change default server

Follow-up fix on commit df4c061136

"
While it is true reversing the condition solves a single-byte read at
one before s, there is a second instance of UB.

Having a pointer to one before an object is in of itself UB in C, it's
on the side of language lawyering, but it's UB.
I add here a quote from a C standard draft:
> When an expression that has integer type is added to or subtracted
> from a pointer, the result has the type of the pointer operand.
> If both the pointer operand and the result point to elements of the
> same array object, or one past the last element of the array object,
> the evaluation shall not produce an overflow; otherwise, the
> behavior is undefined.
Taken from: http://www.iso-9899.info/n1570.html#6.5.6p8
"

Thanks Guilherme Janczak <guilherme.janczak@yandex.com>

.editorconfig

@@ -0,0 +1,21 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{*.c,*.h}]
+indent_style = tab
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false
+indent_style = tab
+
+[Makefile]
+indent_style = tab
+indent_size = 4

.hgtags

@@ -1,11 +0,0 @@
-de32c537aaf66554894712563ffba8d9bc4c2714 0.1
-56350a01f27753cfbdbb3dbc25f2a53dd4c2ac45 0.2
-d77f00af559258679a0fad5d264685d663e6975a 0.3
-a3549fb4c72ff0edb816c8c29be7ff289db5b003 0.4
-70d49a37b35695f2f771bddaf309f05ea60af8bc 0.5
-d7923d9e717c1c6f1ed3b17ec90bfdd7e7bfcca0 0.6
-643a6e8b8634b70d2459637fcfff6eca776fc919 0.7
-07fb3efaa2e9ed18c6c16f0ddd8576cb66fec9c6 0.8
-96eb1bfede5b72fcee3f515d3113d814f7e87108 0.9
-b8794f3ed15e34b24ff9fb11c93a4405d0f91433 1.0
-d6140e3685b89c609a731471eba6787f7869aa59 1.1

LICENSE

@@ -1,6 +1,7 @@
 MIT/X Consortium License
 
-© 2005-2013 Anselm R Garbe <anselm@garbe.us>
+© 2022 Alexander Popov <iiiypuk@fastmail.fm>
+© 2005-2017 Anselm R Garbe <anselm@garbe.us>
 © 2008-2009 Jeroen Schot <schot@a-eskwadraat.nl>
 © 2007-2009 Kris Maglione <maglione.k@gmail.com>
 © 2005 Nico Golde <nico at ngolde dot de>

Makefile

@@ -1,54 +1,59 @@
-# sic - simple irc client
+.POSIX:
 
-include config.mk
+NAME = sic
+VERSION = 1.3
 
-SRC = sic.c
+# paths
+PREFIX = /usr/local
+MANPREFIX = ${PREFIX}/share/man
+
+# use system flags.
+SIC_CFLAGS = ${CFLAGS}
+SIC_LDFLAGS = ${LDFLAGS}
+SIC_CPPFLAGS = ${LDFLAGS} -DVERSION=\"${VERSION}\" -D_GNU_SOURCE
+
+BIN = sic
+SRC = ${BIN:=.c}
 OBJ = ${SRC:.c=.o}
+MAN1 = ${BIN:=.1}
 
-all: options sic
+all: ${BIN}
 
-options:
-	@echo sic build options:
-	@echo "CFLAGS   = ${CFLAGS}"
-	@echo "LDFLAGS  = ${LDFLAGS}"
-	@echo "CC       = ${CC}"
+${BIN}: ${@:=.o}
+
+${OBJ}: config.h strlcpy.c util.c
+
+.o:
+	${CC} -o $@ $< ${SIC_LDFLAGS}
 
 .c.o:
-	@echo CC $<
-	@${CC} -c ${CFLAGS} $<
+	${CC} -c ${SIC_CFLAGS} ${SIC_CPPFLAGS} -o $@ -c $<
 
