number.c revision 201176 
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 201176 2009-12-29 08:43:32Z ed $";
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 const 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(char *);
82int	number(char *, int);
83void	pfract(int);
84void	toobig(void);
85int	unit(int, char *);
86void	usage(void);
87
88int lflag;
89
90int
91main(int argc, 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(char *line)
129{
130	int flen, len, rval;
131	char *p, *fraction;
132
133	flen = 0;
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(int len, char *p)
197{
198	int off, rval;
199
200	rval = 0;
201	if (len > 3) {
202		if (len % 3) {
203			off = len % 3;
204			len -= off;
205			if (number(p, off)) {
206				rval = 1;
207				(void)printf(" %s%s",
208				    name3[len / 3], lflag ? " " : ".\n");
209			}
210			p += off;
211		}
212		for (; len > 3; p += 3) {
213			len -= 3;
214			if (number(p, 3)) {
215				rval = 1;
216				(void)printf(" %s%s",
217				    name3[len / 3], lflag ? " " : ".\n");
218			}
219		}
220	}
221	if (number(p, len)) {
222		if (!lflag)
223			(void)printf(".\n");
224		rval = 1;
225	}
226	return (rval);
227}
228
229int
230number(char *p, int len)
231{
232	int val, rval;
233
234	rval = 0;
235	switch (len) {
236	case 3:
237		if (*p != '0') {
238			rval = 1;
239			(void)printf("%s hundred", name1[*p - '0']);
240		}
241		++p;
242		/* FALLTHROUGH */
243	case 2:
244		val = (p[1] - '0') + (p[0] - '0') * 10;
245		if (val) {
246			if (rval)
247				(void)printf(" ");
248			if (val < 20)
249				(void)printf("%s", name1[val]);
250			else {
251				(void)printf("%s", name2[val / 10]);
252				if (val % 10)
253					(void)printf("-%s", name1[val % 10]);
254			}
255			rval = 1;
256		}
257		break;
258	case 1:
259		if (*p != '0') {
260			rval = 1;
261			(void)printf("%s", name1[*p - '0']);
262		}
263	}
264	return (rval);
265}
266
267void
268pfract(int len)
269{
270	static char const * const pref[] = { "", "ten-", "hundred-" };
271
272	switch(len) {
273	case 1:
274		(void)printf("tenths.\n");
275		break;
276	case 2:
277		(void)printf("hundredths.\n");
278		break;
279	default:
280		(void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
281		break;
282	}
283}
284
285void
286usage(void)
287{
288	(void)fprintf(stderr, "usage: number [-l] [# ...]\n");
289	exit(1);
290}
291