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

Assuming that char* original is composed by two parts, one starts at 0 while the other (html content after) starts at x you can use strcat and memcpy:

int length = strlen(original)+strlen(newcontent)+1;
char *neworiginal = malloc(sizeof(char)*length);
memset(neworiginal, 0, length);
memcpy(neworiginal,original,x*sizeof(char));
strcat(neworiginal,newcontent);
strcat(neworiginal,original+x);