-${OBJ}: config.mk util.c
-
-sic: ${OBJ}
-	@echo CC -o $@
-	@${CC} -o $@ ${OBJ} ${LDFLAGS}
+config.h:
+	cp config.def.h $@
 
 clean:
-	@echo cleaning
-	@rm -f sic ${OBJ} sic-${VERSION}.tar.gz
+	rm -f ${BIN} ${OBJ} "${NAME}-${VERSION}.tar.gz"
 
-dist: clean
-	@echo creating dist tarball
-	@mkdir -p sic-${VERSION}
-	@cp -R LICENSE Makefile README config.mk sic.1 sic.c util.c sic-${VERSION}
-	@tar -cf sic-${VERSION}.tar sic-${VERSION}
-	@gzip sic-${VERSION}.tar
-	@rm -rf sic-${VERSION}
+dist:
+	mkdir -p "${NAME}-${VERSION}"
+	cp -fR LICENSE Makefile README arg.h config.def.h \
+		${MAN1} ${SRC} util.c strlcpy.c "${NAME}-${VERSION}"
+	tar -cf - "${NAME}-${VERSION}" | \
+		gzip -c > "${NAME}-${VERSION}.tar.gz"
+	rm -rf "${NAME}-${VERSION}"
 
 install: all
-	@echo installing executable file to ${DESTDIR}${PREFIX}/bin
-	@mkdir -p ${DESTDIR}${PREFIX}/bin
-	@cp -f sic ${DESTDIR}${PREFIX}/bin
-	@chmod 755 ${DESTDIR}${PREFIX}/bin/sic
-	@echo installing manual page to ${DESTDIR}${MANPREFIX}/man1
-	@mkdir -p ${DESTDIR}${MANPREFIX}/man1
-	@sed "s/VERSION/${VERSION}/g" < sic.1 > ${DESTDIR}${MANPREFIX}/man1/sic.1
-	@chmod 644 ${DESTDIR}${MANPREFIX}/man1/sic.1
+	mkdir -p ${DESTDIR}${PREFIX}/bin
+	cp -f ${BIN} "${DESTDIR}${PREFIX}/bin"
+	chmod 755 "${DESTDIR}${PREFIX}/bin/${BIN}"
+	mkdir -p "${DESTDIR}${MANPREFIX}/man1"
+	sed "s/VERSION/${VERSION}/g" < ${MAN1} > "${DESTDIR}${MANPREFIX}/man1/${MAN1}"
+	chmod 644 "${DESTDIR}${MANPREFIX}/man1/${MAN1}"
 
 uninstall:
-	@echo removing executable file from ${DESTDIR}${PREFIX}/bin
-	@rm -f ${DESTDIR}${PREFIX}/bin/sic
-	@echo removing manual page from ${DESTDIR}${MANPREFIX}/man1
-	@rm -f ${DESTDIR}${MANPREFIX}/man1/sic.1
+	rm -f \
+		"${DESTDIR}${PREFIX}/bin/${BIN}"\
+		"${DESTDIR}${MANPREFIX}/man1/${MAN1}"
 
-.PHONY: all options clean dist install uninstall
+.PHONY: all clean dist install uninstall

README

@@ -1,22 +0,0 @@
-sic - simple irc client
-=======================
-sic is an extremly fast, small and simple irc client.  It reads commands from
-standard input and prints all server output to standard output. It multiplexes
-also all channel traffic into one output, that you don't have to switch
-different channel buffers, that's actually a feature.
-
-
-Installation
-------------
-Edit config.mk to match your local setup. sic is installed into
-/usr/local by default.
-
-Afterwards enter the following command to build and install sic 
-(if necessary as root):
-
-    $ make clean install
-
-
-Running sic
------------
-Simply invoke the 'sic' command with the required arguments.

