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number.c revision 1.3 
      1 /*	$NetBSD: number.c,v 1.3 1995/03/23 08:35:30 cgd 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 #ifndef lint
     37 static char copyright[] =
     38 "@(#) 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	8.2 (Berkeley) 3/31/94";
     45 #else
     46 static char rcsid[] = "$NetBSD: number.c,v 1.3 1995/03/23 08:35:30 cgd Exp $";
     47 #endif
     48 #endif /* not lint */
     49 
     50 #include <sys/types.h>
     51 
     52 #include <ctype.h>
     53 #include <stdio.h>
     54 #include <stdlib.h>
     55 #include <string.h>
     56 #include <err.h>
     57 
     58 #define	MAXNUM		65		/* Biggest number we handle. */
     59 
     60 static char	*name1[] = {
     61 	"",		"one",		"two",		"three",
     62 	"four",		"five",		"six",		"seven",
     63 	"eight",	"nine",		"ten",		"eleven",
     64 	"twelve",	"thirteen",	"fourteen",	"fifteen",
     65 	"sixteen",	"seventeen",	"eighteen",	"nineteen",
     66 },
     67 		*name2[] = {
     68 	"",		"ten",		"twenty",	"thirty",
     69 	"forty",	"fifty",	"sixty",	"seventy",
     70 	"eighty",	"ninety",
     71 },
     72 		*name3[] = {
     73 	"hundred",	"thousand",	"million",	"billion",
     74 	"trillion",	"quadrillion",	"quintillion",	"sextillion",
     75 	"septillion",	"octillion",	"nonillion",	"decillion",
     76 	"undecillion",	"duodecillion",	"tredecillion",	"quattuordecillion",
     77 	"quindecillion",		"sexdecillion",
     78 	"septendecillion",		"octodecillion",
     79 	"novemdecillion",		"vigintillion",
     80 };
     81 
     82 void	convert __P((char *));
     83 int	number __P((char *, int));
     84 void	pfract __P((int));
     85 void	toobig __P((void));
     86 int	unit __P((int, char *));
     87 void	usage __P((void));
     88 
     89 int lflag;
     90 
     91 int
     92 main(argc, argv)
     93 	int argc;
     94 	char *argv[];
     95 {
     96 	int ch, first;
     97 	char line[256];
     98 
     99 	lflag = 0;
    100 	while ((ch = getopt(argc, argv, "l")) != EOF)
    101 		switch (ch) {
    102 		case 'l':
    103 			lflag = 1;
    104 			break;
    105 		case '?':
    106 		default:
    107 			usage();
    108 		}
    109 	argc -= optind;
    110 	argv += optind;
    111 
    112 	if (*argv == NULL)
    113 		for (first = 1;
    114 		    fgets(line, sizeof(line), stdin) != NULL; first = 0) {
    115 			if (strchr(line, '\n') == NULL)
    116 				errx(1, "line too long.");
    117 			if (!first)
    118 				(void)printf("...\n");
    119 			convert(line);
    120 		}
    121 	else
    122 		for (first = 1; *argv != NULL; first = 0, ++argv) {
    123 			if (!first)
    124 				(void)printf("...\n");
    125 			convert(*argv);
    126 		}
    127 	exit(0);
    128 }
    129 
    130 void
    131 convert(line)
    132 	char *line;
    133 {
    134 	register flen, len, rval;
    135 	register char *p, *fraction;
    136 
    137 	fraction = NULL;
    138 	for (p = line; *p != '\0' && *p != '\n'; ++p) {
    139 		if (isblank(*p)) {
    140 			if (p == line) {
    141 				++line;
    142 				continue;
    143 			}
    144 			goto badnum;
    145 		}
    146 		if (isdigit(*p))
    147 			continue;
    148 		switch (*p) {
    149 		case '.':
    150 			if (fraction != NULL)
    151 				goto badnum;
    152 			fraction = p + 1;
    153 			*p = '\0';
    154 			break;
    155 		case '-':
    156 			if (p == line)
    157 				break;
