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).

1 files changed, 113 insertions, 0 deletions

diff --git a/openbsd-compat/bsd-getline.c b/openbsd-compat/bsd-getline.c
new file mode 100644
index 000000000..681062e80
--- /dev/null
+++ b/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