number.c revision 53210 
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 * $FreeBSD: head/games/number/number.c 53210 1999-11-16 02:58:06Z billf $
34 */
35
36#ifndef lint
37static char copyright[] =
38"@(#) Copyright (c) 1988, 1993, 1994\n\
39	The Regents of the University of California.  All rights reserved.\n";
40#endif /* not lint */
41
42#ifndef lint
43static char sccsid[] = "@(#)number.c	8.3 (Berkeley) 5/4/95";
44#endif /* not lint */
45
46#include <sys/types.h>
47
48#include <ctype.h>
49#include <err.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54
55#define	MAXNUM		65		/* Biggest number we handle. */
56
57static char	*name1[] = {
58	"",		"one",		"two",		"three",
59	"four",		"five",		"six",		"seven",
60	"eight",	"nine",		"ten",		"eleven",
61	"twelve",	"thirteen",	"fourteen",	"fifteen",
62	"sixteen",	"seventeen",	"eighteen",	"nineteen",
63},
64		*name2[] = {
65	"",		"ten",		"twenty",	"thirty",
66	"forty",	"fifty",	"sixty",	"seventy",
67	"eighty",	"ninety",
68},
69		*name3[] = {
70	"hundred",	"thousand",	"million",	"billion",
71	"trillion",	"quadrillion",	"quintillion",	"sextillion",
72	"septillion",	"octillion",	"nonillion",	"decillion",
73	"undecillion",	"duodecillion",	"tredecillion",	"quattuordecillion",
74	"quindecillion",		"sexdecillion",
75	"septendecillion",		"octodecillion",
76	"novemdecillion",		"vigintillion",
77};
78
79void	convert __P((char *));
80int	number __P((char *, int));
81void	pfract __P((int));
82void	toobig __P((void));
83int	unit __P((int, char *));
84void	usage __P((void));
85
86int lflag;
87
88int
89main(argc, argv)
90	int argc;
91	char *argv[];
92{
93	int ch, first;
94	char line[256];
95
96	lflag = 0;
97	while ((ch = getopt(argc, argv, "l")) != -1)
98		switch (ch) {
99		case 'l':
100			lflag = 1;
101			break;
102		case '?':
103		default:
104			usage();
105		}
106	argc -= optind;
107	argv += optind;
108
109	if (*argv == NULL)
110		for (first = 1;
111		    fgets(line, sizeof(line), stdin) != NULL; first = 0) {
112			if (strchr(line, '\n') == NULL)
113				errx(1, "line too long.");
114			if (!first)
115				(void)printf("...\n");
116			convert(line);
117		}
118	else
119		for (first = 1; *argv != NULL; first = 0, ++argv) {
120			if (!first)
121				(void)printf("...\n");
122			convert(*argv);
123		}
124	exit(0);
125}
126
127void
128convert(line)
129	char *line;
130{
131	flen, len, rval;
132	char *p, *fraction;
133
134	fraction = NULL;
135	for (p = line; *p != '\0' && *p != '\n'; ++p) {
136		if (isblank(*p)) {
137			if (p == line) {
138				++line;
139				continue;
140			}
141			goto badnum;
142		}
143		if (isdigit(*p))
144			continue;
145		switch (*p) {
146		case '.':
147			if (fraction != NULL)
148				goto badnum;
149			fraction = p + 1;
150			*p = '\0';
151			break;
152		case '-':
153			if (p == line)
154				break;
155			/* FALLTHROUGH */
156		default:
157badnum:			errx(1, "illegal number: %s", line);
158			break;
159		}
160	}
161	*p = '\0';
162
163	if ((len = strlen(line)) > MAXNUM ||
164	    fraction != NULL && (flen = strlen(fraction)) > MAXNUM)
165		errx(1, "number too large, max %d digits.", MAXNUM);
166
167	if (*line == '-') {
168		(void)printf("minus%s", lflag ? " " : "\n");
169		++line;
170		--len;
171	}
172
173	rval = len > 0 ? unit(len, line) : 0;
174	if (fraction != NULL && flen != 0)
175		for (p = fraction; *p != '\0'; ++p)
176			if (*p != '0') {
177				if (rval)
178					(void)printf("%sand%s",
179					    lflag ? " " : "",
180					    lflag ? " " : "\n");
181				if (unit(flen, fraction)) {
182					if (lflag)
183						(void)printf(" ");
184					pfract(flen);
185					rval = 1;
186				}
187				break;
188			}
189	if (!rval)
190		(void)printf("zero%s", lflag ? "" : ".\n");
191	if (lflag)
192		(void)printf("\n");
193}
194
195int
196unit(len, p)
197	int len;
198	char *p;
199{
200	int off, rval;
201
202	rval = 0;
203	if (len > 3) {
204		if (len % 3) {
205			off = len % 3;
206			len -= off;
207			if (number(p, off)) {
208				rval = 1;
209				(void)printf(" %s%s",
210				    name3[len / 3], lflag ? " " : ".\n");
211			}
212			p += off;
213		}
214		for (; len > 3; p += 3) {
215			len -= 3;
216			if (number(p, 3)) {
217				rval = 1;
218				(void)printf(" %s%s",
219				    name3[len / 3], lflag ? " " : ".\n");
220			}
221		}
222	}
223	if (number(p, len)) {
224		if (!lflag)
225			(void)printf(".\n");
226		rval = 1;
227	}
228	return (rval);
229}
230
231int
232number(p, len)
233	char *p;
234	int len;
235{
236	int val, rval;
237
238	rval = 0;
239	switch (len) {
240	case 3:
241		if (*p != '0') {
242			rval = 1;
243			(void)printf("%s hundred", name1[*p - '0']);
244		}
245		++p;
246		/* FALLTHROUGH */
247	case 2:
248		val = (p[1] - '0') + (p[0] - '0') * 10;
249		if (val) {
250			if (rval)
251				(void)printf(" ");
252			if (val < 20)
253				(void)printf("%s", name1[val]);
254			else {
255				(void)printf("%s", name2[val / 10]);
256				if (val % 10)
257					(void)printf("-%s", name1[val % 10]);
258			}
259			rval = 1;
260		}
261		break;
262	case 1:
263		if (*p != '0') {
264			rval = 1;
265			(void)printf("%s", name1[*p - '0']);
266		}
267	}
268	return (rval);
269}
270
271void
272pfract(len)
273	int len;
274{
275	static char *pref[] = { "", "ten-", "hundred-" };
276
277	switch(len) {
278	case 1:
279		(void)printf("tenths.\n");
280		break;
281	case 2:
282		(void)printf("hundredths.\n");
283		break;
284	default:
285		(void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
286		break;
287	}
288}
289
290void
291usage()
292{
293	(void)fprintf(stderr, "usage: number [# ...]\n");
294	exit(1);
295}
296