1 /* $NetBSD: seq.c,v 1.7 2010/05/27 08:40:19 dholland Exp $ */ 2 /*- 3 * SPDX-License-Identifier: BSD-2-Clause 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 #include <ctype.h> 35 #include <err.h> 36 #include <errno.h> 37 #include <getopt.h> 38 #include <math.h> 39 #include <locale.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 #define ZERO '0' 46 #define SPACE ' ' 47 48 #define MAX(a, b) (((a) < (b))? (b) : (a)) 49 #define ISSIGN(c) ((int)(c) == '-' || (int)(c) == '+') 50 #define ISEXP(c) ((int)(c) == 'e' || (int)(c) == 'E') 51 #define ISODIGIT(c) ((int)(c) >= '0' && (int)(c) <= '7') 52 53 /* Globals */ 54 55 static const char *decimal_point = "."; /* default */ 56 static char default_format[] = { "%g" }; /* default */ 57 58 static const struct option long_opts[] = { 59 {"format", required_argument, NULL, 'f'}, 60 {"separator", required_argument, NULL, 's'}, 61 {"terminator", required_argument, NULL, 't'}, 62 {"equal-width", no_argument, NULL, 'w'}, 63 {NULL, no_argument, NULL, 0} 64 }; 65 66 /* Prototypes */ 67 68 static double e_atof(const char *); 69 70 static int decimal_places(const char *); 71 static int numeric(const char *); 72 static int valid_format(const char *); 73 74 static char *generate_format(double, double, double, int, char); 75 static char *unescape(char *); 76 77 /* 78 * The seq command will print out a numeric sequence from 1, the default, 79 * to a user specified upper limit by 1. The lower bound and increment 80 * maybe indicated by the user on the command line. The sequence can 81 * be either whole, the default, or decimal numbers. 82 */ 83 int 84 main(int argc, char *argv[]) 85 { 86 const char *sep, *term; 87 struct lconv *locale; 88 char pad, *fmt, *cur_print, *last_print, *prev_print; 89 double first, last, incr, prev, cur, step; 90 int c, errflg, equalize; 91 92 pad = ZERO; 93 fmt = NULL; 94 first = 1.0; 95 last = incr = prev = 0.0; 96 c = errflg = equalize = 0; 97 sep = "\n"; 98 term = NULL; 99 100 /* Determine the locale's decimal point. */ 101 locale = localeconv(); 102 if (locale && locale->decimal_point && locale->decimal_point[0] != '\0') 103 decimal_point = locale->decimal_point; 104 105 /* 106 * Process options, but handle negative numbers separately 107 * least they trip up getopt(3). 108 */ 109 while ((optind < argc) && !numeric(argv[optind]) && 110 (c = getopt_long(argc, argv, "+f:hs:t:w", long_opts, NULL)) != -1) { 111 112 switch (c) { 113 case 'f': /* format (plan9) */ 114 fmt = optarg; 115 equalize = 0; 116 break; 117 case 's': /* separator (GNU) */ 118 sep = unescape(optarg); 119 break; 120 case 't': /* terminator (new) */ 121 term = unescape(optarg); 122 break; 123 case 'w': /* equal width (plan9) */ 124 if (!fmt) 125 if (equalize++) 126 pad = SPACE; 127 break; 128 case 'h': /* help (GNU) */ 129 default: 130 errflg++; 131 break; 132 } 133 } 134 135 argc -= optind; 136 argv += optind; 137 if (argc < 1 || argc > 3) 138 errflg++; 139 140 if (errflg) { 141 fprintf(stderr, 142 "usage: %s [-w] [-f format] [-s string] [-t string] [first [incr]] last\n", 143 getprogname()); 144 exit(1); 145 } 146 147 last = e_atof(argv[argc - 1]); 148 149 if (argc > 1) 150 first = e_atof(argv[0]); 151 152 if (argc > 2) { 153 incr = e_atof(argv[1]); 154 /* Plan 9/GNU don't do zero */ 155 if (incr == 0.0) 156 errx(1, "zero %screment", (first < last) ? "in" : "de"); 157 } 158 159 /* default is one for Plan 9/GNU work alike */ 160 if (incr == 0.0) 161 incr = (first < last) ? 