Add new parameter to do_eval so that only unescaped variables in input string...

Add new parameter to do_eval so that only unescaped variables in input string is expanded and rest of string is left untouched.


client/mysqltest.c:
  Add new parameter to 'do_eval' that will add any escape chars found in the input string to the output string. 
  This is used in 'do_system' and in 'do_exec' where only unescaped variables
  will be expanded, rest of the string will be left untouched.
mysql-test/r/mysqltest.result:
  Update test result
mysql-test/t/mysqldump.test:
  Revert previous patch that added extra \\ in "exec" command
mysql-test/t/mysqltest.test:
  Revert previous patch that added extra \\ in exec command

client/mysqltest.c

@@ -457,7 +457,8 @@ static int insert_pointer_name(reg1 POINTER_ARRAY *pa,my_string name);
 static void replace_strings_append(struct st_replace *rep, DYNAMIC_STRING* ds,
                                    const char *from, int len);
 void free_pointer_array(POINTER_ARRAY *pa);
-static void do_eval(DYNAMIC_STRING *query_eval, const char *query);
+static void do_eval(DYNAMIC_STRING *query_eval, const char *query,
+                    my_bool pass_through_escape_chars);
 static void str_to_file(const char *fname, char *str, int size);
 
 #ifdef __WIN__
@@ -489,7 +490,8 @@ static void handle_error(const char *query, struct st_query *q,
 			 const char *err_sqlstate, DYNAMIC_STRING *ds);
 static void handle_no_error(struct st_query *q);
 
-static void do_eval(DYNAMIC_STRING* query_eval, const char *query)
+static void do_eval(DYNAMIC_STRING* query_eval, const char *query,
+                    my_bool pass_through_escape_chars)
 {
   const char *p;
   register char c, next_c;
@@ -524,6 +526,12 @@ static void do_eval(DYNAMIC_STRING* query_eval, const char *query)
       {
         /* Set escaped only if next char is \ or $ */
 	escaped = 1;
+
+        if (pass_through_escape_chars)
+        {
+          /* The escape char should be added to the output string. */
+          dynstr_append_mem(query_eval, p, 1);
+        }
       }
       else
 	dynstr_append_mem(query_eval, p, 1);
@@ -713,7 +721,7 @@ static int dyn_string_cmp(DYNAMIC_STRING* ds, const char *fname)
   init_dynamic_string(&res_ds, "", 0, 65536);
   if (eval_result)
   {
-    do_eval(&res_ds, tmp);
+    do_eval(&res_ds, tmp, FALSE);
     res_ptr = res_ds.str;
     if ((res_len = res_ds.length) != ds->length)
     {
@@ -1085,7 +1093,7 @@ static void do_exec(struct st_query *query)
 
   init_dynamic_string(&ds_cmd, 0, strlen(cmd)+256, 256);
   /* Eval the command, thus replacing all environment variables */
-  do_eval(&ds_cmd, cmd);
+  do_eval(&ds_cmd, cmd, TRUE);
   cmd= ds_cmd.str;
 
   DBUG_PRINT("info", ("Executing '%s' as '%s'",
@@ -1379,7 +1387,7 @@ int do_system(struct st_query *command)
   init_dynamic_string(&ds_cmd, 0, strlen(command->first_argument) + 64, 256);
 
   /* Eval the system command, thus replacing all environment variables */
-  do_eval(&ds_cmd, command->first_argument);
+  do_eval(&ds_cmd, command->first_argument, TRUE);
 
   DBUG_PRINT("info", ("running system command '%s' as '%s'",
                       command->first_argument, ds_cmd.str));
@@ -3984,7 +3992,7 @@ static void run_query(MYSQL *mysql, struct st_query *command, int flags)
   if (command->type == Q_EVAL)
   {
     init_dynamic_string(&eval_query, "", 16384, 65536);
-    do_eval(&eval_query, command->query);
+    do_eval(&eval_query, command->query, FALSE);
     query = eval_query.str;
     query_len = eval_query.length;
   }

mysql-test/r/mysqltest.result

@@ -218,7 +218,7 @@ mysqltest: At line 1: Missing variable name in let
 mysqltest: At line 1: Variable name in hi=hi does not start with '$'
 mysqltest: At line 1: Missing assignment operator in let
 mysqltest: At line 1: Missing assignment operator in let
-mysqltest: At line 1: Missing arguments to let
+mysqltest: At line 1: Missing assignment operator in let
 mysqltest: At line 1: Missing variable name in let
 mysqltest: At line 1: Variable name in =hi does not start with '$'
 mysqltest: At line 1: Missing assignment operator in let

mysql-test/t/mysqldump.test

@@ -647,7 +647,7 @@ select '------ Testing with illegal table names ------' as test_sequence ;
 --exec $MYSQL_DUMP --compact --skip-comments mysqldump_test_db  "\\t1" 2>&1
  
