Safe string formatting interface that wraps the vsnprintf(3) call.
It differs primarily in that pmsprintf guarantees that the output
buffer str will be null-terminated even when the provided buffer size
is insufficient to contain the formatted string. In this case a
null-terminated truncated string will be returned in str.
In the case of a failure in the underlying vsnprintf interface, a
null-terminated empty string will be returned in str, and the return
value will be zero.
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Performance Co-Pilot PCP PMSPRINTF(3)