Modify a char* string in C

Question

I have this:

char* original = \"html content\";

And want to insert a new

char* mycontent = \"newhtmlinsert\";

Answer 1

Attempting to modify the contents of a string literal results in undefined behavior.

You will need to allocate a target buffer (either as an auto variable or by using malloc) that's large enough to hold your final string plus a 0 terminator.

Also, you might want to use sprintf to make life a little easier, such as

sprintf(result, "%s before %s - %s - %s after %s", original, 
    tag, mycontent, original, tag);