--- /dev/null
+.\" $NetBSD: number.6,v 1.7 2003/08/07 09:37:30 agc Exp $
+.\"
+.\" Copyright (c) 1989, 1993, 1994
+.\" The Regents of the University of California. All rights reserved.
+.\"
+.\" 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.
+.\"
+.\" 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.
+.\"
+.\" @(#)number.6 8.2 (Berkeley) 3/31/94
+.\"
+.Dd March 31, 1994
+.Dt NUMBER 6
+.Os
+.Sh NAME
+.Nm number
+.Nd convert Arabic numerals to English
+.Sh SYNOPSIS
+.Nm
+.Op Fl l
+.Op Ar number ...
+.Sh DESCRIPTION
+The
+.Nm
+utility prints the English equivalent of the number to the standard
+output, with each 10^3 magnitude displayed on a separate line.
+If no argument is specified,
+.Nm
+reads lines from the standard input.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl l
+Display the number on a single line.
+.El
+.Sh BUGS
+Although
+.Nm
+understand fractions, it doesn't understand exponents.
--- /dev/null
+/* $NetBSD: number.c,v 1.15 2012/06/19 05:46:09 dholland Exp $ */
+
+/*
+ * Copyright (c) 1988, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\
+ The Regents of the University of California. All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)number.c 8.3 (Berkeley) 5/4/95";
+#else
+__RCSID("$NetBSD: number.c,v 1.15 2012/06/19 05:46:09 dholland Exp $");
+#endif
+#endif /* not lint */
+
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define MAXNUM 65 /* Biggest number we handle. */
+
+static const char *const name1[] = {
+ "", "one", "two", "three",
+ "four", "five", "six", "seven",
+ "eight", "nine", "ten", "eleven",
+ "twelve", "thirteen", "fourteen", "fifteen",
+ "sixteen", "seventeen", "eighteen", "nineteen",
+},
+ *const name2[] = {
+ "", "ten", "twenty", "thirty",
+ "forty", "fifty", "sixty", "seventy",
+ "eighty", "ninety",
+},
+ *const name3[] = {
+ "hundred", "thousand", "million", "billion",
+ "trillion", "quadrillion", "quintillion", "sextillion",
+ "septillion", "octillion", "nonillion", "decillion",
+ "undecillion", "duodecillion", "tredecillion", "quattuordecillion",
+ "quindecillion", "sexdecillion",
+ "septendecillion", "octodecillion",
+ "novemdecillion", "vigintillion",
+};
+
+int main(int, char *[]);
+static void convert(char *);
+static int number(const char *, int);
+static void pfract(int);
+static int unit(int, const char *);
+static void usage(void) __dead;
+
+static int lflag;
+
+int
+main(int argc, char *argv[])
+{
+ int ch, first;
+ char line[256];
+
+ lflag = 0;
+ while ((ch = getopt(argc, argv, "l")) != -1)
+ switch (ch) {
+ case 'l':
+ lflag = 1;
+ break;
+ case '?':
+ default:
+ usage();
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (*argv == NULL)
+ for (first = 1;
+ fgets(line, sizeof(line), stdin) != NULL; first = 0) {
+ if (strchr(line, '\n') == NULL)
+ errx(1, "line too long.");
+ if (!first)
+ (void)printf("...\n");
+ convert(line);
+ }
+ else
+ for (first = 1; *argv != NULL; first = 0, ++argv) {
+ if (!first)
+ (void)printf("...\n");
+ convert(*argv);
+ }
+ exit(0);
+}
+
+void
+convert(char *line)
+{
+ int flen, len, rval;
+ char *p, *fraction;
+
+ flen = 0;
+ fraction = NULL;
+ for (p = line; *p != '\0' && *p != '\n'; ++p) {
+ if (isblank((unsigned char)*p)) {
+ if (p == line) {
+ ++line;
+ continue;
+ }
+ goto badnum;
+ }
+ if (isdigit((unsigned char)*p))
+ continue;
+ switch (*p) {
+ case '.':
+ if (fraction != NULL)
+ goto badnum;
+ fraction = p + 1;
+ *p = '\0';
+ break;
+ case '-':
+ if (p == line)
+ break;
+ /* FALLTHROUGH */
+ default:
+badnum: errx(1, "illegal number: %s", line);
+ break;
+ }
+ }
+ *p = '\0';
+
+ if ((len = strlen(line)) > MAXNUM ||
+ (fraction != NULL && (flen = strlen(fraction)) > MAXNUM))
+ errx(1, "number too large, max %d digits.", MAXNUM);
+
+ if (*line == '-') {
+ (void)printf("minus%s", lflag ? " " : "\n");
+ ++line;
+ --len;
+ }
+
+ rval = len > 0 ? unit(len, line) : 0;
+ if (fraction != NULL && flen != 0)
+ for (p = fraction; *p != '\0'; ++p)
+ if (*p != '0') {
+ if (rval)
+ (void)printf("%sand%s",
+ lflag ? " " : "",
+ lflag ? " " : "\n");
+ if (unit(flen, fraction)) {
+ if (lflag)
+ (void)printf(" ");
+ pfract(flen);
+ rval = 1;
+ }
+ break;
+ }
+ if (!rval)
+ (void)printf("zero%s", lflag ? "" : ".\n");
+ if (lflag)
+ (void)printf("\n");
+}
+
+int
+unit(int len, const char *p)
+{
+ int off, rval;
+
+ rval = 0;
+ if (len > 3) {
+ if (len % 3) {
+ off = len % 3;
+ len -= off;
+ if (number(p, off)) {
+ rval = 1;
+ (void)printf(" %s%s",
+ name3[len / 3], lflag ? " " : ".\n");
+ }
+ p += off;
+ }
+ for (; len > 3; p += 3) {
+ len -= 3;
+ if (number(p, 3)) {
+ rval = 1;
+ (void)printf(" %s%s",
+ name3[len / 3], lflag ? " " : ".\n");
+ }
+ }
+ }
+ if (number(p, len)) {
+ if (!lflag)
+ (void)printf(".\n");
+ rval = 1;
+ }
+ return (rval);
+}
+
+int
+number(const char *p, int len)
+{
+ int val, rval;
+
+ rval = 0;
+ switch (len) {
+ case 3:
+ if (*p != '0') {
+ rval = 1;
+ (void)printf("%s hundred", name1[*p - '0']);
+ }
+ ++p;
+ /* FALLTHROUGH */
+ case 2:
+ val = (p[1] - '0') + (p[0] - '0') * 10;
+ if (val) {
+ if (rval)
+ (void)printf(" ");
+ if (val < 20)
+ (void)printf("%s", name1[val]);
+ else {
+ (void)printf("%s", name2[val / 10]);
+ if (val % 10)
+ (void)printf("-%s", name1[val % 10]);
+ }
+ rval = 1;
+ }
+ break;
+ case 1:
+ if (*p != '0') {
+ rval = 1;
+ (void)printf("%s", name1[*p - '0']);
+ }
+ }
+ return (rval);
+}
+
+void
+pfract(int len)
+{
+ static const char *const pref[] = { "", "ten-", "hundred-" };
+
+ switch(len) {
+ case 1:
+ (void)printf("tenths.\n");
+ break;
+ case 2:
+ (void)printf("hundredths.\n");
+ break;
+ default:
+ (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
+ break;
+ }
+}
+
+void
+usage(void)
+{
+ (void)fprintf(stderr, "usage: number [# ...]\n");
+ exit(1);
+}