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number.c revision 1.1.1.3 
      1 /*
      2  * Copyright (c) 1988, 1993, 1994
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char copyright[] =
     36 "@(#) Copyright (c) 1988, 1993, 1994\n\
     37 	The Regents of the University of California.  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 static char sccsid[] = "@(#)number.c	8.3 (Berkeley) 5/4/95";
     42 #endif /* not lint */
     43 
     44 #include <sys/types.h>
     45 
     46 #include <ctype.h>
     47 #include <err.h>
     48 #include <stdio.h>
     49 #include <stdlib.h>
     50 #include <string.h>
     51 #include <unistd.h>
     52 
     53 #define	MAXNUM		65		/* Biggest number we handle. */
     54 
     55 static char	*name1[] = {
     56 	"",		"one",		"two",		"three",
     57 	"four",		"five",		"six",		"seven",
     58 	"eight",	"nine",		"ten",		"eleven",
     59 	"twelve",	"thirteen",	"fourteen",	"fifteen",
     60 	"sixteen",	"seventeen",	"eighteen",	"nineteen",
     61 },
     62 		*name2[] = {
     63 	"",		"ten",		"twenty",	"thirty",
     64 	"forty",	"fifty",	"sixty",	"seventy",
     65 	"eighty",	"ninety",
     66 },
     67 		*name3[] = {
     68 	"hundred",	"thousand",	"million",	"billion",
     69 	"trillion",	"quadrillion",	"quintillion",	"sextillion",
     70 	"septillion",	"octillion",	"nonillion",	"decillion",
     71 	"undecillion",	"duodecillion",	"tredecillion",	"quattuordecillion",
     72 	"quindecillion",		"sexdecillion",
     73 	"septendecillion",		"octodecillion",
     74 	"novemdecillion",		"vigintillion",
     75 };
     76 
     77 void	convert __P((char *));
     78 int	number __P((char *, int));
     79 void	pfract __P((int));
     80 void	toobig __P((void));
     81 int	unit __P((int, char *));
     82 void	usage __P((void));
     83 
     84 int lflag;
     85 
     86 int
     87 main(argc, argv)
     88 	int argc;
     89 	char *argv[];
     90 {
     91 	int ch, first;
     92 	char line[256];
     93 
     94 	lflag = 0;
     95 	while ((ch = getopt(argc, argv, "l")) != EOF)
     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(line)
    127 	char *line;
    128 {
    129 	register flen, len, rval;
    130 	register char *p, *fraction;
    131 
    132 	fraction = NULL;
    133 	for (p = line; *p != '\0' && *p != '\n'; ++p) {
    134 		if (isblank(*p)) {
    135 			if (p == line) {
    136 				++line;
    137 				continue;
    138 			}
    139 			goto badnum;
    140 		}
    141 		if (isdigit(*p))
    142 			continue;
    143 		switch (*p) {
    144 		case '.':
    145 			if (fraction != NULL)
    146 				goto badnum;
    147 			fraction = p + 1;
    148 			*p = '\0';
    149 			break;
    150 		case '-':
    151 			if (p == line)
    152 				break;
    153 			/* FALLTHROUGH */
    154 		default:
    155 badnum:			errx(1, "illegal number: %s", line);
    156 			break;
    157 		}
    158 	}
    159 	*p = '\0';
    160 
    161 	if ((len = strlen(line)) > MAXNUM ||
    162 	    fraction != NULL && (flen = strlen(fraction)) > MAXNUM)
    163 		errx(1, "number too large, max %d digits.", MAXNUM);
    164 
    165 	if (*line == '-') {
    166 		(void)printf("minus%s", lflag ? " " : "\n");
    167 		++line;
    168 	}
    169 
    170 	rval = len > 0 ? unit(len, line) : 0;
    171 	if (fraction != NULL && flen != 0)
    172 		for (p = fraction; *p != '\0'; ++p)
    173 			if (*p != '0') {
    174 				if (rval)
    175 					(void)printf("%sand%s",
    176 					    lflag ? " " : "",
    177 					    lflag ? " " : "\n");
    178 				if (unit(flen, fraction)) {
    179 					if (lflag)
    180 						(void)printf(" ");
    181 					pfract(flen);
    182 					rval = 1;
    183 				}
    184 				break;
    185 			}
    186 	if (!rval)
    187 		(void)printf("zero%s", lflag ? "" : ".\n");
    188 	if (lflag)
    189 		(void)printf("\n");
    190 }
    191 
    192 int
    193 unit(len, p)
    194 	register int len;
    195 	register char *p;
    196 {
    197 	register int off, rval;
    198 
    199 	rval = 0;
    200 	if (len > 3) {
    201 		if (len % 3) {
    202 			off = len % 3;
    203 			len -= off;
    204 			if (number(p, off)) {
    205 				rval = 1;
    206 				(void)printf(" %s%s",
    207 				    name3[len / 3], lflag ? " " : ".\n");
    208 			}
    209 			p += off;
    210 		}
    211 		for (; len > 3; p += 3) {
    212 			len -= 3;
    213 			if (number(p, 3)) {
    214 				rval = 1;
    215 				(void)printf(" %s%s",
    216 				    name3[len / 3], lflag ? " " : ".\n");
    217 			}
    218 		}
    219 	}
    220 	if (number(p, len)) {
    221 		if (!lflag)
    222 			(void)printf(".\n");
    223 		rval = 1;
    224 	}
    225 	return (rval);
    226 }
    227 
    228 int
    229 number(p, len)
    230 	register char *p;
    231 	int len;
    232 {
    233 	register int val, rval;
    234 
    235 	rval = 0;
    236 	switch (len) {
    237 	case 3:
    238 		if (*p != '0') {
    239 			rval = 1;
    240 			(void)printf("%s hundred", name1[*p - '0']);
    241 		}
    242 		++p;
    243 		/* FALLTHROUGH */
    244 	case 2:
    245 		val = (p[1] - '0') + (p[0] - '0') * 10;
    246 		if (val) {
    247 			if (rval)
    248 				(void)printf(" ");
    249 			if (val < 20)
    250 				(void)printf("%s", name1[val]);
    251 			else {
    252 				(void)printf("%s", name2[val / 10]);
    253 				if (val % 10)
    254 					(void)printf("-%s", name1[val % 10]);
    255 			}
    256 			rval = 1;
    257 		}
    258 		break;
    259 	case 1:
    260 		if (*p != '0') {
    261 			rval = 1;
    262 			(void)printf("%s", name1[*p - '0']);
    263 		}
    264 	}
    265 	return (rval);
    266 }
    267 
    268 void
    269 pfract(len)
    270 	int len;
    271 {
    272 	static char *pref[] = { "", "ten-", "hundred-" };
    273 
    274 	switch(len) {
    275 	case 1:
    276 		(void)printf("tenths.\n");
    277 		break;
    278 	case 2:
    279 		(void)printf("hundredths.\n");
    280 		break;
    281 	default:
    282 		(void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
    283 		break;
    284 	}
    285 }
    286 
    287 void
    288 usage()
    289 {
    290 	(void)fprintf(stderr, "usage: number [# ...]\n");
    291 	exit(1);
    292 }
    293