lib_sscanf: fixed a hang in scanf() on end of string

if we reach end of buffer when we are not on a format specifier then the code would loop forever.
priseborough · Nov 6, 2014 · dacbc6a · dacbc6a
1 parent 423d6b0
commit dacbc6a
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/libc/stdio/lib_sscanf.c b/libc/stdio/lib_sscanf.c
@@ -699,6 +699,10 @@ int vsscanf(FAR char *buf, FAR const char *fmt, va_list ap)
               buf++;
             }
         }
+      else {
+          /* it is not a format specifier, and buf is empty. Stop matching */
+          break;
+      }
     }
 
     /* Clean up - read whitespaces */