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 printf(fmt, cur); 185 fputs(sep, stdout); 186 prev = cur; 187 } 188 189 /* 190 * Did we miss the last value of the range in the loop above? 191 * 192 * We might have, so check if the printable version of the last 193 * computed value ('cur') and desired 'last' value are equal. If they 194 * are equal after formatting truncation, but 'cur' and 'prev' are not 195 * equal, it means the exit condition of the loop held true due to a 196 * rounding error and we still need to print 'last'. 197 */ 198 if (asprintf(&cur_print, fmt, cur) < 0 || 199 asprintf(&last_print, fmt, last) < 0 || 200 asprintf(&prev_print, fmt, prev) < 0) { 201 err(1, "asprintf"); 202 } 203 if (strcmp(cur_print, last_print) == 0 && 204 strcmp(cur_print, prev_print) != 0) { 205 fputs(last_print, stdout); 206 fputs(sep, stdout); 207 } 208 free(cur_print); 209 free(last_print); 210 free(prev_print); 211 212 if (term != NULL) 213 fputs(term, stdout); 214 215 return (0); 216 } 217 218 /* 219 * numeric - verify that string is numeric 220 */ 221 static int 222 numeric(const char *s) 223 { 224 int seen_decimal_pt, decimal_pt_len; 225 226 /* skip any sign */ 227 if (ISSIGN((unsigned char)*s)) 228 s++; 229 230 seen_decimal_pt = 0; 231 decimal_pt_len = strlen(decimal_point); 232 while (*s) { 233 if (!isdigit((unsigned char)*s)) { 234 if (!seen_decimal_pt && 235 strncmp(s, decimal_point, decimal_pt_len) == 0) { 236 s += decimal_pt_len; 237 seen_decimal_pt = 1; 238 continue; 239 } 240 if (ISEXP((unsigned char)*s)) { 241 s++; 242 if (ISSIGN((unsigned char)*s) || 243 isdigit((unsigned char)*s)) { 244 s++; 245 continue; 246 } 247 } 248 break; 249 } 250 s++; 251 } 252 return (*s == '\0'); 253 } 254 255 /* 256 * valid_format - validate user specified format string 257 */ 258 static int 259 valid_format(const char *fmt) 260 { 261 unsigned conversions = 0; 262 263 while (*fmt != '\0') { 264 /* scan for conversions */ 265 if (*fmt != '%') { 266 fmt++; 267 continue; 268 } 269 fmt++; 270 271 /* allow %% but not things like %10% */ 272 if (*fmt == '%') { 273 fmt++; 274 continue; 275 } 276 277 /* flags */ 278 while (*fmt != '\0' && strchr("#0- +'", *fmt)) { 279 fmt++; 280 } 281 282 /* field width */ 283 while (*fmt != '\0' && strchr("0123456789", *fmt)) { 284 fmt++; 285 } 286 287 /* precision */ 288 if (*fmt == '.') { 289 fmt++; 290 while (*fmt != '\0' && strchr("0123456789", *fmt)) { 291 fmt++; 292 } 293 } 294 295 /* conversion */ 296 switch (*fmt) { 297 case 'A': 298 case 'a': 299 case 'E': 300 case 'e': 301 case 'F': 302 case 'f': 303 case 'G': 304 case 'g': 305 /* floating point formats are accepted */ 306 conversions++; 307 break; 308 default: 309 /* anything else is not */ 310 return 0; 311 } 312 } 313 314 /* PR 236347 -- user format strings must have a conversion */ 315 return (conversions == 1); 316 } 317 318 /* 319 * unescape - handle C escapes in a string 320 */ 321 static char * 322 unescape(char *orig) 323 { 324 char c, *cp, *new = orig; 325 int i; 326 327 for (cp = orig; (*orig = *cp); cp++, orig++) { 328 if (*cp != '\\') 329 continue; 330 331 switch (*++cp) { 332 case 'a': /* alert (bell) */ 333 *orig = '\a'; 334 continue; 335 case 'b': /* backspace */ 336 *orig = '\b'; 337 continue; 338 case 'e': /* escape */ 339 *orig = '\e'; 340 continue; 341 case 'f': /* formfeed */ 342 *orig = '\f'; 343 continue; 344 case 'n': /* newline */ 345 *orig = '\n'; 346 continue; 347 case 'r': /* carriage return */ 348 *orig = '\r'; 