Re: More questions on realloc - Thanks

Jordan Abel <jmabel@xxxxxxxxxx> wrote:
> On 2005-11-29, S.Tobias <siXtY@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>> James S. Singleton <pt109@xxxxxxxxxx> wrote:
>>> b) Implementing realloc(ptr, size) using malloc(), memcpy() and free()
>>> alone, without knowing the size of the memory region pointed to by ptr, is
>>> just not possible.
>>
>> True, in standard C it's not possible.
>>
>> But note that `malloc' and `free' are redundant and can be implemented
>> in terms of `realloc'.
>
> free() can't, unless a size request of 0 does not cause an allocation
> [which is not guaranteed.]

#include <stdlib.h>
void my_free(void *p) { while(p = realloc(p,0)) ; }
;-)

Yes, you're right, I was wrong. `realloc(p,0)' is *not* equivalent
to `free(p)' (for non-null `p'). I knew it once, but forgot.
Thank you!

--
Stan Tobias
mailx `echo siXtY@xxxxxxxxxxxxxxxxxxxxxxxxxx | sed s/[[:upper:]]//g`
.

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