/*
 * Copyright (c) 2023 DTB <trinity@trinity.moe>
 * SPDX-License-Identifier: AGPL-3.0-or-later
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see https://www.gnu.org/licenses/.
 */

#include <ctype.h>
#include <stddef.h> /* NULL */
#include <stdio.h> /* fprintf(3) */
#include <string.h> /* strcmp(3) */
#if !defined EX_USAGE
#	include <sysexits.h>
#endif

static char *program_name = "str";

static struct {
	char *name;
	int (*f)(int);
}ctypes[] = {
	{ "isalnum", isalnum },
	{ "isalpha", isalpha },
	{ "isblank", isblank },
	{ "iscntrl", iscntrl },
	{ "isdigit", isdigit },
	{ "isxdigit", isxdigit },
	{ "isgraph", isgraph },
	{ "islower", islower },
	{ "isprint", isprint },
	{ "ispunct", ispunct },
	{ "isspace", isspace },
	{ "isupper", isupper }
};

int main(int argc, char *argv[]){
	int ctype;
	int i;
	int r;

	if(argc >= 3){
		for(ctype = 0; ctype < (sizeof ctypes) / (sizeof *ctypes);
				++ctype)
			if(strcmp(argv[1], ctypes[ctype].name) == 0)
				goto pass;
	}

	fprintf(stderr, "Usage: %s [type] [string...]\n",
		argv[0] == NULL ? program_name : argv[0]);

	return EX_USAGE;

pass:	for(argv += 2, r = 1; *argv != NULL; ++argv)
		for(i = 0; argv[0][i] != '\0'; ++i)
			/* First checks if argv[0][i] is valid ASCII; ctypes(3)
			 * don't handle non-ASCII.
			 * This is bad. */
			if(argv[0][i] < 0x80 && !ctypes[ctype].f(argv[0][i]))
				return 1;
			else
				r = 0;

	return r;
}