1 /* $NetBSD: number.c,v 1.15 2012/06/19 05:46:09 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 1.15 2012/06/19 05:46:09 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 *, int); 82 static void pfract(int); 83 static int unit(int, const char *); 84 static void usage(void) __dead; 85 86 static int lflag; 87 88 int 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 126 convert(char *line) 127 { 128 int flen, len, rval; 129 char *p, *fraction; 130 131 flen = 0; 132 fraction = NULL; 133 for (p = line; *p != '\0' && *p != '\n'; ++p) { 134 if (isblank((unsigned char)*p)) { 135 if (p == line) { 136 ++line; 137 continue; 138 } 139 goto badnum; 140 } 141 if (isdigit((unsigned char)*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: 155 badnum: 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 --len; 169 } 170 171 rval = len > 0 ? unit(len, line) : 0; 172 if (fraction != NULL && flen != 0) 173 for (p = fraction; *p != '\0'; ++p) 174 if (*p != '0') { 175 if (rval) 176 (void)printf("%sand%s", 177 lflag ? " " : "", 178 lflag ? " " : "\n"); 179 if (unit(flen, fraction)) { 180 if (lflag) 181 (void)printf(" "); 182 pfract(flen); 183 rval = 1; 184 } 185 break; 186 } 187 if (!rval) 188 (void)printf("zero%s", lflag ? "" : ".\n"); 189 if (lflag) 190 (void)printf("\n"); 191 } 192 193 int 194 unit(int len, const char *p) 195 { 196 int off, rval; 197 198 rval = 0; 199 if (len > 3) { 200 if (len % 3) { 201 off = len % 3; 202 len -= off; 203 if (number(p, off)) { 204 rval = 1; 205 (void)printf(" %s%s", 206 name3[len / 3], lflag ? " " : ".\n"); 207 } 208 p += off; 209 } 210 for (; len > 3; p += 3) { 211 len -= 3; 212 if (number(p, 3)) { 213 rval = 1; 214 (void)printf(" %s%s", 215 name3[len / 3], lflag ? " " : ".\n"); 216 } 217 } 218 } 219 if (number(p, len)) { 220 if (!lflag) 221 (void)printf(".\n"); 222 rval = 1; 223 } 224 return (rval); 225 } 226 227 int 228 number(const char *p, int len) 229 { 230 int val, rval; 231 232 rval = 0; 233 switch (len) { 234 case 3: 235 if (*p != '0') { 236 rval = 1; 237 (void)printf("%s hundred", name1[*p - '0']); 238 } 239 ++p; 240 /* FALLTHROUGH */ 241 case 2: 242 val = (p[1] - '0') + (p[0] - '0') * 10; 243 if (val) { 244 if (rval) 245 (void)printf(" "); 246 if (val < 20) 247 (void)printf("%s", name1[val]); 248 else { 249 (void)printf("%s", name2[val / 10]); 250 if (val % 10) 251 (void)printf("-%s", name1[val % 10]); 252 } 253 rval = 1; 254 } 255 break; 256 case 1: 257 if (*p != '0') { 258 rval = 1; 259 (void)printf("%s", name1[*p - '0']); 260 } 261 } 262 return (rval); 263 } 264 265 void 266 pfract(int len) 267 { 268 static const char *const pref[] = { "", "ten-", "hundred-" }; 269 270 switch(len) { 271 case 1: 272 (void)printf("tenths.\n"); 273 break; 274 case 2: 275 (void)printf("hundredths.\n"); 276 break; 277 default: 278 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]); 279 break; 280 } 281 } 282 283 void 284 usage(void) 285 { 286 (void)fprintf(stderr, "usage: number [# ...]\n"); 287 exit(1); 288 } 289