number.c revision 53920 
1/*
2 * Copyright (c) 1988, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1988, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)number.c	8.3 (Berkeley) 5/4/95";
43#endif
44static const char rcsid[] =
45 "$FreeBSD: head/games/number/number.c 53920 1999-11-30 03:50:02Z billf $";
46#endif /* not lint */
47
48#include <sys/types.h>
49
50#include <ctype.h>
51#include <err.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56
57#define	MAXNUM		65		/* Biggest number we handle. */
58
59static char	*name1[] = {
60	"",		"one",		"two",		"three",
61	"four",		"five",		"six",		"seven",
62	"eight",	"nine",		"ten",		"eleven",
63	"twelve",	"thirteen",	"fourteen",	"fifteen",
64	"sixteen",	"seventeen",	"eighteen",	"nineteen",
65},
66		*name2[] = {
67	"",		"ten",		"twenty",	"thirty",
68	"forty",	"fifty",	"sixty",	"seventy",
69	"eighty",	"ninety",
70},
71		*name3[] = {
72	"hundred",	"thousand",	"million",	"billion",
73	"trillion",	"quadrillion",	"quintillion",	"sextillion",
74	"septillion",	"octillion",	"nonillion",	"decillion",
75	"undecillion",	"duodecillion",	"tredecillion",	"quattuordecillion",
76	"quindecillion",		"sexdecillion",
77	"septendecillion",		"octodecillion",
78	"novemdecillion",		"vigintillion",
79};
80
81void	convert __P((char *));
82int	number __P((char *, int));
83void	pfract __P((int));
84void	toobig __P((void));
85int	unit __P((int, char *));
86void	usage __P((void));
87
88int lflag;
89
90int
91main(argc, argv)
92	int argc;
93	char *argv[];
94{
95	int ch, first;
96	char line[256];
97
98	lflag = 0;
99	while ((ch = getopt(argc, argv, "l")) != -1)
100		switch (ch) {
101		case 'l':
102			lflag = 1;
103			break;
104		case '?':
105		default:
106			usage();
107		}
108	argc -= optind;
109	argv += optind;
110
111	if (*argv == NULL)
112		for (first = 1;
113		    fgets(line, sizeof(line), stdin) != NULL; first = 0) {
114			if (strchr(line, '\n') == NULL)
115				errx(1, "line too long.");
116			if (!first)
117				(void)printf("...\n");
118			convert(line);
119		}
120	else
121		for (first = 1; *argv != NULL; first = 0, ++argv) {
122			if (!first)
123				(void)printf("...\n");
124			convert(*argv);
125		}
126	exit(0);
127}
128
129void
130convert(line)
131	char *line;
132{
133	int flen, len, rval;
134	char *p, *fraction;
135
136	fraction = NULL;
137	for (p = line; *p != '\0' && *p != '\n'; ++p) {
138		if (isblank(*p)) {
139			if (p == line) {
140				++line;
141				continue;
142			}
143			goto badnum;
144		}
145		if (isdigit(*p))
146			continue;
147		switch (*p) {
148		case '.':
149			if (fraction != NULL)
150				goto badnum;
151			fraction = p + 1;
152			*p = '\0';
153			break;
154		case '-':
155			if (p == line)
156				break;
157			/* FALLTHROUGH */
158		default:
159badnum:			errx(1, "illegal number: %s", line);
160			break;
161		}
162	}
163	*p = '\0';
164
165	if ((len = strlen(line)) > MAXNUM ||
166	    fraction != NULL && (flen = strlen(fraction)) > MAXNUM)
167		errx(1, "number too large, max %d digits.", MAXNUM);
168
169	if (*line == '-') {
170		(void)printf("minus%s", lflag ? " " : "\n");
171		++line;
172		--len;
173	}
174
175	rval = len > 0 ? unit(len, line) : 0;
176	if (fraction != NULL && flen != 0)
177		for (p = fraction; *p != '\0'; ++p)
178			if (*p != '0') {
179				if (rval)
180					(void)printf("%sand%s",
181					    lflag ? " " : "",
182					    lflag ? " " : "\n");
183				if (unit(flen, fraction)) {
184					if (lflag)
185						(void)printf(" ");
186					pfract(flen);
187					rval = 1;
188				}
189				break;
190			}
191	if (!rval)
192		(void)printf("zero%s", lflag ? "" : ".\n");
193	if (lflag)
194		(void)printf("\n");
195}
196
197int
198unit(len, p)
199	int len;
200	char *p;
201{
202	int off, rval;
203
204	rval = 0;
205	if (len > 3) {
206		if (len % 3) {
207			off = len % 3;
208			len -= off;
209			if (number(p, off)) {
210				rval = 1;
211				(void)printf(" %s%s",
212				    name3[len / 3], lflag ? " " : ".\n");
213			}
214			p += off;
215		}
216		for (; len > 3; p += 3) {
217			len -= 3;
218			if (number(p, 3)) {
219				rval = 1;
220				(void)printf(" %s%s",
221				    name3[len / 3], lflag ? " " : ".\n");
222			}
223		}
224	}
225	if (number(p, len)) {
226		if (!lflag)
227			(void)printf(".\n");
228		rval = 1;
229	}
230	return (rval);
231}
232
233int
234number(p, len)
235	char *p;
236	int len;
237{
238	int val, rval;
239
240	rval = 0;
241	switch (len) {
242	case 3:
243		if (*p != '0') {
244			rval = 1;
245			(void)printf("%s hundred", name1[*p - '0']);
246		}
247		++p;
248		/* FALLTHROUGH */
249	case 2:
250		val = (p[1] - '0') + (p[0] - '0') * 10;
251		if (val) {
252			if (rval)
253				(void)printf(" ");
254			if (val < 20)
255				(void)printf("%s", name1[val]);
256			else {
257				(void)printf("%s", name2[val / 10]);
258				if (val % 10)
259					(void)printf("-%s", name1[val % 10]);
260			}
261			rval = 1;
262		}
263		break;
264	case 1:
265		if (*p != '0') {
266			rval = 1;
267			(void)printf("%s", name1[*p - '0']);
268		}
269	}
270	return (rval);
271}
272
273void
274pfract(len)
275	int len;
276{
277	static char *pref[] = { "", "ten-", "hundred-" };
278
279	switch(len) {
280	case 1:
281		(void)printf("tenths.\n");
282		break;
283	case 2:
284		(void)printf("hundredths.\n");
285		break;
286	default:
287		(void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
288		break;
289	}
290}
291
292void
293usage()
294{
295	(void)fprintf(stderr, "usage: number [# ...]\n");
296	exit(1);
297}
298