Splitting into separate files.

abuf.c

@@ -0,0 +1,77 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "abuf.h"
+
+
+void
+abuf_init(abuf *buf)
+{
+	assert(buf != NULL);
+
+	buf->b    = NULL;
+	buf->size = buf->cap = 0;
+}
+
+
+void
+ab_appendch(abuf *buf, char c)
+{
+	ab_append(buf, &c, 1);
+}
+
+
+void
+ab_append(abuf *buf, const char *s, size_t len)
+{
+	char	*nc = buf->b;
+	size_t	 sz = buf->size + len;
+
+	if (sz >= buf->cap) {
+		while (sz > buf->cap) {
+			if (buf->cap == 0) {
+				buf->cap = 1;
+			} else {
+				buf->cap *= 2;
+			}
+		}
+		nc = realloc(nc, buf->cap);
+		assert(nc != NULL);
+	}
+
+	memcpy(&nc[buf->size], s, len);
+	buf->b = nc;
+	buf->size += len;
+}
+
+
+void
+ab_prependch(abuf *buf, const char c)
+{
+	ab_prepend(buf, &c, 1);
+}
+
+
+void
+ab_prepend(abuf *buf, const char *s, const size_t len)
+{
+	char	*nc = realloc(buf->b, buf->size + len);
+	assert(nc != NULL);
+
+	memmove(nc + len, nc, buf->size);
+	memcpy(nc, s, len);
+
+	buf->b = nc;
+	buf->size += len;
+}
+
+
+void
+ab_free(abuf *buf)
+{
+	free(buf->b);
+	buf->b    = NULL;
+	buf->size = 0;
+	buf->cap  = 0;
+}