1 /* $NetBSD: seq.c,v 1.7 2010/05/27 08:40:19 dholland Exp $ */ 2 /*- 3 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 4 * 5 * Copyright (c) 2005 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Brian Ginsbach. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <ctype.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <math.h> 40 #include <locale.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 #define ZERO '0' 47 #define SPACE ' ' 48 49 #define MAX(a, b) (((a) < (b))? (b) : (a)) 50 #define ISSIGN(c) ((int)(c) == '-' || (int)(c) == '+') 51 #define ISEXP(c) ((int)(c) == 'e' || (int)(c) == 'E') 52 #define ISODIGIT(c) ((int)(c) >= '0' && (int)(c) <= '7') 53 54 /* Globals */ 55 56 static const char *decimal_point = "."; /* default */ 57 static char default_format[] = { "%g" }; /* default */ 58 59 /* Prototypes */ 60 61 static double e_atof(const char *); 62 63 static int decimal_places(const char *); 64 static int numeric(const char *); 65 static int valid_format(const char *); 66 67 static char *generate_format(double, double, double, int, char); 68 static char *unescape(char *); 69 70 /* 71 * The seq command will print out a numeric sequence from 1, the default, 72 * to a user specified upper limit by 1. The lower bound and increment 73 * maybe indicated by the user on the command line. The sequence can 74 * be either whole, the default, or decimal numbers. 75 */ 76 int 77 main(int argc, char *argv[]) 78 { 79 const char *sep, *term; 80 struct lconv *locale; 81 char pad, *fmt, *cur_print, *last_print; 82 double first, last, incr, last_shown_value, cur, step; 83 int c, errflg, equalize; 84 85 pad = ZERO; 86 fmt = NULL; 87 first = 1.0; 88 last = incr = last_shown_value = 0.0; 89 c = errflg = equalize = 0; 90 sep = "\n"; 91 term = NULL; 92 93 /* Determine the locale's decimal point. */ 94 locale = localeconv(); 95 if (locale && locale->decimal_point && locale->decimal_point[0] != '\0') 96 decimal_point = locale->decimal_point; 97 98 /* 99 * Process options, but handle negative numbers separately 100 * least they trip up getopt(3). 101 */ 102 while ((optind < argc) && !numeric(argv[optind]) && 103 (c = getopt(argc, argv, "f:hs:t:w")) != -1) { 104 105 switch (c) { 106 case 'f': /* format (plan9) */ 107 fmt = optarg; 108 equalize = 0; 109 break; 110 case 's': /* separator (GNU) */ 111 sep = unescape(optarg); 112 break; 113 case 't': /* terminator (new) */ 114 term = unescape(optarg); 115 break; 116 case 'w': /* equal width (plan9) */ 117 if (!fmt) 118 if (equalize++) 119 pad = SPACE; 120 break; 121 case 'h': /* help (GNU) */ 122 default: 123 errflg++; 124 break; 125 } 126 } 127 128 argc -= optind; 129 argv += optind; 130 if (argc < 1 || argc > 3) 131 errflg++; 132 133 if (errflg) { 134 fprintf(stderr, 135 "usage: %s [-w] [-f format] [-s string] [-t string] [first [incr]] last\n", 136 getprogname()); 137 exit(1); 138 } 139 140 last = e_atof(argv[argc - 1]); 141 142 if (argc > 1) 143 first = e_atof(argv[0]); 144 145 if (argc > 2) { 146 incr = e_atof(argv[1]); 147 /* Plan 9/GNU don't do zero */ 148 if (incr == 0.0) 149 errx(1, "zero %screment", (first < last)? "in" : "de"); 150 } 151 152 /* default is one for Plan 9/GNU work alike */ 153 if (incr == 0.0) 154 incr = (first < last) ? 1.0 : -1.0; 155 156 if (incr <= 0.0 && first < last) 157 errx(1, "needs positive increment"); 158 159 if (incr >= 0.0 && first > last) 160 errx(1, "needs negative decrement"); 161 162 if (fmt != NULL) { 163 if (!valid_format(fmt)) 164 errx(1, "invalid format string: `%s'", fmt); 165 fmt = unescape(fmt); 166 if (!valid_format(fmt)) 167 errx(1, "invalid format string"); 168 /* 169 * XXX to be bug for bug compatible with Plan 9 add a 170 * newline if none found at the end of the format string. 