1.0 : -1.0; 162 163 if (incr <= 0.0 && first < last) 164 errx(1, "needs positive increment"); 165 166 if (incr >= 0.0 && first > last) 167 errx(1, "needs negative decrement"); 168 169 if (fmt != NULL) { 170 if (!valid_format(fmt)) 171 errx(1, "invalid format string: `%s'", fmt); 172 fmt = unescape(fmt); 173 if (!valid_format(fmt)) 174 errx(1, "invalid format string"); 175 /* 176 * XXX to be bug for bug compatible with Plan 9 add a 177 * newline if none found at the end of the format string. 178 */ 179 } else 180 fmt = generate_format(first, incr, last, equalize, pad); 181 182 for (step = 1, cur = first; incr > 0 ? cur <= last : cur >= last; 183 cur = first + incr * step++) { 184 if (step > 1) 185 fputs(sep, stdout); 186 printf(fmt, cur); 187 prev = cur; 188 } 189 190 /* 191 * Did we miss the last value of the range in the loop above? 192 * 193 * We might have, so check if the printable version of the last 194 * computed value ('cur') and desired 'last' value are equal. If they 195 * are equal after formatting truncation, but 'cur' and 'prev' are not 196 * equal, it means the exit condition of the loop held true due to a 197 * rounding error and we still need to print 'last'. 198 */ 199 if (asprintf(&cur_print, fmt, cur) < 0 || 200 asprintf(&last_print, fmt, last) < 0 || 201 asprintf(&prev_print, fmt, prev) < 0) { 202 err(1, "asprintf"); 203 } 204 if (strcmp(cur_print, last_print) == 0 && 205 strcmp(cur_print, prev_print) != 0) { 206 fputs(sep, stdout); 207 fputs(last_print, stdout); 208 } 209 free(cur_print); 210 free(last_print); 211 free(prev_print); 212 213 if (term != NULL) { 214 fputs(sep, stdout); 215 fputs(term, stdout); 216 } 217 218 fputs("\n", stdout); 219 220 return (0); 221 } 222 223 /* 224 * numeric - verify that string is numeric 225 */ 226 static int 227 numeric(const char *s) 228 { 229 int seen_decimal_pt, decimal_pt_len; 230 231 /* skip any sign */ 232 if (ISSIGN((unsigned char)*s)) 233 s++; 234 235 seen_decimal_pt = 0; 236 decimal_pt_len = strlen(decimal_point); 237 while (*s) { 238 if (!isdigit((unsigned char)*s)) { 239 if (!seen_decimal_pt && 240 strncmp(s, decimal_point, decimal_pt_len) == 0) { 241 s += decimal_pt_len; 242 seen_decimal_pt = 1; 243 continue; 244 } 245 if (ISEXP((unsigned char)*s)) { 246 s++; 247 if (ISSIGN((unsigned char)*s) || 248 isdigit((unsigned char)*s)) { 249 s++; 250 continue; 251 } 252 } 253 break; 254 } 255 s++; 256 } 257 return (*s == '\0'); 258 } 259 260 /* 261 * valid_format - validate user specified format string 262 */ 263 static int 264 valid_format(const char *fmt) 265 { 266 unsigned conversions = 0; 267 268 while (*fmt != '\0') { 269 /* scan for conversions */ 270 if (*fmt != '%') { 271 fmt++; 272 continue; 273 } 274 fmt++; 275 276 /* allow %% but not things like %10% */ 277 if (*fmt == '%') { 278 fmt++; 279 continue; 280 } 281 282 /* flags */ 283 while (*fmt != '\0' && strchr("#0- +'", *fmt)) { 284 fmt++; 285 } 286 287 /* field width */ 288 while (*fmt != '\0' && strchr("0123456789", *fmt)) { 289 fmt++; 290 } 291 292 /* precision */ 293 if (*fmt == '.') { 294 fmt++; 295 while (*fmt != '\0' && strchr("0123456789", *fmt)) { 296 fmt++; 297 } 298 } 299 300 /* conversion */ 301 switch (*fmt) { 302 case 'A': 303 case 'a': 304 case 'E': 305 case 'e': 306 case 'F': 307 case 'f': 308 case 'G': 309 case 'g': 310 /* floating point formats are accepted */ 311 conversions++; 312 break; 313 default: 314 /* anything else is not */ 315 return 0; 316 } 317 } 318 319 /* PR 236347 -- user format strings must have a conversion */ 320 return (conversions == 1); 321 } 322 323 /* 324 * unescape - handle C escapes in a string 325 */ 326 static char * 327 unescape(char *orig) 328 { 329 char c, *cp, *new = orig; 330 int i; 331 332 for (cp = orig; (*orig = *cp); cp++, orig++) { 333 if (*cp != '\\') 334 continue; 335 336 switch (*++cp) { 337 case 'a': /* alert (bell) */ 338 *orig = '\a'; 339 continue; 340 case 'b': /* backspace */ 341 *orig = '\b'; 342 continue; 