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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)number.c 8.3 (Berkeley) 5/4/95
  35  * $FreeBSD: src/games/number/number.c,v 1.12 1999/12/12 03:22:35 billf Exp $
  36  * $DragonFly: src/games/number/number.c,v 1.3 2003/11/12 14:53:53 eirikn Exp $
  37  */
  38
  39 #include <sys/types.h>
  40
  41 #include <ctype.h>
  42 #include <err.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47
  48 #define MAXNUM          65              /* Biggest number we handle. */
  49
  50 static const char       *name1[] = {
  51         "",             "one",          "two",          "three",
  52         "four",         "five",         "six",          "seven",
  53         "eight",        "nine",         "ten",          "eleven",
  54         "twelve",       "thirteen",     "fourteen",     "fifteen",
  55         "sixteen",      "seventeen",    "eighteen",     "nineteen",
  56 },
  57                 *name2[] = {
  58         "",             "ten",          "twenty",       "thirty",
  59         "forty",        "fifty",        "sixty",        "seventy",
  60         "eighty",       "ninety",
  61 },
  62                 *name3[] = {
  63         "hundred",      "thousand",     "million",      "billion",
  64         "trillion",     "quadrillion",  "quintillion",  "sextillion",
  65         "septillion",   "octillion",    "nonillion",    "decillion",
  66         "undecillion",  "duodecillion", "tredecillion", "quattuordecillion",
  67         "quindecillion",                "sexdecillion",
  68         "septendecillion",              "octodecillion",
  69         "novemdecillion",               "vigintillion",
  70 };
  71
  72 void    convert (char *);
  73 int     number (char *, int);
  74 void    pfract (int);
  75 void    toobig (void);
  76 int     unit (int, char *);
  77 void    usage (void);
  78
  79 int lflag;
  80
  81 int
  82 main(argc, argv)
  83         int argc;
  84         char *argv[];
  85 {
  86         int ch, first;
  87         char line[256];
  88
  89         lflag = 0;
  90         while ((ch = getopt(argc, argv, "l")) != -1)
  91                 switch (ch) {
  92                 case 'l':
  93                         lflag = 1;
  94                         break;
  95                 case '?':
  96                 default:
  97                         usage();
  98                 }
  99         argc -= optind;
 100         argv += optind;
 101
 102         if (*argv == NULL)
 103                 for (first = 1;
 104                     fgets(line, sizeof(line), stdin) != NULL; first = 0) {
 105                         if (strchr(line, '\n') == NULL)
 106                                 errx(1, "line too long.");
 107                         if (!first)
 108                                 (void)printf("...\n");
 109                         convert(line);
 110                 }
 111         else
 112                 for (first = 1; *argv != NULL; first = 0, ++argv) {
 113                         if (!first)
 114                                 (void)printf("...\n");
 115                         convert(*argv);
 116                 }
 117         exit(0);
 118 }
 119
 120 void
 121 convert(line)
 122         char *line;
 123 {
 124         int flen, len, rval;
 125         char *p, *fraction;
 126
 127         flen = NULL;
 128         fraction = NULL;
 129         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 130                 if (isblank(*p)) {
 131                         if (p == line) {
 132                                 ++line;
 133                                 continue;
 134                         }
 135                         goto badnum;
 136                 }
 137                 if (isdigit(*p))
 138                         continue;
 139                 switch (*p) {
 140                 case '.':
 141                         if (fraction != NULL)
 142                                 goto badnum;
 143                         fraction = p + 1;
 144                         *p = '\0';
 145                         break;
 146                 case '-':
 147                         if (p == line)
 148                                 break;
 149                         /* FALLTHROUGH */
 150                 default:
 151 badnum:                 errx(1, "illegal number: %s", line);
 152                         break;
 153                 }
 154         }
 155         *p = '\0';
 156
 157         if ((len = strlen(line)) > MAXNUM ||
 158             (fraction != NULL && ((flen = strlen(fraction)) > MAXNUM)))
 159                 errx(1, "number too large, max %d digits.", MAXNUM);
 160
 161         if (*line == '-') {
 162                 (void)printf("minus%s", lflag ? " " : "\n");
 163                 ++line;
 164                 --len;
 165         }
 166
 167         rval = len > 0 ? unit(len, line) : 0;
 168         if (fraction != NULL && flen != 0)
 169                 for (p = fraction; *p != '\0'; ++p)
 170                         if (*p != '0') {
 171                                 if (rval)
 172                                         (void)printf("%sand%s",
 173                                             lflag ? " " : "",
 174                                             lflag ? " " : "\n");
 175                                 if (unit(flen, fraction)) {
 176                                         if (lflag)
 177                                                 (void)printf(" ");
 178                                         pfract(flen);
 179                                         rval = 1;
 180                                 }
 181                                 break;
 182                         }
 183         if (!rval)
 184                 (void)printf("zero%s", lflag ? "" : ".\n");
 185         if (lflag)
 186                 (void)printf("\n");
 187 }
 188
 189 int
 190 unit(len, p)
 191         int len;
 192         char *p;
 193 {
 194         int off, rval;
 195
 196         rval = 0;
 197         if (len > 3) {
 198                 if (len % 3) {
 199                         off = len % 3;
 200                         len -= off;
 201                         if (number(p, off)) {
 202                                 rval = 1;
 203                                 (void)printf(" %s%s",
 204                                     name3[len / 3], lflag ? " " : ".\n");
 205                         }
 206                         p += off;
 207                 }
 208                 for (; len > 3; p += 3) {
 209                         len -= 3;
 210                         if (number(p, 3)) {
 211                                 rval = 1;
 212                                 (void)printf(" %s%s",
 213                                     name3[len / 3], lflag ? " " : ".\n");
 214                         }
 215                 }
 216         }
 217         if (number(p, len)) {
 218                 if (!lflag)
 219                         (void)printf(".\n");
 220                 rval = 1;
 221         }
 222         return (rval);
 223 }
 224
 225 int
 226 number(p, len)
 227         char *p;
 228         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(len)
 267         int len;
 268 {
 269         static char *pref[] = { "", "ten-", "hundred-" };
 270
 271         switch(len) {
 272         case 1:
 273                 (void)printf("tenths.\n");
 274                 break;
 275         case 2:
 276                 (void)printf("hundredths.\n");
 277                 break;
 278         default:
 279                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 280                 break;
 281         }
 282 }
 283
 284 void
 285 usage()
 286 {
 287         (void)fprintf(stderr, "usage: number [# ...]\n");
 288         exit(1);
 289 }