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number.c revision 1.7 
      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 }
    301