read_file: introduce read_file_2

read_file has some limitations:

- It is not possible to check the error code since read_file returns
  NULL for failure
- It is not possible to limit the buffer size to sensible limits.

This patch introduces read_file_2 which doesn't have these limitations.
read_file becomes a wrapper around read_file_2.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/libfile.h b/include/libfile.h
index d47a11198c..4a25a9153c 100644
--- a/include/libfile.h
+++ b/include/libfile.h
@@ -8,6 +8,9 @@ char *read_file_line(const char *fmt, ...);
 
 void *read_file(const char *filename, size_t *size);
 
+int read_file_2(const char *filename, size_t *size, void **outbuf,
+		loff_t max_size);
+
 int write_file(const char *filename, void *buf, size_t size);
 
 int copy_file(const char *src, const char *dst, int verbose);