X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fvsscanf.c;h=fd35889ab4d200ead2782f2a1e732c9b76fc97a7;hb=5522316811fdce2216c4d1320af68dd54909aed5;hp=c4565aada0320a307c06a044991c4acd504ce450;hpb=68525aefa7b7b1f2f769e287e1f2f3a4585005ff;p=pdclib

diff --git a/functions/stdio/vsscanf.c b/functions/stdio/vsscanf.c
index c4565aa..fd35889 100644
--- a/functions/stdio/vsscanf.c
+++ b/functions/stdio/vsscanf.c
@@ -10,22 +10,16 @@
 #include <stdarg.h>
 
 #ifndef REGTEST
+#include <ctype.h>
 
 int vsscanf( const char * _PDCLIB_restrict s, const char * _PDCLIB_restrict format, va_list arg )
 {
     struct _PDCLIB_status_t status;
     status.base = 0;
     status.flags = 0;
-    /* In _PDCLIB_print, status.n holds the maximum number of characters to be
-       written. As we don't need that for the scanf() functions, we (ab)use
-       this field to hold the number of matching conversion specifiers.
-    */
     status.n = 0; 
     status.i = 0;
     status.this = 0;
-    /* In _PDCLIB_print, status.s is the string *printed to*. In the scanf()
-       functions, we (ab)use this field to hold the string *scanned from*.
-    */
     status.s = (char *)s;
     status.width = 0;
     status.prec = 0;
@@ -65,6 +59,16 @@ int vsscanf( const char * _PDCLIB_restrict s, const char * _PDCLIB_restrict form
         }
         else
         {
+            /* NULL return code indicates input error */
+            if ( rc == NULL )
+            {
+                if ( status.n == 0 )
+                {
+                    /* input error before any conversion returns EOF */
+                    status.n = EOF;
+                }
+                break;
+            }
             /* Continue parsing after conversion specifier */
             format = rc;
         }