Rework copyright notices

While at it, rename mystrtonum.[ch] to strtonum.[ch].

Makefile

@@ -1,6 +1,6 @@
 # otpcli - command-line interface for HOTP and TOTP
 #
-# Written in 2020 by Lucas
+# Written in 2020-2021 by Lucas
 #
 # To the extent possible under law, the author(s) have dedicated all
 # copyright and related and neighboring rights to this software to the
@@ -17,18 +17,16 @@
 P =	otpcli
 V =	0.0
 
-HDR =		err.h mystrtonum.h otp.h
-OBJ =		cli.o err.o mystrtonum.o otp.o
-SRC =		${OBJ:.o=.c}
-DIST_FILES =	COPYING Makefile ${HDR} ${SRC}
+HDR =	err.h strtonum.h otp.h
+OBJ =	cli.o ${HDR:.h=.o}
+SRC =	${OBJ:.o=.c}
+
+LIBS =	-lcrypto
+
+DIST =	COPYING Makefile ${HDR} ${SRC}
 
 all: otpcli
 
-${OBJ}: ${HDR}
-
-otpcli: ${OBJ}
-	${CC} ${LDFLAGS} -o $@ ${OBJ} -lcrypto
-
 clean:
 	rm -f otpcli ${OBJ} ${P}-${V}.tgz
 
@@ -36,12 +34,16 @@ test: all run-tests.sh
 	sh ./run-tests.sh
 
 dist: clean
-	pax -w -s '#^#${P}-${V}/#' ${DIST_FILES} | gzip >${P}-${V}.tgz
+	pax -w -s ',^,$P-$V/,' ${DIST} | gzip >$P-$V.tgz
 
 install: all
 	mkdir -p ${PREFIX}/bin
 	cp -f ${BIN} ${PREFIX}/bin
-	cd ${PREFIX}/bin && chmod 555 ${BIN}
 
 uninstall:
 	cd ${PREFIX}/bin && rm -f ${BIN}
+
+${OBJ}: ${HDR}
+
+otpcli: ${OBJ}
+	${CC} ${LDFLAGS} -o $@ ${OBJ} ${LIBS}

cli.c

@@ -1,7 +1,7 @@
 /*
  * otpcli - CLI utility for generating OTPs
  *
- * Written in 2020 by Lucas
+ * Written in 2020-2021 by Lucas
  *
  * To the extent possible under law, the author(s) have dedicated all
  * copyright and related and neighboring rights to this software to the
@@ -23,7 +23,7 @@
 #include <unistd.h>
 
 #include "err.h"
-#include "mystrtonum.h"
+#include "strtonum.h"
 #include "otp.h"
 
 #define LINE_SIZE 16384
@@ -60,12 +60,12 @@ main(int argc, char *argv[])
 	while ((ch = getopt(argc, argv, "d:H:h:s:T:")) != -1) {
 		switch (ch) {
 		case 'd':
-			digits = mystrtonum(optarg, 6, 10, &errstr);
+			digits = strtonum(optarg, 6, 10, &errstr);
 			if (errstr != NULL)
 				errx(1, "digits is %s: %s", errstr, optarg);
 			break;
 		case 'H':
-			counter = mystrtonum(optarg, 0, LLONG_MAX, &errstr);
+			counter = strtonum(optarg, 0, LLONG_MAX, &errstr);
 			if (errstr != NULL)
 				errx(1, "counter is %s: %s", errstr, optarg);
 			do_hotp = 1;
@@ -81,12 +81,12 @@ main(int argc, char *argv[])
 				usage();
 			break;
 		case 's':
-			step = mystrtonum(optarg, 1, UINT_MAX, &errstr);
+			step = strtonum(optarg, 1, UINT_MAX, &errstr);
 			if (errstr != NULL)
 				errx(1, "step is %s: %s", errstr, optarg);
 			break;
 		case 'T':
-			counter = mystrtonum(optarg, 0, LLONG_MAX, &errstr);
+			counter = strtonum(optarg, 0, LLONG_MAX, &errstr);
 			if (errstr != NULL)
 				errx(1, "counter is %s: %s", errstr, optarg);
 			do_totp = 1;

err.c

@@ -1,16 +1,31 @@
-/*
- * libutil - C utility functions
+/*	$OpenBSD: verr.c,v 1.11 2016/03/13 18:34:20 guenther Exp $ */
+/*-
+ * Copyright (c) 1993
+ *	The Regents of the University of California.  All rights reserved.
  *
- * Written in 2020 by Lucas
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
  *
- * To the extent possible under law, the author(s) have dedicated all
- * copyright and related and neighboring rights to this software to the
- * public domain worldwide. This software is distributed without any
- * warranty.
- *
- * You should have received a copy of the CC0 Public Domain Dedication
- * along with this software. If not, see
- * <http://creativecommons.org/publicdomain/zero/1.0/>.
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
  */
 /*
  * Inspired by OpenBSD's `err.h' header, found at

err.h

@@ -1,18 +1,3 @@
-/*
- * libutil - C utility functions
- *
- * Written in 2020 by Lucas
- *
- * To the extent possible under law, the author(s) have dedicated all
- * copyright and related and neighboring rights to this software to the
- * public domain worldwide. This software is distributed without any
- * warranty.
- *
- * You should have received a copy of the CC0 Public Domain Dedication
- * along with this software. If not, see
- * <http://creativecommons.org/publicdomain/zero/1.0/>.
- */
-
 void err(int, const char *, ...);
 void errx(int, const char *, ...);
 void warn(const char *, ...);

mystrtonum.h

@@ -1,16 +0,0 @@
-/*
- * libutil - C utility functions
- *
- * Written in 2020 by Lucas
- *
- * To the extent possible under law, the author(s) have dedicated all
- * copyright and related and neighboring rights to this software to the
- * public domain worldwide. This software is distributed without any
- * warranty.
- *
- * You should have received a copy of the CC0 Public Domain Dedication
- * along with this software. If not, see
- * <http://creativecommons.org/publicdomain/zero/1.0/>.
- */
-
-long long mystrtonum(const char *, long long, long long, const char **);

strtonum.c

@@ -1,5 +1,3 @@
-/* This is OpenBSD's strtonum(3), renamed to mystrtonum */
-
 /*	$OpenBSD: strtonum.c,v 1.8 2015/09/13 08:31:48 guenther Exp $	*/
 
 /*
@@ -28,7 +26,7 @@
 #define	TOOLARGE	3
 
 long long
-mystrtonum(const char *numstr, long long minval, long long maxval,
+strtonum(const char *numstr, long long minval, long long maxval,
     const char **errstrp)
 {
 	long long ll = 0;

strtonum.h

@@ -0,0 +1 @@
+long long mystrtonum(const char *, long long, long long, const char **);