smsutils: add some documentation

sms_assembly_add_fragment_backup: clarify how insertion spot is found

diff --git a/src/smsutil.c b/src/smsutil.c
index bc9fdad..62d8ab2 100644 (file)
--- a/src/smsutil.c
+++ b/src/smsutil.c
@@ -2521,6 +2521,13 @@ static GSList *sms_assembly_add_fragment_backup(struct sms_assembly *assembly,
                if (node->bitmap[offset] & bit)
                        return NULL;
 
+               /*
+                * Iterate over the bitmap to find in which position
+                * should the fragment be inserted -- basically we
+                * walk each bit in the bitmap until the bit we care
+                * about (offset:bit) and count which are stored --
+                * that gives us in which position we have to insert.
+                */
                position = 0;
                for (i = 0; i < offset; i++)
                        for (j = 0; j < 32; j++)