games/number/number.c

   1 /*      $NetBSD: number.c,v 1.15 2012/06/19 05:46:09 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 1.15 2012/06/19 05:46:09 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 *, int);
  82 static void pfract(int);
  83 static int unit(int, 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         int flen, len, rval;
 129         char *p, *fraction;
 130
 131         flen = 0;
 132         fraction = NULL;
 133         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 134                 if (isblank((unsigned char)*p)) {
 135                         if (p == line) {
 136                                 ++line;
 137                                 continue;
 138                         }
 139                         goto badnum;
 140                 }
 141                 if (isdigit((unsigned char)*p))
 142                         continue;
 143                 switch (*p) {
 144                 case '.':
 145                         if (fraction != NULL)
 146                                 goto badnum;
 147                         fraction = p + 1;
 148                         *p = '\0';
 149                         break;
 150                 case '-':
 151                         if (p == line)
 152                                 break;
 153                         /* FALLTHROUGH */
 154                 default:
 155 badnum:                 errx(1, "illegal number: %s", line);
 156                         break;
 157                 }
 158         }
 159         *p = '\0';
 160
 161         if ((len = strlen(line)) > MAXNUM ||
 162             (fraction != NULL && (flen = strlen(fraction)) > MAXNUM))
 163                 errx(1, "number too large, max %d digits.", MAXNUM);
 164
 165         if (*line == '-') {
 166                 (void)printf("minus%s", lflag ? " " : "\n");
 167                 ++line;
 168                 --len;
 169         }
 170
 171         rval = len > 0 ? unit(len, line) : 0;
 172         if (fraction != NULL && flen != 0)
 173                 for (p = fraction; *p != '\0'; ++p)
 174                         if (*p != '0') {
 175                                 if (rval)
 176                                         (void)printf("%sand%s",
 177                                             lflag ? " " : "",
 178                                             lflag ? " " : "\n");
 179                                 if (unit(flen, fraction)) {
 180                                         if (lflag)
 181                                                 (void)printf(" ");
 182                                         pfract(flen);
 183                                         rval = 1;
 184                                 }
 185                                 break;
 186                         }
 187         if (!rval)
 188                 (void)printf("zero%s", lflag ? "" : ".\n");
 189         if (lflag)
 190                 (void)printf("\n");
 191 }
 192
 193 int
 194 unit(int len, const char *p)
 195 {
 196         int off, rval;
 197
 198         rval = 0;
 199         if (len > 3) {
 200                 if (len % 3) {
 201                         off = len % 3;
 202                         len -= off;
 203                         if (number(p, off)) {
 204                                 rval = 1;
 205                                 (void)printf(" %s%s",
 206                                     name3[len / 3], lflag ? " " : ".\n");
 207                         }
 208                         p += off;
 209                 }
 210                 for (; len > 3; p += 3) {
 211                         len -= 3;
 212                         if (number(p, 3)) {
 213                                 rval = 1;
 214                                 (void)printf(" %s%s",
 215                                     name3[len / 3], lflag ? " " : ".\n");
 216                         }
 217                 }
 218         }
 219         if (number(p, len)) {
 220                 if (!lflag)
 221                         (void)printf(".\n");
 222                 rval = 1;
 223         }
 224         return (rval);
 225 }
 226
 227 int
 228 number(const char *p, 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(int len)
 267 {
 268         static const char *const pref[] = { "", "ten-", "hundred-" };
 269
 270         switch(len) {
 271         case 1:
 272                 (void)printf("tenths.\n");
 273                 break;
 274         case 2:
 275                 (void)printf("hundredths.\n");
 276                 break;
 277         default:
 278                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 279                 break;
 280         }
 281 }
 282
 283 void
 284 usage(void)
 285 {
 286         (void)fprintf(stderr, "usage: number [# ...]\n");
 287         exit(1);
 288 }