[PATCH] Function parameters support

* [PATCH] Function parameters support
@ 2010-05-05  8:58 BVK Chaitanya
  2010-05-05 17:36 ` Seth Goldberg
  2010-05-09 13:40 ` Vladimir 'φ-coder/phcoder' Serbinenko
  0 siblings, 2 replies; 9+ messages in thread
From: BVK Chaitanya @ 2010-05-05  8:58 UTC (permalink / raw)
  To: The development of GRUB 2

[-- Attachment #1: Type: text/plain, Size: 258 bytes --]

Hi,


Attached patch adds function parameters ($1, $2, etc. and $#) support
to GRUB script..  Shell expansion for "$@" and $@ specials is not yet
available.

PS:  It needs to be applied over my earlier, remove grub_script_cmdblock patch.


-- 
bvk.chaitanya

[-- Attachment #2: func-params.patch.txt --]
[-- Type: text/plain, Size: 19328 bytes --]

# Bazaar merge directive format 2 (Bazaar 0.90)
# revision_id: bvk.groups@gmail.com-20100505082146-vfynovl8d0b4iyrd
# target_branch: ../mainline/
# testament_sha1: 2fefe3c7a1fd759379827e43db3f0ea5433e011e
# timestamp: 2010-05-05 14:05:34 +0530
# base_revision_id: phcoder@gmail.com-20100503111712-7ilqdfmu0zesel3c
# 
# Begin patch
=== modified file 'conf/tests.rmk'

--- conf/tests.rmk	2010-04-30 08:20:41 +0000
+++ conf/tests.rmk	2010-05-05 08:21:46 +0000
@@ -71,6 +71,9 @@
 check_SCRIPTS += grub_script_comments
 grub_script_comments_SOURCES = tests/grub_script_comments.in
 
+check_SCRIPTS += grub_script_functions
+grub_script_functions_SOURCES = tests/grub_script_functions.in
+
 # List of tests to execute on "make check"
 # SCRIPTED_TESTS    = example_scripted_test
 # SCRIPTED_TESTS   += example_grub_script_test
@@ -87,6 +90,7 @@
 SCRIPTED_TESTS += grub_script_final_semicolon
 SCRIPTED_TESTS += grub_script_dollar
 SCRIPTED_TESTS += grub_script_comments
+SCRIPTED_TESTS += grub_script_functions
 
 # dependencies between tests and testing-tools
 $(SCRIPTED_TESTS): grub-shell grub-shell-tester

=== modified file 'include/grub/script_sh.h'
--- include/grub/script_sh.h	2010-03-26 15:43:06 +0000
+++ include/grub/script_sh.h	2010-05-05 08:21:46 +0000
@@ -73,6 +73,15 @@
   int argcount;
 };
 
+/* Scope for grub script constructs.  */
+struct grub_script_scope
+{
+  struct grub_script_scope *next;
+
+  char **args;
+  unsigned int argc;
+};
+
 /* A single command line.  */
 struct grub_script_cmdline
 {
@@ -82,15 +91,6 @@
   struct grub_script_arglist *arglist;
 };
 
-/* A block of commands, this can be used to group commands.  */
-struct grub_script_cmdblock
-{
-  struct grub_script_cmd cmd;
-
-  /* A chain of commands.  */
-  struct grub_script_cmd *cmdlist;
-};
-
 /* An if statement.  */
 struct grub_script_cmdif
 {
@@ -234,8 +234,6 @@
 struct grub_script_cmd *
 grub_script_create_cmdline (struct grub_parser_param *state,
 			    struct grub_script_arglist *arglist);
-struct grub_script_cmd *
-grub_script_create_cmdblock (struct grub_parser_param *state);
 
 struct grub_script_cmd *
 grub_script_create_cmdif (struct grub_parser_param *state,
@@ -262,9 +260,9 @@
 			    int options);
 
 struct grub_script_cmd *
-grub_script_add_cmd (struct grub_parser_param *state,
-		     struct grub_script_cmdblock *cmdblock,
-		     struct grub_script_cmd *cmd);
+grub_script_append_cmd (struct grub_parser_param *state,
+			struct grub_script_cmd *list,
+			struct grub_script_cmd *last);
 struct grub_script_arg *
 grub_script_arg_add (struct grub_parser_param *state,
 		     struct grub_script_arg *arg,
@@ -301,7 +299,7 @@
 