README.md

@@ -0,0 +1,23 @@
+sic - simple irc client
+=======================
+sic is an extremely fast, small and simple irc client.  It reads commands from
+standard input and prints all server output to standard output. It multiplexes
+also all channel traffic into one output so that you don't have to switch
+different channel buffers: that's actually a feature.
+
+
+Installation
+------------
+Edit the Makefile or override the flags to match your local setup. sic is
+installed into /usr/local by default.
+
+Afterwards enter the following command to build and install sic 
+(if necessary as root):
+
+	$ make
+	# make install
+
+
+Running sic
+-----------
+Simply invoke the `sic` command with the required arguments.

arg.h

@@ -0,0 +1,63 @@
+/*
+ * Copy me if you can.
+ * by 20h
+ */
+
+#ifndef ARG_H__
+#define ARG_H__
+
+extern char *argv0;
+
+/* use main(int argc, char *argv[]) */
+#define ARGBEGIN	for (argv0 = *argv, argv++, argc--;\
+					argv[0] && argv[0][1]\
+					&& argv[0][0] == '-';\
+					argc--, argv++) {\
+				char argc_;\
+				char **argv_;\
+				int brk_;\
+				if (argv[0][1] == '-' && argv[0][2] == '\0') {\
+					argv++;\
+					argc--;\
+					break;\
+				}\
+				for (brk_ = 0, argv[0]++, argv_ = argv;\
+						argv[0][0] && !brk_;\
+						argv[0]++) {\
+					if (argv_ != argv)\
+						break;\
+					argc_ = argv[0][0];\
+					switch (argc_)
+
+/* Handles obsolete -NUM syntax */
+#define ARGNUM				case '0':\
+					case '1':\
+					case '2':\
+					case '3':\
+					case '4':\
+					case '5':\
+					case '6':\
+					case '7':\
+					case '8':\
+					case '9'
+
+#define ARGEND			}\
+			}
+
+#define ARGC()		argc_
+
+#define ARGNUMF(base)	(brk_ = 1, estrtol(argv[0], (base)))
+
+#define EARGF(x)	((argv[0][1] == '\0' && argv[1] == NULL)?\
+				((x), abort(), (char *)0) :\
+				(brk_ = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#define ARGF()		((argv[0][1] == '\0' && argv[1] == NULL)?\
+				(char *)0 :\
+				(brk_ = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#endif

config.def.h

@@ -0,0 +1,14 @@
+/* Host used when "-h" is not given */
+#define DEFAULT_HOST "iiiypuk.me"
+
+/* Port used when "-p" is not given */
+#define DEFAULT_PORT "6667"
+
+/* Timestamp format; see strftime(3). */
+#define TIMESTAMP_FORMAT "%Y-%m-%d %R"
+
+/* Command prefix character. In most IRC clients this is '/'. */
+#define COMMAND_PREFIX_CHARACTER ':'
+
+/* Parting message used when none is specified with ":l ..." command. */
+#define DEFAULT_PARTING_MESSAGE "sic - 250 LOC are too much!"

config.mk

@@ -1,20 +0,0 @@
-# sic version
-VERSION = 1.2
-
-# Customize below to fit your system
-
-# paths
-PREFIX = /usr/local
-MANPREFIX = ${PREFIX}/share/man
-
-# includes and libs
-INCS = -I. -I/usr/include
-LIBS = -L/usr/lib -lc
-
-# flags
-CPPFLAGS = -DVERSION=\"${VERSION}\" -D_GNU_SOURCE
-CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
-LDFLAGS = -s ${LIBS}
-
-# compiler and linker
-CC = cc

sic.c

@@ -1,4 +1,6 @@
- /* See LICENSE file for license details. */
+/* See LICENSE file for license details. */
+#include <sys/select.h>
+
 #include <ctype.h>
 #include <errno.h>
 #include <stdarg.h>
@@ -8,8 +10,12 @@
 #include <time.h>
 #include <unistd.h>
 
-static char *host = "irc.oftc.net";
-static char *port = "6667";
+#include "arg.h"
+#include "config.h"
+
+char *argv0;
+static char *host = DEFAULT_HOST;
+static char *port = DEFAULT_PORT;
 static char *password;
 static char nick[32];
 static char bufin[4096];
@@ -18,11 +24,13 @@ static char channel[256];
 static time_t trespond;
 static FILE *srv;
 
