1 /* $OpenBSD: number.c,v 1.20 2016/03/07 12:07:56 mestre 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 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 #define LINELEN 256 41 42 static const char *const name1[] = { 43 "", "one", "two", "three", 44 "four", "five", "six", "seven", 45 "eight", "nine", "ten", "eleven", 46 "twelve", "thirteen", "fourteen", "fifteen", 47 "sixteen", "seventeen", "eighteen", "nineteen", 48 }, 49 *const name2[] = { 50 "", "ten", "twenty", "thirty", 51 "forty", "fifty", "sixty", "seventy", 52 "eighty", "ninety", 53 }, 54 *const name3[] = { 55 "hundred", "thousand", "million", "billion", 56 "trillion", "quadrillion", "quintillion", "sextillion", 57 "septillion", "octillion", "nonillion", "decillion", 58 "undecillion", "duodecillion", "tredecillion", "quattuordecillion", 59 "quindecillion", "sexdecillion", 60 "septendecillion", "octodecillion", 61 "novemdecillion", "vigintillion", 62 }; 63 64 void convert(char *); 65 void convertexp(char *); 66 int number(const char *, int); 67 void pfract(int); 68 int unit(int, const char *); 69 __dead void usage(void); 70 71 int lflag; 72 73 int 74 main(int argc, char *argv[]) 75 { 76 int ch, first; 77 char line[LINELEN]; 78 79 if (pledge("stdio", NULL) == -1) 80 err(1, "pledge"); 81 82 lflag = 0; 83 while ((ch = getopt(argc, argv, "hl")) != -1) 84 switch (ch) { 85 case 'l': 86 lflag = 1; 87 break; 88 case 'h': 89 default: 90 usage(); 91 } 92 argc -= optind; 93 argv += optind; 94 95 if (*argv == NULL) 96 for (first = 1; 97 fgets(line, sizeof(line), stdin) != NULL; first = 0) { 98 if (strchr(line, '\n') == NULL) 99 errx(1, "line too long."); 100 if (!first) 101 (void)printf("...\n"); 102 convert(line); 103 if (lflag) 104 (void)printf("\n"); 105 } 106 else 107 for (first = 1; *argv != NULL; first = 0, ++argv) { 108 if (!first) 109 (void)printf("...\n"); 110 convert(*argv); 111 if (lflag) 112 (void)printf("\n"); 113 } 114 return 0; 115 } 116 117 void 118 convert(char *line) 119 { 120 int flen, len, rval; 121 char *p, *fraction; 122 123 /* strip trailing and leading whitespace */ 124 len = strlen(line) - 1; 125 while ((isblank((unsigned char)line[len])) || (line[len] == '\n')) 126 line[len--] = '\0'; 127 while ((isblank((unsigned char)line[0])) || (line[0] == '\n')) 128 line++; 129 if (strchr(line, 'e') || strchr(line, 'E')) 130 convertexp(line); 131 else { 132 fraction = NULL; 133 for (p = line; *p != '\0' && *p != '\n'; ++p) { 134 if (isblank((unsigned char)*p)) 135 goto badnum; 136 if (isdigit((unsigned char)*p)) 137 continue; 138 switch (*p) { 139 case '.': 140 if (fraction != NULL) 141 goto badnum; 142 fraction = p + 1; 143 *p = '\0'; 144 break; 145 case '-': 146 case '+': 147 if (p == line) 148 break; 149 /* FALLTHROUGH */ 150 default: 151 badnum: errx(1, "illegal number: %s", line); 152 break; 153 } 154 } 155 *p = '\0'; 156 157 if ((len = strlen(line)) > MAXNUM || 158 ((fraction != NULL) && (flen = strlen(fraction)) > MAXNUM)) 159 errx(1, "number too long (max %d digits).", MAXNUM); 160 161 if (*line == '-') { 162 (void)printf("minus%s", lflag ? " " : "\n"); 163 ++line; 164 --len; 165 } 166 if (*line == '+') { 167 (void)printf("plus%s", lflag ? " " : "\n"); 168 ++line; 169 --len; 170 } 171 172 rval = len > 0 ? unit(len, line) : 0; 173 if (fraction != NULL && flen != 0) 174 for (p = fraction; *p != '\0'; ++p) 175 if (*p != '0') { 176 if (rval) 177 (void)printf("%sand%s", 178 lflag ? " " : "", 179 lflag ? " " : "\n"); 180 if (unit(flen, fraction)) { 181 if (lflag) 182 (void)printf(" "); 183 pfract(flen); 184 rval = 1; 185 } 186 break; 187 } 188 if (!rval) 189 (void)printf("zero%s", lflag ? "" : ".