number/number.c

   1 /*      $NetBSD: number.c,v 1.7 1999/09/08 21:17:53 jsm 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 1.7 1999/09/08 21:17:53 jsm 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 const char       *const 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                 *const name2[] = {
  69         "",             "ten",          "twenty",       "thirty",
  70         "forty",        "fifty",        "sixty",        "seventy",
  71         "eighty",       "ninety",
  72 },
  73                 *const 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((const char *, int));
  86 void    pfract __P((int));
  87 int     unit __P((int, const char *));
  88 void    usage __P((void)) __attribute__((__noreturn__));
  89
  90 int lflag;
  91
  92 int
  93 main(argc, argv)
  94         int argc;
  95         char *argv[];
  96 {
  97         int ch, first;
  98         char line[256];
  99
 100         lflag = 0;
 101         while ((ch = getopt(argc, argv, "l")) != -1)
 102                 switch (ch) {
 103                 case 'l':
 104                         lflag = 1;
 105                         break;
 106                 case '?':
 107                 default:
 108                         usage();
 109                 }
 110         argc -= optind;
 111         argv += optind;
 112
 113         if (*argv == NULL)
 114                 for (first = 1;
 115                     fgets(line, sizeof(line), stdin) != NULL; first = 0) {
 116                         if (strchr(line, '\n') == NULL)
 117                                 errx(1, "line too long.");
 118                         if (!first)
 119                                 (void)printf("...\n");
 120                         convert(line);
 121                 }
 122         else
 123                 for (first = 1; *argv != NULL; first = 0, ++argv) {
 124                         if (!first)
 125                                 (void)printf("...\n");
 126                         convert(*argv);
 127                 }
 128         exit(0);
 129 }
 130
 131 void
 132 convert(line)
 133         char *line;
 134 {
 135         int flen, len, rval;
 136         char *p, *fraction;
 137
 138         flen = 0;
 139         fraction = NULL;
 140         for (p = line; *p != '\0' && *p != '\n'; ++p) {
 141                 if (isblank(*p)) {
 142                         if (p == line) {
 143                                 ++line;
 144                                 continue;
 145                         }
 146                         goto badnum;
 147                 }
 148                 if (isdigit(*p))
 149                         continue;
 150                 switch (*p) {
 151                 case '.':
 152                         if (fraction != NULL)
 153                                 goto badnum;
 154                         fraction = p + 1;
 155                         *p = '\0';
 156                         break;
 157                 case '-':
 158                         if (p == line)
 159                                 break;
 160                         /* FALLTHROUGH */
 161                 default:
 162 badnum:                 errx(1, "illegal number: %s", line);
 163                         break;
 164                 }
 165         }
 166         *p = '\0';
 167
 168         if ((len = strlen(line)) > MAXNUM ||
 169             (fraction != NULL && (flen = strlen(fraction)) > MAXNUM))
 170                 errx(1, "number too large, max %d digits.", MAXNUM);
 171
 172         if (*line == '-') {
 173                 (void)printf("minus%s", lflag ? " " : "\n");
 174                 ++line;
 175                 --len;
 176         }
 177
 178         rval = len > 0 ? unit(len, line) : 0;
 179         if (fraction != NULL && flen != 0)
 180                 for (p = fraction; *p != '\0'; ++p)
 181                         if (*p != '0') {
 182                                 if (rval)
 183                                         (void)printf("%sand%s",
 184                                             lflag ? " " : "",
 185                                             lflag ? " " : "\n");
 186                                 if (unit(flen, fraction)) {
 187                                         if (lflag)
 188                                                 (void)printf(" ");
 189                                         pfract(flen);
 190                                         rval = 1;
 191                                 }
 192                                 break;
 193                         }
 194         if (!rval)
 195                 (void)printf("zero%s", lflag ? "" : ".\n");
 196         if (lflag)
 197                 (void)printf("\n");
 198 }
 199
 200 int
 201 unit(len, p)
 202         int len;
 203         const char *p;
 204 {
 205         int off, rval;
 206
 207         rval = 0;
 208         if (len > 3) {
 209                 if (len % 3) {
 210                         off = len % 3;
 211                         len -= off;
 212                         if (number(p, off)) {
 213                                 rval = 1;
 214                                 (void)printf(" %s%s",
 215                                     name3[len / 3], lflag ? " " : ".\n");
 216                         }
 217                         p += off;
 218                 }
 219                 for (; len > 3; p += 3) {
 220                         len -= 3;
 221                         if (number(p, 3)) {
 222                                 rval = 1;
 223                                 (void)printf(" %s%s",
 224                                     name3[len / 3], lflag ? " " : ".\n");
 225                         }
 226                 }
 227         }
 228         if (number(p, len)) {
 229                 if (!lflag)
 230                         (void)printf(".\n");
 231                 rval = 1;
 232         }
 233         return (rval);
 234 }
 235
 236 int
 237 number(p, len)
 238         const char *p;
 239         int len;
 240 {
 241         int val, rval;
 242
 243         rval = 0;
 244         switch (len) {
 245         case 3:
 246                 if (*p != '0') {
 247                         rval = 1;
 248                         (void)printf("%s hundred", name1[*p - '0']);
 249                 }
 250                 ++p;
 251                 /* FALLTHROUGH */
 252         case 2:
 253                 val = (p[1] - '0') + (p[0] - '0') * 10;
 254                 if (val) {
 255                         if (rval)
 256                                 (void)printf(" ");
 257                         if (val < 20)
 258                                 (void)printf("%s", name1[val]);
 259                         else {
 260                                 (void)printf("%s", name2[val / 10]);
 261                                 if (val % 10)
 262                                         (void)printf("-%s", name1[val % 10]);
 263                         }
 264                         rval = 1;
 265                 }
 266                 break;
 267         case 1:
 268                 if (*p != '0') {
 269                         rval = 1;
 270                         (void)printf("%s", name1[*p - '0']);
 271                 }
 272         }
 273         return (rval);
 274 }
 275
 276 void
 277 pfract(len)
 278         int len;
 279 {
 280         static const char *const pref[] = { "", "ten-", "hundred-" };
 281
 282         switch(len) {
 283         case 1:
 284                 (void)printf("tenths.\n");
 285                 break;
 286         case 2:
 287                 (void)printf("hundredths.\n");
 288                 break;
 289         default:
 290                 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
 291                 break;
 292         }
 293 }
 294
 295 void
 296 usage()
 297 {
 298         (void)fprintf(stderr, "usage: number [# ...]\n");
 299         exit(1);
 300 }