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  */
  33
  34 #include <sys/types.h>
  35
  36 #include <ctype.h>
  37 #include <err.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 #define MAXNUM          65              /* Biggest number we handle. */
  44
  45 static const char       *name1[] = {
  46         "",             "one",          "two",          "three",
  47         "four",         "five",         "six",          "seven",
  48         "eight",        "nine",         "ten",          "eleven",
  49         "twelve",       "thirteen",     "fourteen",     "fifteen",
  50         "sixteen",      "seventeen",    "eighteen",     "nineteen",
  51 },
  52                 *name2[] = {
  53         "",             "ten",          "twenty",       "thirty",
  54         "forty",        "fifty",        "sixty",        "seventy",
  55         "eighty",       "ninety",
  56 },
  57                 *name3[] = {
  58         "hundred",      "thousand",     "million",      "billion",
  59         "trillion",     "quadrillion",  "quintillion",  "sextillion",
  60         "septillion",   "octillion",    "nonillion",    "decillion",
  61         "undecillion",  "duodecillion", "tredecillion", "quattuordecillion",
  62         "quindecillion",                "sexdecillion",
  63         "septendecillion",              "octodecillion",
  64         "novemdecillion",               "vigintillion",
  65 };
  66
  67 static void     convert(char *);
  68 static int      number(char *, int);
  69 static void     pfract(int);
  70 static int      unit(int, char *);
  71 static void     usage(void) __dead2;
  72
  73 static int lflag;
  74
  75 int
  76 main(int argc, char **argv)
  77 {
  78         int ch, first;
  79         char line[256];
  80
  81         lflag = 0;
  82         while ((ch = getopt(argc, argv, "l")) != -1)
  83                 switch (ch) {
  84                 case 'l':
  85                         lflag = 1;
  86                         break;
  87                 case '?':
  88                 default:
  89                         usage();
  90                 }
  91         argc -= optind;
  92         argv += optind;
  93
  94         if (*argv == NULL)
  95                 for (first = 1;
  96                     fgets(line, sizeof(line), stdin) != NULL; first = 0) {
  97                         if (strchr(line, '\n') == NULL)
  98                                 errx(1, "line too long.");
  99                         if (!first)
 100                                 printf("...\n");
 101                         convert(line);
 102                 }
 103         else
 104                 for (first = 1; *argv != NULL; first = 0, ++argv) {
 105                         if (!first)
 106                                 printf("...\n");
 107                         convert(*argv);
 108                 }
 109         exit(0);
 110 }
 111
 112 static void
 113 convert(char *line)
 114 {
 115         int flen, len, rval;
 116         char *p, *fraction;
 117
 118         flen = 0;
 119         fraction = NULL;
 120         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 121                 if (isblank(*p)) {
 122                         if (p == line) {
 123                                 ++line;
 124                                 continue;
 125                         }
 126                         goto badnum;
 127                 }
 128                 if (isdigit(*p))
 129                         continue;
 130                 switch (*p) {
 131                 case '.':
 132                         if (fraction != NULL)
 133                                 goto badnum;
 134                         fraction = p + 1;
 135                         *p = '\0';
 136                         break;
 137                 case '-':
 138                         if (p == line)
 139                                 break;
 140                         /* FALLTHROUGH */
 141                 default:
 142 badnum:                 errx(1, "illegal number: %s", line);
 143                         break;
 144                 }
 145         }
 146         *p = '\0';
 147
 148         if ((len = strlen(line)) > MAXNUM ||
 149             (fraction != NULL && ((flen = strlen(fraction)) > MAXNUM)))
 150                 errx(1, "number too large, max %d digits.", MAXNUM);
 151
 152         if (*line == '-') {
 153                 printf("minus%s", lflag ? " " : "\n");
 154                 ++line;
 155                 --len;
 156         }
 157
 158         rval = len > 0 ? unit(len, line) : 0;
 159         if (fraction != NULL && flen != 0)
 160                 for (p = fraction; *p != '\0'; ++p)
 161                         if (*p != '0') {
 162                                 if (rval)
 163                                         printf("%sand%s",
 164                                             lflag ? " " : "",
 165                                             lflag ? " " : "\n");
 166                                 if (unit(flen, fraction)) {
 167                                         if (lflag)
 168                                                 printf(" ");
 169                                         pfract(flen);
 170                                         rval = 1;
 171                                 }
 172                                 break;
 173                         }
 174         if (!rval)
 175                 printf("zero%s", lflag ? "" : ".\n");
 176         if (lflag)
 177                 printf("\n");
 178 }
 179
 180 static int
 181 unit(int len, char *p)
 182 {
 183         int off, rval;
 184
 185         rval = 0;
 186         if (len > 3) {
 187                 if (len % 3) {
 188                         off = len % 3;
 189                         len -= off;
 190                         if (number(p, off)) {
 191                                 rval = 1;
 192                                 printf(" %s%s",
 193                                     name3[len / 3], lflag ? " " : ".\n");
 194                         }
 195                         p += off;
 196                 }
 197                 for (; len > 3; p += 3) {
 198                         len -= 3;
 199                         if (number(p, 3)) {
 200                                 rval = 1;
 201                                 printf(" %s%s",
 202                                     name3[len / 3], lflag ? " " : ".\n");
 203                         }
 204                 }
 205         }
 206         if (number(p, len)) {
 207                 if (!lflag)
 208                         printf(".\n");
 209                 rval = 1;
 210         }
 211         return (rval);
 212 }
 213
 214 static int
 215 number(char *p, int len)
 216 {
 217         int val, rval;
 218
 219         rval = 0;
 220         switch (len) {
 221         case 3:
 222                 if (*p != '0') {
 223                         rval = 1;
 224                         printf("%s hundred", name1[*p - '0']);
 225                 }
 226                 ++p;
 227                 /* FALLTHROUGH */
 228         case 2:
 229                 val = (p[1] - '0') + (p[0] - '0') * 10;
 230                 if (val) {
 231                         if (rval)
 232                                 printf(" ");
 233                         if (val < 20)
 234                                 printf("%s", name1[val]);
 235                         else {
 236                                 printf("%s", name2[val / 10]);
 237                                 if (val % 10)
 238                                         printf("-%s", name1[val % 10]);
 239                         }
 240                         rval = 1;
 241                 }
 242                 break;
 243         case 1:
 244                 if (*p != '0') {
 245                         rval = 1;
 246                         printf("%s", name1[*p - '0']);
 247                 }
 248         }
 249         return (rval);
 250 }
 251
 252 static void
 253 pfract(int len)
 254 {
 255         static const char *pref[] = { "", "ten-", "hundred-" };
 256
 257         switch(len) {
 258         case 1:
 259                 printf("tenths.\n");
 260                 break;
 261         case 2:
 262                 printf("hundredths.\n");
 263                 break;
 264         default:
 265                 printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 266                 break;
 267         }
 268 }
 269
 270 static void
 271 usage(void)
 272 {
 273         fprintf(stderr, "usage: number [# ...]\n");
 274         exit(1);
 275 }