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
main(int argc,char * argv[])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
numeric(const char * s)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
valid_format(const char * fmt)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 *
unescape(char * orig)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
e_atof(const char * num)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
decimal_places(const char * number)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 *
generate_format(double first,double incr,double last,int equalize,char pad)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