- kvm-cmd.h: Adds a new structure cmd_struct to create a table of commands
and callback function.
- kvm-cmd.c: implements two main functions for command processing.
kvm_get_command(): searches table for specific command.
handle_command(): invokes the callback function for a given command.
- kvm-help.[ch] Implements the kvm help command.
Signed-off-by: Prasad Joshi <prasadjoshi124@xxxxxxxxx>
---
tools/kvm/include/kvm/kvm-cmd.h | 12 ++++++++
tools/kvm/include/kvm/kvm-help.h | 6 ++++
tools/kvm/kvm-cmd.c | 55 ++++++++++++++++++++++++++++++++++++++
tools/kvm/kvm-help.c | 43 +++++++++++++++++++++++++++++
4 files changed, 116 insertions(+), 0 deletions(-)
create mode 100644 tools/kvm/include/kvm/kvm-cmd.h
create mode 100644 tools/kvm/include/kvm/kvm-help.h
create mode 100644 tools/kvm/kvm-cmd.c
create mode 100644 tools/kvm/kvm-help.c
diff --git a/tools/kvm/include/kvm/kvm-cmd.h b/tools/kvm/include/kvm/kvm-cmd.h
new file mode 100644
index 0000000..8d5fca5
--- /dev/null
+++ b/tools/kvm/include/kvm/kvm-cmd.h
@@ -0,0 +1,12 @@
+#ifndef __KVM_CMD_H__
+#define __KVM_CMD_H__
+
+struct cmd_struct {
+ const char *cmd;
+ int (*fn)(int, const char **, const char *);
+ int option;
+};
+
+int handle_command(struct cmd_struct *command, int argc, const char **argv);
+
+#endif
diff --git a/tools/kvm/include/kvm/kvm-help.h b/tools/kvm/include/kvm/kvm-help.h
new file mode 100644
index 0000000..2946743
--- /dev/null
+++ b/tools/kvm/include/kvm/kvm-help.h
@@ -0,0 +1,6 @@
+#ifndef __KVM_HELP_H__
+#define __KVM_HELP_H__
+
+int kvm_cmd_help(int argc, const char **argv, const char *prefix);
+
+#endif
diff --git a/tools/kvm/kvm-cmd.c b/tools/kvm/kvm-cmd.c
new file mode 100644
index 0000000..ef9a454
--- /dev/null
+++ b/tools/kvm/kvm-cmd.c
@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <assert.h>
+
+/* user defined header files */
+#include <kvm/kvm-cmd.h>
+
+/* kvm_get_command: Searches the command in an array of the commands and
+ returns a pointer to cmd_struct if a match is found.
+
+ Input parameters:
+ command: Array of possible commands. The last entry in the array must be
+ NULL.
+ cmd: A string command to search in the array
+
+ Return Value:
+ NULL: If the cmd is not matched with any of the command in the command array
+ p: Pointer to cmd_struct of the matching command
+ */
+static struct cmd_struct *kvm_get_command(struct cmd_struct *command,
+ const char *cmd)
+{
+ struct cmd_struct *p = command;
+
+ while (p->cmd) {
+ if (!strcmp(p->cmd, cmd))
+ return p;
+ p++;
+ }
+ return NULL;
+}
+
+int handle_command(struct cmd_struct *command, int argc, const char **argv)
+{
+ struct cmd_struct *p;
+ const char *prefix = NULL;
+
+ if (!argv || !*argv) {
+ p = kvm_get_command(command, "help");
+ assert(p);
+ return p->fn(argc, argv, prefix);
+ }
+
+ p = kvm_get_command(command, argv[0]);
+ if (!p) {
+ p = kvm_get_command(command, "help");
+ assert(p);
+ p->fn(argc, argv, prefix);
+ return EINVAL;
+ }
+
+ return p->fn(argc - 1, &argv[1], prefix);
+}
diff --git a/tools/kvm/kvm-help.c b/tools/kvm/kvm-help.c
new file mode 100644
index 0000000..fd133a9
--- /dev/null
+++ b/tools/kvm/kvm-help.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <string.h>
+
+/* user defined headers */
+#include <common-cmds.h>
+
+#include <kvm/util.h>
+#include <kvm/kvm-help.h>
+
+
+const char kvm_usage_string[] =
+ "kvm [--version] [--help] COMMAND [ARGS]";
+
+const char kvm_more_info_string[] =
+ "See 'kvm help COMMAND' for more information on a specific command.";
+
+
+static void list_common_cmds_help(void)
+{
+ unsigned int i, longest = 0;
+
+ for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
+ if (longest < strlen(common_cmds[i].name))
+ longest = strlen(common_cmds[i].name);
+ }
+
+ puts(" The most commonly used kvm commands are:");
+ for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
+ printf(" %-*s ", longest, common_cmds[i].name);
+ puts(common_cmds[i].help);
+ }
+}
+
+int kvm_cmd_help(int argc, const char **argv, const char *prefix)
+{
+ if (!argv || !*argv) {
+ printf("\n usage: %s\n\n", kvm_usage_string);
+ list_common_cmds_help();
+ printf("\n %s\n\n", kvm_more_info_string);
+ return 0;
+ }
+ return 0;
+}
--
1.7.1
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