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number.c revision 1.1.1.2 
      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	8.2 (Berkeley) 3/31/94";
     42 #endif /* not lint */
     43 
     44 #include <sys/types.h>
     45 
     46 #include <ctype.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <string.h>
     50 #include <err.h>
     51 
     52 #define	MAXNUM		65		/* Biggest number we handle. */
     53 
     54 static char	*name1[] = {
     55 	"",		"one",		"two",		"three",
     56 	"four",		"five",		"six",		"seven",
     57 	"eight",	"nine",		"ten",		"eleven",
     58 	"twelve",	"thirteen",	"fourteen",	"fifteen",
     59 	"sixteen",	"seventeen",	"eighteen",	"nineteen",
     60 },
     61 		*name2[] = {
     62 	"",		"ten",		"twenty",	"thirty",
     63 	"forty",	"fifty",	"sixty",	"seventy",
     64 	"eighty",	"ninety",
     65 },
     66 		*name3[] = {
     67 	"hundred",	"thousand",	"million",	"billion",
     68 	"trillion",	"quadrillion",	"quintillion",	"sextillion",
     69 	"septillion",	"octillion",	"nonillion",	"decillion",
     70 	"undecillion",	"duodecillion",	"tredecillion",	"quattuordecillion",
     71 	"quindecillion",		"sexdecillion",
     72 	"septendecillion",		"octodecillion",
     73 	"novemdecillion",		"vigintillion",
     74 };
     75 
     76 void	convert __P((char *));
     77 int	number __P((char *, int));
     78 void	pfract __P((int));
     79 void	toobig __P((void));
     80 int	unit __P((int, char *));
     81 void	usage __P((void));
     82 
     83 int lflag;
     84 
     85 int
     86 main(argc, argv)
     87 	int argc;
     88 	char *argv[];
     89 {
     90 	int ch, first;
     91 	char line[256];
     92 
     93 	lflag = 0;
     94 	while ((ch = getopt(argc, argv, "l")) != EOF)
     95 		switch (ch) {
     96 		case 'l':
     97 			lflag = 1;
     98 			break;
     99 		case '?':
    100 		default:
    101 			usage();
    102 		}
    103 	argc -= optind;
    104 	argv += optind;
    105 
    106 	if (*argv == NULL)
    107 		for (first = 1;
    108 		    fgets(line, sizeof(line), stdin) != NULL; first = 0) {
    109 			if (strchr(line, '\n') == NULL)
    110 				errx(1, "line too long.");
    111 			if (!first)
    112 				(void)printf("...\n");
    113 			convert(line);
    114 		}
    115 	else
    116 		for (first = 1; *argv != NULL; first = 0, ++argv) {
    117 			if (!first)
    118 				(void)printf("...\n");
    119 			convert(*argv);
    120 		}
    121 	exit(0);
    122 }
    123 
    124 void
    125 convert(line)
    126 	char *line;
    127 {
    128 	register flen, len, rval;
    129 	register char *p, *fraction;
    130 
    131 	fraction = NULL;
    132 	for (p = line; *p != '\0' && *p != '\n'; ++p) {
    133 		if (isblank(*p)) {
    134 			if (p == line) {
    135 				++line;
    136 				continue;
    137 			}
    138 			goto badnum;
    139 		}
    140 		if (isdigit(*p))
    141 			continue;
    142 		switch (*p) {
    143 		case '.':
    144 			if (fraction != NULL)
    145 				goto badnum;
    146 			fraction = p + 1;
    147 			*p = '\0';
    148 			break;
    149 		case '-':
    150 			if (p == line)
    151 				break;
    152 			/* FALLTHROUGH */
    153 		default:
    154 badnum:			errx(1, "illegal number: %s", line);
    155 			break;
    156 		}
    157 	}
    158 	*p = '\0';
    159 
    160 	if ((len = strlen(line)) > MAXNUM ||
    161 	    fraction != NULL && (flen = strlen(fraction)) > MAXNUM)
    162 		errx(1, "number too large, max %d digits.", MAXNUM);
    163 
    164 	if (*line == '-') {
    165 		(void)printf("minus%s", lflag ? " " : "\n");
    166 		++line;
    167 	}
    168 
    169 	rval = len > 0 ? unit(len, line) : 0;
    170 	if (fraction != NULL && flen != 0)
    171 		for (p = fraction; *p != '\0'; ++p)
    172 			if (*p != '0') {
    173 				if (rval)
    174 					(void)printf("%sand%s",
    175 					    lflag ? " " : "",
    176 					    lflag ? " " : "\n");
    177 				if (unit(flen, fraction)) {
    178 					if (lflag)
    179 						(void)printf(" ");
    180 					pfract(flen);
    181 					rval = 1;
    182 				}
    183 				break;
    184 			}
    185 	if (!rval)
    186 		(void)printf("zero%s", lflag ? "" : ".\n");
    187 	if (lflag)
    188 		(void)printf("\n");
    189 }
    190 
    191 int
    192 unit(len, p)
    193 	register int len;
    194 	register char *p;
    195 {
    196 	register int off, rval;
    197 
    198 	rval = 0;
    199 	if (len > 3) {
    200 		if (len % 3) {
    201 			off = len % 3;
    202 			len -= off;
    203 			if (number(p, off)) {
    204 				rval = 1;
    205 				(void)printf(" %s%s",
    206 				    name3[len / 3], lflag ? " " : ".\n");
    207 			}
    208 			p += off;
    209 		}
    210 		for (; len > 3; p += 3) {
    211 			len -= 3;
    212 			if (number(p, 3)) {
    213 				rval = 1;
    214 				(void)printf(" %s%s",
    215 				    name3[len / 3], lflag ? " " : ".\n");
    216 			}
    217 		}
    218 	}
    219 	if (number(p, len)) {
    220 		if (!lflag)
    221 			(void)printf(".\n");
    222 		rval = 1;
    223 	}
    224 	return (rval);
    225 }
    226 
    227 int
    228 number(p, len)
    229 	register char *p;
    230 	int len;
    231 {
    232 	register 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(len)
    269 	int len;
    270 {
    271 	static char *pref[] = { "", "ten-", "hundred-" };
    272 
    273 	switch(len) {
    274 	case 1:
    275 		(void)printf("tenths.\n");
    276 		break;
    277 	case 2:
    278 		(void)printf("hundredths.\n");
    279 		break;
    280 	default:
    281 		(void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]);
    282 		break;
    283 	}
    284 }
    285 
    286 void
    287 usage()
    288 {
    289 	(void)fprintf(stderr, "usage: number [# ...]\n");
    290 	exit(1);
    291 }
    292