minor changes

tecs/str_util.c

@@ -51,7 +51,7 @@ int str_ntrim(char *dest, const char *src, int ldest, int lsrc) {
   if (dest!=src) strncpy(dest, src, lsrc);
   dest[lsrc]='\0';
   i=strlen(dest)-1;
-  while (i>0 && dest[i]==' ') i--; /* trim sequence */
+  while (i>=0 && dest[i]==' ') i--; /* trim sequence */
   i++;
   dest[i]='\0';
   return(i);