    158 			/* FALLTHROUGH */
    159 		default:
    160 badnum:			errx(1, "illegal number: %s", line);
    161 			break;
    162 		}
    163 	}
    164 	*p = '\0';
    165 
    166 	if ((len = strlen(line)) > MAXNUM ||
    167 	    fraction != NULL && (flen = strlen(fraction)) > MAXNUM)
    168 		errx(1, "number too large, max %d digits.", MAXNUM);
    169 
    170 	if (*line == '-') {
    171 		(void)printf("minus%s", lflag ? " " : "\n");
    172 		++line;
    173 	}
    174 
    175 	rval = len > 0 ? unit(len, line) : 0;
    176 	if (fraction != NULL && flen != 0)
    177 		for (p = fraction; *p != '\0'; ++p)
    178 			if (*p != '0') {
    179 				if (rval)
    180 					(void)printf("%sand%s",
    181 					    lflag ? " " : "",
    182 					    lflag ? " " : "\n");
    183 				if (unit(flen, fraction)) {
    184 					if (lflag)
    185 						(void)printf(" ");
    186 					pfract(flen);
    187 					rval = 1;
    188 				}
    189 				break;
    190 			}
    191 	if (!rval)
    192 		(void)printf("zero%s", lflag ? "" : ".\n");
    193 	if (lflag)
    194 		(void)printf("\n");
    195 }
    196 
    197 int
    198 unit(len, p)
    199 	register int len;
    200 	register char *p;
    201 {
    202 	register int off, rval;
    203 
    204 	rval = 0;
    205 	if (len > 3) {
    206 		if (len % 3) {
    207 			off = len % 3;
    208 			len -= off;
    209 			if (number(p, off)) {
    210 				rval = 1;
    211 				(void)printf(" %s%s",
    212 				    name3[len / 3], lflag ? " " : ".\n");
    213 			}
    214 			p += off;
    215 		}
    216 		for (; len > 3; p += 3) {
    217 			len -= 3;
    218 			if (number(p, 3)) {
    219 				rval = 1;
    220 				(void)printf(" %s%s",
    221 				    name3[len / 3], lflag ? " " : ".\n");
    222 			}
    223 		}
    224 	}
    225 	if (number(p, len)) {
    226 		if (!lflag)
    227 			(void)printf(".\n");
    228 		rval = 1;
    229 	}
    230 	return (rval);
    231 }
    232 
    233 int
    234 number(p, len)
    235 	register char *p;
    236 	int len;
    237 {
    238 	register int val, rval;
    239 
    240 	rval = 0;
    241 	switch (len) {
    242 	case 3:
    243 		if (*p != '0') {
    244 			rval = 1;
    245 			(void)printf("%s hundred", name1[*p - '0']);
    246 		}
    247 		++p;
    248 		/* FALLTHROUGH */
    249 	case 2:
    250 		val = (p[1] - '0') + (p[0] - '0') * 10;
    251 		if (val) {
    252 			if (rval)
    253 				(void)printf(" ");
    254 			if (val < 20)
    255 				(void)printf("%s", name1[val]);
    256 			else {
    257 				(void)printf("%s", name2[val / 10]);
    258 				if (val % 10)
    259 					(void)printf("-%s", name1[val % 10]);
    260 			}
    261 			rval = 1;
    262 		}
    263 		break;
    264 	case 1:
    265 		if (*p != '0') {
    266 			rval = 1;
    267 			(void)printf("%s", name1[*p - '0']);
    268 		}
    269 	}
    270 	return (rval);
    271 }
    272 
    273 void
    274 pfract(len)
    275 	int len;
    276 {
    277 	static char *pref[] = { "", "ten-", "hundred-" };
    278 
    279 	switch(len) {
    280 	case 1:
    281 		(void)printf("tenths.\n");
    282 		break;
    283 	case 2:
    284 		(void)printf("hundredths.\n");
    285 		break;
    286 	default:
    287 		(void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
    288 		break;
    289 	}
    290 }
    291 
    292 void
    293 usage()
    294 {
    295 	(void)fprintf(stderr, "usage: number [# ...]\n");
    296 	exit(1);
    297 }
    298