--ado

*** /tmp/,azic.c    2014-06-25 19:32:44.803874900 -0400
--- /tmp/,bzic.c    2014-06-25 19:32:44.906880800 -0400
***************
*** 134,139 ****
--- 134,140 ----
  static int    itsdir(const char * name);
  static int    lowerit(int c);
  static int    mkdirs(char * filename);
+ static void    namecheck(const char * name);
  static void    newabbr(const char * abbr);
  static zic_t    oadd(zic_t t1, zic_t t2);
  static void    outzone(const struct zone * zp, int ntzones);
***************
*** 621,632 ****
--- 622,652 ----
      return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
  }
 
+ #define BENIGN    "+-_/"
+
+ static void
+ namecheck(const char * const name)
+ {
+     register const char *    cp;
+
+     if (!noise)
+         return;
+     for (cp = name; *cp != '\0'; ++cp)
+         if (!isascii(*cp) ||
+             (!isalnum(*cp) && strchr(BENIGN, *cp) == NULL)) {
+ warning(_("file name %s has non-ASCII-alphanumeric character other than %s"),
+                     name, BENIGN);
+             return;
+         }
+ }
+
  static void
  dolink(const char *const fromfield, const char *const tofield)
  {
      register char *    fromname;
      register char *    toname;
 
+     namecheck(tofield);
      if (fromfield[0] == '/')
          fromname = ecpyalloc(fromfield);
      else {
***************
*** 1495,1500 ****
--- 1515,1521 ----
      void *typesptr = ats + timecnt;
      unsigned char *types = typesptr;
 
+     namecheck(name);
      /*
      ** Sort.
      */