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Diffstat (limited to 'qemu-io-cmds.c')
-rw-r--r--qemu-io-cmds.c67
1 files changed, 66 insertions, 1 deletions
diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 8b1244601e..fa8d9a0c38 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -1795,6 +1795,71 @@ static const cmdinfo_t abort_cmd = {
.oneline = "simulate a program crash using abort(3)",
};
+static void help_oneline(const char *cmd, const cmdinfo_t *ct)
+{
+ if (cmd) {
+ printf("%s ", cmd);
+ } else {
+ printf("%s ", ct->name);
+ if (ct->altname) {
+ printf("(or %s) ", ct->altname);
+ }
+ }
+
+ if (ct->args) {
+ printf("%s ", ct->args);
+ }
+ printf("-- %s\n", ct->oneline);
+}
+
+static void help_onecmd(const char *cmd, const cmdinfo_t *ct)
+{
+ help_oneline(cmd, ct);
+ if (ct->help) {
+ ct->help();
+ }
+}
+
+static void help_all(void)
+{
+ const cmdinfo_t *ct;
+
+ for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++) {
+ help_oneline(ct->name, ct);
+ }
+ printf("\nUse 'help commandname' for extended help.\n");
+}
+
+static int help_f(BlockDriverState *bs, int argc, char **argv)
+{
+ const cmdinfo_t *ct;
+
+ if (argc == 1) {
+ help_all();
+ return 0;
+ }
+
+ ct = find_command(argv[1]);
+ if (ct == NULL) {
+ printf("command %s not found\n", argv[1]);
+ return 0;
+ }
+
+ help_onecmd(argv[1], ct);
+ return 0;
+}
+
+static const cmdinfo_t help_cmd = {
+ .name = "help",
+ .altname = "?",
+ .cfunc = help_f,
+ .argmin = 0,
+ .argmax = 1,
+ .flags = CMD_FLAG_GLOBAL,
+ .args = "[command]",
+ .oneline = "help for one or all commands",
+};
+
static int init_check_command(BlockDriverState *bs, const cmdinfo_t *ct)
{
if (ct->flags & CMD_FLAG_GLOBAL) {
@@ -1834,7 +1899,7 @@ bool qemuio_command(const char *cmd)
static void __attribute((constructor)) init_qemuio_commands(void)
{
/* initialize commands */
- help_init();
+ add_command(&help_cmd);
add_command(&read_cmd);
add_command(&readv_cmd);
add_command(&write_cmd);