number/number.c

   1 /*      $NetBSD: number.c,v 1.6 1998/09/13 15:24:57 hubertf 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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\n\
  39         The Regents of the University of California.  All rights reserved.\n");
  40 #endif /* not lint */
  41
  42 #ifndef lint
  43 #if 0
  44 static char sccsid[] = "@(#)number.c    8.3 (Berkeley) 5/4/95";
  45 #else
  46 __RCSID("$NetBSD: number.c,v 1.6 1998/09/13 15:24:57 hubertf Exp $");
  47 #endif
  48 #endif /* not lint */
  49
  50 #include <sys/types.h>
  51
  52 #include <ctype.h>
  53 #include <err.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58
  59 #define MAXNUM          65              /* Biggest number we handle. */
  60
  61 static char     *name1[] = {
  62         "",             "one",          "two",          "three",
  63         "four",         "five",         "six",          "seven",
  64         "eight",        "nine",         "ten",          "eleven",
  65         "twelve",       "thirteen",     "fourteen",     "fifteen",
  66         "sixteen",      "seventeen",    "eighteen",     "nineteen",
  67 },
  68                 *name2[] = {
  69         "",             "ten",          "twenty",       "thirty",
  70         "forty",        "fifty",        "sixty",        "seventy",
  71         "eighty",       "ninety",
  72 },
  73                 *name3[] = {
  74         "hundred",      "thousand",     "million",      "billion",
  75         "trillion",     "quadrillion",  "quintillion",  "sextillion",
  76         "septillion",   "octillion",    "nonillion",    "decillion",
  77         "undecillion",  "duodecillion", "tredecillion", "quattuordecillion",
  78         "quindecillion",                "sexdecillion",
  79         "septendecillion",              "octodecillion",
  80         "novemdecillion",               "vigintillion",
  81 };
  82
  83 void    convert __P((char *));
  84 int     main __P((int, char *[]));
  85 int     number __P((char *, int));
  86 void    pfract __P((int));
  87 void    toobig __P((void));
  88 int     unit __P((int, char *));
  89 void    usage __P((void)) __attribute__((__noreturn__));
  90
  91 int lflag;
  92
  93 int
  94 main(argc, argv)
  95         int argc;
  96         char *argv[];
  97 {
  98         int ch, first;
  99         char line[256];
 100
 101         lflag = 0;
 102         while ((ch = getopt(argc, argv, "l")) != -1)
 103                 switch (ch) {
 104                 case 'l':
 105                         lflag = 1;
 106                         break;
 107                 case '?':
 108                 default:
 109                         usage();
 110                 }
 111         argc -= optind;
 112         argv += optind;
 113
 114         if (*argv == NULL)
 115                 for (first = 1;
 116                     fgets(line, sizeof(line), stdin) != NULL; first = 0) {
 117                         if (strchr(line, '\n') == NULL)
 118                                 errx(1, "line too long.");
 119                         if (!first)
 120                                 (void)printf("...\n");
 121                         convert(line);
 122                 }
 123         else
 124                 for (first = 1; *argv != NULL; first = 0, ++argv) {
 125                         if (!first)
 126                                 (void)printf("...\n");
 127                         convert(*argv);
 128                 }
 129         exit(0);
 130 }
 131
 132 void
 133 convert(line)
 134         char *line;
 135 {
 136         int flen, len, rval;
 137         char *p, *fraction;
 138
 139         flen = 0;
 140         fraction = NULL;
 141         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 142                 if (isblank(*p)) {
 143                         if (p == line) {
 144                                 ++line;
 145                                 continue;
 146                         }
 147                         goto badnum;
 148                 }
 149                 if (isdigit(*p))
 150                         continue;
 151                 switch (*p) {
 152                 case '.':
 153                         if (fraction != NULL)
 154                                 goto badnum;
 155                         fraction = p + 1;
 156                         *p = '\0';
 157                         break;
 158                 case '-':
 159                         if (p == line)
 160                                 break;
 161                         /* FALLTHROUGH */
 162                 default:
 163 badnum:                 errx(1, "illegal number: %s", line);
 164                         break;
