| /* Copyright (C) 1991, 1992, 1995, 1997 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., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #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 |
| __vsnprintf (char *s, size_t maxlen, const char *format, va_list arg) |
| { |
| int done; |
| FILE f; |
| |
| /* We have to handle the case of MAXLEN == 0 special. */ |
| if (maxlen == 0) |
| return 0; |
| |
| memset ((void *) &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; |
| } |
| weak_alias (__vsnprintf, vsnprintf) |