number.c revision 203932 
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. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1988, 1993, 1994\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)number.c	8.3 (Berkeley) 5/4/95";
39#endif
40static const char rcsid[] =
41 "$FreeBSD: head/games/number/number.c 203932 2010-02-15 18:46:02Z imp $";
42#endif /* not lint */
43
44#include <sys/types.h>
45
46#include <ctype.h>
47#include <err.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51#include <unistd.h>
52
53#define	MAXNUM		65		/* Biggest number we handle. */
54
55static const char	*name1[] = {
56	"",		"one",		"two",		"three",
57	"four",		"five",		"six",		"seven",
58	"eight",	"nine",		"ten",		"eleven",
59	"twelve",	"thirteen",	"fourteen",	"fifteen",
60	"sixteen",	"seventeen",	"eighteen",	"nineteen",
61},
62		*name2[] = {
63	"",		"ten",		"twenty",	"thirty",
64	"forty",	"fifty",	"sixty",	"seventy",
65	"eighty",	"ninety",
66},
67		*name3[] = {
68	"hundred",	"thousand",	"million",	"billion",
69	"trillion",	"quadrillion",	"quintillion",	"sextillion",
70	"septillion",	"octillion",	"nonillion",	"decillion",
71	"undecillion",	"duodecillion",	"tredecillion",	"quattuordecillion",
72	"quindecillion",		"sexdecillion",
73	"septendecillion",		"octodecillion",
74	"novemdecillion",		"vigintillion",
75};
76
77void	convert(char *);
78int	number(char *, int);
79void	pfract(int);
80void	toobig(void);
81int	unit(int, char *);
82void	usage(void);
83
84int lflag;
85
86int
87main(int argc, char *argv[])
88{
89	int ch, first;
90	char line[256];
91
92	lflag = 0;
93	while ((ch = getopt(argc, argv, "l")) != -1)
94		switch (ch) {
95		case 'l':
96			lflag = 1;
97			break;
98		case '?':
99		default:
100			usage();
101		}
102	argc -= optind;
103	argv += optind;
104
105	if (*argv == NULL)
106		for (first = 1;
107		    fgets(line, sizeof(line), stdin) != NULL; first = 0) {
108			if (strchr(line, '\n') == NULL)
109				errx(1, "line too long.");
110			if (!first)
111				(void)printf("...\n");
112			convert(line);
113		}
114	else
115		for (first = 1; *argv != NULL; first = 0, ++argv) {
116			if (!first)
117				(void)printf("...\n");
118			convert(*argv);
119		}
120	exit(0);
121}
122
123void
124convert(char *line)
125{
126	int flen, len, rval;
127	char *p, *fraction;
128
129	flen = 0;
130	fraction = NULL;
131	for (p = line; *p != '\0' && *p != '\n'; ++p) {
132		if (isblank(*p)) {
133			if (p == line) {
134				++line;
135				continue;
136			}
137			goto badnum;
138		}
139		if (isdigit(*p))
140			continue;
141		switch (*p) {
142		case '.':
143			if (fraction != NULL)
144				goto badnum;
145			fraction = p + 1;
146			*p = '\0';
147			break;
148		case '-':
149			if (p == line)
150				break;
151			/* FALLTHROUGH */
152		default:
153badnum:			errx(1, "illegal number: %s", line);
154			break;
155		}
156	}
157	*p = '\0';
158
159	if ((len = strlen(line)) > MAXNUM ||
160	    (fraction != NULL && ((flen = strlen(fraction)) > MAXNUM)))
161		errx(1, "number too large, max %d digits.", MAXNUM);
162
163	if (*line == '-') {
164		(void)printf("minus%s", lflag ? " " : "\n");
165		++line;
166		--len;
167	}
168
169	rval = len > 0 ? unit(len, line) : 0;
170	if (fraction != NULL && flen != 0)
171		for (p = fraction; *p != '\0'; ++p)
172			if (*p != '0') {
173				if (rval)
174					(void)printf("%sand%s",
175					    lflag ? " " : "",
176					    lflag ? " " : "\n");
177				if (unit(flen, fraction)) {
178					if (lflag)
179						(void)printf(" ");
180					pfract(flen);
181					rval = 1;
182				}
183				break;
184			}
185	if (!rval)
186		(void)printf("zero%s", lflag ? "" : ".\n");
187	if (lflag)
188		(void)printf("\n");
189}
190
191int
192unit(int len, char *p)
193{
194	int off, rval;
195
196	rval = 0;
197	if (len > 3) {
198		if (len % 3) {
199			off = len % 3;
200			len -= off;
201			if (number(p, off)) {
202				rval = 1;
203				(void)printf(" %s%s",
204				    name3[len / 3], lflag ? " " : ".\n");
205			}
206			p += off;
207		}
208		for (; len > 3; p += 3) {
209			len -= 3;
210			if (number(p, 3)) {
211				rval = 1;
212				(void)printf(" %s%s",
213				    name3[len / 3], lflag ? " " : ".\n");
214			}
215		}
216	}
217	if (number(p, len)) {
218		if (!lflag)
219			(void)printf(".\n");
220		rval = 1;
221	}
222	return (rval);
223}
224
225int
226number(char *p, int len)
227{
228	int val, rval;
229
230	rval = 0;
231	switch (len) {
232	case 3:
233		if (*p != '0') {
234			rval = 1;
235			(void)printf("%s hundred", name1[*p - '0']);
236		}
237		++p;
238		/* FALLTHROUGH */
239	case 2:
240		val = (p[1] - '0') + (p[0] - '0') * 10;
241		if (val) {
242			if (rval)
243				(void)printf(" ");
244			if (val < 20)
245				(void)printf("%s", name1[val]);
246			else {
247				(void)printf("%s", name2[val / 10]);
248				if (val % 10)
249					(void)printf("-%s", name1[val % 10]);
250			}
251			rval = 1;
252		}
253		break;
254	case 1:
255		if (*p != '0') {
256			rval = 1;
257			(void)printf("%s", name1[*p - '0']);
258		}
259	}
260	return (rval);
261}
262
263void
264pfract(int len)
265{
266	static char const * const pref[] = { "", "ten-", "hundred-" };
267
268	switch(len) {
269	case 1:
270		(void)printf("tenths.\n");
271		break;
272	case 2:
273		(void)printf("hundredths.\n");
274		break;
275	default:
276		(void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
277		break;
278	}
279}
280
281void
282usage(void)
283{
284	(void)fprintf(stderr, "usage: number [-l] [# ...]\n");
285	exit(1);
286}
287