 /* Commands to execute, don't use these directly.  */
 grub_err_t grub_script_execute_cmdline (struct grub_script_cmd *cmd);
-grub_err_t grub_script_execute_cmdblock (struct grub_script_cmd *cmd);
+grub_err_t grub_script_execute_cmdlist (struct grub_script_cmd *cmd);
 grub_err_t grub_script_execute_cmdif (struct grub_script_cmd *cmd);
 grub_err_t grub_script_execute_cmdfor (struct grub_script_cmd *cmd);
 grub_err_t grub_script_execute_cmdwhile (struct grub_script_cmd *cmd);
@@ -340,8 +338,8 @@
 void grub_script_function_remove (const char *name);
 grub_script_function_t grub_script_function_find (char *functionname);
 int grub_script_function_iterate (int (*iterate) (grub_script_function_t));
-int grub_script_function_call (grub_script_function_t func,
-			       int argc, char **args);
+grub_err_t grub_script_function_call (grub_script_function_t func,
+				      int argc, char **args);
 
 char **
 grub_script_execute_arglist_to_argv (struct grub_script_arglist *arglist, int *count);

=== modified file 'script/execute.c'
--- script/execute.c	2010-03-26 15:43:06 +0000
+++ script/execute.c	2010-05-05 08:21:46 +0000
@@ -30,6 +30,52 @@
    is sizeof (int) * 3, and one extra for a possible -ve sign.  */
 #define ERRNO_DIGITS_MAX  (sizeof (int) * 3 + 1)
 
+static struct grub_script_scope *scope = 0;
+
+static char *
+grub_script_env_get (const char *name)
+{
+  char *p = 0;
+  unsigned long num = 0;
+
+  if (! scope)
+    return grub_env_get (name);
+
+  if (grub_isdigit (name[0]))
+    {
+      num = grub_strtoul (name, &p, 10);
+      if (p && *p == '\0')
+	{
+	  if (num == 0)
+	    return 0; /* XXX no file name, for now.  */
+
+	  return (num > scope->argc ? 0 : scope->args[num - 1]);
+	}
+      else
+	{
+	  grub_error (GRUB_ERR_BAD_ARGUMENT, "bad variabe name substitution");
+	  return 0;
+	}
+    }
+  else if (grub_strcmp (name, "#") == 0)
+    {
+      static char buf[32]; /* Rewritten everytime.  */
+      grub_snprintf (buf, sizeof (buf), "%u", scope->argc);
+      return buf;
+    }
+  else
+    return grub_env_get (name);
+}
+
+static grub_err_t
+grub_script_env_set (const char *name, const char *val)
+{
+  if (grub_isdigit (name[0]) || grub_strcmp (name, "#") == 0)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad variable name");
+
+  return grub_env_set (name, val);
+}
+
 static grub_err_t
 grub_script_execute_cmd (struct grub_script_cmd *cmd)
 {
@@ -143,7 +189,7 @@
 	  switch (arg->type)
 	    {
 	    case GRUB_SCRIPT_ARG_TYPE_VAR:
-	      value = grub_env_get (arg->str);
+	      value = grub_script_env_get (arg->str);
 	      while (value && *value && (ptr = move_to_next(&value)))
 		{
 		  empty = 0;
@@ -168,7 +214,7 @@
 
 	    case GRUB_SCRIPT_ARG_TYPE_DQVAR:
 	      empty = 0;
-	      append (grub_env_get (arg->str), 0);
+	      append (grub_script_env_get (arg->str), 0);
 	      break;
 	    }
 	  arg = arg->next;
@@ -191,6 +237,23 @@
   return argv;
 }
 
+/* Execute a function call.  */
+grub_err_t
+grub_script_function_call (grub_script_function_t func, int argc, char **args)
+{
+  grub_err_t ret = 0;
+  struct grub_script_scope new_scope;
+
+  new_scope.argc = argc;
+  new_scope.args = args;
+  grub_list_push (GRUB_AS_LIST_P (&scope), GRUB_AS_LIST (&new_scope));
+
+  ret = grub_script_execute (func->func);
+
+  grub_list_pop (GRUB_AS_LIST_P (&scope));
+  return ret;
+}
+
 /* Execute a single command line.  */
 grub_err_t
 grub_script_execute_cmdline (struct grub_script_cmd *cmd)
@@ -232,12 +295,12 @@
 	      /* Create two strings and set the variable.  */
 	      *eq = '\0';
 	      eq++;
-	      grub_env_set (assign, eq);
+	      grub_script_env_set (assign, eq);
 	    }
 	  grub_free (assign);
 
 	  grub_snprintf (errnobuf, sizeof (errnobuf), "%d", grub_errno);
-	  grub_env_set ("?", errnobuf);
+	  grub_script_env_set ("?", errnobuf);
 
 	  grub_print_error ();
 
