2 * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
10 * By using this file, you agree to the terms and conditions set
11 * forth in the LICENSE file which can be found at the top level of
12 * the sendmail distribution.
16 SM_RCSID("@(#)$Id: vsnprintf.c,v 1.23 2001/09/11 04:04:49 gshapiro Exp $")
22 ** SM_VSNPRINTF -- format data for "output" into a string
24 ** Assigned 'str' to a "fake" file pointer. This allows common
25 ** o/p formatting function sm_vprintf() to be used.
28 ** str -- location for output
29 ** n -- maximum size for o/p
30 ** fmt -- format directives
31 ** ap -- data unit vectors for use by 'fmt'
34 ** result from sm_io_vfprintf()
37 ** Limits the size ('n') to INT_MAX.
41 sm_vsnprintf(str, n, fmt, ap)
51 /* While snprintf(3) specifies size_t stdio uses an int internally */
55 /* Stdio internals do not deal correctly with zero length buffer */
61 fake.sm_magic = SmFileMagic;
62 fake.f_timeout = SM_TIME_FOREVER;
63 fake.f_timeoutstate = SM_TIME_BLOCK;
65 fake.f_flags = SMWR | SMSTR;
66 fake.f_bf.smb_base = fake.f_p = (unsigned char *)str;
67 fake.f_bf.smb_size = fake.f_w = n - 1;
73 fake.f_setinfo = fake.f_getinfo = NULL;
74 fake.f_type = "sm_vsnprintf:fake";
75 ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap);