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