provide a simple stand-alone implementation of getline(3)

for systems lacking it

1 files changed, 68 insertions, 0 deletions

diff --git a/compat_getline.c b/compat_getline.c
new file mode 100644
index 00000000..aed4754f
--- /dev/null
+++ b/compat_getline.c
@@ -0,0 +1,68 @@
+#include "config.h"
+
+#if HAVE_GETLINE
+
+int dummy;
+
+#else
+
+/*	$Id: compat_getline.c,v 1.1 2015/11/07 20:52:52 schwarze Exp $ */
+/*
+ * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+ssize_t
+getline(char **buf, size_t *bufsz, FILE *fp)
+{
+	char	*nbuf;
+	size_t	 nbufsz, pos;
+	int	 c;
+
+	if (buf == NULL || bufsz == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (*buf == NULL)
+		*bufsz = 0;
+	else
+		**buf = '\0';
+
+	pos = 0;
+	for (;;) {
+		if (pos + 1 >= *bufsz) {
+			nbufsz = *bufsz ? *bufsz * 2 : BUFSIZ;
+			if ((nbuf = realloc(*buf, nbufsz)) == NULL)
+				return -1;
+			*buf = nbuf;
+			*bufsz = nbufsz;
+		}
+		if ((c = fgetc(fp)) == EOF) {
+			(*buf)[pos] = '\0';
+			return pos > 0 && feof(fp) ? (ssize_t)pos : -1;
+		}
+		(*buf)[pos++] = c;
+		(*buf)[pos] = '\0';
+		if (c == '\n')
+			return pos;
+	}
+}
+
+#endif