errno NOT being set to ERANGE after converting a string with a HUGE number to a double floating point number using strtod() in C

I am perplexed that errno is not being set to ERANGE after strtod() tries to convert a string with a huge real number to an double floating point number.

Here is what happens when I run my code:

Enter a real number: 5656565656565652622326352635236523652362356235
You entered 5656565656565652358969982685269310483757793280.000000.

Here is my code:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

int getDouble(char* prompt, double* doubleRealNumber);

int main(void)
{  
    double d;

    getDouble("Enter a real number: ", &d);
    printf("You entered %lf.\n", d);

    return 0;
}

int getDouble(char* prompt, double* doubleRealNumber)
{
    int const MAXBUFSIZE = 1024;
    char buf[MAXBUFSIZE]; // use 1KiB just to be sure
    int success; // flag for successful conversion
    
    do
    {
        printf("%s", prompt);
        fflush(stdout);
        
        if (!fgets(buf, MAXBUFSIZE, stdin))
        {
            // reading input failed:
            return 1;
        }
        
        // have some input, convert it to integer:
        char *endptr;
        
        errno = 0; // reset error number
    
        *doubleRealNumber = strtod(buf, &endptr);
        
        if (errno == ERANGE)
        {
            printf("Sorry, this number is too small or too large.\n");
            success = 0;
        }
        else if (endptr == buf)
        {
            // no character was read
            success = 0;
        }
        else if (*endptr && *endptr != '\n')
        {
            // *endptr is neither end of string nor newline,
            // so we didn't convert the *whole* input
            success = 0;
        }
        else
        {
            success = 1;
        }
    } while (!success); // repeat until we got a valid real number
    
    return 0;        
}