\n"); 190 } 191 } 192 193 void 194 convertexp(char *line) 195 { 196 char locline[LINELEN]; 197 char *part1, *part2, *part3, *part4; 198 char tmp[2]; 199 int i, j; 200 201 (void)strlcpy(locline,line,LINELEN); 202 part3 = locline; 203 part2 = strsep(&part3, "eE"); /* part3 is the exponent */ 204 part4 = part3; 205 (void)strsep(&part4, "."); /* no decimal allowed in the exponent */ 206 if (part4) 207 errx(1, "illegal number: %s", line); 208 part1 = strsep(&part2, "."); /* we can have one in the mantissa */ 209 /* At this point everything should be null or a digit. Check for 210 * that before starting to convert. Two characters may be + or -. 211 */ 212 j = strlen(line); 213 for (i = 0; i < j; i++) 214 if ((!isdigit((unsigned char)locline[i])) && (locline[i])) 215 if (((locline[i] != '+') && (locline[i] != '-')) || 216 ((i != 0) && (i != part3 - locline))) 217 errx(1, "illegal number: %s", line); 218 convert(part1); 219 printf("%s", lflag ? " " : ""); 220 if (part2 && part2[0]) { /* do individual digits separately */ 221 (void)printf("point%s", lflag ? " " : "\n"); 222 j = strlen(part2); tmp[1] = '\0'; 223 for (i = 0 ; i < j; i++ ) { 224 tmp[0] = part2[i]; 225 convert(tmp); 226 (void)printf("%s", lflag ? " " : ""); 227 } 228 } 229 (void)printf("times ten to the%s", lflag ? " " : "\n"); 230 if (part3 && part3[0]) 231 convert(part3); 232 else 233 (void)printf("zero%s", lflag ? " " : ".\n"); 234 } 235 236 int 237 unit(int len, const char *p) 238 { 239 int off, rval; 240 241 rval = 0; 242 if (len > 3) { 243 if (len % 3) { 244 off = len % 3; 245 len -= off; 246 if (number(p, off)) { 247 rval = 1; 248 (void)printf(" %s%s", 249 name3[len / 3], lflag ? " " : ".\n"); 250 } 251 p += off; 252 } 253 for (; len > 3; p += 3) { 254 len -= 3; 255 if (number(p, 3)) { 256 rval = 1; 257 (void)printf(" %s%s", 258 name3[len / 3], lflag ? " " : ".\n"); 259 } 260 } 261 } 262 if (number(p, len)) { 263 if (!lflag) 264 (void)printf(".\n"); 265 rval = 1; 266 } 267 return (rval); 268 } 269 270 int 271 number(const char *p, int len) 272 { 273 int val, rval; 274 275 rval = 0; 276 switch (len) { 277 case 3: 278 if (*p != '0') { 279 rval = 1; 280 (void)printf("%s hundred", name1[*p - '0']); 281 } 282 ++p; 283 /* FALLTHROUGH */ 284 case 2: 285 val = (p[1] - '0') + (p[0] - '0') * 10; 286 if (val) { 287 if (rval) 288 (void)printf(" "); 289 if (val < 20) 290 (void)printf("%s", name1[val]); 291 else { 292 (void)printf("%s", name2[val / 10]); 293 if (val % 10) 294 (void)printf("-%s", name1[val % 10]); 295 } 296 rval = 1; 297 } 298 break; 299 case 1: 300 if (*p != '0') { 301 rval = 1; 302 (void)printf("%s", name1[*p - '0']); 303 } 304 } 305 return (rval); 306 } 307 308 void 309 pfract(int len) 310 { 311 static const char *const pref[] = { "", "ten-", "hundred-" }; 312 313 switch(len) { 314 case 1: 315 (void)printf("tenths%s", lflag ? "" : ".\n"); 316 break; 317 case 2: 318 (void)printf("hundredths%s", lflag ? "" : ".\n"); 319 break; 320 default: 321 (void)printf("%s%sths%s", pref[len % 3], name3[len / 3], 322 lflag ? "" : ".\n"); 323 break; 324 } 325 } 326 327 void 328 usage(void) 329 { 330 (void)fprintf(stderr, "usage: %s [-l] [--] [# ...]\n", getprogname()); 331 exit(1); 332 } 333