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/*-
* Copyright (c) 2014-2017 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_vsnprintf_len_incr --
* POSIX vsnprintf convenience function, incrementing the returned size.
*/
int
__wt_vsnprintf_len_incr(
char *buf, size_t size, size_t *retsizep, const char *fmt, va_list ap)
{
int len;
/*
* WiredTiger calls with length 0 to get the needed buffer size. Call
* the count only version in this case, _vsnprintf_s will invoke the
* invalid parameter handler if count is less than or equal to zero.
*/
if (size == 0) {
*retsizep += (size_t)_vscprintf(fmt, ap);
return (0);
}
/*
* Additionally, the invalid parameter handler is invoked if buffer or
* format is a NULL pointer.
*/
if (buf == NULL || fmt == NULL)
return (EINVAL);
/*
* If the storage required to store the data and a terminating null
* exceeds size, the invalid parameter handler is invoked, unless
* count is _TRUNCATE, in which case as much of the string as will
* fit in the buffer is written and -1 returned.
*/
if ((len = _vsnprintf_s(buf, size, _TRUNCATE, fmt, ap)) >= 0) {
*retsizep += (size_t)len;
return (0);
}
/* Return the buffer size required. */
if (len == -1)
*retsizep += (size_t)_vscprintf(fmt, ap);
return (0);
}
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