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89f7d841ab
It seems like initializing something to an empty array using `{}` is a GCCism,
so just stuff a 0 within the braces to accomplish the same thing.
284 lines
6.6 KiB
C
284 lines
6.6 KiB
C
/*
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* Copyright © 2020 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include <glib.h>
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G_BEGIN_DECLS
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#ifndef GDK_ARRAY_TYPE_NAME
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#define GDK_ARRAY_TYPE_NAME GdkArray
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#endif
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#ifndef GDK_ARRAY_NAME
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#define GDK_ARRAY_NAME gdk_array
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#endif
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#ifndef GDK_ARRAY_ELEMENT_TYPE
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#define GDK_ARRAY_ELEMENT_TYPE gpointer
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#endif
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#ifdef GDK_ARRAY_PREALLOC
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#if GDK_ARRAY_PREALLOC == 0
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#undef GDK_ARRAY_PREALLOC
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#endif
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#endif
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#ifdef GDK_ARRAY_NULL_TERMINATED
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#define GDK_ARRAY_REAL_SIZE(_size) ((_size) + 1)
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#else
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#define GDK_ARRAY_REAL_SIZE(_size) (_size)
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#endif
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/* make this readable */
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#define _T_ GDK_ARRAY_ELEMENT_TYPE
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#define GdkArray GDK_ARRAY_TYPE_NAME
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#define gdk_array_paste_more(GDK_ARRAY_NAME, func_name) GDK_ARRAY_NAME ## _ ## func_name
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#define gdk_array_paste(GDK_ARRAY_NAME, func_name) gdk_array_paste_more (GDK_ARRAY_NAME, func_name)
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#define gdk_array(func_name) gdk_array_paste (GDK_ARRAY_NAME, func_name)
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typedef struct GdkArray GdkArray;
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struct GdkArray
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{
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_T_ *start;
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_T_ *end;
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_T_ *end_allocation;
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#ifdef GDK_ARRAY_PREALLOC
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_T_ preallocated[GDK_ARRAY_REAL_SIZE(GDK_ARRAY_PREALLOC)];
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#endif
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};
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/* no G_GNUC_UNUSED here, if you don't use an array type, remove it. */
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static inline void
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gdk_array(init) (GdkArray *self)
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{
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#ifdef GDK_ARRAY_PREALLOC
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self->start = self->preallocated;
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self->end = self->start;
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self->end_allocation = self->start + GDK_ARRAY_PREALLOC;
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#ifdef GDK_ARRAY_NULL_TERMINATED
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*self->start = *(_T_[1]) { 0 };
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#endif
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#else
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self->start = NULL;
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self->end = NULL;
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self->end_allocation = NULL;
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#endif
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}
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static inline void
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gdk_array(free_elements) (_T_ *start,
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_T_ *end)
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{
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#ifdef GDK_ARRAY_FREE_FUNC
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_T_ *e;
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for (e = start; e < end; e++)
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#ifdef GDK_ARRAY_BY_VALUE
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GDK_ARRAY_FREE_FUNC (e);
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#else
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GDK_ARRAY_FREE_FUNC (*e);
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#endif
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#endif
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}
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/* no G_GNUC_UNUSED here */
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static inline void
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gdk_array(clear) (GdkArray *self)
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{
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gdk_array(free_elements) (self->start, self->end);
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#ifdef GDK_ARRAY_PREALLOC
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if (self->start != self->preallocated)
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#endif
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g_free (self->start);
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gdk_array(init) (self);
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}
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G_GNUC_UNUSED static inline _T_ *
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gdk_array(get_data) (const GdkArray *self)
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{
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return self->start;
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}
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G_GNUC_UNUSED static inline _T_ *
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gdk_array(index) (const GdkArray *self,
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gsize pos)
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{
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return self->start + pos;
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}
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G_GNUC_UNUSED static inline gsize
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gdk_array(get_capacity) (const GdkArray *self)
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{
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return self->end_allocation - self->start;
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}
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G_GNUC_UNUSED static inline gsize
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gdk_array(get_size) (const GdkArray *self)
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{
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return self->end - self->start;
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}
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G_GNUC_UNUSED static inline gboolean
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gdk_array(is_empty) (const GdkArray *self)
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{
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return self->end == self->start;
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}
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G_GNUC_UNUSED static void
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gdk_array(reserve) (GdkArray *self,
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gsize n)
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{
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gsize new_size, size;
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if (n <= gdk_array(get_capacity) (self))
