1 files changed, 111 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/core/linebuf.c b/contrib/syslinux-4.02/gpxe/src/core/linebuf.c
new file mode 100644
index 0000000..221f4e1
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/core/linebuf.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/**
+ * @file
+ *
+ * Line buffering
+ *
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <gpxe/linebuf.h>
+
+/**
+ * Retrieve buffered-up line
+ *
+ * @v linebuf		Line buffer
+ * @ret line		Buffered line, or NULL if no line ready to read
+ */
+char * buffered_line ( struct line_buffer *linebuf ) {
+	return ( linebuf->ready ? linebuf->data : NULL );
+}
+
+/**
+ * Discard line buffer contents
+ *
+ * @v linebuf		Line buffer
+ */
+void empty_line_buffer ( struct line_buffer *linebuf ) {
+	free ( linebuf->data );
+	linebuf->data = NULL;
+	linebuf->len = 0;
+	linebuf->ready = 0;
+}
+
+/**
+ * Buffer up received data by lines
+ *
+ * @v linebuf			Line buffer
+ * @v data			New data to add
+ * @v len			Length of new data to add
+ * @ret len			Consumed length, or negative error number
+ *
+ * After calling line_buffer(), use buffered_line() to determine
+ * whether or not a complete line is available.  Carriage returns and
+ * newlines will have been stripped, and the line will be
+ * NUL-terminated.  This buffered line is valid only until the next
+ * call to line_buffer() (or to empty_line_buffer()).
+ *
+ * Note that line buffers use dynamically allocated storage; you
+ * should call empty_line_buffer() before freeing a @c struct @c
+ * line_buffer.
+ */
+ssize_t line_buffer ( struct line_buffer *linebuf,
+		      const char *data, size_t len ) {
+	const char *eol;
+	size_t consume;
+	size_t new_len;
+	char *new_data;
+
+	/* Free any completed line from previous iteration */
+	if ( linebuf->ready )
+		empty_line_buffer ( linebuf );
+
+	/* Search for line terminator */
+	if ( ( eol = memchr ( data, '\n', len ) ) ) {
+		consume = ( eol - data + 1 );
+	} else {
+		consume = len;
+	}
+
+	/* Reallocate data buffer and copy in new data */
+	new_len = ( linebuf->len + consume );
+	new_data = realloc ( linebuf->data, ( new_len + 1 ) );
+	if ( ! new_data )
+		return -ENOMEM;
+	memcpy ( ( new_data + linebuf->len ), data, consume );
+	new_data[new_len] = '\0';
+	linebuf->data = new_data;
+	linebuf->len = new_len;
+
+	/* If we have reached end of line, trim the line and mark as ready */
+	if ( eol ) {
+		linebuf->data[--linebuf->len] = '\0'; /* trim NL */
+		if ( linebuf->data[linebuf->len - 1] == '\r' )
+			linebuf->data[--linebuf->len] = '\0'; /* trim CR */
+		linebuf->ready = 1;
+	}
+
+	return consume;
+}