349 continue; 350 case 't': /* horizontal tab */ 351 *orig = '\t'; 352 continue; 353 case 'v': /* vertical tab */ 354 *orig = '\v'; 355 continue; 356 case '\\': /* backslash */ 357 *orig = '\\'; 358 continue; 359 case '\'': /* single quote */ 360 *orig = '\''; 361 continue; 362 case '\"': /* double quote */ 363 *orig = '"'; 364 continue; 365 case '0': 366 case '1': 367 case '2': 368 case '3': /* octal */ 369 case '4': 370 case '5': 371 case '6': 372 case '7': /* number */ 373 for (i = 0, c = 0; 374 ISODIGIT((unsigned char)*cp) && i < 3; 375 i++, cp++) { 376 c <<= 3; 377 c |= (*cp - '0'); 378 } 379 *orig = c; 380 --cp; 381 continue; 382 case 'x': /* hexadecimal number */ 383 cp++; /* skip 'x' */ 384 for (i = 0, c = 0; 385 isxdigit((unsigned char)*cp) && i < 2; 386 i++, cp++) { 387 c <<= 4; 388 if (isdigit((unsigned char)*cp)) 389 c |= (*cp - '0'); 390 else 391 c |= ((toupper((unsigned char)*cp) - 392 'A') + 10); 393 } 394 *orig = c; 395 --cp; 396 continue; 397 default: 398 --cp; 399 break; 400 } 401 } 402 403 return (new); 404 } 405 406 /* 407 * e_atof - convert an ASCII string to a double 408 * exit if string is not a valid double, or if converted value would 409 * cause overflow or underflow 410 */ 411 static double 412 e_atof(const char *num) 413 { 414 char *endp; 415 double dbl; 416 417 errno = 0; 418 dbl = strtod(num, &endp); 419 420 if (errno == ERANGE) 421 /* under or overflow */ 422 err(2, "%s", num); 423 else if (*endp != '\0') 424 /* "junk" left in number */ 425 errx(2, "invalid floating point argument: %s", num); 426 427 /* zero shall have no sign */ 428 if (dbl == -0.0) 429 dbl = 0; 430 return (dbl); 431 } 432 433 /* 434 * decimal_places - count decimal places in a number (string) 435 */ 436 static int 437 decimal_places(const char *number) 438 { 439 int places = 0; 440 char *dp; 441 442 /* look for a decimal point */ 443 if ((dp = strstr(number, decimal_point))) { 444 dp += strlen(decimal_point); 445 446 while (isdigit((unsigned char)*dp++)) 447 places++; 448 } 449 return (places); 450 } 451 452 /* 453 * generate_format - create a format string 454 * 455 * XXX to be bug for bug compatible with Plan9 and GNU return "%g" 456 * when "%g" prints as "%e" (this way no width adjustments are made) 457 */ 458 static char * 459 generate_format(double first, double incr, double last, int equalize, char pad) 460 { 461 static char buf[256]; 462 char cc = '\0'; 463 int precision, width1, width2, places; 464 465 if (equalize == 0) 466 return (default_format); 467 468 /* figure out "last" value printed */ 469 if (first > last) 470 last = first - incr * floor((first - last) / incr); 471 else 472 last = first + incr * floor((last - first) / incr); 473 474 sprintf(buf, "%g", incr); 475 if (strchr(buf, 'e')) 476 cc = 'e'; 477 precision = decimal_places(buf); 478 479 width1 = sprintf(buf, "%g", first); 480 if (strchr(buf, 'e')) 481 cc = 'e'; 482 if ((places = decimal_places(buf))) 483 width1 -= (places + strlen(decimal_point)); 484 485 precision = MAX(places, precision); 486 487 width2 = sprintf(buf, "%g", last); 488 if (strchr(buf, 'e')) 489 cc = 'e'; 490 if ((places = decimal_places(buf))) 491 width2 -= (places + strlen(decimal_point)); 492 493 if (precision) { 494 sprintf(buf, "%%%c%d.%d%c", pad, 495 MAX(width1, width2) + (int) strlen(decimal_point) + 496 precision, precision, (cc) ? cc : 'f'); 497 } else { 498 sprintf(buf, "%%%c%d%c", pad, MAX(width1, width2), 499 (cc) ? cc : 'g'); 500 } 501 502 return (buf); 503 } 504