Jim Stapleton wrote:
char *superstring = (char*)malloc(sizeof(int) * 2 + sizeof(char) * string_size);
string lenght: (int)*(superstring - sizeof(int))
string allocated: (int)*(superstring - sizeof(int) * 2)
Suggestion:
typedef struct {
size_t allocated, length;
char contents[1];
} SuperString;
SuperString *superstring =
malloc(offsetof(SuperString,contents) + string_size);
Incidentally, C and C++ both guarantee sizeof(char)==1, and in C it's
considered good practice to omit explicit casts from (void*) in this
situation, since the redundancy can be a source of error. (But in C++ you
can't omit them.)
-- Ben