@@ -262,20 +325,20 @@
   grub_print_error ();
 
   grub_snprintf (errnobuf, sizeof (errnobuf), "%d", ret);
-  grub_env_set ("?", errnobuf);
+  grub_script_env_set ("?", errnobuf);
 
   return ret;
 }
 
 /* Execute a block of one or more commands.  */
 grub_err_t
-grub_script_execute_cmdblock (struct grub_script_cmd *cmd)
+grub_script_execute_cmdlist (struct grub_script_cmd *list)
 {
   int ret = 0;
-  struct grub_script_cmdblock *cmdblock = (struct grub_script_cmdblock *) cmd;
+  struct grub_script_cmd *cmd;
 
   /* Loop over every command and execute it.  */
-  for (cmd = cmdblock->cmdlist; cmd; cmd = cmd->next)
+  for (cmd = list->next; cmd; cmd = cmd->next)
     ret = grub_script_execute_cmd (cmd);
 
   return ret;
@@ -291,7 +354,7 @@
   /* Check if the commands results in a true or a false.  The value is
      read from the env variable `?'.  */
   grub_script_execute_cmd (cmdif->exec_to_evaluate);
-  result = grub_env_get ("?");
+  result = grub_script_env_get ("?");
 
   grub_errno = GRUB_ERR_NONE;
 
@@ -320,7 +383,7 @@
   result = 0;
   for (i = 0; i < argcount; i++)
     {
-      grub_env_set (cmdfor->name->str, args[i]);
+      grub_script_env_set (cmdfor->name->str, args[i]);
       result = grub_script_execute_cmd (cmdfor->list);
       grub_free (args[i]);
     }

=== modified file 'script/function.c'
--- script/function.c	2010-01-22 13:37:27 +0000
+++ script/function.c	2010-05-05 08:21:46 +0000
@@ -115,12 +115,3 @@
 
   return 0;
 }
-
-int
-grub_script_function_call (grub_script_function_t func,
-			   int argc __attribute__((unused)),
-			   char **args __attribute__((unused)))
-{
-  /* XXX: Arguments are not supported yet.  */
-  return grub_script_execute (func->func);
-}

=== modified file 'script/parser.y'
--- script/parser.y	2010-04-09 17:02:58 +0000
+++ script/parser.y	2010-05-05 08:21:46 +0000
@@ -96,9 +96,7 @@
         }
       | script statement delimiter newlines0
         {
-          struct grub_script_cmdblock *cmdblock;
-          cmdblock = (struct grub_script_cmdblock *) $1;
-          $$ = grub_script_add_cmd (state, cmdblock, $2);
+          $$ = grub_script_append_cmd (state, $1, $2);
         }
       | error
         {
@@ -183,17 +181,15 @@
 /* A list of commands. */
 commands1: newlines0 command
            {
-             $$ = grub_script_add_cmd (state, 0, $2);
+             $$ = grub_script_append_cmd (state, 0, $2);
            }
          | commands1 delimiters1 command
            {
-             struct grub_script_cmdblock *cmdblock;
-	     cmdblock = (struct grub_script_cmdblock *) $1;
-	     $$ = grub_script_add_cmd (state, cmdblock, $3);
+	     $$ = grub_script_append_cmd (state, $1, $3);
            }
 ;
 
-function: "function" "name" 
+function: "function" "name"
           {
             grub_script_lexer_ref (state->lexerstate);
             state->func_mem = grub_script_mem_record (state);

=== modified file 'script/script.c'
--- script/script.c	2010-01-23 05:49:26 +0000
+++ script/script.c	2010-05-05 08:21:46 +0000
@@ -291,46 +291,40 @@
   return (struct grub_script_cmd *) cmd;
 }
 
-/* Create a block of commands.  CMD contains the command that should
-   be added at the end of CMDBLOCK's list.  If CMDBLOCK is zero, a new
-   cmdblock will be created.  */
+/* Create a chain of commands.  LAST contains the command that should
+   be added at the end of LIST's list.  If LIST is zero, a new list
+   will be created.  */
 struct grub_script_cmd *
-grub_script_add_cmd (struct grub_parser_param *state,
-		     struct grub_script_cmdblock *cmdblock,
-		     struct grub_script_cmd *cmd)
+grub_script_append_cmd (struct grub_parser_param *state,
+			struct grub_script_cmd *list,
+			struct grub_script_cmd *last)
 {
   struct grub_script_cmd *ptr;
 
