Jonathan Nieder <jrnieder@xxxxxxxxx> writes:
> Hi,
>
> Junio C Hamano wrote:
>
>> I've been toying with an idea along this line.
>
> Heh. Just for fun, here's an uglier version:
Much nicer, though.
>
> struct wcb_data {
> int had_buffer;
> int using_buffer;
> };
> #define WITH_COMMIT_BUFFER_DATA_INIT { 0, 0 }
>
> extern void acquire_commit_buffer(struct commit *, struct wcb_data *);
> extern void done_with_commit_buffer(struct commit *, struct wcb_data *);
>
> /*
> * usage:
> * struct wcb_data buf = WITH_COMMIT_BUFFER_INIT;
> *
> * with_commit_buffer(commit, buf) {
> * ...
> * }
> */
> #define with_commit_buffer(commit, i) \
> for (acquire_commit_buffer(commit, &i); \
> i.using_buffer; \
> done_with_commit_buffer(commit, &i))
>
> void acquire_commit_buffer(struct commit *commit, struct wcb_data *i)
> {
> enum object_type type;
> unsigned long size;
>
> assert(!i->using_buffer);
> i->using_buffer = 1;
> i->had_buffer = !!commit->buffer;
>
> if (i->had_buffer)
> return;
> commit->buffer = read_sha1_file(commit->object.sha1, &type, &size);
> if (!commit->buffer)
> die("unable to read commit %s", sha1_to_hex(commit->object.sha1));
> }
>
> void done_with_commit_buffer(struct commit *commit, struct wcb_data *i)
> {
> assert(i->using_buffer);
> i->using_buffer = 0;
>
> if (!i->had_buffer) {
> free(commit->buffer);
> commit->buffer = NULL;
> }
> }
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