Type checking (CRT)

The compiler performs limited type checking on functions that can take a variable number of arguments, as follows:

Function call	Type-checked arguments
_cprintf_s, _cscanf_s, printf_s, scanf_s	First argument (format string)
fprintf_s, fscanf_s, sprintf_s, sscanf_s	First two arguments (file or buffer and format string)
_snprintf_s	First three arguments (file or buffer, count, and format string)
_open	First two arguments (path and _open flag)
_sopen_s	First three arguments (path, _open flag, and sharing mode)
_execl, _execle, _execlp, _execlpe	First two arguments (path and first argument pointer)
_spawnl, _spawnle, _spawnlp, _spawnlpe	First three arguments (mode flag, path, and first argument pointer)

The compiler performs the same limited type checking on the wide-character counterparts of these functions.

See also

C runtime (CRT) and C++ Standard Library (STL) .lib files