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#include <stdarg.h> #include <stdio.h> int vprintf(char *format, va_list arg_ptr); int vfprintf(FILE *stream, const char *format, va_list arg_ptr); int vsprintf(char *buf, const char *format, va_list arg_ptr); int vsnprintf(char * restrict buf, size_t num, const char * restrict format, va_list arg_ptr);
The functions vprintf( ), vfprintf( ), vsprintf( ), and vsnprint( ) are functionally equivalent to printf( ), fprintf( ), sprintf( ), and snprintf( ), respectively, except that the argument list has been replaced by a pointer to a list of arguments. This pointer must be of type va_list, which is defined in the header <stdarg.h>.
In C99, buf and format are qualified by restrict. The vsnprintf( ) function was added by C99.
Related functions are vscanf( ), vfscanf( ), vsscanf( ), va_arg( ), va_start( ), and va_end( ).
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