libraries: fgetln() from pkgsrc branch.

lib/libc/other/Makefile.inc

@@ -53,6 +53,7 @@ SRCS+=  \
 	flock.c \
 	fslib.c \
 	fts.c \
+	fgetln.c \
 	fsversion.c \
 	getgrent.c \
 	getlogin.c \

lib/libc/other/fgetln.c

@@ -0,0 +1,81 @@
+/*	$NetBSD: fgetln.c,v 1.5 2008/04/29 05:46:08 martin Exp $	*/
+
+/*-
+ * Copyright (c) 1998 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+/*
+ * XXX: This implementation doesn't quite conform to the specification
+ * in the man page, in that it only manages one buffer at all, not one
+ * per stdio stream. Since the previous implementation did the same,
+ * this won't break anything new.
+ */
+char *
+fgetln(fp, len)
+	FILE *fp;
+	size_t *len;
+{
+	static char *buf = NULL;
+	static size_t bufsiz = 0;
+	static size_t buflen = 0;
+	int c;
+
+	if (buf == NULL) {
+		bufsiz = BUFSIZ;
+		if ((buf = malloc(bufsiz)) == NULL)
+			return NULL;
+	}
+
+	buflen = 0;
+	while ((c = fgetc(fp)) != EOF) {
+		if (buflen >= bufsiz) {
+			size_t nbufsiz = bufsiz + BUFSIZ;
+			char *nbuf = realloc(buf, nbufsiz);
+
+			if (nbuf == NULL) {
+				int oerrno = errno;
+				free(buf);
+				errno = oerrno;
+				buf = NULL;
+				return NULL;
+			}
+
+			buf = nbuf;
+			bufsiz = nbufsiz;
+		}
+		buf[buflen++] = c;
+		if (c == '\n')
+			break;
+	}
+	*len = buflen;
+	return buflen == 0 ? NULL : buf;
+}