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return;
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size = gdk_array(get_size) (self);
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new_size = 1 << g_bit_storage (MAX (GDK_ARRAY_REAL_SIZE (n), 16) - 1);
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#ifdef GDK_ARRAY_PREALLOC
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if (self->start == self->preallocated)
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{
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self->start = g_new (_T_, new_size);
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memcpy (self->start, self->preallocated, sizeof (_T_) * GDK_ARRAY_REAL_SIZE (size));
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}
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else
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#endif
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#ifdef GDK_ARRAY_NULL_TERMINATED
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if (self->start == NULL)
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{
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self->start = g_new (_T_, new_size);
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*self->start = *(_T_[1]) { 0 };
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}
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else
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#endif
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self->start = g_renew (_T_, self->start, new_size);
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self->end = self->start + size;
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self->end_allocation = self->start + new_size;
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#ifdef GDK_ARRAY_NULL_TERMINATED
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self->end_allocation--;
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#endif
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}
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G_GNUC_UNUSED static void
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gdk_array(splice) (GdkArray *self,
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gsize pos,
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gsize removed,
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_T_ *additions,
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gsize added)
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{
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gsize size;
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gsize remaining;
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size = gdk_array(get_size) (self);
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g_assert (pos + removed <= size);
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remaining = size - pos - removed;
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gdk_array(free_elements) (gdk_array(index) (self, pos),
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gdk_array(index) (self, pos + removed));
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gdk_array(reserve) (self, size - removed + added);
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if (GDK_ARRAY_REAL_SIZE (remaining) && removed != added)
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memmove (gdk_array(index) (self, pos + added),
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gdk_array(index) (self, pos + removed),
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GDK_ARRAY_REAL_SIZE (remaining) * sizeof (_T_));
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if (added)
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{
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if (additions)
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memcpy (gdk_array(index) (self, pos),
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additions,
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added * sizeof (_T_));
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else
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memset (gdk_array(index) (self, pos), 0, added * sizeof (_T_));
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}
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/* might overflow, but does the right thing */
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self->end += added - removed;
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}
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G_GNUC_UNUSED static void
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gdk_array(set_size) (GdkArray *self,
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gsize new_size)
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{
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gsize old_size = gdk_array(get_size) (self);
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if (new_size > old_size)
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gdk_array(splice) (self, old_size, 0, NULL, new_size - old_size);
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else
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gdk_array(splice) (self, new_size, old_size - new_size, NULL, 0);
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}
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G_GNUC_UNUSED static void
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gdk_array(append) (GdkArray *self,
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#ifdef GDK_ARRAY_BY_VALUE
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_T_ *value)
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#else
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_T_ value)
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#endif
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{
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gdk_array(splice) (self,
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gdk_array(get_size) (self),
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0,
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#ifdef GDK_ARRAY_BY_VALUE
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value,
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#else
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&value,
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#endif
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1);
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}
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#ifdef GDK_ARRAY_BY_VALUE
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G_GNUC_UNUSED static _T_ *
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gdk_array(get) (const GdkArray *self,
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gsize pos)
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{
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return gdk_array(index) (self, pos);
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}
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#else
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G_GNUC_UNUSED static _T_
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gdk_array(get) (const GdkArray *self,
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gsize pos)
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{
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return *gdk_array(index) (self, pos);
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}
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#endif
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#ifndef GDK_ARRAY_NO_UNDEF
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#undef _T_
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#undef GdkArray
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#undef gdk_array_paste_more
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#undef gdk_array_paste
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#undef gdk_array
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#undef GDK_ARRAY_REAL_SIZE
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#undef GDK_ARRAY_BY_VALUE
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#undef GDK_ARRAY_ELEMENT_TYPE
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#undef GDK_ARRAY_FREE_FUNC
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#undef GDK_ARRAY_NAME
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#undef GDK_ARRAY_NULL_TERMINATED
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#undef GDK_ARRAY_PREALLOC
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#undef GDK_ARRAY_TYPE_NAME
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#endif
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