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-rw-r--r--stdio-common/vsnprintf.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/stdio-common/vsnprintf.c b/stdio-common/vsnprintf.c
new file mode 100644
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--- /dev/null
+++ b/stdio-common/vsnprintf.c
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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;
+}