[PATCH yavta 6/7] Support setting control from values stored in a file

[Laurent Pinchart]

Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
---
 yavta.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/yavta.c b/yavta.c
index 1490878c6f7e..2d49131a4271 100644
--- a/yavta.c
+++ b/yavta.c
@@ -1334,6 +1334,31 @@ static int video_parse_control_array(const struct 
v4l2_query_ext_ctrl *query,
        __u32 value;
 
        for ( ; isspace(*val); ++val) { };
+
+       if (*val == '<') {
+               /* Read the control value from the given file. */
+               ssize_t size;
+               int fd;
+
+               val++;
+               fd = open(val, O_RDONLY);
+               if (fd < 0) {
+                       printf("unable to open control file `%s'\n", val);
+                       return -EINVAL;
+               }
+
+               size = read(fd, ctrl->ptr, ctrl->size);
+               if (size != (ssize_t)ctrl->size) {
+                       printf("error reading control file `%s' (%s)\n", val,
+                              strerror(errno));
+                       close(fd);
+                       return -EINVAL;
+               }
+
+               close(fd);
+               return 0;
+       }
+
        if (*val++ != '{')
                return -EINVAL;
 
-- 
Regards,

Laurent Pinchart