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

The string.h function strcat will concatenate two strings, however it will fail when there is not enough space for the new string. My solution is to make your own version of strcat:

char* myStrCat(const char* str1, const char* str2)
{
    char* result;
    char* itr1;
    char* itr2;

    if (str1 == NULL || str2 == NULL)
    {
        return NULL;
    }

    result = (char*)malloc(sizeof(char) * (strlen(str1) + strlen(str2) + 1));   

    itr1 = result;
    itr2 = (char*)str1;

    while (*itr2 != '\0')
    {
        *itr1 = *itr2;
        itr1++;
        itr2++;
    }

    itr2 = (char*)str2;

    while (*itr2 != '\0')
    {
        *itr1 = *itr2;
        itr1++;
        itr2++;
    }

    *itr1 = '\0';

    return result;
}

This is kinda ugly, but it gets the job done :)