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 #include <sys/types.h>
31
32 #include <ctype.h>
33 #include <err.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38
39 #define MAXNUM 65 /* Biggest number we handle. */
40
41 static const char *name1[] = {
42 "", "one", "two", "three",
43 "four", "five", "six", "seven",
44 "eight", "nine", "ten", "eleven",
45 "twelve", "thirteen", "fourteen", "fifteen",
46 "sixteen", "seventeen", "eighteen", "nineteen",
47 },
48 *name2[] = {
49 "", "ten", "twenty", "thirty",
50 "forty", "fifty", "sixty", "seventy",
51 "eighty", "ninety",
52 },
53 *name3[] = {
54 "hundred", "thousand", "million", "billion",
55 "trillion", "quadrillion", "quintillion", "sextillion",
56 "septillion", "octillion", "nonillion", "decillion",
57 "undecillion", "duodecillion", "tredecillion", "quattuordecillion",
58 "quindecillion", "sexdecillion",
59 "septendecillion", "octodecillion",
60 "novemdecillion", "vigintillion",
61 };
62
63 static void convert(char *);
64 static int number(char *, int);
65 static void pfract(int);
66 static int unit(int, char *);
67 static void usage(void);
68
69 static int lflag;
70
71 int
main(int argc,char * argv[])72 main(int argc, char *argv[])
73 {
74 int ch, first;
75 char line[256];
76
77 lflag = 0;
78 while ((ch = getopt(argc, argv, "l")) != -1)
79 switch (ch) {
80 case 'l':
81 lflag = 1;
82 break;
83 case '?':
84 default:
85 usage();
86 }
87 argc -= optind;
88 argv += optind;
89
90 if (*argv == NULL)
91 for (first = 1;
92 fgets(line, sizeof(line), stdin) != NULL; first = 0) {
93 if (strchr(line, '\n') == NULL)
94 errx(1, "line too long.");
95 if (!first)
96 (void)printf("...\n");
97 convert(line);
98 }
99 else
100 for (first = 1; *argv != NULL; first = 0, ++argv) {
101 if (!first)
102 (void)printf("...\n");
103 convert(*argv);
104 }
105 exit(0);
106 }
107
108 static void
convert(char * line)109 convert(char *line)
110 {
111 int flen, len, rval;
112 char *p, *fraction;
113
114 flen = 0;
115 fraction = NULL;
116 for (p = line; *p != '\0' && *p != '\n'; ++p) {
117 if (isblank(*p)) {
118 if (p == line) {
119 ++line;
120 continue;
121 }
122 goto badnum;
123 }
124 if (isdigit(*p))
125 continue;
126 switch (*p) {
127 case '.':
128 if (fraction != NULL)
129 goto badnum;
130 fraction = p + 1;
131 *p = '\0';
132 break;
133 case '-':
134 if (p == line)
135 break;
136 /* FALLTHROUGH */
137 default:
138 badnum: errx(1, "illegal number: %s", line);
139 break;
140 }
141 }
142 *p = '\0';
143
144 if ((len = strlen(line)) > MAXNUM ||
145 (fraction != NULL && ((flen = strlen(fraction)) > MAXNUM)))
146 errx(1, "number too large, max %d digits.", MAXNUM);
147
148 if (*line == '-') {
149 (void)printf("minus%s", lflag ? " " : "\n");
150 ++line;
151 --len;
152 }
153
154 rval = len > 0 ? unit(len, line) : 0;
155 if (fraction != NULL && flen != 0)
156 for (p = fraction; *p != '\0'; ++p)
157 if (*p != '0') {
158 if (rval)
159 (void)printf("%sand%s",
160 lflag ? " " : "",
161 lflag ? " " : "\n");
162 if (unit(flen, fraction)) {
163 if (lflag)
164 (void)printf(" ");
165 pfract(flen);
166 rval = 1;
167 }
168 break;
169 }
170 if (!rval)
171 (void)printf("zero%s", lflag ? "" : ".\n");
172 if (lflag)
173 (void)printf("\n");
174 }
175
176 static int
unit(int len,char * p)177 unit(int len, char *p)
178 {
179 int off, rval;
180
181 rval = 0;
182 if (len > 3) {
183 if (len % 3) {
184 off = len % 3;
185 len -= off;
186 if (number(p, off)) {
187 rval = 1;
188 (void)printf(" %s%s",
189 name3[len / 3], lflag ? " " : ".\n");
190 }
191 p += off;
192 }
193 for (; len > 3; p += 3) {
194 len -= 3;
195 if (number(p, 3)) {
196 rval = 1;
197 (void)printf(" %s%s",
198 name3[len / 3], lflag ? " " : ".\n");
199 }
200 }
201 }
202 if (number(p, len)) {
203 if (!lflag)
204 (void)printf(".\n");
205 rval = 1;
206 }
207 return (rval);
208 }
209
210 static int
number(char * p,int len)211 number(char *p, int len)
212 {
213 int val, rval;
214
215 rval = 0;
216 switch (len) {
217 case 3:
218 if (*p != '0') {
219 rval = 1;
220 (void)printf("%s hundred", name1[*p - '0']);
221 }
222 ++p;
223 /* FALLTHROUGH */
224 case 2:
225 val = (p[1] - '0') + (p[0] - '0') * 10;
226 if (val) {
227 if (rval)
228 (void)printf(" ");
229 if (val < 20)
230 (void)printf("%s", name1[val]);
231 else {
232 (void)printf("%s", name2[val / 10]);
233 if (val % 10)
234 (void)printf("-%s", name1[val % 10]);
235 }
236 rval = 1;
237 }
238 break;
239 case 1:
240 if (*p != '0') {
241 rval = 1;
242 (void)printf("%s", name1[*p - '0']);
243 }
244 }
245 return (rval);
246 }
247
248 static void
pfract(int len)249 pfract(int len)
250 {
251 static char const * const pref[] = { "", "ten-", "hundred-" };
252
253 switch(len) {
254 case 1:
255 (void)printf("tenths.\n");
256 break;
257 case 2:
258 (void)printf("hundredths.\n");
259 break;
260 default:
261 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
262 break;
263 }
264 }
265
266 static void
usage(void)267 usage(void)
268 {
269 (void)fprintf(stderr, "usage: number [-l] [# ...]\n");
270 exit(1);
271 }
272