games/number/number.c

   1 /*      $NetBSD: number.c,v 1.16 2014/03/23 00:03:04 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 1.16 2014/03/23 00:03:04 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 *, size_t);
  82 static void pfract(size_t);
  83 static int unit(size_t, 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         size_t flen, len;
 129         int rval;
 130         char *p, *fraction;
 131
 132         flen = 0;
 133         fraction = NULL;
 134         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 135                 if (isblank((unsigned char)*p)) {
 136                         if (p == line) {
 137                                 ++line;
 138                                 continue;
 139                         }
 140                         goto badnum;
 141                 }
 142                 if (isdigit((unsigned char)*p))
 143                         continue;
 144                 switch (*p) {
 145                 case '.':
 146                         if (fraction != NULL)
 147                                 goto badnum;
 148                         fraction = p + 1;
 149                         *p = '\0';
 150                         break;
 151                 case '-':
 152                         if (p == line)
 153                                 break;
 154                         /* FALLTHROUGH */
 155                 default:
 156 badnum:                 errx(1, "illegal number: %s", line);
 157                         break;
 158                 }
 159         }
 160         *p = '\0';
 161
 162         if ((len = strlen(line)) > MAXNUM ||
 163             (fraction != NULL && (flen = strlen(fraction)) > MAXNUM))
 164                 errx(1, "number too large, max %d digits.", MAXNUM);
 165
 166         if (*line == '-') {
 167                 (void)printf("minus%s", lflag ? " " : "\n");
 168                 ++line;
 169                 --len;
 170         }
 171
 172         rval = len > 0 ? unit(len, line) : 0;
 173         if (fraction != NULL && flen != 0)
 174                 for (p = fraction; *p != '\0'; ++p)
 175                         if (*p != '0') {
 176                                 if (rval)
 177                                         (void)printf("%sand%s",
 178                                             lflag ? " " : "",
 179                                             lflag ? " " : "\n");
 180                                 if (unit(flen, fraction)) {
 181                                         if (lflag)
 182                                                 (void)printf(" ");
 183                                         pfract(flen);
 184                                         rval = 1;
 185                                 }
 186                                 break;
 187                         }
 188         if (!rval)
 189                 (void)printf("zero%s", lflag ? "" : ".\n");
 190         if (lflag)
 191                 (void)printf("\n");
 192 }
 193
 194 int
 195 unit(size_t len, const char *p)
 196 {
 197         size_t off;
 198         int rval;
 199
 200         rval = 0;
 201         if (len > 3) {
 202                 if (len % 3) {
 203                         off = len % 3;
 204                         len -= off;
 205                         if (number(p, off)) {
 206                                 rval = 1;
 207                                 (void)printf(" %s%s",
 208                                     name3[len / 3], lflag ? " " : ".\n");
 209                         }
 210                         p += off;
 211                 }
 212                 for (; len > 3; p += 3) {
 213                         len -= 3;
 214                         if (number(p, 3)) {
 215                                 rval = 1;
 216                                 (void)printf(" %s%s",
 217                                     name3[len / 3], lflag ? " " : ".\n");
 218                         }
 219                 }
 220         }
 221         if (number(p, len)) {
 222                 if (!lflag)
 223                         (void)printf(".\n");
 224                 rval = 1;
 225         }
 226         return (rval);
 227 }
 228
 229 int
 230 number(const char *p, size_t len)
 231 {
 232         int val, rval;
 233
 234         rval = 0;
 235         switch (len) {
 236         case 3:
 237                 if (*p != '0') {
 238                         rval = 1;
 239                         (void)printf("%s hundred", name1[*p - '0']);
 240                 }
 241                 ++p;
 242                 /* FALLTHROUGH */
 243         case 2:
 244                 val = (p[1] - '0') + (p[0] - '0') * 10;
 245                 if (val) {
 246                         if (rval)
 247                                 (void)printf(" ");
 248                         if (val < 20)
 249                                 (void)printf("%s", name1[val]);
 250                         else {
 251                                 (void)printf("%s", name2[val / 10]);
 252                                 if (val % 10)
 253                                         (void)printf("-%s", name1[val % 10]);
 254                         }
 255                         rval = 1;
 256                 }
 257                 break;
 258         case 1:
 259                 if (*p != '0') {
 260                         rval = 1;
 261                         (void)printf("%s", name1[*p - '0']);
 262                 }
 263         }
 264         return (rval);
 265 }
 266
 267 void
 268 pfract(size_t len)
 269 {
 270         static const char *const pref[] = { "", "ten-", "hundred-" };
 271
 272         switch(len) {
 273         case 1:
 274                 (void)printf("tenths.\n");
 275                 break;
 276         case 2:
 277                 (void)printf("hundredths.\n");
 278                 break;
 279         default:
 280                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 281                 break;
 282         }
 283 }
 284
 285 void
 286 usage(void)
 287 {
 288         (void)fprintf(stderr, "usage: number [# ...]\n");
 289         exit(1);
 290 }