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mpv/mpvcore/mp_talloc.h
wm4 d2d0bc31bf mp_talloc: simplify a bit
Implement MP_GROW_ARRAY using MP_TARRAY_GROW. MP_GROW_ARRAY is basically
the earlier version of MP_TARRAY_GROW, and had different semantics. When
I added MP_TARRAY_GROW, I didn't dare to change it, but I think all code
that relied on the exact semantics of MP_GROW_ARRAY is gone now, or the
difference doesn't matter anyway. The semantic change is that now
(n+1)*2 elements are preallocated instead of n*2.

Also, implement MP_TARRAY_GROW using MP_RESIZE_ARRAY, which saves 1 line
of code.

In future, these macros should be part of TA.
2013-10-19 21:43:08 +02:00

60 lines
2.2 KiB
C

/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPV_TALLOC_H
#define MPV_TALLOC_H
#include "talloc.h"
#include "compat/compiler.h"
#define MP_TALLOC_ELEMS(p) (talloc_get_size(p) / sizeof((p)[0]))
#define MP_RESIZE_ARRAY(ctx, p, count) do { \
(p) = talloc_realloc_size((ctx), p, (count) * sizeof((p)[0])); } while (0)
#define MP_TARRAY_GROW(ctx, p, nextidx) \
do { \
size_t nextidx_ = (nextidx); \
if (nextidx_ >= MP_TALLOC_ELEMS(p)) \
MP_RESIZE_ARRAY(ctx, p, (nextidx_ + 1) * 2);\
} while (0)
#define MP_GROW_ARRAY(p, nextidx) MP_TARRAY_GROW(NULL, p, nextidx)
#define MP_TARRAY_APPEND(ctx, p, idxvar, ...) \
do { \
MP_TARRAY_GROW(ctx, p, idxvar); \
(p)[(idxvar)] = (MP_EXPAND_ARGS(__VA_ARGS__));\
(idxvar)++; \
} while (0)
// Doesn't actually free any memory, or do any other talloc calls.
#define MP_TARRAY_REMOVE_AT(p, idxvar, at) \
do { \
size_t at_ = (at); \
assert(at_ <= (idxvar)); \
memmove((p) + at_, (p) + at_ + 1, \
((idxvar) - at_ - 1) * sizeof((p)[0])); \
(idxvar)--; \
} while (0)
#define talloc_struct(ctx, type, ...) \
talloc_memdup(ctx, &(type) MP_EXPAND_ARGS(__VA_ARGS__), sizeof(type))
#endif