[XEN PATCH v2] xl: constify cmd_table entries

[Anthony PERARD <anthony.perard@citrix.com>]

Also constify cmdtable_len and make use of ARRAY_SIZE, which is
available in "xen-tools/libs.h".

The entries in cmd_table don't need to be modified once xl is running.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
---

Notes:
    v2:
    - use ARRAY_SIZE()
    - rework commit message

 tools/xl/xl.c          | 4 ++--
 tools/xl/xl.h          | 6 +++---
 tools/xl/xl_cmdtable.c | 9 +++++----
 3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/tools/xl/xl.c b/tools/xl/xl.c
index 3a8929580212..4107d10fd469 100644
--- a/tools/xl/xl.c
+++ b/tools/xl/xl.c
@@ -362,7 +362,7 @@ int main(int argc, char **argv)
 {
     int opt = 0;
     char *cmd = 0;
-    struct cmd_spec *cspec;
+    const struct cmd_spec *cspec;
     int ret;
     void *config_data = 0;
     int config_len = 0;
@@ -462,7 +462,7 @@ int child_report(xlchildnum child)
 void help(const char *command)
 {
     int i;
-    struct cmd_spec *cmd;
+    const struct cmd_spec *cmd;
 
     if (!command || !strcmp(command, "help")) {
         printf("Usage xl [-vfNtT] <subcommand> [args]\n\n");
diff --git a/tools/xl/xl.h b/tools/xl/xl.h
index 137a29077c1e..e5a106dfbc82 100644
--- a/tools/xl/xl.h
+++ b/tools/xl/xl.h
@@ -218,10 +218,10 @@ int main_qemu_monitor_command(int argc, char **argv);
 void help(const char *command);
 
 extern const char *common_domname;
-extern struct cmd_spec cmd_table[];
-extern int cmdtable_len;
+extern const struct cmd_spec cmd_table[];
+extern const int cmdtable_len;
 /* Look up a command in the table, allowing unambiguous truncation */
-struct cmd_spec *cmdtable_lookup(const char *s);
+const struct cmd_spec *cmdtable_lookup(const char *s);
 
 extern libxl_ctx *ctx;
 extern xentoollog_logger_stdiostream *logger;
diff --git a/tools/xl/xl_cmdtable.c b/tools/xl/xl_cmdtable.c
index 07f54daabec3..661323d4884e 100644
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -15,10 +15,11 @@
 #include <string.h>
 
 #include <libxl.h>
+#include <xen-tools/libs.h>
 
 #include "xl.h"
 
-struct cmd_spec cmd_table[] = {
+const struct cmd_spec cmd_table[] = {
     { "create",
       &main_create, 1, 1,
       "Create a domain from config file <filename>",
@@ -631,12 +632,12 @@ struct cmd_spec cmd_table[] = {
     },
 };
 
-int cmdtable_len = sizeof(cmd_table)/sizeof(struct cmd_spec);
+const int cmdtable_len = ARRAY_SIZE(cmd_table);
 
 /* Look up a command in the table, allowing unambiguous truncation */
-struct cmd_spec *cmdtable_lookup(const char *s)
+const struct cmd_spec *cmdtable_lookup(const char *s)
 {
-    struct cmd_spec *cmd = NULL;
+    const struct cmd_spec *cmd = NULL;
     size_t len;
     int i, count = 0;
 
-- 
Anthony PERARD