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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1988, 1993, 1994\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)number.c    8.3 (Berkeley) 5/4/95";
  39 #endif
  40 static const char rcsid[] =
  41  "$FreeBSD$";
  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 const 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(char *);
  78 int     number(char *, int);
  79 void    pfract(int);
  80 void    toobig(void);
  81 int     unit(int, char *);
  82 void    usage(void);
  83
  84 int lflag;
  85
  86 int
  87 main(int argc, char *argv[])
  88 {
  89         int ch, first;
  90         char line[256];
  91
  92         lflag = 0;
  93         while ((ch = getopt(argc, argv, "l")) != -1)
  94                 switch (ch) {
  95                 case 'l':
  96                         lflag = 1;
  97                         break;
  98                 case '?':
  99                 default:
 100                         usage();
 101                 }
 102         argc -= optind;
 103         argv += optind;
 104
 105         if (*argv == NULL)
 106                 for (first = 1;
 107                     fgets(line, sizeof(line), stdin) != NULL; first = 0) {
 108                         if (strchr(line, '\n') == NULL)
 109                                 errx(1, "line too long.");
 110                         if (!first)
 111                                 (void)printf("...\n");
 112                         convert(line);
 113                 }
 114         else
 115                 for (first = 1; *argv != NULL; first = 0, ++argv) {
 116                         if (!first)
 117                                 (void)printf("...\n");
 118                         convert(*argv);
 119                 }
 120         exit(0);
 121 }
 122
 123 void
 124 convert(char *line)
 125 {
 126         int flen, len, rval;
 127         char *p, *fraction;
 128
 129         flen = 0;
 130         fraction = NULL;
 131         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 132                 if (isblank(*p)) {
 133                         if (p == line) {
 134                                 ++line;
 135                                 continue;
 136                         }
 137                         goto badnum;
 138                 }
 139                 if (isdigit(*p))
 140                         continue;
 141                 switch (*p) {
 142                 case '.':
 143                         if (fraction != NULL)
 144                                 goto badnum;
 145                         fraction = p + 1;
 146                         *p = '\0';
 147                         break;
 148                 case '-':
 149                         if (p == line)
 150                                 break;
 151                         /* FALLTHROUGH */
 152                 default:
 153 badnum:                 errx(1, "illegal number: %s", line);
 154                         break;
 155                 }
 156         }
 157         *p = '\0';
 158
 159         if ((len = strlen(line)) > MAXNUM ||
 160             (fraction != NULL && ((flen = strlen(fraction)) > MAXNUM)))
 161                 errx(1, "number too large, max %d digits.", MAXNUM);
 162
 163         if (*line == '-') {
 164                 (void)printf("minus%s", lflag ? " " : "\n");
 165                 ++line;
 166                 --len;
 167         }
 168
 169         rval = len > 0 ? unit(len, line) : 0;
 170         if (fraction != NULL && flen != 0)
 171                 for (p = fraction; *p != '\0'; ++p)
 172                         if (*p != '0') {
 173                                 if (rval)
 174                                         (void)printf("%sand%s",
 175                                             lflag ? " " : "",
 176                                             lflag ? " " : "\n");
 177                                 if (unit(flen, fraction)) {
 178                                         if (lflag)
 179                                                 (void)printf(" ");
 180                                         pfract(flen);
 181                                         rval = 1;
 182                                 }
 183                                 break;
 184                         }
 185         if (!rval)
 186                 (void)printf("zero%s", lflag ? "" : ".\n");
 187         if (lflag)
 188                 (void)printf("\n");
 189 }
 190
 191 int
 192 unit(int len, char *p)
 193 {
 194         int off, rval;
 195
 196         rval = 0;
 197         if (len > 3) {
 198                 if (len % 3) {
 199                         off = len % 3;
 200                         len -= off;
 201                         if (number(p, off)) {
 202                                 rval = 1;
 203                                 (void)printf(" %s%s",
 204                                     name3[len / 3], lflag ? " " : ".\n");
 205                         }
 206                         p += off;
 207                 }
 208                 for (; len > 3; p += 3) {
 209                         len -= 3;
 210                         if (number(p, 3)) {
 211                                 rval = 1;
 212                                 (void)printf(" %s%s",
 213                                     name3[len / 3], lflag ? " " : ".\n");
 214                         }
 215                 }
 216         }
 217         if (number(p, len)) {
 218                 if (!lflag)
 219                         (void)printf(".\n");
 220                 rval = 1;
 221         }
 222         return (rval);
 223 }
 224
 225 int
 226 number(char *p, int len)
 227 {
 228         int val, rval;
 229
 230         rval = 0;
 231         switch (len) {
 232         case 3:
 233                 if (*p != '0') {
 234                         rval = 1;
 235                         (void)printf("%s hundred", name1[*p - '0']);
 236                 }
 237                 ++p;
 238                 /* FALLTHROUGH */
 239         case 2:
 240                 val = (p[1] - '0') + (p[0] - '0') * 10;
 241                 if (val) {
 242                         if (rval)
 243                                 (void)printf(" ");
 244                         if (val < 20)
 245                                 (void)printf("%s", name1[val]);
 246                         else {
 247                                 (void)printf("%s", name2[val / 10]);
 248                                 if (val % 10)
 249                                         (void)printf("-%s", name1[val % 10]);
 250                         }
 251                         rval = 1;
 252                 }
 253                 break;
 254         case 1:
 255                 if (*p != '0') {
 256                         rval = 1;
 257                         (void)printf("%s", name1[*p - '0']);
 258                 }
 259         }
 260         return (rval);
 261 }
 262
 263 void
 264 pfract(int len)
 265 {
 266         static char const * const pref[] = { "", "ten-", "hundred-" };
 267
 268         switch(len) {
 269         case 1:
 270                 (void)printf("tenths.\n");
 271                 break;
 272         case 2:
 273                 (void)printf("hundredths.\n");
 274                 break;
 275         default:
 276                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 277                 break;
 278         }
 279 }
 280
 281 void
 282 usage(void)
 283 {
 284         (void)fprintf(stderr, "usage: number [-l] [# ...]\n");
 285         exit(1);
 286 }