On 06/18/12 10:57, Dave Hart wrote:
So curiosity got the better of me. Here is code from glibc:
> /* Find the first occurrence of C in S. */
> char *
> strchr (s, c_in)
> const char *s;
> int c_in;
> {
> const unsigned char *char_ptr;
> const unsigned long int *longword_ptr;
> unsigned long int longword, magic_bits, charmask;
> unsigned reg_char c;
>
> c = (unsigned char) c_in;
>
> /* Handle the first few characters by reading one character at a time.
> Do this until CHAR_PTR is aligned on a longword boundary. */
> for (char_ptr = (const unsigned char *) s;
> ((unsigned long int) char_ptr & (sizeof (longword) - 1)) != 0;
> ++char_ptr)
> if (*char_ptr == c)
> return (void *) char_ptr;
Please notice the last line. The cast is being used to strip the const-ness
from "char_ptr". This is not really different from stripping it from the
argument.
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