Function HelpCmd

tools/ngctl/main.c:601–665

* HelpCmd() */

 * HelpCmd()
 */
static int
HelpCmd(int ac, char **av)
{
	const struct ngcmd *cmd;
	int k;

	switch (ac) {
	case 0:
	case 1:
		/* Show all commands */
		printf("Available commands:\n");
		for (k = 0; cmds[k] != NULL; k++) {
			char *s, buf[100];

			cmd = cmds[k];
			snprintf(buf, sizeof(buf), "%s", cmd->cmd);
			for (s = buf; *s != '\0' && !isspace(*s); s++);
			*s = '\0';
			printf("  %-10s %s\n", buf, cmd->desc);
		}
		return (CMDRTN_OK);
	default:
		/* Show help on a specific command */
		if ((cmd = FindCommand(av[1])) != NULL) {
			printf("usage:    %s\n", cmd->cmd);
			if (cmd->aliases[0] != NULL) {
				int a = 0;

				printf("Aliases:  ");
				while (1) {
					printf("%s", cmd->aliases[a++]);
					if (a == MAX_CMD_ALIAS
					    || cmd->aliases[a] == NULL) {
						printf("\n");
						break;
					}
					printf(", ");
				}
			}
			printf("Summary:  %s\n", cmd->desc);
			if (cmd->help != NULL) {
				const char *s;
				char buf[65];
				int tot, len, done;

				printf("Description:\n");
				for (s = cmd->help; *s != '\0'; s += len) {
					while (isspace(*s))
						s++;
					tot = snprintf(buf,
					    sizeof(buf), "%s", s);
					len = strlen(buf);
					done = len == tot;
					if (!done) {
						while (len > 0
						    && !isspace(buf[len-1]))
							buf[--len] = '\0';
					}