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
  34 #ifndef lint
  35 static char copyright[] =
  36 "@(#) Copyright (c) 1988, 1993, 1994\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 static char sccsid[] = "@(#)number.c    8.3 (Berkeley) 5/4/95";
  42 #endif /* not lint */
  43
  44 #include <sys/types.h>
  45
  46 #include <ctype.h>
  47 #include <err.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 #define MAXNUM          65              /* Biggest number we handle. */
  54
  55 static char     *name1[] = {
  56         "",             "one",          "two",          "three",
  57         "four",         "five",         "six",          "seven",
  58         "eight",        "nine",         "ten",          "eleven",
  59         "twelve",       "thirteen",     "fourteen",     "fifteen",
  60         "sixteen",      "seventeen",    "eighteen",     "nineteen",
  61 },
  62                 *name2[] = {
  63         "",             "ten",          "twenty",       "thirty",
  64         "forty",        "fifty",        "sixty",        "seventy",
  65         "eighty",       "ninety",
  66 },
  67                 *name3[] = {
  68         "hundred",      "thousand",     "million",      "billion",
  69         "trillion",     "quadrillion",  "quintillion",  "sextillion",
  70         "septillion",   "octillion",    "nonillion",    "decillion",
  71         "undecillion",  "duodecillion", "tredecillion", "quattuordecillion",
  72         "quindecillion",                "sexdecillion",
  73         "septendecillion",              "octodecillion",
  74         "novemdecillion",               "vigintillion",
  75 };
  76
  77 void    convert __P((char *));
  78 int     number __P((char *, int));
  79 void    pfract __P((int));
  80 void    toobig __P((void));
  81 int     unit __P((int, char *));
  82 void    usage __P((void));
  83
  84 int lflag;
  85
  86 int
  87 main(argc, argv)
  88         int argc;
  89         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(line)
 127         char *line;
 128 {
 129         register flen, len, rval;
 130         register char *p, *fraction;
 131
 132         fraction = NULL;
 133         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 134                 if (isblank(*p)) {
 135                         if (p == line) {
 136                                 ++line;
 137                                 continue;
 138                         }
 139                         goto badnum;
 140                 }
 141                 if (isdigit(*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(len, p)
 195         register int len;
 196         register char *p;
 197 {
 198         register int off, 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(p, len)
 231         register char *p;
 232         int len;
 233 {
 234         register int val, rval;
 235
 236         rval = 0;
 237         switch (len) {
 238         case 3:
 239                 if (*p != '0') {
 240                         rval = 1;
 241                         (void)printf("%s hundred", name1[*p - '0']);
 242                 }
 243                 ++p;
 244                 /* FALLTHROUGH */
 245         case 2:
 246                 val = (p[1] - '0') + (p[0] - '0') * 10;
 247                 if (val) {
 248                         if (rval)
 249                                 (void)printf(" ");
 250                         if (val < 20)
 251                                 (void)printf("%s", name1[val]);
 252                         else {
 253                                 (void)printf("%s", name2[val / 10]);
 254                                 if (val % 10)
 255                                         (void)printf("-%s", name1[val % 10]);
 256                         }
 257                         rval = 1;
 258                 }
 259                 break;
 260         case 1:
 261                 if (*p != '0') {
 262                         rval = 1;
 263                         (void)printf("%s", name1[*p - '0']);
 264                 }
 265         }
 266         return (rval);
 267 }
 268
 269 void
 270 pfract(len)
 271         int len;
 272 {
 273         static char *pref[] = { "", "ten-", "hundred-" };
 274
 275         switch(len) {
 276         case 1:
 277                 (void)printf("tenths.\n");
 278                 break;
 279         case 2:
 280                 (void)printf("hundredths.\n");
 281                 break;
 282         default:
 283                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 284                 break;
 285         }
 286 }
 287
 288 void
 289 usage()
 290 {
 291         (void)fprintf(stderr, "usage: number [# ...]\n");
 292         exit(1);
 293 }