+#undef strlcpy
+#include "strlcpy.c"
 #include "util.c"
 
 static void
 pout(char *channel, char *fmt, ...) {
-	static char timestr[18];
+	static char timestr[80];
 	time_t t;
 	va_list ap;
 
@@ -30,7 +38,7 @@ pout(char *channel, char *fmt, ...) {
 	vsnprintf(bufout, sizeof bufout, fmt, ap);
 	va_end(ap);
 	t = time(NULL);
-	strftime(timestr, sizeof timestr, "%D %R", localtime(&t));
+	strftime(timestr, sizeof timestr, TIMESTAMP_FORMAT, localtime(&t));
 	fprintf(stdout, "%-12s: %s %s\n", channel, timestr, bufout);
 }
 
@@ -61,12 +69,12 @@ parsein(char *s) {
 	if(s[0] == '\0')
 		return;
 	skip(s, '\n');
-	if(s[0] != ':') {
+	if(s[0] != COMMAND_PREFIX_CHARACTER) {
 		privmsg(channel, s);
 		return;
 	}
 	c = *++s;
-	if(c != '\0' && isspace(s[1])) {
+	if(c != '\0' && isspace((unsigned char)s[1])) {
 		p = s + 2;
 		switch(c) {
 		case 'j':
@@ -82,7 +90,7 @@ parsein(char *s) {
 			if(*p)
 				*p++ = '\0';
 			if(!*p)
-				p = "sic - 250 LOC are too much!";
+				p = DEFAULT_PARTING_MESSAGE;
 			sout("PART %s :%s", s, p);
 			return;
 		case 'm':
@@ -131,40 +139,44 @@ parsesrv(char *cmd) {
 	}
 }
 
+
+static void
+usage(void) {
+	eprint("usage: sic [-h host] [-p port] [-n nick] [-k keyword] [-v]\n", argv0);
+}
+
 int
 main(int argc, char *argv[]) {
-	int i, c;
 	struct timeval tv;
 	const char *user = getenv("USER");
+	int n;
 	fd_set rd;
 
 	strlcpy(nick, user ? user : "unknown", sizeof nick);
-	for(i = 1; i < argc; i++) {
-		c = argv[i][1];
-		if(argv[i][0] != '-' || argv[i][2])
-			c = -1;
-		switch(c) {
-		case 'h':
-			if(++i < argc) host = argv[i];
-			break;
-		case 'p':
-			if(++i < argc) port = argv[i];
-			break;
-		case 'n':
-			if(++i < argc) strlcpy(nick, argv[i], sizeof nick);
-			break;
-		case 'k':
-			if(++i < argc) password = argv[i];
-			break;
-		case 'v':
-			eprint("sic-"VERSION", © 2005-2012 Kris Maglione, Anselm R. Garbe, Nico Golde\n");
-		default:
-			eprint("usage: sic [-h host] [-p port] [-n nick] [-k keyword] [-v]\n");
-		}
-	}
+	ARGBEGIN {
+	case 'h':
+		host = EARGF(usage());
+		break;
+	case 'p':
+		port = EARGF(usage());
+		break;
+	case 'n':
+		strlcpy(nick, EARGF(usage()), sizeof nick);
+		break;
+	case 'k':
+		password = EARGF(usage());
+		break;
+	case 'v':
+		eprint("sic-"VERSION", © 2005-2017 Anselm R Garbe, Jeroen Schot, Kris Maglione, Nico Golde\n");
+		break;
+	default:
+		usage();
+	} ARGEND;
+
 	/* init */
-	i = dial(host, port);
-	srv = fdopen(i, "r+");
+	srv = fdopen(dial(host, port), "r+");
+	if (!srv)
+		eprint("fdopen:");
 	/* login */
 	if(password)
 		sout("PASS %s", password);
@@ -173,19 +185,24 @@ main(int argc, char *argv[]) {
 	fflush(srv);
 	setbuf(stdout, NULL);
 	setbuf(srv, NULL);
+	setbuf(stdin, NULL);
+#ifdef __OpenBSD__
+	if (pledge("stdio", NULL) == -1)
+		eprint("error: pledge:");
+#endif
 	for(;;) { /* main loop */
 		FD_ZERO(&rd);
 		FD_SET(0, &rd);
 		FD_SET(fileno(srv), &rd);
 		tv.tv_sec = 120;
 		tv.tv_usec = 0;
-		i = select(fileno(srv) + 1, &rd, 0, 0, &tv);
-		if(i < 0) {
+		n = select(fileno(srv) + 1, &rd, 0, 0, &tv);
+		if(n < 0) {
 			if(errno == EINTR)
 				continue;
 			eprint("sic: error on select():");
 		}
-		else if(i == 0) {
+		else if(n == 0) {
 			if(time(NULL) - trespond >= 300)
 				eprint("sic shutting down: parse timeout\n");
 			sout("PING %s", host);

