coverity medium warnings

client/mysql.cc

@@ -4803,10 +4803,11 @@ com_status(String *buffer __attribute__((unused)),
     tee_fprintf(stdout, "Protocol:\t\tCompressed\n");
 #endif
 
-  if ((status_str= mysql_stat(&mysql)) && !mysql_error(&mysql)[0])
+  const char *pos;
+  if ((status_str= mysql_stat(&mysql)) && !mysql_error(&mysql)[0] &&
+      (pos= strchr(status_str,' ')))
   {
     ulong sec;
-    const char *pos= strchr(status_str,' ');
     /* print label */
     tee_fprintf(stdout, "%.*s\t\t\t", (int) (pos-status_str), status_str);
     if ((status_str= str2int(pos,10,0,LONG_MAX,(long*) &sec)))

client/mysql_upgrade.c

@@ -1083,6 +1083,8 @@ int main(int argc, char **argv)
   {
     int fd= create_temp_file(cnf_file_path, opt_tmpdir[0] ? opt_tmpdir : NULL,
                              "mysql_upgrade-", O_CREAT | O_WRONLY, MYF(MY_FAE));
+    if (fd < 0)
+      die(NULL);
     my_write(fd, USTRING_WITH_LEN( "[client]\n"), MYF(MY_FAE));
     my_write(fd, (uchar*)ds_args.str, ds_args.length, MYF(MY_FAE));
     my_close(fd, MYF(0));

client/mysqldump.c

@@ -92,8 +92,7 @@
 
 static void add_load_option(DYNAMIC_STRING *str, const char *option,
                              const char *option_value);
-static ulong find_set(TYPELIB *lib, const char *x, size_t length,
-                      char **err_pos, uint *err_len);
+static ulong find_set(TYPELIB *, const char *, size_t, char **, uint *);
 static char *alloc_query_str(ulong size);
 
 static void field_escape(DYNAMIC_STRING* in, const char *from);
@@ -5373,7 +5372,7 @@ static ulong find_set(TYPELIB *lib, const char *x, size_t length,
       var_len= (uint) (pos - start);
       strmake(buff, start, MY_MIN(sizeof(buff) - 1, var_len));
       find= find_type(buff, lib, FIND_TYPE_BASIC);
-      if (!find)
+      if (find <= 0)
       {
         *err_pos= (char*) start;
         *err_len= var_len;

client/mysqlimport.c

@@ -675,7 +675,7 @@ int main(int argc, char **argv)
                                                  MYF(0))))
       return -2;
 
-    for (counter= 0; *argv != NULL; argv++) /* Loop through tables */
+    for (; *argv != NULL; argv++) /* Loop through tables */
     {
       pthread_mutex_lock(&counter_mutex);
       while (counter == opt_use_threads)

client/mysqltest.cc

@@ -600,7 +600,7 @@ void do_eval(DYNAMIC_STRING *query_eval, const char *query,
 void str_to_file(const char *fname, char *str, int size);
 void str_to_file2(const char *fname, char *str, int size, my_bool append);
 
-void fix_win_paths(const char *val, int len);
+void fix_win_paths(const char *val, size_t len);
 const char *get_errname_from_code (uint error_code);
 int multi_reg_replace(struct st_replace_regex* r,char* val);
 
@@ -814,8 +814,7 @@ class LogFile {
 LogFile log_file;
 LogFile progress_file;
 
-void replace_dynstr_append_mem(DYNAMIC_STRING *ds, const char *val,
-                               int len);
+void replace_dynstr_append_mem(DYNAMIC_STRING *ds, const char *val, size_t len);
 void replace_dynstr_append(DYNAMIC_STRING *ds, const char *val);
 void replace_dynstr_append_uint(DYNAMIC_STRING *ds, uint val);
 void dynstr_append_sorted(DYNAMIC_STRING* ds, DYNAMIC_STRING* ds_input,
@@ -2654,6 +2653,7 @@ void var_query_set(VAR *var, const char *query, const char** query_end)
   if (!mysql)
   {
     struct st_command command;
+    DBUG_ASSERT(query_end);
     memset(&command, 0, sizeof(command));
     command.query= (char*)query;
     command.first_word_len= (*query_end - query);
@@ -7530,7 +7530,7 @@ void free_win_path_patterns()
   => all \ from c:\mysql\m... until next space is converted into /
 */
 
-void fix_win_paths(const char *val, int len)
+void fix_win_paths(const char *val, size_t len)
 {
   uint i;
   char *p;
@@ -11031,7 +11031,7 @@ void free_pointer_array(POINTER_ARRAY *pa)
 
 /* Append the string to ds, with optional replace */
 void replace_dynstr_append_mem(DYNAMIC_STRING *ds,
-                               const char *val, int len)
+                               const char *val, size_t len)
 {
   char lower[512];
 #ifdef __WIN__