[hackers] [sbase] Return number of bytes read even on a partial read || FRIGN

[git]

commit 696bb992c3b3f5536c3c204c3e7130832fdce0e6
Author: FRIGN <d...@frign.de>
Date:   Sun Feb 1 03:54:56 2015 +0100

    Return number of bytes read even on a partial read
    
    and set the rune to Runeerror for later checking (if desired).

diff --git a/libutf/readrune.c b/libutf/readrune.c
index 8fd003b..8bab478 100644
--- a/libutf/readrune.c
+++ b/libutf/readrune.c
@@ -34,7 +34,8 @@ readrune(const char *file, FILE *fp, Rune *r)
                                        file, strerror(errno));
                                exit(1);
                        }
-                       return 0;
+                       *r = Runeerror;
+                       return i;
                }
                buf[i++] = c;
                if (fullrune(buf, i)) {