text_file: convert to C++

src/TextFile.cxx

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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
+ * (at your option) 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "TextFile.hxx"
+
+#include <assert.h>
+#include <string.h>
+
+char *
+read_text_line(FILE *file, GString *buffer)
+{
+	enum {
+		max_length = 512 * 1024,
+		step = 1024,
+	};
+
+	gsize length = 0, i;
+	char *p;
+
+	assert(file != NULL);
+	assert(buffer != NULL);
+
+	if (buffer->allocated_len < step)
+		g_string_set_size(buffer, step);
+
+	while (buffer->len < max_length) {
+		p = fgets(buffer->str + length,
+			  buffer->allocated_len - length, file);
+		if (p == NULL) {
+			if (length == 0 || ferror(file))
+				return NULL;
+			break;
+		}
+
+		i = strlen(buffer->str + length);
+		length += i;
+		if (i < step - 1 || buffer->str[length - 1] == '\n')
+			break;
+
+		g_string_set_size(buffer, length + step);
+	}
+
+	/* remove the newline characters */
+	if (buffer->str[length - 1] == '\n')
+		--length;
+	if (buffer->str[length - 1] == '\r')
+		--length;
+
+	g_string_set_size(buffer, length);
+	return buffer->str;
+}