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137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/* Copyright (C) 1994, 1997 Free Software Foundation, Inc.
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This file is part of the GNU IO Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2, or (at
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your option) any later version.
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This library is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does
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not cause the resulting executable to be covered by the GNU General
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Public License. This exception does not however invalidate any
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other reasons why the executable file might be covered by the GNU
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General Public License. */
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#include "libioP.h"
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#include "strfile.h"
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typedef struct
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{
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_IO_strfile f;
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/* This is used for the characters which do not fit in the buffer
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provided by the user. */
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char overflow_buf[64];
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} _IO_strnfile;
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static int _IO_strn_overflow __P ((_IO_FILE *fp, int c));
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static int
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_IO_strn_overflow (fp, c)
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_IO_FILE *fp;
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int 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_strnfile structure. */
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_IO_strnfile *snf = (_IO_strnfile *) fp;
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if (fp->_IO_buf_base != snf->overflow_buf)
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{
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/* Terminate the string. We know that there is room for at
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least one more character since we initialized the stream with
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a size to make this possible. */
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*fp->_IO_write_ptr = '\0';
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_IO_setb (fp, snf->overflow_buf,
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snf->overflow_buf + sizeof (snf->overflow_buf), 0);
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fp->_IO_write_base = snf->overflow_buf;
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fp->_IO_read_base = snf->overflow_buf;
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fp->_IO_read_ptr = snf->overflow_buf;
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fp->_IO_read_end = snf->overflow_buf + sizeof (snf->overflow_buf);
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}
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fp->_IO_write_ptr = snf->overflow_buf;
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fp->_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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static struct _IO_jump_t _IO_strn_jumps =
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{
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JUMP_INIT_DUMMY,
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JUMP_INIT(finish, _IO_str_finish),
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JUMP_INIT(overflow, _IO_strn_overflow),
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JUMP_INIT(underflow, _IO_str_underflow),
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JUMP_INIT(uflow, _IO_default_uflow),
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JUMP_INIT(pbackfail, _IO_str_pbackfail),
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JUMP_INIT(xsputn, _IO_default_xsputn),
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JUMP_INIT(xsgetn, _IO_default_xsgetn),
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JUMP_INIT(seekoff, _IO_str_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_default_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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};
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int
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_IO_vsnprintf (string, maxlen, format, args)
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char *string;
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_IO_size_t maxlen;
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const char *format;
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_IO_va_list args;
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{
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_IO_strnfile sf;
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int ret;
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#ifdef _IO_MTSAFE_IO
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_IO_lock_t lock;
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sf.f._sbf._f._lock = &lock;
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#endif
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/* We need to handle the special case where MAXLEN is 0. Use the
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overflow buffer right from the start. */
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if (maxlen == 0)
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{
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string = sf.overflow_buf;
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maxlen = sizeof (sf.overflow_buf);
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}
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_IO_init ((_IO_FILE *) &sf, 0);
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_IO_JUMPS ((_IO_FILE *) &sf) = &_IO_strn_jumps;
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_IO_str_init_static ((_IO_FILE *) &sf, string, maxlen - 1, string);
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ret = _IO_vfprintf ((_IO_FILE *) &sf, format, args);
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if (sf.f._sbf._f._IO_buf_base != sf.overflow_buf)
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*sf.f._sbf._f._IO_write_ptr = '\0';
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return ret;
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}
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#ifdef weak_alias
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weak_alias (_IO_vsnprintf, __vsnprintf)
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weak_alias (_IO_vsnprintf, vsnprintf)
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#endif
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