1 /* $NetBSD: number.c,v 1.16 2014/03/23 00:03:04 dholland Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\
35 The Regents of the University of California. All rights reserved.");
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)number.c 8.3 (Berkeley) 5/4/95";
41 #else
42 __RCSID("$NetBSD: number.c,v 1.16 2014/03/23 00:03:04 dholland Exp $");
43 #endif
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
57 static const char *const 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 *const name2[] = {
65 "", "ten", "twenty", "thirty",
66 "forty", "fifty", "sixty", "seventy",
67 "eighty", "ninety",
68 },
69 *const 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
79 int main(int, char *[]);
80 static void convert(char *);
81 static int number(const char *, size_t);
82 static void pfract(size_t);
83 static int unit(size_t, const char *);
84 static void usage(void) __dead;
85
86 static int lflag;
87
88 int
main(int argc,char * argv[])89 main(int argc, char *argv[])
90 {
91 int ch, first;
92 char line[256];
93
94 lflag = 0;
95 while ((ch = getopt(argc, argv, "l")) != -1)
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
125 void
convert(char * line)126 convert(char *line)
127 {
128 size_t flen, len;
129 int rval;
130 char *p, *fraction;
131
132 flen = 0;
133 fraction = NULL;
134 for (p = line; *p != '\0' && *p != '\n'; ++p) {
135 if (isblank((unsigned char)*p)) {
136 if (p == line) {
137 ++line;
138 continue;
139 }
140 goto badnum;
141 }
142 if (isdigit((unsigned char)*p))
143 continue;
144 switch (*p) {
145 case '.':
146 if (fraction != NULL)
147 goto badnum;
148 fraction = p + 1;
149 *p = '\0';
150 break;
151 case '-':
152 if (p == line)
153 break;
154 /* FALLTHROUGH */
155 default:
156 badnum: errx(1, "illegal number: %s", line);
157 break;
158 }
159 }
160 *p = '\0';
161
162 if ((len = strlen(line)) > MAXNUM ||
163 (fraction != NULL && (flen = strlen(fraction)) > MAXNUM))
164 errx(1, "number too large, max %d digits.", MAXNUM);
165
166 if (*line == '-') {
167 (void)printf("minus%s", lflag ? " " : "\n");
168 ++line;
169 --len;
170 }
171
172 rval = len > 0 ? unit(len, line) : 0;
173 if (fraction != NULL && flen != 0)
174 for (p = fraction; *p != '\0'; ++p)
175 if (*p != '0') {
176 if (rval)
177 (void)printf("%sand%s",
178 lflag ? " " : "",
179 lflag ? " " : "\n");
180 if (unit(flen, fraction)) {
181 if (lflag)
182 (void)printf(" ");
183 pfract(flen);
184 rval = 1;
185 }
186 break;
187 }
188 if (!rval)
189 (void)printf("zero%s", lflag ? "" : ".\n");
190 if (lflag)
191 (void)printf("\n");
192 }
193
194 int
unit(size_t len,const char * p)195 unit(size_t len, const char *p)
196 {
197 size_t off;
198 int 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
229 int
number(const char * p,size_t len)230 number(const char *p, size_t 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
267 void
pfract(size_t len)268 pfract(size_t len)
269 {
270 static const char *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
285 void
usage(void)286 usage(void)
287 {
288 (void)fprintf(stderr, "usage: number [# ...]\n");
289 exit(1);
290 }
291