strlcpy.c

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <string.h>
+#include <sys/types.h>
+
+/*
+ * Copy src to string dst of size siz. At most siz-1 characters
+ * will be copied. Always NUL terminates (unless siz == 0).
+ * Returns strlen(src); if retval >= siz, truncation occurred.
+ */
+size_t
+strlcpy(char *dst, const char *src, size_t siz)
+{
+	char *d = dst;
+	const char *s = src;
+	size_t n = siz;
+	/* Copy as many bytes as will fit */
+	if (n != 0) {
+		while (--n != 0) {
+			if ((*d++ = *s++) == '\0')
+				break;
+		}
+	}
+	/* Not enough room in dst, add NUL and traverse rest of src */
+	if (n == 0) {
+		if (siz != 0)
+			*d = '\0'; /* NUL-terminate dst */
+		while (*s++)
+			;
+	}
+	return(s - src - 1); /* count does not include NUL */
+}

util.c

@@ -18,9 +18,9 @@ eprint(const char *fmt, ...) {
 
 static int
 dial(char *host, char *port) {
-	static struct addrinfo hints;
-	int srv;
+	struct addrinfo hints;
 	struct addrinfo *res, *r;
+	int fd;
 
 	memset(&hints, 0, sizeof hints);
 	hints.ai_family = AF_UNSPEC;
@@ -28,28 +28,21 @@ dial(char *host, char *port) {
 	if(getaddrinfo(host, port, &hints, &res) != 0)
 		eprint("error: cannot resolve hostname '%s':", host);
 	for(r = res; r; r = r->ai_next) {
-		if((srv = socket(r->ai_family, r->ai_socktype, r->ai_protocol)) == -1)
+		if((fd = socket(r->ai_family, r->ai_socktype, r->ai_protocol)) == -1)
 			continue;
-		if(connect(srv, r->ai_addr, r->ai_addrlen) == 0)
+		if(connect(fd, r->ai_addr, r->ai_addrlen) == 0)
 			break;
-		close(srv);
+		close(fd);
 	}
 	freeaddrinfo(res);
 	if(!r)
 		eprint("error: cannot connect to host '%s'\n", host);
-	return srv;
-}
-
-#define strlcpy _strlcpy
-static void
-strlcpy(char *to, const char *from, int l) {
-	memccpy(to, from, '\0', l);
-	to[l-1] = '\0';
+	return fd;
 }
 
 static char *
 eat(char *s, int (*p)(int), int r) {
-	while(s != '\0' && p(*s) == r)
+	while(*s != '\0' && p((unsigned char)*s) == r)
 		s++;
 	return s;
 }
@@ -67,8 +60,7 @@ static void
 trim(char *s) {
 	char *e;
 
-	e = s + strlen(s) - 1;
-	while(isspace(*e) && e > s)
-		e--;
-	*(e + 1) = '\0';
+	for (e = s + strlen(s); e > s && isspace((unsigned char)*(e - 1)); e--)
+		;
+	*e = '\0';
 }