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