OpenBSD-4.6/games/number/number.c
/* $OpenBSD: number.c,v 1.13 2005/11/05 22:55:37 jmc Exp $ */
/*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1988, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)number.c 8.3 (Berkeley) 5/4/95";
#else
static char rcsid[] = "$OpenBSD: number.c,v 1.13 2005/11/05 22:55:37 jmc Exp $";
#endif
#endif /* not lint */
#include <sys/types.h>
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define MAXNUM 65 /* Biggest number we handle. */
#define LINELEN 256
static const char *const name1[] = {
"", "one", "two", "three",
"four", "five", "six", "seven",
"eight", "nine", "ten", "eleven",
"twelve", "thirteen", "fourteen", "fifteen",
"sixteen", "seventeen", "eighteen", "nineteen",
},
*const name2[] = {
"", "ten", "twenty", "thirty",
"forty", "fifty", "sixty", "seventy",
"eighty", "ninety",
},
*const name3[] = {
"hundred", "thousand", "million", "billion",
"trillion", "quadrillion", "quintillion", "sextillion",
"septillion", "octillion", "nonillion", "decillion",
"undecillion", "duodecillion", "tredecillion", "quattuordecillion",
"quindecillion", "sexdecillion",
"septendecillion", "octodecillion",
"novemdecillion", "vigintillion",
};
void convert(char *);
void convertexp(char *);
int number(const char *, int);
void pfract(int);
void toobig(void);
int unit(int, const char *);
void usage(void);
int lflag;
int
main(int argc, char *argv[])
{
int ch, first;
char line[LINELEN];
lflag = 0;
while ((ch = getopt(argc, argv, "hl")) != -1)
switch (ch) {
case 'l':
lflag = 1;
break;
case '?':
case 'h':
default:
usage();
}
argc -= optind;
argv += optind;
if (*argv == NULL)
for (first = 1;
fgets(line, sizeof(line), stdin) != NULL; first = 0) {
if (strchr(line, '\n') == NULL)
errx(1, "line too long.");
if (!first)
(void)printf("...\n");
convert(line);
if (lflag)
(void)printf("\n");
}
else
for (first = 1; *argv != NULL; first = 0, ++argv) {
if (!first)
(void)printf("...\n");
convert(*argv);
if (lflag)
(void)printf("\n");
}
exit(0);
}
void
convert(char *line)
{
int flen, len, rval;
char *p, *fraction;
/* strip trailing and leading whitespace */
len = strlen(line) - 1;
while ((isblank(line[len])) || (line[len] == '\n'))
line[len--] = '\0';
while ((isblank(line[0])) || (line[0] == '\n'))
line++;
if (strchr(line, 'e') || strchr(line, 'E'))
convertexp(line);
else {
fraction = NULL;
for (p = line; *p != '\0' && *p != '\n'; ++p) {
if (isblank(*p))
goto badnum;
if (isdigit(*p))
continue;
switch (*p) {
case '.':
if (fraction != NULL)
goto badnum;
fraction = p + 1;
*p = '\0';
break;
case '-':
case '+':
if (p == line)
break;
/* FALLTHROUGH */
default:
badnum: errx(1, "illegal number: %s", line);
break;
}
}
*p = '\0';
if ((len = strlen(line)) > MAXNUM ||
((fraction != NULL) && (flen = strlen(fraction)) > MAXNUM))
errx(1, "number too long (max %d digits).", MAXNUM);
if (*line == '-') {
(void)printf("minus%s", lflag ? " " : "\n");
++line;
--len;
}
if (*line == '+') {
(void)printf("plus%s", lflag ? " " : "\n");
++line;
--len;
}
rval = len > 0 ? unit(len, line) : 0;
if (fraction != NULL && flen != 0)
for (p = fraction; *p != '\0'; ++p)
if (*p != '0') {
if (rval)
(void)printf("%sand%s",
lflag ? " " : "",
lflag ? " " : "\n");
if (unit(flen, fraction)) {
if (lflag)
(void)printf(" ");
pfract(flen);
rval = 1;
}
break;
}
if (!rval)
(void)printf("zero%s", lflag ? "" : ".\n");
}
}
void
convertexp(char *line)
{
char locline[LINELEN];
char *part1, *part2, *part3, *part4;
char tmp[2];
int i, j;
(void)strlcpy(locline,line,LINELEN);
part3 = locline;
part2 = strsep(&part3, "eE"); /* part3 is the exponent */
part4 = part3;
(void)strsep(&part4, "."); /* no decimal allowed in the exponent */
if (part4)
errx(1, "illegal number: %s", line);
part1 = strsep(&part2, "."); /* we can have one in the mantissa */
/* At this point everything should be null or a digit. Check for
* that before starting to convert. Two characters may be + or -.
*/
j = strlen(line);
for (i = 0; i < j; i++)
if ((!isdigit(locline[i])) && (locline[i]))
if (((locline[i] != '+') && (locline[i] != '-')) ||
((i != 0) && (i != part3 - locline)))
errx(1, "illegal number: %s", line);
convert(part1);
printf("%s", lflag ? " " : "");
if (part2 && part2[0]) { /* do individual digits separately */
(void)printf("point%s", lflag ? " " : "\n");
j = strlen(part2); tmp[1] = '\0';
for (i = 0 ; i < j; i++ ) {
tmp[0] = part2[i];
convert(tmp);
(void)printf("%s", lflag ? " " : "");
}
}
(void)printf("times ten to the%s", lflag ? " " : "\n");
if (part3 && part3[0])
convert(part3);
else
(void)printf("zero%s", lflag ? " " : ".\n");
}
int
unit(int len, const char *p)
{
int off, rval;
rval = 0;
if (len > 3) {
if (len % 3) {
off = len % 3;
len -= off;
if (number(p, off)) {
rval = 1;
(void)printf(" %s%s",
name3[len / 3], lflag ? " " : ".\n");
}
p += off;
}
for (; len > 3; p += 3) {
len -= 3;
if (number(p, 3)) {
rval = 1;
(void)printf(" %s%s",
name3[len / 3], lflag ? " " : ".\n");
}
}
}
if (number(p, len)) {
if (!lflag)
(void)printf(".\n");
rval = 1;
}
return (rval);
}
int
number(const char *p, int len)
{
int val, rval;
rval = 0;
switch (len) {
case 3:
if (*p != '0') {
rval = 1;
(void)printf("%s hundred", name1[*p - '0']);
}
++p;
/* FALLTHROUGH */
case 2:
val = (p[1] - '0') + (p[0] - '0') * 10;
if (val) {
if (rval)
(void)printf(" ");
if (val < 20)
(void)printf("%s", name1[val]);
else {
(void)printf("%s", name2[val / 10]);
if (val % 10)
(void)printf("-%s", name1[val % 10]);
}
rval = 1;
}
break;
case 1:
if (*p != '0') {
rval = 1;
(void)printf("%s", name1[*p - '0']);
}
}
return (rval);
}
void
pfract(int len)
{
static const char *const pref[] = { "", "ten-", "hundred-" };
switch(len) {
case 1:
(void)printf("tenths%s", lflag ? "" : ".\n");
break;
case 2:
(void)printf("hundredths%s", lflag ? "" : ".\n");
break;
default:
(void)printf("%s%sths%s", pref[len % 3], name3[len / 3],
lflag ? "" : ".\n");
break;
}
}
void
usage(void)
{
(void)fprintf(stderr, "usage: number [-l] [--] [# ...]\n");
exit(1);
}