Question

I declared the following char* and tried to pass it to a function that requires a char * as the 3rd argument:

char *echo;
prompt = ssh_userauth_kbdint_getprompt(primarySession, 0, echo);

However, I get the error:

error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]

I also tried declaration as char echo; and the passed argument as &echo. But I don’t really need the value that this function changes in echo. So I wanted to pass NULL, but I guess I expected that to be a const. I also tried this trick:

char echo;
prompt = ssh_userauth_kbdint_getprompt(primarySession, 0, (char *)(&echo));

Still no success. Suggestions?

Answer 1

Look at the declaration of that function:

const char *
ssh_userauth_kbdint_getprompt (ssh_session session, unsigned int i, char *echo)

Thus it is prompt that needs to be a const char * instead of a char *.