Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have a function that have a char* as parameter to receive some informations from inside the function. (int foo(char* param1))
How can I be sure that this parameter have the enough allocated space to receive all the information I need to put in?
I can be sure if it is, or not, a valid pointer, but I haven’t found a way to be sure about the size/length allocated to the parameter.
I can’t change the function (can’t add another parameter with the size).
AFIAK, C++ does not have any facility to verify the amount of space allocated to a pointer. If the input points to a NULL-terminated array of chracters (i.e. a c-string), then you can use strlen(). Typically these kinds of functions in C and C++ must be well-documented as to what is expected from the parameters. The function is typically implemented assuming the the caller honors the documented contract.