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+/* Serd, an RDF serialisation library.
+ * Copyright 2011 David Robillard <d@drobilla.net>
+ *
+ * Serd is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Serd 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 Lesser General Public
+ * License for details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SERD_INTERNAL_H
+#define SERD_INTERNAL_H
+
+#include <assert.h>
+
+#include "serd/serd.h"
+
+/** A dynamic stack in memory. */
+typedef struct {
+ uint8_t* buf; ///< Stack memory
+ size_t buf_size; ///< Allocated size of buf (>= size)
+ size_t size; ///< Conceptual size of stack in buf
+} SerdStack;
+
+/** An offset to start the stack at. Note 0 is reserved for NULL. */
+#define SERD_STACK_BOTTOM sizeof(void*)
+
+static inline SerdStack
+serd_stack_new(size_t size)
+{
+ SerdStack stack;
+ stack.buf = malloc(size);
+ stack.buf_size = size;
+ stack.size = SERD_STACK_BOTTOM;
+ return stack;
+}
+
+static inline bool
+serd_stack_is_empty(SerdStack* stack)
+{
+ return stack->size <= SERD_STACK_BOTTOM;
+}
+
+static inline void
+serd_stack_free(SerdStack* stack)
+{
+ free(stack->buf);
+ stack->buf = NULL;
+ stack->buf_size = 0;
+ stack->size = 0;
+}
+
+static inline uint8_t*
+serd_stack_push(SerdStack* stack, size_t n_bytes)
+{
+ const size_t new_size = stack->size + n_bytes;
+ if (stack->buf_size < new_size) {
+ stack->buf_size *= 2;
+ stack->buf = realloc(stack->buf, stack->buf_size);
+ }
+ uint8_t* const ret = (stack->buf + stack->size);
+ stack->size = new_size;
+ return ret;
+}
+
+static inline void
+serd_stack_pop(SerdStack* stack, size_t n_bytes)
+{
+ assert(stack->size >= n_bytes);
+ stack->size -= n_bytes;
+}
+
+/** Return true if @a c lies within [min...max] (inclusive) */
+static inline bool
+in_range(const uint8_t c, const uint8_t min, const uint8_t max)
+{
+ return (c >= min && c <= max);
+}
+
+/** RFC2234: ALPHA := %x41-5A / %x61-7A ; A-Z / a-z */
+static inline bool
+is_alpha(const uint8_t c)
+{
+ return in_range(c, 'A', 'Z') || in_range(c, 'a', 'z');
+}
+
+/** RFC2234: DIGIT ::= %x30-39 ; 0-9 */
+static inline bool
+is_digit(const uint8_t c)
+{
+ return in_range(c, '0', '9');
+}
+
+#endif // SERD_INTERNAL_H