New -find test -name_limit_blocker. Made -file_name_limit ready for loaded ISOs

xorriso/sfile.c

@@ -937,3 +937,43 @@ decode:;
 }
 
 
+/* From libisofs:
+   Find backward from idx the start byte of a possible UTF-8 character.
+     https://en.wikipedia.org/wiki/UTF-8#Description
+*/
+static
+int find_utf8_start(char *name, int idx, int flag)
+{
+    unsigned char *uname, uch;
+    int i;
+
+    uname= (unsigned char *) name;
+    if ((uname[idx] & 0xc0) != 0x80)
+        return idx;                                /* not an UTF-8 tail byte */
+    for (i = 0; i < 5 && idx - 1 - i >= 0; i++) {
+                                            /* up to deprecated 6-byte codes */
+        uch = uname[idx - 1 - i];
+        if ((uch & 0xe0) == 0xc0 || (uch & 0xf0) == 0xe0 ||
+            (uch & 0xf8) == 0xf0 || (uch & 0xfc) == 0xf8 ||
+            (uch & 0xfe) == 0xfc)
+            return (idx - 1 - i);                  /* UTF-8 start byte found */
+        if ((uch & 0xc0) != 0x80)
+          return idx;                 /* not an UTF-8 tail byte, so no UTF-8 */
+    }
+    return idx;                                      /* no UTF-8 start found */
+}
+
+
+int Sfile_flatten_utf8_heads(char *name, int idx, int flag)
+{
+ int neck;
+
+ neck = find_utf8_start(name, idx, 0);
+ if(neck >= idx)
+   return(2);
+ for(; neck < idx; neck++)
+    name[neck] = '_';
+ return(1);
+}
+
+