refactor(cli): replace runtime size vars with compile-time enum constants

Replace g_options_len and g_opt_str_len extern variables with
CLI_OPT_LEN and CLI_OPT_STR_LEN enum constants computed via X-macros.

Disables Variable Length Arrays (VLA) by enforcing the use of the -Wvla
flag in strict mode.

configure

@@ -512,7 +512,7 @@ generate_build_mk() {
 	
 	# Strict flags
 	if [ "$ENABLE_STRICT" = "yes" ]; then
-		strict_flags="-Wpedantic -Wconversion -Wshadow -Wcast-align -Wstrict-prototypes"
+		strict_flags="-Wpedantic -Wconversion -Wshadow -Wcast-align -Wstrict-prototypes -Wvla"
 	fi
 	
 	# libicmp-specific configuration

includes/cli.h

@@ -32,8 +32,6 @@ typedef struct s_option_descriptor
 }	t_option_descriptor;
 
 extern const t_option_descriptor	g_options[];
-extern const size_t					g_options_len;
-extern const size_t					g_opt_str_len;
 
 int	cli_handle_count(const char *arg, t_ping_config *config);
 int	cli_handle_flood(const char *arg, t_ping_config *config);

includes/cli_opt.h

@@ -83,12 +83,16 @@
 		"Flood mode" \
 	)
 
+#undef X
+#define X(short_opt, long_opt, has_arg, handler, arg_type, desc) + 1
+enum { CLI_OPT_LEN = (0 CLI_OPTIONS_LIST) };
+
+#include <getopt.h>
 #undef X
 #define X(short_opt, long_opt, has_arg, handler, arg_type, desc) \
 	+ (1 * (has_arg == no_argument) \
 	+ (2 * (has_arg == required_argument) \
 	+ (3 * (has_arg == optional_argument))))
-
+enum { CLI_OPT_STR_LEN = (0 CLI_OPTIONS_LIST) };
-#define CLI_OPT_STR_LEN (0 CLI_OPTIONS_LIST)
 
 #endif

src/cli/handlers/handle_help.c

@@ -3,6 +3,7 @@
 #include <getopt.h>
 
 #include "cli.h"
+#include "cli_opt.h"
 #include "ft_ping.h"
 
 /* Forward declarations */
@@ -19,7 +20,7 @@ cli_handle_help(const char *arg, t_ping_config *config)
 	printf("Usage: ft_ping [options] <destination>\n\n");
 	printf("Options:\n");
 
-	for (size_t i = 0; i < g_options_len; ++i)
+	for (size_t i = 0; i < CLI_OPT_LEN; ++i)
 	{
 		const t_option_descriptor *opt = &g_options[i];
 		const char *argstr = option_arg_type_to_str(opt->arg_type);

src/cli/handlers/handler_map.c

@@ -13,14 +13,4 @@ const t_option_descriptor g_options[] = {
 	{0, NULL, 0, NULL, OPT_ARG_NONE, NULL }
 };
 
-
-const size_t g_options_len = ((sizeof(g_options) / sizeof(*g_options)) - 1);
-
-#undef X
-#define X(short_opt, long_opt, has_arg, handler, arg_type, desc) \
-	+ (1 * (has_arg == no_argument) \
-	+ (2 * (has_arg == required_argument) \
-	+ (3 * (has_arg == optional_argument))))
-
-const size_t g_opt_str_len = CLI_OPT_STR_LEN;
 #undef X

src/cli/parse.c

@@ -3,6 +3,7 @@
 #include <getopt.h>
 
 #include "cli.h"
+#include "cli_opt.h"
 #include "ft_ping.h"
 #include "ft_ping_const.h"
 
@@ -17,13 +18,13 @@ static int handle_one_option(int opt, char *arg, t_ping_config *config);
 int
 cli_parse_arguments(int argc, char **argv, t_ping_config *config)
 {
-	struct option	long_opts[g_options_len + 1];
+	struct option	long_opts[CLI_OPT_LEN + 1];
-	const char *opt_str = "hVvq:c:i:t:s:W:f";
+	const char *opt_str = "hVvqc:i:t:s:W:f";
 	int opt;
 	int res;
 
 	init_config(config);
-	build_long_options(long_opts, g_options_len, g_options);
+	build_long_options(long_opts, CLI_OPT_LEN, g_options);
 	while (-1 != (opt = getopt_long(argc, argv, opt_str, long_opts, NULL)))
 	{
 		res = handle_one_option(opt, optarg, config);
@@ -77,7 +78,7 @@ build_long_options(struct option *long_opts, size_t nb_opts,
 static const t_option_descriptor
 *find_option_handler(int opt)
 {
-	for (size_t i = 0; i < g_options_len; ++i)
+	for (size_t i = 0; i < CLI_OPT_LEN; ++i)
 	{
 		if (g_options[i].short_opt == opt)
 			return &g_options[i];