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34c17b840d
We're including a couple of standard headers like <stdint.h> in a bunch
of locations, which makes it hard for a project to plug in their own
logic for making required functionality available. For us this is for
example via "compat/posix.h", which already includes all of the system
headers relevant to us.
Introduce a new "reftable-system.h" header that allows projects to
provide their own headers. This new header is supposed to contain all
the project-specific bits to provide the POSIX-like environment, and some
additional supporting code. With this change, we thus have the following
split in our system-specific code:
- "reftable/reftable-system.h" is the project-specific header that
provides a POSIX-like environment. Every project is expected to
provide their own implementation.
- "reftable/system.h" contains the project-independent definition of
the interfaces that a project needs to implement. This file should
not be touched by a project.
- "reftable/system.c" contains the project-specific implementation of
the interfaces defined in "system.h". Again, every project is
expected to provide their own implementation.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/*
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* Copyright 2020 Google LLC
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*
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* Use of this source code is governed by a BSD-style
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* license that can be found in the LICENSE file or at
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* https://developers.google.com/open-source/licenses/bsd
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*/
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#ifndef REFTABLE_ITERATOR_H
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#define REFTABLE_ITERATOR_H
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#include "reftable-system.h"
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#include "reftable-record.h"
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struct reftable_iterator_vtable;
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/* iterator is the generic interface for walking over data stored in a
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* reftable.
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*/
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struct reftable_iterator {
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struct reftable_iterator_vtable *ops;
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void *iter_arg;
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};
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/*
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* Position the iterator at the ref record with given name such that the next
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* call to `next_ref()` would yield the record.
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*/
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int reftable_iterator_seek_ref(struct reftable_iterator *it,
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const char *name);
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/* reads the next reftable_ref_record. Returns < 0 for error, 0 for OK and > 0:
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* end of iteration.
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*/
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int reftable_iterator_next_ref(struct reftable_iterator *it,
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struct reftable_ref_record *ref);
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/*
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* Position the iterator at the log record with given name and update index
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* such that the next call to `next_log()` would yield the record.
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*/
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int reftable_iterator_seek_log_at(struct reftable_iterator *it,
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const char *name, uint64_t update_index);
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/*
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* Position the iterator at the newest log record with given name such that the
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* next call to `next_log()` would yield the record.
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*/
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int reftable_iterator_seek_log(struct reftable_iterator *it,
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const char *name);
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/* reads the next reftable_log_record. Returns < 0 for error, 0 for OK and > 0:
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* end of iteration.
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*/
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int reftable_iterator_next_log(struct reftable_iterator *it,
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struct reftable_log_record *log);
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/* releases resources associated with an iterator. */
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void reftable_iterator_destroy(struct reftable_iterator *it);
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#endif
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