Add forgotten boundary.c file.

1 files changed, 74 insertions, 0 deletions

diff --git a/boundary.c b/boundary.c
new file mode 100644
index 0000000..c0f1514
--- /dev/null
+++ b/boundary.c
@@ -0,0 +1,74 @@
+/*
+ * Boundary conditions internal API.
+ * Copyright 2019 Anton Khirnov <anton@khirnov.net>
+ *
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stddef.h>
+#include <stdlib.h>
+
+#include "common.h"
+#include "mg2d_boundary.h"
+
+struct MG2DBoundaryInternal {
+    double *val_base;
+};
+
+MG2DBoundary *mg2di_bc_alloc(size_t domain_size)
+{
+    MG2DBoundary *bnd;
+    size_t boundary_len_max;
+
+    if (domain_size > SIZE_MAX - 2 * (FD_STENCIL_MAX - 1))
+        return NULL;
+    boundary_len_max = domain_size + 2 * (FD_STENCIL_MAX - 1);
+    if (boundary_len_max > SIZE_MAX / (FD_STENCIL_MAX * sizeof(bnd->val)))
+        return NULL;
+
+    bnd = calloc(1, sizeof(*bnd));
+    if (!bnd)
+        return NULL;
+
+    bnd->priv = calloc(1, sizeof(*bnd->priv));
+    if (!bnd->priv) {
+        free(bnd);
+        return NULL;
+    }
+
+    bnd->priv->val_base = malloc(boundary_len_max * FD_STENCIL_MAX * sizeof(*bnd->val));
+    if (!bnd->priv->val_base)
+        goto fail;
+
+    bnd->val        = bnd->priv->val_base + FD_STENCIL_MAX - 1;
+    bnd->val_stride = boundary_len_max;
+
+    return bnd;
+fail:
+    mg2di_bc_free(&bnd);
+    return NULL;
+}
+
+void mg2di_bc_free(MG2DBoundary **pbnd)
+{
+    MG2DBoundary *bnd = *pbnd;
+
+    if (!bnd)
+        return;
+
+    free(bnd->priv->val_base);
+    free(bnd->priv);
+    free(bnd);
+    *pbnd = NULL;
+}