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number.c revision 1.9 
      1 /*	$NetBSD: number.c,v 1.9 2004/01/27 20:30:30 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\n\
     35 	The Regents of the University of California.  All rights reserved.\n");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)number.c	8.3 (Berkeley) 5/4/95";
     41 #else
     42 __RCSID("$NetBSD: number.c,v 1.9 2004/01/27 20:30:30 jsm Exp $");
     43 #endif
     44 #endif /* not lint */
     45 
     46 #include <sys/types.h>
     47 
     48 #include <ctype.h>
     49 #include <err.h>
     50 #include <stdio.h>
     51 #include <stdlib.h>
     52 #include <string.h>
     53 #include <unistd.h>
     54 
     55 #define	MAXNUM		65		/* Biggest number we handle. */
     56 
     57 static const char	*const name1[] = {
     58 	"",		"one",		"two",		"three",
     59 	"four",		"five",		"six",		"seven",
     60 	"eight",	"nine",		"ten",		"eleven",
     61 	"twelve",	"thirteen",	"fourteen",	"fifteen",
     62 	"sixteen",	"seventeen",	"eighteen",	"nineteen",
     63 },
     64 		*const name2[] = {
     65 	"",		"ten",		"twenty",	"thirty",
     66 	"forty",	"fifty",	"sixty",	"seventy",
     67 	"eighty",	"ninety",
     68 },
     69 		*const name3[] = {
     70 	"hundred",	"thousand",	"million",	"billion",
     71 	"trillion",	"quadrillion",	"quintillion",	"sextillion",
     72 	"septillion",	"octillion",	"nonillion",	"decillion",
     73 	"undecillion",	"duodecillion",	"tredecillion",	"quattuordecillion",
     74 	"quindecillion",		"sexdecillion",
     75 	"septendecillion",		"octodecillion",
     76 	"novemdecillion",		"vigintillion",
     77 };
     78 
     79 void	convert(char *);
     80 int	main(int, char *[]);
     81 int	number(const char *, int);
     82 void	pfract(int);
     83 int	unit(int, const char *);
     84 void	usage(void) __attribute__((__noreturn__));
     85 
     86 int lflag;
     87 
     88 int
     89 main(argc, argv)
     90 	int argc;
     91 	char *argv[];
     92 {
     93 	int ch, first;
     94 	char line[256];
     95 
     96 	lflag = 0;
     97 	while ((ch = getopt(argc, argv, "l")) != -1)
     98 		switch (ch) {
     99 		case 'l':
    100 			lflag = 1;
    101 			break;
    102 		case '?':
    103 		default:
    104 			usage();
    105 		}
    106 	argc -= optind;
    107 	argv += optind;
    108 
    109 	if (*argv == NULL)
    110 		for (first = 1;
    111 		    fgets(line, sizeof(line), stdin) != NULL; first = 0) {
    112 			if (strchr(line, '\n') == NULL)
    113 				errx(1, "line too long.");
    114 			if (!first)
    115 				(void)printf("...\n");
    116 			convert(line);
    117 		}
    118 	else
    119 		for (first = 1; *argv != NULL; first = 0, ++argv) {
    120 			if (!first)
    121 				(void)printf("...\n");
    122 			convert(*argv);
    123 		}
    124 	exit(0);
    125 }
    126 
    127 void
    128 convert(line)
    129 	char *line;
    130 {
    131 	int flen, len, rval;
    132 	char *p, *fraction;
    133 
    134 	flen = 0;
    135 	fraction = NULL;
    136 	for (p = line; *p != '\0' && *p != '\n'; ++p) {
    137 		if (isblank(*p)) {
    138 			if (p == line) {
    139 				++line;
    140 				continue;
    141 			}
    142 			goto badnum;
    143 		}
    144 		if (isdigit(*p))
    145 			continue;
    146 		switch (*p) {
    147 		case '.':
    148 			if (fraction != NULL)
    149 				goto badnum;
    150 			fraction = p + 1;
    151 			*p = '\0';
    152 			break;
    153 		case '-':