171 */ 172 } else 173 fmt = generate_format(first, incr, last, equalize, pad); 174 175 for (step = 1, cur = first; incr > 0 ? cur <= last : cur >= last; 176 cur = first + incr * step++) { 177 printf(fmt, cur); 178 fputs(sep, stdout); 179 last_shown_value = cur; 180 } 181 182 /* 183 * Did we miss the last value of the range in the loop above? 184 * 185 * We might have, so check if the printable version of the last 186 * computed value ('cur') and desired 'last' value are equal. If they 187 * are equal after formatting truncation, but 'cur' and 188 * 'last_shown_value' are not equal, it means the exit condition of the 189 * loop held true due to a rounding error and we still need to print 190 * 'last'. 191 */ 192 asprintf(&cur_print, fmt, cur); 193 asprintf(&last_print, fmt, last); 194 if (strcmp(cur_print, last_print) == 0 && cur != last_shown_value) { 195 fputs(last_print, stdout); 196 fputs(sep, stdout); 197 } 198 free(cur_print); 199 free(last_print); 200 201 if (term != NULL) 202 fputs(term, stdout); 203 204 return (0); 205 } 206 207 /* 208 * numeric - verify that string is numeric 209 */ 210 static int 211 numeric(const char *s) 212 { 213 int seen_decimal_pt, decimal_pt_len; 214 215 /* skip any sign */ 216 if (ISSIGN((unsigned char)*s)) 217 s++; 218 219 seen_decimal_pt = 0; 220 decimal_pt_len = strlen(decimal_point); 221 while (*s) { 222 if (!isdigit((unsigned char)*s)) { 223 if (!seen_decimal_pt && 224 strncmp(s, decimal_point, decimal_pt_len) == 0) { 225 s += decimal_pt_len; 226 seen_decimal_pt = 1; 227 continue; 228 } 229 if (ISEXP((unsigned char)*s)) { 230 s++; 231 if (ISSIGN((unsigned char)*s) || 232 isdigit((unsigned char)*s)) { 233 s++; 234 continue; 235 } 236 } 237 break; 238 } 239 s++; 240 } 241 return (*s == '\0'); 242 } 243 244 /* 245 * valid_format - validate user specified format string 246 */ 247 static int 248 valid_format(const char *fmt) 249 { 250 unsigned conversions = 0; 251 252 while (*fmt != '\0') { 253 /* scan for conversions */ 254 if (*fmt != '%') { 255 fmt++; 256 continue; 257 } 258 fmt++; 259 260 /* allow %% but not things like %10% */ 261 if (*fmt == '%') { 262 fmt++; 263 continue; 264 } 265 266 /* flags */ 267 while (*fmt != '\0' && strchr("#0- +'", *fmt)) { 268 fmt++; 269 } 270 271 /* field width */ 272 while (*fmt != '\0' && strchr("0123456789", *fmt)) { 273 fmt++; 274 } 275 276 /* precision */ 277 if (*fmt == '.') { 278 fmt++; 279 while (*fmt != '\0' && strchr("0123456789", *fmt)) { 280 fmt++; 281 } 282 } 283 284 /* conversion */ 285 switch (*fmt) { 286 case 'A': 287 case 'a': 288 case 'E': 289 case 'e': 290 case 'F': 291 case 'f': 292 case 'G': 293 case 'g': 294 /* floating point formats are accepted */ 295 conversions++; 296 break; 297 default: 298 /* anything else is not */ 299 return 0; 300 } 301 } 302 303 return (conversions <= 1); 304 } 305 306 /* 307 * unescape - handle C escapes in a string 308 */ 309 static char * 310 unescape(char *orig) 311 { 312 char c, *cp, *new = orig; 313 int i; 314 315 for (cp = orig; (*orig = *cp); cp++, orig++) { 316 if (*cp != '\\') 317 continue; 318 319 switch (*++cp) { 320 case 'a': /* alert (bell) */ 321 *orig = '\a'; 322 continue; 323 case 'b': /* backspace */ 324 *orig = '\b'; 325 continue; 326 case 'e': /* escape */ 327 *orig = '\e'; 328 continue; 329 case 'f': /* formfeed */ 330 *orig = '\f'; 331 continue; 332 case 'n': /* newline */ 333 *orig = '\n'; 334 continue; 335 case 'r': /* carriage return */ 336 *orig = '\r'; 337 continue; 338 case 't': /* horizontal tab */ 339 *orig = '\t'; 340 continue; 341 case 'v': /* vertical tab */ 342 *orig = '\v'; 343 continue; 344 case '\\': /* backslash */ 345 *orig = '\\'; 346 continue; 347 case '\'': /* single quote */ 348 *orig = '\''; 349 continue; 350 case '\"': /* double quote */ 351 *orig = '"'; 352 continue; 353 case '0': 354 case '1': 355 case '2': 356 case '3': /* octal */ 357 case '4': 358 case '5': 359 case '6': 360 case '7': /* number */ 361 for (i = 0, c = 0; 362 ISODIGIT((unsigned char)*cp) && i < 3; 363 i++, cp++) { 364 c <<= 3; 365 c |= (*cp - '0'); 366 } 367 *orig = c; 368 --cp; 369 continue; 370 case 'x': /* hexadecimal number */ 371 cp++; /* skip 'x' */ 372 for (i = 0, c = 0; 373 isxdigit((unsigned char)*cp) && i < 2; 374 i++, cp++) { 375 c <<= 4; 376 if (isdigit((unsigned char)*cp)) 377 c |= (*cp - '0'); 378 else 379 c |= ((toupper((unsigned char)*cp) - 380 'A') + 10); 381 } 382 *orig = c; 383 --cp; 384 continue; 385 default: 386 --cp; 387 break; 388 } 389 } 390 391 return (new); 392 } 393 394 /* 395 * e_atof - convert an ASCII string to a double 396 * exit if string is not a valid double, or if converted value would 397 * cause overflow or underflow 398 */ 399 static double 400 e_atof(const char *num) 401 { 402 char *endp; 403 double dbl; 404 405 errno = 0; 406 dbl = strtod(num, &endp); 407 408 if (errno == ERANGE) 409 /* under or overflow */ 410 err(2, "%s", num); 411 else if (*endp != '\0') 412 /* "junk" left in number */ 413 errx(2, "invalid floating point argument: %s", num); 414 415 /* zero shall have no sign */ 416 if (dbl == -0.0) 417 dbl = 0; 418 return (dbl); 419 } 420 421 /* 422 * decimal_places - count decimal places in a number (string) 423 */ 424 static int 425 decimal_places(const char *number) 426 { 427 int places = 0; 428 char *dp; 429 430 /* look for a decimal point */ 431 if ((dp = strstr(number, decimal_point))) { 432 dp += strlen(decimal_point); 433 434 while (isdigit((unsigned char)*dp++)) 435 places++; 436 } 437 return (places); 438 } 439 440 /* 441 * generate_format - create a format string 442 * 443 * XXX to be bug for bug compatible with Plan9 and GNU return "%g" 444 * when "%g" prints as "%e" (this way no width adjustments are made) 445 */ 446 static char * 447 generate_format(double first, double incr, double last, int equalize, char pad) 448 { 449 static char buf[256]; 450 char cc = '\0'; 451 int precision, width1, width2, places; 452 453 if (equalize == 0) 454 return (default_format); 455 456 /* figure out "last" value printed */ 457 if (first > last) 458 last = first - incr * floor((first - last) / incr); 459 else 460 last = first + incr * floor((last - first) / incr); 461 462 sprintf(buf, "%g", incr); 463 if (strchr(buf, 'e')) 464 cc = 'e'; 465 precision = decimal_places(buf); 466 467 width1 = sprintf(buf, "%g", first); 468 if (strchr(buf, 'e')) 469 cc = 'e'; 470 if ((places = decimal_places(buf))) 471 width1 -= (places + strlen(decimal_point)); 472 473 precision = MAX(places, precision); 474 475 width2 = sprintf(buf, "%g", last); 476 if (strchr(buf, 'e')) 477 cc = 'e'; 478 if ((places = decimal_places(buf))) 479 width2 -= (places + strlen(decimal_point)); 480 481 if (precision) { 482 sprintf(buf, "%%%c%d.%d%c", pad, 483 MAX(width1, width2) + (int) strlen(decimal_point) + 484 precision, precision, (cc) ? cc : 'f'); 485 } else { 486 sprintf(buf, "%%%c%d%c", pad, MAX(width1, width2), 487 (cc) ? cc : 'g'); 488 } 489 490 return (buf); 491 } 492