1 files changed, 83 insertions, 0 deletions
diff --git a/src/text-buffer.c b/src/text-buffer.c
new file mode 100644
index 0000000..caa1c3e
--- /dev/null
+++ b/src/text-buffer.c
@@ -0,0 +1,83 @@
+/* parc
+ * Copyright (C) 2025 Ekaitz Zarraga <ekaitz@elenq.tech>
+ *
+ * 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 <assert.h>
+#include <stdlib.h>
+#include "text-buffer.h"
+
+void
+text_buffer_init (text_buffer *tb)
+{
+  tb->used = 0;
+  tb->size = 0;
+  tb->contents = NULL;
+}
+
+void
+text_buffer_resize (text_buffer *tb, size_t size)
+{
+  tb->size = size;
+  tb->contents = realloc (tb->contents, sizeof (*tb->contents) * size);
+}
+
+void
+text_buffer_append (text_buffer *tb, char c)
+{
+  size_t base_size = 1024;
+  if (tb->size == 0)
+    {
+      tb->contents = malloc (sizeof (*tb->contents) * base_size);
+      tb->size = base_size;
+    }
+  else if (tb->size == tb->used)
+    text_buffer_resize (tb, tb->size * 2);
+  tb->contents[tb->used++] = c;
+}
+
+char
+text_buffer_index (text_buffer *tb, size_t pos)
+{
+  assert (pos < tb->used);
+  return tb->contents[pos];
+}
+
+void
+text_buffer_empty (text_buffer *tb)
+{
+  free (tb->contents);
+  text_buffer_init (tb);
+}
+
+void
+text_buffer_fill (text_buffer *tb, char *fill, size_t size)
+{
+  size_t i;
+  tb->used = size;
+  tb->size = size;
+  free (tb->contents);
+  tb->contents = malloc (sizeof (*tb->contents) * size);
+  for (i=0; i<size; i++)
+    {
+      tb->contents[i] = fill[i];
+    }
+}
+
+void
+text_buffer_free (text_buffer *tb)
+{
+  free (tb->contents);
+  text_buffer_init (tb);
+}