1 /*
2 * Copyright (c) 2005 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Brian Ginsbach.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 #ifndef lint
32 __COPYRIGHT("@(#) Copyright (c) 2005\
33 The NetBSD Foundation, Inc. All rights reserved.");
34 __RCSID("$NetBSD: seq.c,v 1.12 2021/03/20 22:10:17 cheusov Exp $");
35 #endif /* not lint */
36
37 #include <ctype.h>
38 #include <err.h>
39 #include <errno.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 const char *decimal_point = "."; /* default */
58 char default_format[] = { "%g" }; /* default */
59
60 /* Prototypes */
61
62 double e_atof(const char *);
63
64 int decimal_places(const char *);
65 int numeric(const char *);
66 int valid_format(const char *);
67
68 char *generate_format(double, double, double, int, char);
69 char *unescape(char *);
70
71 /*
72 * The seq command will print out a numeric sequence from 1, the default,
73 * to a user specified upper limit by 1. The lower bound and increment
74 * maybe indicated by the user on the command line. The sequence can
75 * be either whole, the default, or decimal numbers.
76 */
77 int
main(int argc,char * argv[])78 main(int argc, char *argv[])
79 {
80 int c = 0, errflg = 0;
81 int equalize = 0;
82 double first = 1.0;
83 double last = 0.0;
84 double incr = 0.0;
85 struct lconv *locale;
86 char *fmt = NULL;
87 const char *sep = "\n";
88 const char *term = "\n";
89 char pad = ZERO;
90
91 /* Determine the locale's decimal point. */
92 locale = localeconv();
93 if (locale && locale->decimal_point && locale->decimal_point[0] != '\0')
94 decimal_point = locale->decimal_point;
95
96 /*
97 * Process options, but handle negative numbers separately
98 * least they trip up getopt(3).
99 */
100 while ((optind < argc) && !numeric(argv[optind]) &&
101 (c = getopt(argc, argv, "f:hs:t:w")) != -1) {
102
103 switch (c) {
104 case 'f': /* format (plan9) */
105 fmt = optarg;
106 equalize = 0;
107 break;
108 case 's': /* separator (GNU) */
109 sep = unescape(optarg);
110 break;
111 case 't': /* terminator (new) */
112 term = unescape(optarg);
113 break;
114 case 'w': /* equal width (plan9) */
115 if (!fmt)
116 if (equalize++)
117 pad = SPACE;
118 break;
119 case 'h': /* help (GNU) */
120 default:
121 errflg++;
122 break;
123 }
124 }
125
126 argc -= optind;
127 argv += optind;
128 if (argc < 1 || argc > 3)
129 errflg++;
130
131 if (errflg) {
132 fprintf(stderr,
133 "usage: %s [-w] [-f format] [-s string] [-t string] [first [incr]] last\n",
134 getprogname());
135 exit(1);
136 }
137
138 last = e_atof(argv[argc - 1]);
139
140 if (argc > 1)
141 first = e_atof(argv[0]);
142
143 if (argc > 2) {
144 incr = e_atof(argv[1]);
145 /* Plan 9/GNU don't do zero */
146 if (incr == 0.0)
147 errx(1, "zero %screment", (first < last)? "in" : "de");
148 }
149
150 /* default is one for Plan 9/GNU work alike */
151 if (incr == 0.0)
152 incr = (first < last) ? 1.0 : -1.0;
153
154 if (incr <= 0.0 && first < last)
155 errx(1, "needs positive increment");
156
157 if (incr >= 0.0 && first > last)
158 errx(1, "needs negative decrement");
159
160 if (fmt != NULL) {
161 if (!valid_format(fmt))
162 errx(1, "invalid format string: `%s'", fmt);
163 fmt = unescape(fmt);
164 if (!valid_format(fmt))
165 errx(1, "invalid format string");
166 /*
167 * XXX to be bug for bug compatible with Plan 9 add a
168 * newline if none found at the end of the format string.
