Implementing Variadic Functions

#include <stdio.h>
#include <stdarg.h>

size_t vmputs(size_t count, va_list arg_list);

// mputs ("multiple" puts)
// like puts, but for multiple strings.
size_t mputs(size_t count, ...) {
    va_list arg_list;
    va_start(arg_list, count);
    size_t rc = vmputs(count, arg_list);
    // I could implement this directly here
    // but then I would be duplicating the code from vmputs
    va_end(arg_list);
    return rc;
}

// as is convention
// for every variadic function,
// I have a second one prefixed with a 'v' that takes a va_args
size_t vmputs(size_t count, va_list arg_list) {
    size_t s = 0;
    for(size_t i = 0; i < count; ++i) {
        char* arg = va_arg(arg_list, char*);
        s += puts(arg);
    }
    return s;
}

// dbg_printf is like printf, but prepends "debug message: "
// The "v" convention is found in most std functions
// including the *printf family
// so I can do things like this
size_t dbg_printf(char* fmt, ...) {
    size_t s = 0;
    s += printf("debug message: ");

    // how do I pass all of my ... to printf??

    // use vprintf!
    va_list arg_list;
    va_start(arg_list, fmt);
    s += vprintf(fmt, arg_list);
    va_end(arg_list);

    return s;
}

int main() {
    mputs(3, "hello", "world", ".");

    dbg_printf("%d != %d\n", 3, 5);

    return 0;
}

// Output:
// hello
// world
// .
// debug message: 3 != 5