On 12/04/2014 08:59 AM, Jeff King wrote:
> On Wed, Dec 03, 2014 at 01:38:58PM -0800, Jonathan Nieder wrote:
>> The allocation of a variable-sized buffer is a small overhead that I
>> don't mind incurring on error. In the non-error case, the caller
>> doesn't actually have to free the buffer, and if they choose to, the
>> overhead incurred is that of free(NULL)'.
>
> I don't care at all about overhead. I care about extra work on the part
> of the caller to avoid a leak. It turns:
>
> if (some_func(fd, &err))
> return error("%s", err.msg);
>
> into:
>
> if (some_func(fd, &err)) {
> error("%s", err.buf);
> strbuf_release(&err);
> return -1;
> }
What if we go in the direction not of less infrastructure, but a little
bit more? Like
struct result {
int code;
struct strbuf msg;
};
int report_errors(struct result *result)
{
int code = result->code;
if (code) {
error(result->msg.buf);
}
result->code = 0;
strbuf_release(result->msg);
return code; /* or alternatively (code ? -1 : 0) */
}
int report_warnings(struct result *result)
{
...
}
int report_with_prefix(struct result *result, const char *fmt, ...)
{
...
}
Then a caller could look pretty much like before:
struct result result = RESULT_INIT;
if (some_func(fd, &result))
return report_errors(&result);
Other callers might not even bother to check the return value of the
function, relying instead on result.code via process_error():
char *ptr = some_func(fd, &result);
if (report_errors(&result))
return -1;
If the result code is considered superfluous, we could use naked strbufs
and use msg.len as the indicator that there was an error.
Michael
--
Michael Haggerty
mhag...@alum.mit.edu
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