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/*
 * wc.c
 * Implementation of SUSv3 XCU wc utility
 * Copyright © 2007 Rich Felker
 * Licensed under the terms of the GNU General Public License, v2 or later
 */

#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include <wctype.h>
#include <locale.h>

static int my_mbrtowc(wchar_t *wc, int b, mbstate_t *st)
{
	char c = b;
	int retry = 1;
retry:
	switch ((int)mbrtowc(wc, &c, 1, st)) {
	case -2:
		return -2;
	case -1:
		memset(st, 0, sizeof(mbstate_t));
		if (retry--) goto retry;
		return retry; /* yes this is lame */
	}
	return 1;
}

int main(int argc, char *argv[])
{
	int b;
	int pc=0, pm=0, pw=0, pl=0;
	unsigned long long c, m, w, l;
	unsigned long long tc=0, tm=0, tw=0, tl=0;
	int sp;
	mbstate_t st;
	wchar_t wc;
	char *file;
	FILE *f;
	int err = 0;
	int totals = 0, noname = 0;

	setlocale(LC_CTYPE, "");

	while ((b = getopt(argc, argv, "cmwl")) != EOF) switch(b) {
	case 'c': pc=1; break;
	case 'm': pm=1; break;
	case 'w': pw=1; break;
	case 'l': pl=1; break;
	default: exit(1);
	}
	if (!(pc|pm|pw|pl)) pc=pw=pl=1;
	if (pc&pm) {
		fprintf(stderr, "%s: -c and -m are not valid together\n",
			argv[0]);
		exit(1);
	}
	if (optind == argc) {
		file = "(stdin)";
		f = stdin;
		noname = 1;
		goto use_stdin;
	} else if (argc-optind > 1) totals=1;
	for (; optind < argc; optind++) {
		file = argv[optind];
		f = fopen(file, "rb");
		if (!f) {
			fprintf(stderr, "%s: %s: ", argv[0], file);
			perror("");
			err = 1;
			continue;
		}
use_stdin:
		memset(&st, 0, sizeof st);
		for (sp=1, c=m=w=l=0; (b=getc(f)) >= 0; c++) {
			if ((pm|pw) && my_mbrtowc(&wc, b, &st) >= 0) {
				m++;
				if (iswspace(wc)) sp=1;
				else if (sp) sp=0, w++;
			}
			if (b == '\n') l++;
		}
		if (ferror(f)) {
			fprintf(stderr, "%s: %s: ", argv[0], file);
			perror("");
			err = 1;
		}
		tl += l; tw += w; tm += m; tc += c;
totals:
		if (pl) printf("%7llu", l);
		if (pl&pw) putchar(' ');
		if (pw) printf("%7llu", w);
		if ((pl|pw)&(pc|pm)) putchar(' ');
		if (pc|pm) printf("%7llu", pm?m:c);
		if (!noname) printf(" %s", file);
		putchar('\n');
		fclose(f);
	}
	if (totals) {
		l = tl;
		w = tw;
		m = tm;
		c = tc;
		file = "total";
		f = stdin;
		totals = 0;
		goto totals;
	}
	return err;
}