Difficulty implementing djb2 hash function

Asked Feb 09 '17 at 02:33

Active Feb 09 '17 at 02:33

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I'm trying to create a function for a hash table, but when I run my code I get a warning saying assignment makes integer from pointer without a cast. My code is:

//from header file
//word_t is char*
typedef word_t* vc_ht_key;
typedef void *ht_key;

//in file
size_t hash(ht_key k) {
  unsigned long val = 5381;
  int c;
  while ((c = (*(vc_ht_key)k)++)) {
    val = ((val << 5) + val) + c;
  }
  return (size_t)val;
}

Sorry in advance for any missing information. I was given a generic hash table to work with making it impossible to post all of it here. I was hoping someone could explaining the type casting issue. e.g simply adding an (int) to the while line.

asked Feb 09 '17 at 02:33

Kayanda

`(*(vc_ht_key)k)` is a `char*`. Is it supposed to be a `char*` or just a `char`? – user253751 Feb 09 '17 at 02:35
here is a link to the source code I'm trying to use – Kayanda Feb 09 '17 at 02:40
[link] (http://stackoverflow.com/questions/2571683/djb2-hash-function) – Kayanda Feb 09 '17 at 02:41
Well the source code in the link and the source code in your question are different so clearly that is not the source code you're trying to use. – user253751 Feb 09 '17 at 02:42
I'm pretty sure their the same function once I type cast k to be a char*, at least behavior wise. – Kayanda Feb 09 '17 at 02:47
But you aren't typecasting k to be a char*. – user253751 Feb 09 '17 at 03:17
Then what am I typecasting k to be – Kayanda Feb 09 '17 at 20:44
`char**`, because `word_t` is `char*`, so `word_t*` is `char**` – user253751 Feb 09 '17 at 21:30

Difficulty implementing djb2 hash function

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