Add implementation of getline.

Add getline for the benefit of platforms that don't have it.  Sourced
from NetBSD (OpenBSD's implementation is a little too chummy with the
internals of FILE).

configure.ac

@@ -1780,6 +1780,7 @@ AC_CHECK_FUNCS([ \
 	getaddrinfo \
 	getcwd \
 	getgrouplist \
+	getline \
 	getnameinfo \
 	getopt \
 	getpagesize \

openbsd-compat/Makefile.in

@@ -68,6 +68,7 @@ COMPAT=	arc4random.o \
 	bsd-cygwin_util.o \
 	bsd-err.o \
 	bsd-flock.o \
+	bsd-getline.o \
 	bsd-getpagesize.o \
 	bsd-getpeereid.o \
 	bsd-malloc.o \

openbsd-compat/bsd-getline.c

@@ -0,0 +1,113 @@
+/*	$NetBSD: getline.c,v 1.1.1.6 2015/01/02 20:34:27 christos Exp $	*/
+
+/*	NetBSD: getline.c,v 1.2 2014/09/16 17:23:50 christos Exp 	*/
+
+/*-
+ * Copyright (c) 2011 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* NETBSD ORIGINAL: external/bsd/file/dist/src/getline.c */
+
+#include "includes.h"
+
+#if 0
+#include "file.h"
+#endif
+
+#if !HAVE_GETLINE
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+static ssize_t
+getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
+{
+	char *ptr, *eptr;
+
+
+	if (*buf == NULL || *bufsiz == 0) {
+		*bufsiz = BUFSIZ;
+		if ((*buf = malloc(*bufsiz)) == NULL)
+			return -1;
+	}
+
+	for (ptr = *buf, eptr = *buf + *bufsiz;;) {
+		int c = fgetc(fp);
+		if (c == -1) {
+			if (feof(fp)) {
+				ssize_t diff = (ssize_t)(ptr - *buf);
+				if (diff != 0) {
+					*ptr = '\0';
+					return diff;
+				}
+			}
+			return -1;
+		}
+		*ptr++ = c;
+		if (c == delimiter) {
+			*ptr = '\0';
+			return ptr - *buf;
+		}
+		if (ptr + 2 >= eptr) {
+			char *nbuf;
+			size_t nbufsiz = *bufsiz * 2;
+			ssize_t d = ptr - *buf;
+			if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
+				return -1;
+			*buf = nbuf;
+			*bufsiz = nbufsiz;
+			eptr = nbuf + nbufsiz;
+			ptr = nbuf + d;
+		}
+	}
+}
+
+ssize_t
+getline(char **buf, size_t *bufsiz, FILE *fp)
+{
+	return getdelim(buf, bufsiz, '\n', fp);
+}
+
+#endif
+
+#ifdef TEST
+int
+main(int argc, char *argv[])
+{
+	char *p = NULL;
+	ssize_t len;
+	size_t n = 0;
+
+	while ((len = getline(&p, &n, stdin)) != -1)
+		(void)printf("%" SIZE_T_FORMAT "d %s", len, p);
+	free(p);
+	return 0;
+}
+#endif

openbsd-compat/openbsd-compat.h

@@ -60,6 +60,10 @@ int bindresvport_sa(int sd, struct sockaddr *sa);
 void closefrom(int);
 #endif
 
+#ifndef HAVE_GETLINE
+ssize_t getline(char **, size_t *, FILE *);
+#endif
+
 #ifndef HAVE_GETPAGESIZE
 int getpagesize(void);
 #endif