 165                 }
 166         }
 167         *p = '\0';
 168
 169         if ((len = strlen(line)) > MAXNUM ||
 170             (fraction != NULL && (flen = strlen(fraction)) > MAXNUM))
 171                 errx(1, "number too large, max %d digits.", MAXNUM);
 172
 173         if (*line == '-') {
 174                 (void)printf("minus%s", lflag ? " " : "\n");
 175                 ++line;
 176                 --len;
 177         }
 178
 179         rval = len > 0 ? unit(len, line) : 0;
 180         if (fraction != NULL && flen != 0)
 181                 for (p = fraction; *p != '\0'; ++p)
 182                         if (*p != '0') {
 183                                 if (rval)
 184                                         (void)printf("%sand%s",
 185                                             lflag ? " " : "",
 186                                             lflag ? " " : "\n");
 187                                 if (unit(flen, fraction)) {
 188                                         if (lflag)
 189                                                 (void)printf(" ");
 190                                         pfract(flen);
 191                                         rval = 1;
 192                                 }
 193                                 break;
 194                         }
 195         if (!rval)
 196                 (void)printf("zero%s", lflag ? "" : ".\n");
 197         if (lflag)
 198                 (void)printf("\n");
 199 }
 200
 201 int
 202 unit(len, p)
 203         int len;
 204         char *p;
 205 {
 206         int off, rval;
 207
 208         rval = 0;
 209         if (len > 3) {
 210                 if (len % 3) {
 211                         off = len % 3;
 212                         len -= off;
 213                         if (number(p, off)) {
 214                                 rval = 1;
 215                                 (void)printf(" %s%s",
 216                                     name3[len / 3], lflag ? " " : ".\n");
 217                         }
 218                         p += off;
 219                 }
 220                 for (; len > 3; p += 3) {
 221                         len -= 3;
 222                         if (number(p, 3)) {
 223                                 rval = 1;
 224                                 (void)printf(" %s%s",
 225                                     name3[len / 3], lflag ? " " : ".\n");
 226                         }
 227                 }
 228         }
 229         if (number(p, len)) {
 230                 if (!lflag)
 231                         (void)printf(".\n");
 232                 rval = 1;
 233         }
 234         return (rval);
 235 }
 236
 237 int
 238 number(p, len)
 239         char *p;
 240         int len;
 241 {
 242         int val, rval;
 243
 244         rval = 0;
 245         switch (len) {
 246         case 3:
 247                 if (*p != '0') {
 248                         rval = 1;
 249                         (void)printf("%s hundred", name1[*p - '0']);
 250                 }
 251                 ++p;
 252                 /* FALLTHROUGH */
 253         case 2:
 254                 val = (p[1] - '0') + (p[0] - '0') * 10;
 255                 if (val) {
 256                         if (rval)
 257                                 (void)printf(" ");
 258                         if (val < 20)
 259                                 (void)printf("%s", name1[val]);
 260                         else {
 261                                 (void)printf("%s", name2[val / 10]);
 262                                 if (val % 10)
 263                                         (void)printf("-%s", name1[val % 10]);
 264                         }
 265                         rval = 1;
 266                 }
 267                 break;
 268         case 1:
 269                 if (*p != '0') {
 270                         rval = 1;
 271                         (void)printf("%s", name1[*p - '0']);
 272                 }
 273         }
 274         return (rval);
 275 }
 276
 277 void
 278 pfract(len)
 279         int len;
 280 {
 281         static char *pref[] = { "", "ten-", "hundred-" };
 282
 283         switch(len) {
 284         case 1:
 285                 (void)printf("tenths.\n");
 286                 break;
 287         case 2:
 288                 (void)printf("hundredths.\n");
 289                 break;
 290         default:
 291                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 292                 break;
 293         }
 294 }
 295
 296 void
 297 usage()
 298 {
 299         (void)fprintf(stderr, "usage: number [# ...]\n");
 300         exit(1);
 301 }