-  grub_dprintf ("scripting", "cmdblock\n");
-
-  if (!cmd)
-    return (struct grub_script_cmd *) cmdblock;
-
-  if (!cmdblock)
+  grub_dprintf ("scripting", "append command\n");
+
+  if (! last)
+    return list;
+
+  if (! list)
     {
-      cmdblock = grub_script_malloc (state, sizeof (*cmdblock));
-      if (!cmdblock)
+      list = grub_script_malloc (state, sizeof (*list));
+      if (! list)
 	return 0;
 
-      cmdblock->cmd.exec = grub_script_execute_cmdblock;
-      cmdblock->cmd.next = 0;
-      cmdblock->cmdlist = cmd;
-      cmd->next = 0;
+      list->exec = grub_script_execute_cmdlist;
+      list->next = last;
     }
   else
     {
-      if (!cmdblock->cmdlist)
-	cmdblock->cmdlist = cmd;
-      else
-	{
-	  ptr = cmdblock->cmdlist;
-	  while (ptr->next)
-	    ptr = ptr->next;
-	  ptr->next = cmd;
-	}
+      ptr = list;
+      while (ptr->next)
+	ptr = ptr->next;
+
+      ptr->next = last;
     }
 
-  return (struct grub_script_cmd *) cmdblock;
+  return list;
 }
 \f
 

=== modified file 'script/yylex.l'
--- script/yylex.l	2010-04-30 08:20:41 +0000
+++ script/yylex.l	2010-05-05 08:21:46 +0000
@@ -119,7 +119,8 @@
 NAME            [[:alpha:]_][[:alnum:][:digit:]_]*
 
 ESC             \\.
-VARIABLE        ${NAME}|$\{{NAME}\}|${DIGITS}|$\{{DIGITS}\}|$\?|$\{\?\}
+SPECIAL        \?|\#
+VARIABLE        ${NAME}|$\{{NAME}\}|${DIGITS}|$\{{DIGITS}\}|${SPECIAL}|$\{{SPECIAL}\}
 DQSTR           \"([^\\\"]|{ESC})*\"
 SQSTR           \'[^\']*\'
 WORD            ({CHAR}|{DQSTR}|{SQSTR}|{ESC}|{VARIABLE})+
@@ -221,7 +222,7 @@
 }
 
 <VAR>{
-  \?            |
+  {SPECIAL}     |
   {DIGITS}      |
   {NAME}        {
                   COPY (yytext, yyleng);
@@ -231,7 +232,7 @@
                   else
                     ARG (GRUB_SCRIPT_ARG_TYPE_DQVAR);
                 }
-  \{\?\}        |
+  \{{SPECIAL}\} |
   \{{DIGITS}\}  |
   \{{NAME}\}    {
                   yytext[yyleng - 1] = '\0';

=== added file 'tests/grub_script_functions.in'
--- tests/grub_script_functions.in	1970-01-01 00:00:00 +0000
+++ tests/grub_script_functions.in	2010-05-05 08:21:46 +0000
@@ -0,0 +1,63 @@
+#! @builddir@/grub-shell-tester
+
+# Run GRUB script in a Qemu instance
+# Copyright (C) 2010  Free Software Foundation, Inc.
+#
+# GRUB is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# GRUB is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+
+echo parameter count
+function fcount {
+  echo "$#"
+}
+
+fcount
+fcount a
+fcount a b
+
+echo parameter count, with nesting
+function ffcount {
+  echo "$#"
+  fcount
+  fcount a
+  fcount a b
+}
+
+ffcount
+ffcount 1
+ffcount 1 2
+
+echo parameters
+function fparam {
+  echo 1 $1
+  echo 2 $2
+  echo 3 $3
+}
+
+fparam
+fparam a
+fparam a b
+
+echo parameters, with nesting
+function ffparam {
+  echo 1 $1
+  echo 2 $2
+  echo 3 $3
+  fparam
+  fparam a
+  fparam a b
+}
+
+ffparam
+ffparam 1
+ffparam 1 2

=== modified file 'util/grub-script-check.c'
--- util/grub-script-check.c	2010-04-10 13:48:24 +0000
+++ util/grub-script-check.c	2010-05-05 08:21:46 +0000
@@ -70,7 +70,7 @@
 }
 
 grub_err_t
-grub_script_execute_cmdblock (struct grub_script_cmd *cmd __attribute__ ((unused)))
+grub_script_execute_cmdlist (struct grub_script_cmd *cmd __attribute__ ((unused)))
 {
   return 0;
 }

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