1 files changed, 78 insertions, 0 deletions
diff --git a/sendmail/libsm/vsnprintf.c b/sendmail/libsm/vsnprintf.c
new file mode 100644
index 0000000..18a4635
--- /dev/null
+++ b/sendmail/libsm/vsnprintf.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
+ *      All rights reserved.
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the sendmail distribution.
+ */
+
+#include <sm/gen.h>
+SM_RCSID("@(#)$Id: vsnprintf.c,v 1.23 2001/09/11 04:04:49 gshapiro Exp $")
+#include <limits.h>
+#include <sm/io.h>
+#include "local.h"
+
+/*
+**  SM_VSNPRINTF -- format data for "output" into a string
+**
+**	Assigned 'str' to a "fake" file pointer. This allows common
+**	o/p formatting function sm_vprintf() to be used.
+**
+**	Parameters:
+**		str -- location for output
+**		n -- maximum size for o/p
+**		fmt -- format directives
+**		ap -- data unit vectors for use by 'fmt'
+**
+**	Results:
+**		result from sm_io_vfprintf()
+**
+**	Side Effects:
+**		Limits the size ('n') to INT_MAX.
+*/
+
+int
+sm_vsnprintf(str, n, fmt, ap)
+	char *str;
+	size_t n;
+	const char *fmt;
+	SM_VA_LOCAL_DECL
+{
+	int ret;
+	char dummy;
+	SM_FILE_T fake;
+
+	/* While snprintf(3) specifies size_t stdio uses an int internally */
+	if (n > INT_MAX)
+		n = INT_MAX;
+
+	/* Stdio internals do not deal correctly with zero length buffer */
+	if (n == 0)
+	{
+		str = &dummy;
+		n = 1;
+	}
+	fake.sm_magic = SmFileMagic;
+	fake.f_timeout = SM_TIME_FOREVER;
+	fake.f_timeoutstate = SM_TIME_BLOCK;
+	fake.f_file = -1;
+	fake.f_flags = SMWR | SMSTR;
+	fake.f_bf.smb_base = fake.f_p = (unsigned char *)str;
+	fake.f_bf.smb_size = fake.f_w = n - 1;
+	fake.f_close = NULL;
+	fake.f_open = NULL;
+	fake.f_read = NULL;
+	fake.f_write = NULL;
+	fake.f_seek = NULL;
+	fake.f_setinfo = fake.f_getinfo = NULL;
+	fake.f_type = "sm_vsnprintf:fake";
+	ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap);
+	*fake.f_p = 0;
+	return ret;
+}