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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/types.h> 31 32 #include <ctype.h> 33 #include <err.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 39 #define MAXNUM 65 /* Biggest number we handle. */ 40 41 static const char *name1[] = { 42 "", "one", "two", "three", 43 "four", "five", "six", "seven", 44 "eight", "nine", "ten", "eleven", 45 "twelve", "thirteen", "fourteen", "fifteen", 46 "sixteen", "seventeen", "eighteen", "nineteen", 47 }, 48 *name2[] = { 49 "", "ten", "twenty", "thirty", 50 "forty", "fifty", "sixty", "seventy", 51 "eighty", "ninety", 52 }, 53 *name3[] = { 54 "hundred", "thousand", "million", "billion", 55 "trillion", "quadrillion", "quintillion", "sextillion", 56 "septillion", "octillion", "nonillion", "decillion", 57 "undecillion", "duodecillion", "tredecillion", "quattuordecillion", 58 "quindecillion", "sexdecillion", 59 "septendecillion", "octodecillion", 60 "novemdecillion", "vigintillion", 61 }; 62 63 static void convert(char *); 64 static int number(char *, int); 65 static void pfract(int); 66 static int unit(int, char *); 67 static void usage(void); 68 69 static int lflag; 70 71 int 72 main(int argc, char *argv[]) 73 { 74 int ch, first; 75 char line[256]; 76 77 lflag = 0; 78 while ((ch = getopt(argc, argv, "l")) != -1) 79 switch (ch) { 80 case 'l': 81 lflag = 1; 82 break; 83 case '?': 84 default: 85 usage(); 86 } 87 argc -= optind; 88 argv += optind; 89 90 if (*argv == NULL) 91 for (first = 1; 92 fgets(line, sizeof(line), stdin) != NULL; first = 0) { 93 if (strchr(line, '\n') == NULL) 94 errx(1, "line too long."); 95 if (!first) 96 (void)printf("...\n"); 97 convert(line); 98 } 99 else 100 for (first = 1; *argv != NULL; first = 0, ++argv) { 101 if (!first) 102 (void)printf("...\n"); 103 convert(*argv); 104 } 105 exit(0); 106 } 107 108 static void 109 convert(char *line) 110 { 111 int flen, len, rval; 112 char *p, *fraction; 113 114 flen = 0; 115 fraction = NULL; 116 for (p = line; *p != '\0' && *p != '\n'; ++p) { 117 if (isblank(*p)) { 118 if (p == line) { 119 ++line; 120 continue; 121 } 122 goto badnum; 123 } 124 if (isdigit(*p)) 125 continue; 126 switch (*p) { 127 case '.': 128 if (fraction != NULL) 129 goto badnum; 130 fraction = p + 1; 131 *p = '\0'; 132 break; 133 case '-': 134 if (p == line) 135 break; 136 /* FALLTHROUGH */ 137 default: 138 badnum: errx(1, "illegal number: %s", line); 139 break; 140 } 141 } 142 *p = '\0'; 143 144 if ((len = strlen(line)) > MAXNUM || 145 (fraction != NULL && ((flen = strlen(fraction)) > MAXNUM))) 146 errx(1, "number too large, max %d digits.", MAXNUM); 147 148 if (*line == '-') { 149 (void)printf("minus%s", lflag ? " " : "\n"); 150 ++line; 151 --len; 152 } 153 154 rval = len > 0 ? unit(len, line) : 0; 155 if (fraction != NULL && flen != 0) 156 for (p = fraction; *p != '\0'; ++p) 157 if (*p != '0') { 158 if (rval) 159 (void)printf("%sand%s", 160 lflag ? " " : "", 161 lflag ? " " : "\n"); 162 if (unit(flen, fraction)) { 163 if (lflag) 164 (void)printf(" "); 165 pfract(flen); 166 rval = 1; 167 } 168 break; 169 } 170 if (!rval) 171 (void)printf("zero%s", lflag ? "" : ".\n"); 172 if (lflag) 173 (void)printf("\n"); 174 } 175 176 static int 177 unit(int len, char *p) 178 { 179 int off, rval; 180 181 rval = 0; 182 if (len > 3) { 183 if (len % 3) { 184 off = len % 3; 185 len -= off; 186 if (number(p, off)) { 187 rval = 1; 188 (void)printf(" %s%s", 189 name3[len / 3], lflag ? " " : ".\n"); 190 } 191 p += off; 192 } 193 for (; len > 3; p += 3) { 194 len -= 3; 195 if (number(p, 3)) { 196 rval = 1; 197 (void)printf(" %s%s", 198 name3[len / 3], lflag ? " " : ".\n"); 199 } 200 } 201 } 202 if (number(p, len)) { 203 if (!lflag) 204 (void)printf(".\n"); 205 rval = 1; 206 } 207 return (rval); 208 } 209 210 static int 211 number(char *p, int len) 212 { 213 int val, rval; 214 215 rval = 0; 216 switch (len) { 217 case 3: 218 if (*p != '0') { 219 rval = 1; 220 (void)printf("%s hundred", name1[*p - '0']); 221 } 222 ++p; 223 /* FALLTHROUGH */ 224 case 2: 225 val = (p[1] - '0') + (p[0] - '0') * 10; 226 if (val) { 227 if (rval) 228 (void)printf(" "); 229 if (val < 20) 230 (void)printf("%s", name1[val]); 231 else { 232 (void)printf("%s", name2[val / 10]); 233 if (val % 10) 234 (void)printf("-%s", name1[val % 10]); 235 } 236 rval = 1; 237 } 238 break; 239 case 1: 240 if (*p != '0') { 241 rval = 1; 242 (void)printf("%s", name1[*p - '0']); 243 } 244 } 245 return (rval); 246 } 247 248 static void 249 pfract(int len) 250 { 251 static char const * const pref[] = { "", "ten-", "hundred-" }; 252 253 switch(len) { 254 case 1: 255 (void)printf("tenths.\n"); 256 break; 257 case 2: 258 (void)printf("hundredths.\n"); 259 break; 260 default: 261 (void)printf("%s%sths.\n", pref[len % 3], name3[len / 3]); 262 break; 263 } 264 } 265 266 static void 267 usage(void) 268 { 269 (void)fprintf(stderr, "usage: number [-l] [# ...]\n"); 270 exit(1); 271 } 272