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 __FBSDID("$FreeBSD$"); 35 36 #include <ctype.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <getopt.h> 40 #include <math.h> 41 #include <locale.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #define ZERO '0' 48 #define SPACE ' ' 49 50 #define MAX(a, b) (((a) < (b))? (b) : (a)) 51 #define ISSIGN(c) ((int)(c) == '-' || (int)(c) == '+') 52 #define ISEXP(c) ((int)(c) == 'e' || (int)(c) == 'E') 53 #define ISODIGIT(c) ((int)(c) >= '0' && (int)(c) <= '7') 54 55 /* Globals */ 56 57 static const char *decimal_point = "."; /* default */ 58 static char default_format[] = { "%g" }; /* default */ 59 60 static const struct option long_opts[] = 61 { 62 {"format", required_argument, NULL, 'f'}, 63 {"separator", required_argument, NULL, 's'}, 64 {"terminator", required_argument, NULL, 't'}, 65 {"equal-width", no_argument, NULL, 'w'}, 66 {NULL, no_argument, NULL, 0} 67 }; 68 69 /* Prototypes */ 70 71 static double e_atof(const char *); 72 73 static int decimal_places(const char *); 74 static int numeric(const char *); 75 static int valid_format(const char *); 76 77 static char *generate_format(double, double, double, int, char); 78 static char *unescape(char *); 79 80 /* 81 * The seq command will print out a numeric sequence from 1, the default, 82 * to a user specified upper limit by 1. The lower bound and increment 83 * maybe indicated by the user on the command line. The sequence can 84 * be either whole, the default, or decimal numbers. 85 */ 86 int 87 main(int argc, char *argv[]) 88 { 89 const char *sep, *term; 90 struct lconv *locale; 91 char pad, *fmt, *cur_print, *last_print, *prev_print; 92 double first, last, incr, prev, cur, step; 93 int c, errflg, equalize; 94 95 pad = ZERO; 96 fmt = NULL; 97 first = 1.0; 98 last = incr = prev = 0.0; 99 c = errflg = equalize = 0; 100 sep = "\n"; 101 term = NULL; 102 103 /* Determine the locale's decimal point. */ 104 locale = localeconv(); 105 if (locale && locale->decimal_point && locale->decimal_point[0] != '\0') 106 decimal_point = locale->decimal_point; 107 108 /* 109 * Process options, but handle negative numbers separately 110 * least they trip up getopt(3). 111 */ 112 while ((optind < argc) && !numeric(argv[optind]) && 113 (c = getopt_long(argc, argv, "+f:hs:t:w", long_opts, NULL)) != -1) { 114 115 switch (c) { 116 case 'f': /* format (plan9) */ 117 fmt = optarg; 118 equalize = 0; 119 break; 120 case 's': /* separator (GNU) */ 121 sep = unescape(optarg); 122 break; 123 case 't': /* terminator (new) */ 124 term = unescape(optarg); 125 break; 126 case 'w': /* equal width (plan9) */ 127 if (!fmt) 128 if (equalize++) 129 pad = SPACE; 130 break; 131 case 'h': /* help (GNU) */ 132 default: 133 errflg++; 134 break; 135 } 136 } 137 138 argc -= optind; 139 argv += optind; 140 if (argc < 1 || argc > 3) 141 errflg++; 142 143 if (errflg) { 144 fprintf(stderr, 145 "usage: %s [-w] [-f format] [-s string] [-t string] [first [incr]] last\n", 146 getprogname()); 147 exit(1); 148 } 149 150 last = e_atof(argv[argc - 1]); 151 152 if (argc > 1) 153 first = e_atof(argv[0]); 154 155 if (argc > 2) { 156 incr = e_atof(argv[1]); 157 /* Plan 9/GNU don't do zero */ 158 if (incr == 0.0) 159 errx(1, "zero %screment", (first < last)? "in" : "de"); 160 } 161 162 /* default is one for Plan 9/GNU work alike */ 163 if (incr == 0.0) 164 incr = (first < last) ? 1.0 : -1.0; 165 166 if (incr <= 0.0 && first < last) 167 errx(1, "needs positive increment"); 168 169 if (incr >= 0.0 && first > last) 170 errx(1, "needs negative decrement"); 171 172 if (fmt != NULL) { 173 if (!valid_format(fmt)) 174 errx(1, "invalid format string: `%s'", fmt); 175 fmt = unescape(fmt); 176 if (!valid_format(fmt)) 177 errx(1, "invalid format string"); 178 /* 179 * XXX to be bug for bug compatible with Plan 9 add a 180 * newline if none found at the end of the format string. 