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 1.4 2005/04/25 16:10:24 liamfoy 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(int argc, char **argv)
  83 {
  84         int ch, first;
  85         char line[256];
  86
  87         lflag = 0;
  88         while ((ch = getopt(argc, argv, "l")) != -1)
  89                 switch (ch) {
  90                 case 'l':
  91                         lflag = 1;
  92                         break;
  93                 case '?':
  94                 default:
  95                         usage();
  96                 }
  97         argc -= optind;
  98         argv += optind;
  99
 100         if (*argv == NULL)
 101                 for (first = 1;
 102                     fgets(line, sizeof(line), stdin) != NULL; first = 0) {
 103                         if (strchr(line, '\n') == NULL)
 104                                 errx(1, "line too long.");
 105                         if (!first)
 106                                 (void)printf("...\n");
 107                         convert(line);
 108                 }
 109         else
 110                 for (first = 1; *argv != NULL; first = 0, ++argv) {
 111                         if (!first)
 112                                 (void)printf("...\n");
 113                         convert(*argv);
 114                 }
 115         exit(0);
 116 }
 117
 118 void
 119 convert(char *line)
 120 {
 121         int flen, len, rval;
 122         char *p, *fraction;
 123
 124         flen = NULL;
 125         fraction = NULL;
 126         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 127                 if (isblank(*p)) {
 128                         if (p == line) {
 129                                 ++line;
 130                                 continue;
 131                         }
 132                         goto badnum;
 133                 }
 134                 if (isdigit(*p))
 135                         continue;
 136                 switch (*p) {
 137                 case '.':
 138                         if (fraction != NULL)
 139                                 goto badnum;
 140                         fraction = p + 1;
 141                         *p = '\0';
 142                         break;
 143                 case '-':
 144                         if (p == line)
 145                                 break;
 146                         /* FALLTHROUGH */
 147                 default:
 148 badnum:                 errx(1, "illegal number: %s", line);
 149                         break;
 150                 }
 151         }
 152         *p = '\0';
 153
 154         if ((len = strlen(line)) > MAXNUM ||
 155             (fraction != NULL && ((flen = strlen(fraction)) > MAXNUM)))
 156                 errx(1, "number too large, max %d digits.", MAXNUM);
 157
 158         if (*line == '-') {
 159                 (void)printf("minus%s", lflag ? " " : "\n");
 160                 ++line;
 161                 --len;
 162         }
 163
 164         rval = len > 0 ? unit(len, line) : 0;
 165         if (fraction != NULL && flen != 0)
 166                 for (p = fraction; *p != '\0'; ++p)
 167                         if (*p != '0') {
 168                                 if (rval)
 169                                         (void)printf("%sand%s",
 170                                             lflag ? " " : "",
 171                                             lflag ? " " : "\n");
 172                                 if (unit(flen, fraction)) {
 173                                         if (lflag)
 174                                                 (void)printf(" ");
 175                                         pfract(flen);
 176                                         rval = 1;
 177                                 }
 178                                 break;
 179                         }
 180         if (!rval)
 181                 (void)printf("zero%s", lflag ? "" : ".\n");
 182         if (lflag)
 183                 (void)printf("\n");
 184 }
 185
 186 int
 187 unit(int len, char *p)
 188 {
 189         int off, rval;
 190
 191         rval = 0;
 192         if (len > 3) {
 193                 if (len % 3) {
 194                         off = len % 3;
 195                         len -= off;
 196                         if (number(p, off)) {
 197                                 rval = 1;
 198                                 (void)printf(" %s%s",
 199                                     name3[len / 3], lflag ? " " : ".\n");
 200                         }
 201                         p += off;
 202                 }
 203                 for (; len > 3; p += 3) {
 204                         len -= 3;
 205                         if (number(p, 3)) {
 206                                 rval = 1;
 207                                 (void)printf(" %s%s",
 208                                     name3[len / 3], lflag ? " " : ".\n");
 209                         }
 210                 }
 211         }
 212         if (number(p, len)) {
 213                 if (!lflag)
 214                         (void)printf(".\n");
 215                 rval = 1;
 216         }
 217         return (rval);
 218 }
 219
 220 int
 221 number(char *p, int len)
 222 {
 223         int val, rval;
 224
 225         rval = 0;
 226         switch (len) {
 227         case 3:
 228                 if (*p != '0') {
 229                         rval = 1;
 230                         (void)printf("%s hundred", name1[*p - '0']);
 231                 }
 232                 ++p;
 233                 /* FALLTHROUGH */
 234         case 2:
 235                 val = (p[1] - '0') + (p[0] - '0') * 10;
 236                 if (val) {
 237                         if (rval)
 238                                 (void)printf(" ");
 239                         if (val < 20)
 240                                 (void)printf("%s", name1[val]);
 241                         else {
 242                                 (void)printf("%s", name2[val / 10]);
 243                                 if (val % 10)
 244                                         (void)printf("-%s", name1[val % 10]);
 245                         }
 246                         rval = 1;
 247                 }
 248                 break;
 249         case 1:
 250                 if (*p != '0') {
 251                         rval = 1;
 252                         (void)printf("%s", name1[*p - '0']);
 253                 }
 254         }
 255         return (rval);
 256 }
 257
 258 void
 259 pfract(int len)
 260 {
 261         static const char *pref[] = { "", "ten-", "hundred-" };
 262
 263         switch(len) {
 264         case 1:
 265                 (void)printf("tenths.\n");
 266                 break;
 267         case 2:
 268                 (void)printf("hundredths.\n");
 269                 break;
 270         default:
 271                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 272                 break;
 273         }
 274 }
 275
 276 void
 277 usage(void)
 278 {
 279         (void)fprintf(stderr, "usage: number [# ...]\n");
 280         exit(1);
 281 }