343 case 'e': /* escape */ 344 *orig = '\e'; 345 continue; 346 case 'f': /* formfeed */ 347 *orig = '\f'; 348 continue; 349 case 'n': /* newline */ 350 *orig = '\n'; 351 continue; 352 case 'r': /* carriage return */ 353 *orig = '\r'; 354 continue; 355 case 't': /* horizontal tab */ 356 *orig = '\t'; 357 continue; 358 case 'v': /* vertical tab */ 359 *orig = '\v'; 360 continue; 361 case '\\': /* backslash */ 362 *orig = '\\'; 363 continue; 364 case '\'': /* single quote */ 365 *orig = '\''; 366 continue; 367 case '\"': /* double quote */ 368 *orig = '"'; 369 continue; 370 case '0': 371 case '1': 372 case '2': 373 case '3': /* octal */ 374 case '4': 375 case '5': 376 case '6': 377 case '7': /* number */ 378 for (i = 0, c = 0; 379 ISODIGIT((unsigned char)*cp) && i < 3; 380 i++, cp++) { 381 c <<= 3; 382 c |= (*cp - '0'); 383 } 384 *orig = c; 385 --cp; 386 continue; 387 case 'x': /* hexadecimal number */ 388 cp++; /* skip 'x' */ 389 for (i = 0, c = 0; 390 isxdigit((unsigned char)*cp) && i < 2; 391 i++, cp++) { 392 c <<= 4; 393 if (isdigit((unsigned char)*cp)) 394 c |= (*cp - '0'); 395 else 396 c |= ((toupper((unsigned char)*cp) - 397 'A') + 10); 398 } 399 *orig = c; 400 --cp; 401 continue; 402 default: 403 --cp; 404 break; 405 } 406 } 407 408 return (new); 409 } 410 411 /* 412 * e_atof - convert an ASCII string to a double 413 * exit if string is not a valid double, or if converted value would 414 * cause overflow or underflow 415 */ 416 static double 417 e_atof(const char *num) 418 { 419 char *endp; 420 double dbl; 421 422 errno = 0; 423 dbl = strtod(num, &endp); 424 425 if (errno == ERANGE) 426 /* under or overflow */ 427 err(2, "%s", num); 428 else if (*endp != '\0') 429 /* "junk" left in number */ 430 errx(2, "invalid floating point argument: %s", num); 431 432 /* zero shall have no sign */ 433 if (dbl == -0.0) 434 dbl = 0; 435 return (dbl); 436 } 437 438 /* 439 * decimal_places - count decimal places in a number (string) 440 */ 441 static int 442 decimal_places(const char *number) 443 { 444 int places = 0; 445 char *dp; 446 447 /* look for a decimal point */ 448 if ((dp = strstr(number, decimal_point))) { 449 dp += strlen(decimal_point); 450 451 while (isdigit((unsigned char)*dp++)) 452 places++; 453 } 454 return (places); 455 } 456 457 /* 458 * generate_format - create a format string 459 * 460 * XXX to be bug for bug compatible with Plan9 and GNU return "%g" 461 * when "%g" prints as "%e" (this way no width adjustments are made) 462 */ 463 static char * 464 generate_format(double first, double incr, double last, int equalize, char pad) 465 { 466 static char buf[256]; 467 char cc = '\0'; 468 int precision, width1, width2, places; 469 470 if (equalize == 0) 471 return (default_format); 472 473 /* figure out "last" value printed */ 474 if (first > last) 475 last = first - incr * floor((first - last) / incr); 476 else 477 last = first + incr * floor((last - first) / incr); 478 479 sprintf(buf, "%g", incr); 480 if (strchr(buf, 'e')) 481 cc = 'e'; 482 precision = decimal_places(buf); 483 484 width1 = sprintf(buf, "%g", first); 485 if (strchr(buf, 'e')) 486 cc = 'e'; 487 if ((places = decimal_places(buf))) 488 width1 -= (places + strlen(decimal_point)); 489 490 precision = MAX(places, precision); 491 492 width2 = sprintf(buf, "%g", last); 493 if (strchr(buf, 'e')) 494 cc = 'e'; 495 if ((places = decimal_places(buf))) 496 width2 -= (places + strlen(decimal_point)); 497 498 if (precision) { 499 sprintf(buf, "%%%c%d.%d%c", pad, 500 MAX(width1, width2) + (int) strlen(decimal_point) + 501 precision, precision, (cc) ? cc : 'f'); 502 } else { 503 sprintf(buf, "%%%c%d%c", pad, MAX(width1, width2), 504 (cc) ? cc : 'g'); 505 } 506 507 return (buf); 508 } 509