181 */ 182 } else 183 fmt = generate_format(first, incr, last, equalize, pad); 184 185 for (step = 1, cur = first; incr > 0 ? cur <= last : cur >= last; 186 cur = first + incr * step++) { 187 printf(fmt, cur); 188 fputs(sep, stdout); 189 prev = cur; 190 } 191 192 /* 193 * Did we miss the last value of the range in the loop above? 194 * 195 * We might have, so check if the printable version of the last 196 * computed value ('cur') and desired 'last' value are equal. If they 197 * are equal after formatting truncation, but 'cur' and 'prev' are not 198 * equal, it means the exit condition of the loop held true due to a 199 * rounding error and we still need to print 'last'. 200 */ 201 if (asprintf(&cur_print, fmt, cur) < 0) { 202 err(1, "asprintf"); 203 } 204 if (asprintf(&last_print, fmt, last) < 0) { 205 err(1, "asprintf"); 206 } 207 if (asprintf(&prev_print, fmt, prev) < 0) { 208 err(1, "asprintf"); 209 } 210 if (strcmp(cur_print, last_print) == 0 && 211 strcmp(cur_print, prev_print) != 0) { 212 fputs(last_print, stdout); 213 fputs(sep, stdout); 214 } 215 free(cur_print); 216 free(last_print); 217 free(prev_print); 218 219 if (term != NULL) 220 fputs(term, stdout); 221 222 return (0); 223 } 224 225 /* 226 * numeric - verify that string is numeric 227 */ 228 static int 229 numeric(const char *s) 230 { 231 int seen_decimal_pt, decimal_pt_len; 232 233 /* skip any sign */ 234 if (ISSIGN((unsigned char)*s)) 235 s++; 236 237 seen_decimal_pt = 0; 238 decimal_pt_len = strlen(decimal_point); 239 while (*s) { 240 if (!isdigit((unsigned char)*s)) { 241 if (!seen_decimal_pt && 242 strncmp(s, decimal_point, decimal_pt_len) == 0) { 243 s += decimal_pt_len; 244 seen_decimal_pt = 1; 245 continue; 246 } 247 if (ISEXP((unsigned char)*s)) { 248 s++; 249 if (ISSIGN((unsigned char)*s) || 250 isdigit((unsigned char)*s)) { 251 s++; 252 continue; 253 } 254 } 255 break; 256 } 257 s++; 258 } 259 return (*s == '\0'); 260 } 261 262 /* 263 * valid_format - validate user specified format string 264 */ 265 static int 266 valid_format(const char *fmt) 267 { 268 unsigned conversions = 0; 269 270 while (*fmt != '\0') { 271 /* scan for conversions */ 272 if (*fmt != '%') { 273 fmt++; 274 continue; 275 } 276 fmt++; 277 278 /* allow %% but not things like %10% */ 279 if (*fmt == '%') { 280 fmt++; 281 continue; 282 } 283 284 /* flags */ 285 while (*fmt != '\0' && strchr("#0- +'", *fmt)) { 286 fmt++; 287 } 288 289 /* field width */ 290 while (*fmt != '\0' && strchr("0123456789", *fmt)) { 291 fmt++; 292 } 293 294 /* precision */ 295 if (*fmt == '.') { 296 fmt++; 297 while (*fmt != '\0' && strchr("0123456789", *fmt)) { 298 fmt++; 299 } 300 } 301 302 /* conversion */ 303 switch (*fmt) { 304 case 'A': 305 case 'a': 306 case 'E': 307 case 'e': 308 case 'F': 309 case 'f': 310 case 'G': 311 case 'g': 312 /* floating point formats are accepted */ 313 conversions++; 314 break; 315 default: 316 /* anything else is not */ 317 return 0; 318 } 319 } 320 321 /* PR 236347 -- user format strings must have a conversion */ 322 return (conversions == 1); 323 } 324 325 /* 326 * unescape - handle C escapes in a string 327 */ 328 static char * 329 unescape(char *orig) 330 { 331 char c, *cp, *new = orig; 332 int i; 333 334 for (cp = orig; (*orig = *cp); cp++, orig++) { 335 if (*cp != '\\') 336 continue; 337 338 switch (*++cp) { 339 case 'a': /* alert (bell) */ 340 *orig = '\a'; 341 continue; 342 case 'b': /* backspace */ 343 *orig = '\b'; 344 continue; 345 case 'e': /* escape */ 