games/number/number.c

   1 /*      $NetBSD: number.c,v 1.12 2008/07/20 01:03:21 lukem 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 1.12 2008/07/20 01:03:21 lukem 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(argc, argv)
  90         int argc;
  91         char *argv[];
  92 {
  93         int ch, first;
  94         char line[256];
  95
  96         lflag = 0;
  97         while ((ch = getopt(argc, argv, "l")) != -1)
  98                 switch (ch) {
  99                 case 'l':
 100                         lflag = 1;
 101                         break;
 102                 case '?':
 103                 default:
 104                         usage();
 105                 }
 106         argc -= optind;
 107         argv += optind;
 108
 109         if (*argv == NULL)
 110                 for (first = 1;
 111                     fgets(line, sizeof(line), stdin) != NULL; first = 0) {
 112                         if (strchr(line, '\n') == NULL)
 113                                 errx(1, "line too long.");
 114                         if (!first)
 115                                 (void)printf("...\n");
 116                         convert(line);
 117                 }
 118         else
 119                 for (first = 1; *argv != NULL; first = 0, ++argv) {
 120                         if (!first)
 121                                 (void)printf("...\n");
 122                         convert(*argv);
 123                 }
 124         exit(0);
 125 }
 126
 127 void
 128 convert(line)
 129         char *line;
 130 {
 131         int flen, len, rval;
 132         char *p, *fraction;
 133
 134         flen = 0;
 135         fraction = NULL;
 136         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 137                 if (isblank(*p)) {
 138                         if (p == line) {
 139                                 ++line;
 140                                 continue;
 141                         }
 142                         goto badnum;
 143                 }
 144                 if (isdigit((unsigned char)*p))
 145                         continue;
 146                 switch (*p) {
 147                 case '.':
 148                         if (fraction != NULL)
 149                                 goto badnum;
 150                         fraction = p + 1;
 151                         *p = '\0';
 152                         break;
 153                 case '-':
 154                         if (p == line)
 155                                 break;
 156                         /* FALLTHROUGH */
 157                 default:
 158 badnum:                 errx(1, "illegal number: %s", line);
 159                         break;
 160                 }
 161         }
 162         *p = '\0';
 163
 164         if ((len = strlen(line)) > MAXNUM ||
 165             (fraction != NULL && (flen = strlen(fraction)) > MAXNUM))
 166                 errx(1, "number too large, max %d digits.", MAXNUM);
 167
 168         if (*line == '-') {
 169                 (void)printf("minus%s", lflag ? " " : "\n");
 170                 ++line;
 171                 --len;
 172         }
 173
 174         rval = len > 0 ? unit(len, line) : 0;
 175         if (fraction != NULL && flen != 0)
 176                 for (p = fraction; *p != '\0'; ++p)
 177                         if (*p != '0') {
 178                                 if (rval)
 179                                         (void)printf("%sand%s",
 180                                             lflag ? " " : "",
 181                                             lflag ? " " : "\n");
 182                                 if (unit(flen, fraction)) {
 183                                         if (lflag)
 184                                                 (void)printf(" ");
 185                                         pfract(flen);
 186                                         rval = 1;
 187                                 }
 188                                 break;
 189                         }
 190         if (!rval)
 191                 (void)printf("zero%s", lflag ? "" : ".\n");
 192         if (lflag)
 193                 (void)printf("\n");
 194 }
 195
 196 int
 197 unit(len, p)
 198         int len;
 199         const char *p;
 200 {
 201         int off, rval;
 202
 203         rval = 0;
 204         if (len > 3) {
 205                 if (len % 3) {
 206                         off = len % 3;
 207                         len -= off;
 208                         if (number(p, off)) {
 209                                 rval = 1;
 210                                 (void)printf(" %s%s",
 211                                     name3[len / 3], lflag ? " " : ".\n");
 212                         }
 213                         p += off;
 214                 }
 215                 for (; len > 3; p += 3) {
 216                         len -= 3;
 217                         if (number(p, 3)) {
 218                                 rval = 1;
 219                                 (void)printf(" %s%s",
 220                                     name3[len / 3], lflag ? " " : ".\n");
 221                         }
 222                 }
 223         }
 224         if (number(p, len)) {
 225                 if (!lflag)
 226                         (void)printf(".\n");
 227                 rval = 1;
 228         }
 229         return (rval);
 230 }
 231
 232 int
 233 number(p, len)
 234         const char *p;
 235         int len;
 236 {
 237         int val, rval;
 238
 239         rval = 0;
 240         switch (len) {
 241         case 3:
 242                 if (*p != '0') {
 243                         rval = 1;
 244                         (void)printf("%s hundred", name1[*p - '0']);
 245                 }
 246                 ++p;
 247                 /* FALLTHROUGH */
 248         case 2:
 249                 val = (p[1] - '0') + (p[0] - '0') * 10;
 250                 if (val) {
 251                         if (rval)
 252                                 (void)printf(" ");
 253                         if (val < 20)
 254                                 (void)printf("%s", name1[val]);
 255                         else {
 256                                 (void)printf("%s", name2[val / 10]);
 257                                 if (val % 10)
 258                                         (void)printf("-%s", name1[val % 10]);
 259                         }
 260                         rval = 1;
 261                 }
 262                 break;
 263         case 1:
 264                 if (*p != '0') {
 265                         rval = 1;
 266                         (void)printf("%s", name1[*p - '0']);
 267                 }
 268         }
 269         return (rval);
 270 }
 271
 272 void
 273 pfract(len)
 274         int len;
 275 {
 276         static const char *const pref[] = { "", "ten-", "hundred-" };
 277
 278         switch(len) {
 279         case 1:
 280                 (void)printf("tenths.\n");
 281                 break;
 282         case 2:
 283                 (void)printf("hundredths.\n");
 284                 break;
 285         default:
 286                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 287                 break;
 288         }
 289 }
 290
 291 void
 292 usage()
 293 {
 294         (void)fprintf(stderr, "usage: number [# ...]\n");
 295         exit(1);
 296 }