    154 			if (p == line)
    155 				break;
    156 			/* FALLTHROUGH */
    157 		default:
    158 badnum:			errx(1, "illegal number: %s", line);
    159 			break;
    160 		}
    161 	}
    162 	*p = '\0';
    163 
    164 	if ((len = strlen(line)) > MAXNUM ||
    165 	    (fraction != NULL && (flen = strlen(fraction)) > MAXNUM))
    166 		errx(1, "number too large, max %d digits.", MAXNUM);
    167 
    168 	if (*line == '-') {
    169 		(void)printf("minus%s", lflag ? " " : "\n");
    170 		++line;
    171 		--len;
    172 	}
    173 
    174 	rval = len > 0 ? unit(len, line) : 0;
    175 	if (fraction != NULL && flen != 0)
    176 		for (p = fraction; *p != '\0'; ++p)
    177 			if (*p != '0') {
    178 				if (rval)
    179 					(void)printf("%sand%s",
    180 					    lflag ? " " : "",
    181 					    lflag ? " " : "\n");
    182 				if (unit(flen, fraction)) {
    183 					if (lflag)
    184 						(void)printf(" ");
    185 					pfract(flen);
    186 					rval = 1;
    187 				}
    188 				break;
    189 			}
    190 	if (!rval)
    191 		(void)printf("zero%s", lflag ? "" : ".\n");
    192 	if (lflag)
    193 		(void)printf("\n");
    194 }
    195 
    196 int
    197 unit(len, p)
    198 	int len;
    199 	const char *p;
    200 {
    201 	int off, rval;
    202 
    203 	rval = 0;
    204 	if (len > 3) {
    205 		if (len % 3) {
    206 			off = len % 3;
    207 			len -= off;
    208 			if (number(p, off)) {
    209 				rval = 1;
    210 				(void)printf(" %s%s",
    211 				    name3[len / 3], lflag ? " " : ".\n");
    212 			}
    213 			p += off;
    214 		}
    215 		for (; len > 3; p += 3) {
    216 			len -= 3;
    217 			if (number(p, 3)) {
    218 				rval = 1;
    219 				(void)printf(" %s%s",
    220 				    name3[len / 3], lflag ? " " : ".\n");
    221 			}
    222 		}
    223 	}
    224 	if (number(p, len)) {
    225 		if (!lflag)
    226 			(void)printf(".\n");
    227 		rval = 1;
    228 	}
    229 	return (rval);
    230 }
    231 
    232 int
    233 number(p, len)
    234 	const char *p;
    235 	int len;
    236 {
    237 	int val, rval;
    238 
    239 	rval = 0;
    240 	switch (len) {
    241 	case 3:
    242 		if (*p != '0') {
    243 			rval = 1;
    244 			(void)printf("%s hundred", name1[*p - '0']);
    245 		}
    246 		++p;
    247 		/* FALLTHROUGH */
    248 	case 2:
    249 		val = (p[1] - '0') + (p[0] - '0') * 10;
    250 		if (val) {
    251 			if (rval)
    252 				(void)printf(" ");
    253 			if (val < 20)
    254 				(void)printf("%s", name1[val]);
    255 			else {
    256 				(void)printf("%s", name2[val / 10]);
    257 				if (val % 10)
    258 					(void)printf("-%s", name1[val % 10]);
    259 			}
    260 			rval = 1;
    261 		}
    262 		break;
    263 	case 1:
    264 		if (*p != '0') {
    265 			rval = 1;
    266 			(void)printf("%s", name1[*p - '0']);
    267 		}
    268 	}
    269 	return (rval);
    270 }
    271 
    272 void
    273 pfract(len)
    274 	int len;
    275 {
    276 	static const char *const pref[] = { "", "ten-", "hundred-" };
    277 
    278 	switch(len) {
    279 	case 1:
    280 		(void)printf("tenths.\n");
    281 		break;
    282 	case 2:
    283 		(void)printf("hundredths.\n");
    284 		break;
    285 	default:
    286 		(void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
    287 		break;
    288 	}
    289 }
    290 
    291 void
    292 usage()
    293 {
    294 	(void)fprintf(stderr, "usage: number [# ...]\n");
    295 	exit(1);
    296 }
    297