static error_t parse_arg()

in profiler/profile.cpp [101:216]

• 115 lines of code
• 31 McCabe index (conditional complexity)

static error_t parse_arg(int key, char *arg, struct argp_state *state)
{
	static int pos_args;

	switch (key)
	{
	case 'h':
		argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
		break;
	case 'v':
		env.verbose = true;
		break;
	case 'p':
		errno = 0;
		env.pid = strtol(arg, NULL, 10);
		if (errno)
		{
			fprintf(stderr, "invalid PID: %s\n", arg);
			argp_usage(state);
		}
		break;
	case 'L':
		errno = 0;
		env.tid = strtol(arg, NULL, 10);
		if (errno || env.tid <= 0)
		{
			fprintf(stderr, "Invalid TID: %s\n", arg);
			argp_usage(state);
		}
		break;
	case 'U':
		env.user_stacks_only = true;
		break;
	case 'K':
		env.kernel_stacks_only = true;
		break;
	case 'F':
		errno = 0;
		env.sample_freq = strtol(arg, NULL, 10);
		if (errno || env.sample_freq <= 0)
		{
			fprintf(stderr, "invalid FREQUENCY: %s\n", arg);
			argp_usage(state);
		}
		break;
	case 'D':
		errno = 0;
		env.frame_depth = strtol(arg, NULL, 10);
		if (errno || env.frame_depth <= 0)
		{
			fprintf(stderr, "invalid FREQUENCY: %s\n", arg);
			argp_usage(state);
		}
		break;
	case 'd':
		env.delimiter = true;
		break;
	case 'I':
		env.include_idle = true;
		break;
	case 'f':
		env.folded = true;
		break;
	case 'C':
		errno = 0;
		env.cpu = strtol(arg, NULL, 10);
		if (errno)
		{
			fprintf(stderr, "invalid CPU: %s\n", arg);
			argp_usage(state);
		}
		break;
	case OPT_PERF_MAX_STACK_DEPTH:
		errno = 0;
		env.perf_max_stack_depth = strtol(arg, NULL, 10);
		if (errno)
		{
			fprintf(stderr, "invalid perf max stack depth: %s\n", arg);
			argp_usage(state);
		}
		break;
	case OPT_STACK_STORAGE_SIZE:
		errno = 0;
		env.stack_storage_size = strtol(arg, NULL, 10);
		if (errno)
		{
			fprintf(stderr, "invalid stack storage size: %s\n", arg);
			argp_usage(state);
		}
		break;
	case OPT_LUA_USER_STACK_ONLY:
		env.lua_user_stacks_only = true;
		break;
	case OPT_DISABLE_LUA_USER_TRACE:
		env.disable_lua_user_trace = true;
		break;
	case ARGP_KEY_ARG:
		if (pos_args++)
		{
			fprintf(stderr,
					"Unrecognized positional argument: %s\n", arg);
			argp_usage(state);
		}
		errno = 0;
		env.duration = strtol(arg, NULL, 10);
		if (errno || env.duration <= 0)
		{
			fprintf(stderr, "Invalid duration (in s): %s\n", arg);
			argp_usage(state);
		}
		break;
	default:
		return ARGP_ERR_UNKNOWN;
	}
	return 0;
}