games/number/number.c

   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  * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)number.c 8.3 (Berkeley) 5/4/95
  31  * $FreeBSD: src/games/number/number.c,v 1.12 1999/12/12 03:22:35 billf Exp $
  32  * $DragonFly: src/games/number/number.c,v 1.5 2008/06/05 18:06:30 swildner Exp $
  33  */
  34
  35 #include <sys/types.h>
  36
  37 #include <ctype.h>
  38 #include <err.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43
  44 #define MAXNUM          65              /* Biggest number we handle. */
  45
  46 static const char       *name1[] = {
  47         "",             "one",          "two",          "three",
  48         "four",         "five",         "six",          "seven",
  49         "eight",        "nine",         "ten",          "eleven",
  50         "twelve",       "thirteen",     "fourteen",     "fifteen",
  51         "sixteen",      "seventeen",    "eighteen",     "nineteen",
  52 },
  53                 *name2[] = {
  54         "",             "ten",          "twenty",       "thirty",
  55         "forty",        "fifty",        "sixty",        "seventy",
  56         "eighty",       "ninety",
  57 },
  58                 *name3[] = {
  59         "hundred",      "thousand",     "million",      "billion",
  60         "trillion",     "quadrillion",  "quintillion",  "sextillion",
  61         "septillion",   "octillion",    "nonillion",    "decillion",
  62         "undecillion",  "duodecillion", "tredecillion", "quattuordecillion",
  63         "quindecillion",                "sexdecillion",
  64         "septendecillion",              "octodecillion",
  65         "novemdecillion",               "vigintillion",
  66 };
  67
  68 void    convert (char *);
  69 int     number (char *, int);
  70 void    pfract (int);
  71 void    toobig (void);
  72 int     unit (int, char *);
  73 void    usage (void);
  74
  75 int lflag;
  76
  77 int
  78 main(int argc, char **argv)
  79 {
  80         int ch, first;
  81         char line[256];
  82
  83         lflag = 0;
  84         while ((ch = getopt(argc, argv, "l")) != -1)
  85                 switch (ch) {
  86                 case 'l':
  87                         lflag = 1;
  88                         break;
  89                 case '?':
  90                 default:
  91                         usage();
  92                 }
  93         argc -= optind;
  94         argv += optind;
  95
  96         if (*argv == NULL)
  97                 for (first = 1;
  98                     fgets(line, sizeof(line), stdin) != NULL; first = 0) {
  99                         if (strchr(line, '\n') == NULL)
 100                                 errx(1, "line too long.");
 101                         if (!first)
 102                                 (void)printf("...\n");
 103                         convert(line);
 104                 }
 105         else
 106                 for (first = 1; *argv != NULL; first = 0, ++argv) {
 107                         if (!first)
 108                                 (void)printf("...\n");
 109                         convert(*argv);
 110                 }
 111         exit(0);
 112 }
 113
 114 void
 115 convert(char *line)
 116 {
 117         int flen, len, rval;
 118         char *p, *fraction;
 119
 120         flen = 0;
 121         fraction = NULL;
 122         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 123                 if (isblank(*p)) {
 124                         if (p == line) {
 125                                 ++line;
 126                                 continue;
 127                         }
 128                         goto badnum;
 129                 }
 130                 if (isdigit(*p))
 131                         continue;
 132                 switch (*p) {
 133                 case '.':
 134                         if (fraction != NULL)
 135                                 goto badnum;
 136                         fraction = p + 1;
 137                         *p = '\0';
 138                         break;
 139                 case '-':
 140                         if (p == line)
 141                                 break;
 142                         /* FALLTHROUGH */
 143                 default:
 144 badnum:                 errx(1, "illegal number: %s", line);
 145                         break;
 146                 }
 147         }
 148         *p = '\0';
 149
 150         if ((len = strlen(line)) > MAXNUM ||
 151             (fraction != NULL && ((flen = strlen(fraction)) > MAXNUM)))
 152                 errx(1, "number too large, max %d digits.", MAXNUM);
 153
 154         if (*line == '-') {
 155                 (void)printf("minus%s", lflag ? " " : "\n");
 156                 ++line;
 157                 --len;
 158         }
 159
 160         rval = len > 0 ? unit(len, line) : 0;
 161         if (fraction != NULL && flen != 0)
 162                 for (p = fraction; *p != '\0'; ++p)
 163                         if (*p != '0') {
 164                                 if (rval)
 165                                         (void)printf("%sand%s",
 166                                             lflag ? " " : "",
 167                                             lflag ? " " : "\n");
 168                                 if (unit(flen, fraction)) {
 169                                         if (lflag)
 170                                                 (void)printf(" ");
 171                                         pfract(flen);
 172                                         rval = 1;
 173                                 }
 174                                 break;
 175                         }
 176         if (!rval)
 177                 (void)printf("zero%s", lflag ? "" : ".\n");
 178         if (lflag)
 179                 (void)printf("\n");
 180 }
 181
 182 int
 183 unit(int len, char *p)
 184 {
 185         int off, rval;
 186
 187         rval = 0;
 188         if (len > 3) {
 189                 if (len % 3) {
 190                         off = len % 3;
 191                         len -= off;
 192                         if (number(p, off)) {
 193                                 rval = 1;
 194                                 (void)printf(" %s%s",
 195                                     name3[len / 3], lflag ? " " : ".\n");
 196                         }
 197                         p += off;
 198                 }
 199                 for (; len > 3; p += 3) {
 200                         len -= 3;
 201                         if (number(p, 3)) {
 202                                 rval = 1;
 203                                 (void)printf(" %s%s",
 204                                     name3[len / 3], lflag ? " " : ".\n");
 205                         }
 206                 }
 207         }
 208         if (number(p, len)) {
 209                 if (!lflag)
 210                         (void)printf(".\n");
 211                 rval = 1;
 212         }
 213         return (rval);
 214 }
 215
 216 int
 217 number(char *p, int len)
 218 {
 219         int val, rval;
 220
 221         rval = 0;
 222         switch (len) {
 223         case 3:
 224                 if (*p != '0') {
 225                         rval = 1;
 226                         (void)printf("%s hundred", name1[*p - '0']);
 227                 }
 228                 ++p;
 229                 /* FALLTHROUGH */
 230         case 2:
 231                 val = (p[1] - '0') + (p[0] - '0') * 10;
 232                 if (val) {
 233                         if (rval)
 234                                 (void)printf(" ");
 235                         if (val < 20)
 236                                 (void)printf("%s", name1[val]);
 237                         else {
 238                                 (void)printf("%s", name2[val / 10]);
 239                                 if (val % 10)
 240                                         (void)printf("-%s", name1[val % 10]);
 241                         }
 242                         rval = 1;
 243                 }
 244                 break;
 245         case 1:
 246                 if (*p != '0') {
 247                         rval = 1;
 248                         (void)printf("%s", name1[*p - '0']);
 249                 }
 250         }
 251         return (rval);
 252 }
 253
 254 void
 255 pfract(int len)
 256 {
 257         static const char *pref[] = { "", "ten-", "hundred-" };
 258
 259         switch(len) {
 260         case 1:
 261                 (void)printf("tenths.\n");
 262                 break;
 263         case 2:
 264                 (void)printf("hundredths.\n");
 265                 break;
 266         default:
 267                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 268                 break;
 269         }
 270 }
 271
 272 void
 273 usage(void)
 274 {
 275         (void)fprintf(stderr, "usage: number [# ...]\n");
 276         exit(1);
 277 }