number.c revision 23726 
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 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
41static char sccsid[] = "@(#)number.c	8.3 (Berkeley) 5/4/95";
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 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 __P((char *));
78int	number __P((char *, int));
79void	pfract __P((int));
80void	toobig __P((void));
81int	unit __P((int, char *));
82void	usage __P((void));
83
84int lflag;
85
86int
87main(argc, argv)
88	int argc;
89	char *argv[];
90{
91	int ch, first;
92	char line[256];
93
94	lflag = 0;
95	while ((ch = getopt(argc, argv, "l")) != EOF)
96		switch (ch) {
97		case 'l':
98			lflag = 1;
99			break;
100		case '?':
101		default:
102			usage();
103		}
104	argc -= optind;
105	argv += optind;
106
107	if (*argv == NULL)
108		for (first = 1;
109		    fgets(line, sizeof(line), stdin) != NULL; first = 0) {
110			if (strchr(line, '\n') == NULL)
111				errx(1, "line too long.");
112			if (!first)
113				(void)printf("...\n");
114			convert(line);
115		}
116	else
117		for (first = 1; *argv != NULL; first = 0, ++argv) {
118			if (!first)
119				(void)printf("...\n");
120			convert(*argv);
121		}
122	exit(0);
123}
124
125void
126convert(line)
127	char *line;
128{
129	register flen, len, rval;
130	register char *p, *fraction;
131
132	fraction = NULL;
133	for (p = line; *p != '\0' && *p != '\n'; ++p) {
134		if (isblank(*p)) {
135			if (p == line) {
136				++line;
137				continue;
138			}
139			goto badnum;
140		}
141		if (isdigit(*p))
142			continue;
143		switch (*p) {
144		case '.':
145			if (fraction != NULL)
146				goto badnum;
147			fraction = p + 1;
148			*p = '\0';
149			break;
150		case '-':
151			if (p == line)
152				break;
153			/* FALLTHROUGH */
154		default:
155badnum:			errx(1, "illegal number: %s", line);
156			break;
157		}
158	}
159	*p = '\0';
160
161	if ((len = strlen(line)) > MAXNUM ||
162	    fraction != NULL && (flen = strlen(fraction)) > MAXNUM)
163		errx(1, "number too large, max %d digits.", MAXNUM);
164
165	if (*line == '-') {
166		(void)printf("minus%s", lflag ? " " : "\n");
167		++line;
168	}
169
170	rval = len > 0 ? unit(len, line) : 0;
171	if (fraction != NULL && flen != 0)
172		for (p = fraction; *p != '\0'; ++p)
173			if (*p != '0') {
174				if (rval)
175					(void)printf("%sand%s",
176					    lflag ? " " : "",
177					    lflag ? " " : "\n");
178				if (unit(flen, fraction)) {
179					if (lflag)
180						(void)printf(" ");
181					pfract(flen);
182					rval = 1;
183				}
184				break;
185			}
186	if (!rval)
187		(void)printf("zero%s", lflag ? "" : ".\n");
188	if (lflag)
189		(void)printf("\n");
190}
191
192int
193unit(len, p)
194	register int len;
195	register char *p;
196{
197	register int off, rval;
198
199	rval = 0;
200	if (len > 3) {
201		if (len % 3) {
202			off = len % 3;
203			len -= off;
204			if (number(p, off)) {
205				rval = 1;
206				(void)printf(" %s%s",
207				    name3[len / 3], lflag ? " " : ".\n");
208			}
209			p += off;
210		}
211		for (; len > 3; p += 3) {
212			len -= 3;
213			if (number(p, 3)) {
214				rval = 1;
215				(void)printf(" %s%s",
216				    name3[len / 3], lflag ? " " : ".\n");
217			}
218		}
219	}
220	if (number(p, len)) {
221		if (!lflag)
222			(void)printf(".\n");
223		rval = 1;
224	}
225	return (rval);
226}
227
228int
229number(p, len)
230	register char *p;
231	int len;
232{
233	register int val, rval;
234
235	rval = 0;
236	switch (len) {
237	case 3:
238		if (*p != '0') {
239			rval = 1;
240			(void)printf("%s hundred", name1[*p - '0']);
241		}
242		++p;
243		/* FALLTHROUGH */
244	case 2:
245		val = (p[1] - '0') + (p[0] - '0') * 10;
246		if (val) {
247			if (rval)
248				(void)printf(" ");
249			if (val < 20)
250				(void)printf("%s", name1[val]);
251			else {
252				(void)printf("%s", name2[val / 10]);
253				if (val % 10)
254					(void)printf("-%s", name1[val % 10]);
255			}
256			rval = 1;
257		}
258		break;
259	case 1:
260		if (*p != '0') {
261			rval = 1;
262			(void)printf("%s", name1[*p - '0']);
263		}
264	}
265	return (rval);
266}
267
268void
269pfract(len)
270	int len;
271{
272	static char *pref[] = { "", "ten-", "hundred-" };
273
274	switch(len) {
275	case 1:
276		(void)printf("tenths.\n");
277		break;
278	case 2:
279		(void)printf("hundredths.\n");
280		break;
281	default:
282		(void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
283		break;
284	}
285}
286
287void
288usage()
289{
290	(void)fprintf(stderr, "usage: number [# ...]\n");
291	exit(1);
292}
293