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      1 /*	$NetBSD: number.c,v 1.17 2021/05/02 12:50:45 rillig 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\
     35  The Regents of the University of California.  All rights reserved.");
     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 1.17 2021/05/02 12:50:45 rillig 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 int	main(int, char *[]);
     80 static void convert(char *);
     81 static int number(const char *, size_t);
     82 static void pfract(size_t);
     83 static int unit(size_t, const char *);
     84 static void usage(void) __dead;
     85 
     86 static int lflag;
     87 
     88 int
     89 main(int argc, char *argv[])
     90 {
     91 	int ch, first;
     92 	char line[256];
     93 
     94 	lflag = 0;
     95 	while ((ch = getopt(argc, argv, "l")) != -1)
     96 		switch (ch) {
     97 		case 'l':
     98 			lflag = 1;
     99 			break;
    100 		case '?':
    101 		default:
    102 			usage();
    103 		}
    104 	argc -= optind;
    105 	argv += optind;
    106 
    107 	if (*argv == NULL)
    108 		for (first = 1;
    109 		    fgets(line, sizeof(line), stdin) != NULL; first = 0) {
    110 			if (strchr(line, '\n') == NULL)
    111 				errx(1, "line too long.");
    112 			if (!first)
    113 				(void)printf("...\n");
    114 			convert(line);
    115 		}
    116 	else
    117 		for (first = 1; *argv != NULL; first = 0, ++argv) {
    118 			if (!first)
    119 				(void)printf("...\n");
    120 			convert(*argv);
    121 		}
    122 	exit(0);
    123 }
    124 
    125 void
    126 convert(char *line)
    127 {
    128 	size_t flen, len;
    129 	int rval;
    130 	char *p, *fraction;
    131 
    132 	flen = 0;
    133 	fraction = NULL;
    134 	for (p = line; *p != '\0' && *p != '\n'; ++p) {
    135 		if (isblank((unsigned char)*p)) {
    136 			if (p == line) {
    137 				++line;
    138 				continue;
    139 			}
    140 			goto badnum;
    141 		}
    142 		if (isdigit((unsigned char)*p))
    143 			continue;
    144 		switch (*p) {
    145 		case '.':
    146 			if (fraction != NULL)
    147 				goto badnum;
    148 			fraction = p + 1;
    149 			*p = '\0';
    150 			break;
    151 		case '-':
    152 			if (p == line)
    153 				break;
    154 			/* FALLTHROUGH */
    155 		default:
    156 badnum:			errx(1, "illegal number: %s", line);
    157 			break;
    158 		}
    159 	}
    160 	*p = '\0';
    161 
    162 	if ((len = strlen(line)) > MAXNUM ||
    163 	    (fraction != NULL && (flen = strlen(fraction)) > MAXNUM))
    164 		errx(1, "number too large, max %d digits.", MAXNUM);
    165 
    166 	if (*line == '-') {
    167 		(void)printf("minus%s", lflag ? " " : "\n");
    168 		++line;
    169 		--len;
    170 	}
    171 
    172 	rval = len > 0 ? unit(len, line) : 0;
    173 	if (fraction != NULL && flen != 0)
    174 		for (p = fraction; *p != '\0'; ++p)
    175 			if (*p != '0') {
    176 				if (rval)
    177 					(void)printf("%sand%s",
    178 					    lflag ? " " : "",
    179 					    lflag ? " " : "\n");
    180 				if (unit(flen, fraction)) {
    181 					if (lflag)
    182 						(void)printf(" ");
    183 					pfract(flen);
    184 					rval = 1;
    185 				}
    186 				break;
    187 			}
    188 	if (!rval)
    189 		(void)printf("zero%s", lflag ? "" : ".\n");
    190 	if (lflag)
    191 		(void)printf("\n");
    192 }
    193 
    194 int
    195 unit(size_t len, const char *p)
    196 {
    197 	size_t off;
    198 	int rval;
    199 
    200 	rval = 0;
    201 	if (len > 3) {
    202 		if (len % 3) {
    203 			off = len % 3;
    204 			len -= off;
    205 			if (number(p, off)) {
    206 				rval = 1;
    207 				(void)printf(" %s%s",
    208 				    name3[len / 3], lflag ? " " : ".\n");
    209 			}
    210 			p += off;
    211 		}
    212 		for (; len > 3; p += 3) {
    213 			len -= 3;
    214 			if (number(p, 3)) {
    215 				rval = 1;
    216 				(void)printf(" %s%s",
    217 				    name3[len / 3], lflag ? " " : ".\n");
    218 			}
    219 		}
    220 	}
    221 	if (number(p, len)) {
    222 		if (!lflag)
    223 			(void)printf(".\n");
    224 		rval = 1;
    225 	}
    226 	return (rval);
    227 }
    228 
    229 int
    230 number(const char *p, size_t len)
    231 {
    232 	int val, rval;
    233 
    234 	rval = 0;
    235 	switch (len) {
    236 	case 3:
    237 		if (*p != '0') {
    238 			rval = 1;
    239 			(void)printf("%s hundred", name1[*p - '0']);
    240 		}
    241 		++p;
    242 		/* FALLTHROUGH */
    243 	case 2:
    244 		val = (p[1] - '0') + (p[0] - '0') * 10;
    245 		if (val) {
    246 			if (rval)
    247 				(void)printf(" ");
    248 			if (val < 20)
    249 				(void)printf("%s", name1[val]);
    250 			else {
    251 				(void)printf("%s", name2[val / 10]);
    252 				if (val % 10)
    253 					(void)printf("-%s", name1[val % 10]);
    254 			}
    255 			rval = 1;
    256 		}
    257 		break;
    258 	case 1:
    259 		if (*p != '0') {
    260 			rval = 1;
    261 			(void)printf("%s", name1[*p - '0']);
    262 		}
    263 	}
    264 	return (rval);
    265 }
    266 
    267 void
    268 pfract(size_t len)
    269 {
    270 	static const char *const pref[] = { "", "ten-", "hundred-" };
    271 
    272 	switch(len) {
    273 	case 1:
    274 		(void)printf("tenths.\n");
    275 		break;
    276 	case 2:
    277 		(void)printf("hundredths.\n");
    278 		break;
    279 	default:
    280 		(void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
    281 		break;
    282 	}
    283 }
    284 
    285 void
    286 usage(void)
    287 {
    288 	(void)fprintf(stderr, "usage: number [# ...]\n");
    289 	exit(1);
    290 }
    291