hbytes compare

[chiark-tcl.git] / base / hook.c

diff --git a/base/hook.c b/base/hook.c
index e53af08ba8e8fd8dd01cafa1c263a71df1698899..8774f7b6a3fb174a5588305052cb65dc1f8dff93 100644 (file)
--- a/base/hook.c
+++ b/base/hook.c
@@ -177,6 +177,26 @@ int do_hbytes_zeroes(ClientData cd, Tcl_Interp *ip,
   return TCL_OK;
 }
 
+int do_hbytes_compare(ClientData cd, Tcl_Interp *ip,
+                     HBytes_Value a, HBytes_Value b, int *result) {
+  int al, bl, minl, r;
+
+  al= hbytes_len(&a);
+  bl= hbytes_len(&b);
+  minl= al<bl ? al : bl;
+
+  r= memcmp(hbytes_data(&a), hbytes_data(&b), minl);
+  
+  if (r<0) *result= -2;
+  else if (r>0) *result= +2;
+  else {
+    if (al<bl) *result= -1;
+    else if (al>bl) *result= +1;
+    else *result= 0;
+  }
+  return TCL_OK;
+}
+
 int do__hbytes(ClientData cd, Tcl_Interp *ip,
               const HBytes_SubCommand *subcmd,
               int objc, Tcl_Obj *const *objv) {