346 *orig = '\e'; 347 continue; 348 case 'f': /* formfeed */ 349 *orig = '\f'; 350 continue; 351 case 'n': /* newline */ 352 *orig = '\n'; 353 continue; 354 case 'r': /* carriage return */ 355 *orig = '\r'; 356 continue; 357 case 't': /* horizontal tab */ 358 *orig = '\t'; 359 continue; 360 case 'v': /* vertical tab */ 361 *orig = '\v'; 362 continue; 363 case '\\': /* backslash */ 364 *orig = '\\'; 365 continue; 366 case '\'': /* single quote */ 367 *orig = '\''; 368 continue; 369 case '\"': /* double quote */ 370 *orig = '"'; 371 continue; 372 case '0': 373 case '1': 374 case '2': 375 case '3': /* octal */ 376 case '4': 377 case '5': 378 case '6': 379 case '7': /* number */ 380 for (i = 0, c = 0; 381 ISODIGIT((unsigned char)*cp) && i < 3; 382 i++, cp++) { 383 c <<= 3; 384 c |= (*cp - '0'); 385 } 386 *orig = c; 387 --cp; 388 continue; 389 case 'x': /* hexadecimal number */ 390 cp++; /* skip 'x' */ 391 for (i = 0, c = 0; 392 isxdigit((unsigned char)*cp) && i < 2; 393 i++, cp++) { 394 c <<= 4; 395 if (isdigit((unsigned char)*cp)) 396 c |= (*cp - '0'); 397 else 398 c |= ((toupper((unsigned char)*cp) - 399 'A') + 10); 400 } 401 *orig = c; 402 --cp; 403 continue; 404 default: 405 --cp; 406 break; 407 } 408 } 409 410 return (new); 411 } 412 413 /* 414 * e_atof - convert an ASCII string to a double 415 * exit if string is not a valid double, or if converted value would 416 * cause overflow or underflow 417 */ 418 static double 419 e_atof(const char *num) 420 { 421 char *endp; 422 double dbl; 423 424 errno = 0; 425 dbl = strtod(num, &endp); 426 427 if (errno == ERANGE) 428 /* under or overflow */ 429 err(2, "%s", num); 430 else if (*endp != '\0') 431 /* "junk" left in number */ 432 errx(2, "invalid floating point argument: %s", num); 433 434 /* zero shall have no sign */ 435 if (dbl == -0.0) 436 dbl = 0; 437 return (dbl); 438 } 439 440 /* 441 * decimal_places - count decimal places in a number (string) 442 */ 443 static int 444 decimal_places(const char *number) 445 { 446 int places = 0; 447 char *dp; 448 449 /* look for a decimal point */ 450 if ((dp = strstr(number, decimal_point))) { 451 dp += strlen(decimal_point); 452 453 while (isdigit((unsigned char)*dp++)) 454 places++; 455 } 456 return (places); 457 } 458 459 /* 460 * generate_format - create a format string 461 * 462 * XXX to be bug for bug compatible with Plan9 and GNU return "%g" 463 * when "%g" prints as "%e" (this way no width adjustments are made) 464 */ 465 static char * 466 generate_format(double first, double incr, double last, int equalize, char pad) 467 { 468 static char buf[256]; 469 char cc = '\0'; 470 int precision, width1, width2, places; 471 472 if (equalize == 0) 473 return (default_format); 474 475 /* figure out "last" value printed */ 476 if (first > last) 477 last = first - incr * floor((first - last) / incr); 478 else 479 last = first + incr * floor((last - first) / incr); 480 481 sprintf(buf, "%g", incr); 482 if (strchr(buf, 'e')) 483 cc = 'e'; 484 precision = decimal_places(buf); 485 486 width1 = sprintf(buf, "%g", first); 487 if (strchr(buf, 'e')) 488 cc = 'e'; 489 if ((places = decimal_places(buf))) 490 width1 -= (places + strlen(decimal_point)); 491 492 precision = MAX(places, precision); 493 494 width2 = sprintf(buf, "%g", last); 495 if (strchr(buf, 'e')) 496 cc = 'e'; 497 if ((places = decimal_places(buf))) 498 width2 -= (places + strlen(decimal_point)); 499 500 if (precision) { 501 sprintf(buf, "%%%c%d.%d%c", pad, 502 MAX(width1, width2) + (int) strlen(decimal_point) + 503 precision, precision, (cc) ? cc : 'f'); 504 } else { 505 sprintf(buf, "%%%c%d%c", pad, MAX(width1, width2), 506 (cc) ? cc : 'g'); 507 } 508 509 return (buf); 510 } 511