C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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sprintf, _snprintf
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─────Run-Time Library───────────────────────────────────────────────────────
 
     The sprintf function formats and stores a series of characters and
     values in <buffer>. Each <argument> (if any) is converted and
     output according to the corresponding format specification in the
     <format> argument. The format consists of ordinary characters and
     has the same form and function as the <format> argument for the
     printf function. A null character is appended to the end of the
     characters written, but is not counted in the return value.
     See: Format Specifiers
          Escape Sequences
 
     The _snprintf function differs from sprintf in that it stores no
     more than <count> characters to <buffer>.
 
     Return Value
 
     Both the sprintf and _snprintf functions return the number of
     characters stored in <buffer>, not counting the terminating null
     character. For _snprintf, if the number of bytes required to store
     the data exceeds <count>, then <count> bytes of data are stored in
     <buffer> and -1 is returned.
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