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 const 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 #if 0
  42 static char sccsid[] = "@(#)number.c    8.3 (Berkeley) 5/4/95";
  43 #endif
  44 static const char rcsid[] =
  45  "$FreeBSD$";
  46 #endif /* not lint */
  47
  48 #include <sys/types.h>
  49
  50 #include <ctype.h>
  51 #include <err.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <unistd.h>
  56
  57 #define MAXNUM          65              /* Biggest number we handle. */
  58
  59 static const char       *name1[] = {
  60         "",             "one",          "two",          "three",
  61         "four",         "five",         "six",          "seven",
  62         "eight",        "nine",         "ten",          "eleven",
  63         "twelve",       "thirteen",     "fourteen",     "fifteen",
  64         "sixteen",      "seventeen",    "eighteen",     "nineteen",
  65 },
  66                 *name2[] = {
  67         "",             "ten",          "twenty",       "thirty",
  68         "forty",        "fifty",        "sixty",        "seventy",
  69         "eighty",       "ninety",
  70 },
  71                 *name3[] = {
  72         "hundred",      "thousand",     "million",      "billion",
  73         "trillion",     "quadrillion",  "quintillion",  "sextillion",
  74         "septillion",   "octillion",    "nonillion",    "decillion",
  75         "undecillion",  "duodecillion", "tredecillion", "quattuordecillion",
  76         "quindecillion",                "sexdecillion",
  77         "septendecillion",              "octodecillion",
  78         "novemdecillion",               "vigintillion",
  79 };
  80
  81 static void     convert(char *);
  82 static int      number(char *, int);
  83 static void     pfract(int);
  84 static int      unit(int, char *);
  85 static void     usage(void);
  86
  87 static int lflag;
  88
  89 int
  90 main(argc, argv)
  91         int argc;
  92         char *argv[];
  93 {
  94         int ch, first;
  95         char line[256];
  96
  97         lflag = 0;
  98         while ((ch = getopt(argc, argv, "l")) != -1)
  99                 switch (ch) {
 100                 case 'l':
 101                         lflag = 1;
 102                         break;
 103                 case '?':
 104                 default:
 105                         usage();
 106                 }
 107         argc -= optind;
 108         argv += optind;
 109
 110         if (*argv == NULL)
 111                 for (first = 1;
 112                     fgets(line, sizeof(line), stdin) != NULL; first = 0) {
 113                         if (strchr(line, '\n') == NULL)
 114                                 errx(1, "line too long.");
 115                         if (!first)
 116                                 (void)printf("...\n");
 117                         convert(line);
 118                 }
 119         else
 120                 for (first = 1; *argv != NULL; first = 0, ++argv) {
 121                         if (!first)
 122                                 (void)printf("...\n");
 123                         convert(*argv);
 124                 }
 125         exit(0);
 126 }
 127
 128 static void
 129 convert(line)
 130         char *line;
 131 {
 132         int flen, len, rval;
 133         char *p, *fraction;
 134
 135         flen = 0;
 136         fraction = NULL;
 137         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 138                 if (isblank(*p)) {
 139                         if (p == line) {
 140                                 ++line;
 141                                 continue;
 142                         }
 143                         goto badnum;
 144                 }
 145                 if (isdigit(*p))
 146                         continue;
 147                 switch (*p) {
 148                 case '.':
 149                         if (fraction != NULL)
 150                                 goto badnum;
 151                         fraction = p + 1;
 152                         *p = '\0';
 153                         break;
 154                 case '-':
 155                         if (p == line)
 156                                 break;
 157                         /* FALLTHROUGH */
 158                 default:
 159 badnum:                 errx(1, "illegal number: %s", line);
 160                         break;
 161                 }
 162         }
 163         *p = '\0';
 164
 165         if ((len = strlen(line)) > MAXNUM ||
 166             (fraction != NULL && ((flen = strlen(fraction)) > MAXNUM)))
 167                 errx(1, "number too large, max %d digits.", MAXNUM);
 168
 169         if (*line == '-') {
 170                 (void)printf("minus%s", lflag ? " " : "\n");
 171                 ++line;
 172                 --len;
 173         }
 174
 175         rval = len > 0 ? unit(len, line) : 0;
 176         if (fraction != NULL && flen != 0)
 177                 for (p = fraction; *p != '\0'; ++p)
 178                         if (*p != '0') {
 179                                 if (rval)
 180                                         (void)printf("%sand%s",
 181                                             lflag ? " " : "",
 182                                             lflag ? " " : "\n");
 183                                 if (unit(flen, fraction)) {
 184                                         if (lflag)
 185                                                 (void)printf(" ");
 186                                         pfract(flen);
 187                                         rval = 1;
 188                                 }
 189                                 break;
 190                         }
 191         if (!rval)
 192                 (void)printf("zero%s", lflag ? "" : ".\n");
 193         if (lflag)
 194                 (void)printf("\n");
 195 }
 196
 197 static int
 198 unit(len, p)
 199         int len;
 200         char *p;
 201 {
 202         int off, rval;
 203
 204         rval = 0;
 205         if (len > 3) {
 206                 if (len % 3) {
 207                         off = len % 3;
 208                         len -= off;
 209                         if (number(p, off)) {
 210                                 rval = 1;
 211                                 (void)printf(" %s%s",
 212                                     name3[len / 3], lflag ? " " : ".\n");
 213                         }
 214                         p += off;
 215                 }
 216                 for (; len > 3; p += 3) {
 217                         len -= 3;
 218                         if (number(p, 3)) {
 219                                 rval = 1;
 220                                 (void)printf(" %s%s",
 221                                     name3[len / 3], lflag ? " " : ".\n");
 222                         }
 223                 }
 224         }
 225         if (number(p, len)) {
 226                 if (!lflag)
 227                         (void)printf(".\n");
 228                 rval = 1;
 229         }
 230         return (rval);
 231 }
 232
 233 static int
 234 number(p, len)
 235         char *p;
 236         int len;
 237 {
 238         int val, rval;
 239
 240         rval = 0;
 241         switch (len) {
 242         case 3:
 243                 if (*p != '0') {
 244                         rval = 1;
 245                         (void)printf("%s hundred", name1[*p - '0']);
 246                 }
 247                 ++p;
 248                 /* FALLTHROUGH */
 249         case 2:
 250                 val = (p[1] - '0') + (p[0] - '0') * 10;
 251                 if (val) {
 252                         if (rval)
 253                                 (void)printf(" ");
 254                         if (val < 20)
 255                                 (void)printf("%s", name1[val]);
 256                         else {
 257                                 (void)printf("%s", name2[val / 10]);
 258                                 if (val % 10)
 259                                         (void)printf("-%s", name1[val % 10]);
 260                         }
 261                         rval = 1;
 262                 }
 263                 break;
 264         case 1:
 265                 if (*p != '0') {
 266                         rval = 1;
 267                         (void)printf("%s", name1[*p - '0']);
 268                 }
 269         }
 270         return (rval);
 271 }
 272
 273 static void
 274 pfract(len)
 275         int len;
 276 {
 277         static char *pref[] = { "", "ten-", "hundred-" };
 278
 279         switch(len) {
 280         case 1:
 281                 (void)printf("tenths.\n");
 282                 break;
 283         case 2:
 284                 (void)printf("hundredths.\n");
 285                 break;
 286         default:
 287                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 288                 break;
 289         }
 290 }
 291
 292 static void
 293 usage()
 294 {
 295         (void)fprintf(stderr, "usage: number [-l] [# ...]\n");
 296         exit(1);
 297 }