diff --git a/util/getlines.c b/util/getlines.c
new file mode 100644
index 0000000..cf193eb
--- /dev/null
+++ b/util/getlines.c
@@ -0,0 +1,22 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "../text.h"
+#include "../util.h"
+
+void
+getlines(FILE *fp, struct linebuf *b)
+{
+	char *line = NULL;
+	size_t size = 0;
+
+	while(afgets(&line, &size, fp)) {
+		if(++b->nlines > b->capacity && !(b->lines = realloc(b->lines, (b->capacity+=512) * sizeof *b->lines)))
+			eprintf("realloc:");
+		if(!(b->lines[b->nlines-1] = malloc(strlen(line)+1)))
+			eprintf("malloc:");
+		strcpy(b->lines[b->nlines-1], line);
+	}
+	free(line);
+}