1 files changed, 130 insertions, 0 deletions
diff --git a/lib/util/src/get_line.c b/lib/util/src/get_line.c
new file mode 100644
index 0000000..5a17b62
--- /dev/null
+++ b/lib/util/src/get_line.c
@@ -0,0 +1,130 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * get_line.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "util/parse.h"
+#include "sqfs/io.h"
+#include "sqfs/error.h"
+#include "compat.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+static void ltrim(char *buffer)
+{
+	size_t i = 0;
+
+	while (isspace(buffer[i]))
+		++i;
+
+	if (i > 0)
+		memmove(buffer, buffer + i, strlen(buffer + i) + 1);
+}
+
+static void rtrim(char *buffer)
+{
+	size_t i = strlen(buffer);
+
+	while (i > 0 && isspace(buffer[i - 1]))
+		--i;
+
+	buffer[i] = '\0';
+}
+
+static size_t trim(char *buffer, int flags)
+{
+	if (flags & ISTREAM_LINE_LTRIM)
+		ltrim(buffer);
+
+	if (flags & ISTREAM_LINE_RTRIM)
+		rtrim(buffer);
+
+	return strlen(buffer);
+}
+
+int istream_get_line(sqfs_istream_t *strm, char **out,
+		     size_t *line_num, int flags)
+{
+	char *line = NULL, *new;
+	size_t line_len = 0;
+	int err;
+
+	for (;;) {
+		bool have_line = false;
+		size_t i, count, avail;
+		const sqfs_u8 *ptr;
+
+		err = strm->get_buffered_data(strm, &ptr, &avail, 0);
+		if (err < 0)
+			goto fail;
+		if (err > 0) {
+			if (line_len == 0)
+				goto out_eof;
+
+			line_len = trim(line, flags);
+			if (line_len > 0 ||!(flags & ISTREAM_LINE_SKIP_EMPTY))
+				break;
+
+			goto out_eof;
+		}
+
+		for (i = 0; i < avail; ++i) {
+			if (ptr[i] == '\n')
+				break;
+		}
+
+		if (i < avail) {
+			count = i++;
+			have_line = true;
+		} else {
+			count = i;
+		}
+
+		new = realloc(line, line_len + count + 1);
+		if (new == NULL) {
+			err = SQFS_ERROR_ALLOC;
+			goto fail;
+		}
+
+		line = new;
+		memcpy(line + line_len, ptr, count);
+		line_len += count;
+		line[line_len] = '\0';
+
+		strm->advance_buffer(strm, i);
+
+		if (have_line) {
+			if (line_len > 0 && line[line_len - 1] == '\r')
+				line[--line_len] = '\0';
+
+			line_len = trim(line, flags);
+			if (line_len > 0 || !(flags & ISTREAM_LINE_SKIP_EMPTY))
+				break;
+
+			free(line);
+			line = NULL;
+			*line_num += 1;
+		}
+	}
+
+	new = realloc(line, line_len + 1);
+	if (new != NULL)
+		line = new;
+
+	*out = line;
+	return 0;
+fail: {
+	os_error_t temp = get_os_error_state();
+	free(line);
+	*out = NULL;
+	set_os_error_state(temp);
+	return err;
+}
+out_eof:
+	free(line);
+	*out = NULL;
+	return 1;
+}