--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/compat/getline.c	Thu Sep 21 09:45:59 2017 +0200
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2016 Guido Berhoerster <guido+pwm@berhoerster.name>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <errno.h>
+
+#include "getline.h"
+
+#define	MIN(x, y)	(((x) < (y)) ? (x) : (y))
+
+ssize_t
+getdelim(char **linep, size_t *sizep, int delim, FILE *fp)
+{
+	ssize_t	len;
+	char	*line = *linep;
+	size_t	size = *sizep;
+	size_t	pos = 0;
+	char	*line_new;
+	int	c;
+
+	if (*linep == NULL) {
+		size = 0;
+	}
+
+	flockfile(fp);
+
+	for (;;) {
+		if (size - pos < 2) {
+			size = MIN((size_t)SSIZE_MAX + 1,
+			    (size < BUFSIZ) ? BUFSIZ : size * 1.5);
+			if (size - pos < 2) {
+				len = -1;
+				errno = EOVERFLOW;
+				break;
+			}
+			line_new = realloc(line, size);
+			if (line_new == NULL) {
+				len = -1;
+				break;
+			}
+			*linep = line = line_new;
+			*sizep = size;
+		}
+		c = fgetc(fp);
+		if (c == EOF) {
+			len = -1;
+			break;
+		}
+		line[pos] = c;
+		pos++;
+		len = pos;
+		if (c == delim) {
+			break;
+		}
+	}
+
+	if (*linep != NULL) {
+		(*linep)[pos] = '\0';
+	}
+
+	funlockfile(fp);
+
+	return (len);
+}
+
+ssize_t
+getline(char **linep, size_t *sizep, FILE *fp)
+{
+	return (getdelim(linep, sizep, '\n', fp));
+}