On Mon, May 5, 2008 at 7:11 PM, ed <[EMAIL PROTECTED]> wrote: > > On Mon, 5 May 2008 18:04:15 -0300 > "César Leonardo Blum Silveira" <[EMAIL PROTECTED]> wrote: > > > Hello, > > > > What is the correct way to fill the dsize field in apr_datum_t? I am > > not sure whether I should do it like this > > > > apr_datum_t d; > > > > d.dptr = "hello, world"; > > d.dsize = strlen(d.dptr); > > > > or like this > > > > apr_datum_t d; > > > > d.dptr = "hello, world"; > > d.dsize = strlen(d.dptr) + 1; > > > > Could anyone tell me whether the +1 in the second case is really > > necessary? > > > > Thanks, > > "hello" = > > +---+---+---+---+---+---+ > | h | e | l | l | o | 0 | > +---+---+---+---+---+---+ > > That 0 at the end is the null terminator. It is automatically included > in the string literal "hello, world". Although you did not explicitly > put it there it will still be required during string operations > otherwise you will enter overflow. > > If on the other hand you're just using it as a raw memory (for image > data etc) then it's not required, but you're unlikely to use strncpy on > this sort of data. > > strlen will return 5 when you give it the string "hello", but if you > want to put "hello" into some memory then you better have 6 bytes of > memory ready. >
Thanks. The thing is that I didn't know whether DBMs "expected" strings or could store any kind of data. Now it makes more sense to add the +1 after strlen > > -- > The DS3 to the Xbox is toast because of All your base are belong to us. > Earthlink is being bought by AOL. > :: http://www.s5h.net/ :: http://www.s5h.net/gpg.html > -- César L. B. Silveira
