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- /* Copyright (C) 1991, 1992 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 Library General Public License as
- published by the Free Software Foundation; either version 2 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
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <ansidecl.h>
- #include <stdarg.h>
- #include <stdio.h>
- #include <string.h>
-
-
- /*
- * Write formatted output to S according to the format string
- * FORMAT, using the argument list in ARG, writing no more
- * than MAXLEN characters.
- */
- int
- DEFUN(vsnprintf, (s, maxlen, format, arg),
- char *s AND size_t maxlen AND CONST char *format AND va_list arg)
- {
- int done;
- FILE f;
-
- memset((PTR) &f, 0, sizeof(f));
- f.__magic = _IOMAGIC;
- f.__mode.__write = 1;
- /* The buffer size is one less than MAXLEN
- so we have space for the null terminator. */
- f.__bufp = f.__buffer = (char *) s;
- f.__bufsize = maxlen - 1;
- f.__put_limit = f.__buffer + f.__bufsize;
- f.__get_limit = f.__buffer;
- /* After the buffer is full (MAXLEN characters have been written),
- any more characters written will go to the bit bucket. */
- f.__room_funcs = __default_room_functions;
- f.__io_funcs.__write = NULL;
- f.__seen = 1;
-
- done = vfprintf(&f, format, arg);
- *f.__bufp = '\0';
-
- return done;
- }
-