 --error 6
---exec $MYSQL_DUMP --compact --skip-comments mysqldump_test_db  "\\\\\\t1" 2>&1
+--exec $MYSQL_DUMP --compact --skip-comments mysqldump_test_db  "\\\\t1" 2>&1
 
 --error 6
 --exec $MYSQL_DUMP --compact --skip-comments mysqldump_test_db  "t\1" 2>&1

mysql-test/t/mysqltest.test

@@ -678,7 +678,7 @@ echo $i;
 --error 1
 --exec echo "inc i;" | $MYSQL_TEST 2>&1
 --error 1
---exec echo "let \\\$i=100; inc \\\$i 1000; echo \\\$i;" | $MYSQL_TEST 2>&1
+--exec echo "let \$i=100; inc \$i 1000; echo \$i;" | $MYSQL_TEST 2>&1
 
 inc $i; inc $i; inc $i; --echo $i
 echo $i;
@@ -706,7 +706,7 @@ echo $d;
 --error 1
 --exec echo "dec i;" | $MYSQL_TEST 2>&1
 --error 1
---exec echo "let \\\$i=100; dec \\\$i 1000; echo \\\$i;" | $MYSQL_TEST 2>&1
+--exec echo "let \$i=100; dec \$i 1000; echo \$i;" | $MYSQL_TEST 2>&1
 
 
 # ----------------------------------------------------------------------------
@@ -761,11 +761,11 @@ while ($i)
 --error 1
 --exec echo "source include/mysqltest_while.inc;" | $MYSQL_TEST 2>&1
 --error 1
---exec echo "while \\\$i;" | $MYSQL_TEST 2>&1
+--exec echo "while \$i;" | $MYSQL_TEST 2>&1
 --error 1
---exec echo "while (\\\$i;" | $MYSQL_TEST 2>&1
+--exec echo "while (\$i;" | $MYSQL_TEST 2>&1
 --error 1
---exec echo "let \\\$i=1; while (\\\$i) dec \\\$i;" | $MYSQL_TEST 2>&1
+--exec echo "let \$i=1; while (\$i) dec \$i;" | $MYSQL_TEST 2>&1
 --error 1
 --exec echo "};" | $MYSQL_TEST 2>&1
 --error 1
@@ -877,22 +877,22 @@ select "a" as col1, "c" as col2;
 --exec echo "connect (con1,localhost,root,,,,,SMTP POP);" | $MYSQL_TEST 2>&1
 
 # Repeat connect/disconnect
---exec echo "let \\\$i=100;"                            > var/tmp/con.sql
---exec echo "while (\\\$i)"                            >> var/tmp/con.sql
+--exec echo "let  \$i=100;"                             > var/tmp/con.sql
+--exec echo "while (\$i)"                              >> var/tmp/con.sql
 --exec echo "{"                                        >> var/tmp/con.sql
 --exec echo " connect (test_con1,localhost,root,,);  " >> var/tmp/con.sql
 --exec echo " disconnect test_con1; "                  >> var/tmp/con.sql
---exec echo " dec \\\$i;                             " >> var/tmp/con.sql
+--exec echo " dec \$i;                               " >> var/tmp/con.sql
 --exec echo "}"                                        >> var/tmp/con.sql
 --exec echo "source var/tmp/con.sql; echo OK;" | $MYSQL_TEST 2>&1
 
 # Repeat connect/disconnect, exceed max number of connections
---exec echo "let \\\$i=200;"                            > var/tmp/con.sql
---exec echo "while (\\\$i)"                            >> var/tmp/con.sql
+--exec echo "let \$i=200;"                              > var/tmp/con.sql
+--exec echo "while (\$i)"                              >> var/tmp/con.sql
 --exec echo "{"                                        >> var/tmp/con.sql
 --exec echo " connect (test_con1,localhost,root,,); "  >> var/tmp/con.sql
 --exec echo " disconnect test_con1; "                  >> var/tmp/con.sql
---exec echo " dec \\\$i;                             " >> var/tmp/con.sql
+--exec echo " dec \$i;                              "  >> var/tmp/con.sql
 --exec echo "}"                                        >> var/tmp/con.sql
 --error 1
 --exec echo "source var/tmp/con.sql;" | $MYSQL_TEST 2>&1
@@ -1001,7 +1001,7 @@ select "this will be executed";
 #
 # Test that a test file that does not generate any output fails.
 #
---exec echo "let \\\$i= 1;" > $MYSQL_TEST_DIR/var/tmp/query.sql
+--exec echo "let \$i= 1;" > $MYSQL_TEST_DIR/var/tmp/query.sql
 --error 1
 --exec $MYSQL_TEST -x var/tmp/query.sql  2>&1