflow_buf);
+ }
+
+ _IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
+ _IO_JUMPS (&sf.f._sbf) = &_IO_strn_jumps;
+ string[0] = '\0';
+ _IO_str_init_static_internal (&sf.f, string, maxlen - 1, string);
+ ret = _IO_vfprintf (&sf.f._sbf._f, format, args);
+
+ if (sf.f._sbf._f._IO_buf_base != sf.overflow_buf)
+ *sf.f._sbf._f._IO_write_ptr = '\0';
return ret;
}
-weak_alias (_IO_vsnprintf, __vsnprintf)
-weak_alias (_IO_vsnprintf, vsnprintf)
+ldbl_weak_alias (_IO_vsnprintf, __vsnprintf)
+ldbl_weak_alias (_IO_vsnprintf, vsnprintf)
projects / thirdparty / glibc.git / blobdiff