Header File
stdio.h
Category
Memory and String Manipulation Routines
Prototype
int _vsnprintf(char* buffer, size_t nsize, const char* format, va_list param);
int _vsnwprintf(wchar_t* buffer, size_t nsize, const wchar_t* format, va_list param);
Description
Sends formatted output to a string of a maximum length specified by nsize. _vsnprintf and _vsnwprintf are Microsoft compatible with the _vsnprintf and _vsnprintfw functions, respectively.
If the number of bytes to output is:
If nsize is too small, then return value is -1, and only nsize characters are written, with no terminating ‘\0’ character.
Return Value
Number of bytes output or –1 if nsize is too small.
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