Function vprintf

stdlib/c/stdio.c:94–170

}

int vprintf(const char *format, va_list args) {
    int count = 0;

    while (*format) {
        if (*format == '%') {
            format++;
            switch (*format) {
                case 'd': {
                    int i = va_arg(args, int);
                    char s[12]; 
                    itoa(i, s);
                    puts(s);
                    count += strlen(s);
                    break;
                }
                case 's': {
                    char *s = va_arg(args, char *);
                    puts(s);
                    count += strlen(s);
                    break;
                }
                case 'c': {
                    char c = (char)va_arg(args, int); 
                    putchar(c);
                    count++;
                    break;
                }
                case 'p': {
                    // Use uintptr_t for pointer conversion
                    uintptr_t p = va_arg(args, uintptr_t);
                    char s[21];
                    s[0] = '0';
                    s[1] = 'x';
                    // Use a loop and bit shifting for hex conversion
                    for (int i = sizeof(p) * 2 - 1; i >= 0; --i) {
                        int digit = (p >> (i * 4)) & 0xF;
                        s[2 + sizeof(p) * 2 - 1 - i] = (digit < 10) ? TO_DIGIT(digit) : (digit - 10 + 'a');
                    }
                    s[sizeof(s) - 1] = '\0';
                    puts(s);
                    count += strlen(s);
                    break;
                }
case 'l': {
    format++;
    if (*format == 'l' && *(format + 1) == 'd') { 
        // Only increment format once here
        format++; 
        long long int i = va_arg(args, long long int);
        char s[21];
        llitoa(i, s);
        puts(s);
        count += strlen(s);
    } else {
        // Handle invalid specifier
        putchar('%');
        putchar('l');
        putchar(*format);