169 */
170 } else
171 fmt = generate_format(first, incr, last, equalize, pad);
172
173 if (incr > 0) {
174 printf(fmt, first);
175 for (first += incr; first <= last; first += incr) {
176 fputs(sep, stdout);
177 printf(fmt, first);
178 }
179 } else {
180 printf(fmt, first);
181 for (first += incr; first >= last; first += incr) {
182 fputs(sep, stdout);
183 printf(fmt, first);
184 }
185 }
186 if (term != NULL)
187 fputs(term, stdout);
188
189 return (0);
190 }
191
192 /*
193 * numeric - verify that string is numeric
194 */
195 int
numeric(const char * s)196 numeric(const char *s)
197 {
198 int seen_decimal_pt, decimal_pt_len;
199
200 /* skip any sign */
201 if (ISSIGN((unsigned char)*s))
202 s++;
203
204 seen_decimal_pt = 0;
205 decimal_pt_len = strlen(decimal_point);
206 while (*s) {
207 if (!isdigit((unsigned char)*s)) {
208 if (!seen_decimal_pt &&
209 strncmp(s, decimal_point, decimal_pt_len) == 0) {
210 s += decimal_pt_len;
211 seen_decimal_pt = 1;
212 continue;
213 }
214 if (ISEXP((unsigned char)*s)) {
215 s++;
216 /* optional sign */
217 if (ISSIGN((unsigned char)*s))
218 s++;
219 continue;
220 }
221 break;
222 }
223 s++;
224 }
225 return (*s == '\0');
226 }
227
228 /*
229 * valid_format - validate user specified format string
230 */
231 int
valid_format(const char * fmt)232 valid_format(const char *fmt)
233 {
234 unsigned conversions = 0;
235
236 while (*fmt != '\0') {
237 /* scan for conversions */
238 if (*fmt != '%') {
239 fmt++;
240 continue;
241 }
242 fmt++;
243
244 /* allow %% but not things like %10% */
245 if (*fmt == '%') {
246 fmt++;
247 continue;
248 }
249
250 /* flags */
251 while (*fmt != '\0' && strchr("#0- +'", *fmt)) {
252 fmt++;
253 }
254
255 /* field width */
256 while (*fmt != '\0' && strchr("0123456789", *fmt)) {
257 fmt++;
258 }
259
260 /* precision */
261 if (*fmt == '.') {
262 fmt++;
263 while (*fmt != '\0' && strchr("0123456789", *fmt)) {
264 fmt++;
265 }
266 }
267
268 /* conversion */
269 switch (*fmt) {
270 case 'A':
271 case 'a':
272 case 'E':
273 case 'e':
274 case 'F':
275 case 'f':
276 case 'G':
277 case 'g':
278 /* floating point formats are accepted */
279 conversions++;
280 break;
281 default:
282 /* anything else is not */
283 return 0;
284 }
285 }
286
287 return (conversions <= 1);
288 }
289
290 /*
291 * unescape - handle C escapes in a string
292 */
293 char *
unescape(char * orig)294 unescape(char *orig)
295 {
296 char c, *cp, *new = orig;
297 int i;
298
299 for (cp = orig; (*orig = *cp); cp++, orig++) {
300 if (*cp != '\\')
301 continue;
302
303 switch (*++cp) {
304 case 'a': /* alert (bell) */
305 *orig = '\a';
306 continue;
307 case 'b': /* backspace */
308 *orig = '\b';
309 continue;
310 case 'e': /* escape */
311 *orig = '\x1B';
312 continue;
313 case 'f': /* formfeed */
314 *orig = '\f';
315 continue;
316 case 'n': /* newline */
317 *orig = '\n';
318 continue;
319 case 'r': /* carriage return */
320 *orig = '\r';
321 continue;
322 case 't': /* horizontal tab */
323 *orig = '\t';
324 continue;
325 case 'v': /* vertical tab */
326 *orig = '\v';
327 continue;
328 case '\\': /* backslash */
329 *orig = '\\';
330 continue;
331 case '\'': /* single quote */
332 *orig = '\'';
333 continue;
334 case '\"': /* double quote */
335 *orig = '"';
336 continue;
337 case '0':
338 case '1':
339 case '2':
340 case '3': /* octal */
341 case '4':
342 case '5':
343 case '6':
344 case '7': /* number */
345 for (i = 0, c = 0;
346 ISODIGIT((unsigned char)*cp) && i < 3;
347 i++, cp++) {
348 c <<= 3;
349 c |= (*cp - '0');
350 }
351 *orig = c;
352 --cp;
353 continue;
354 case 'x': /* hexadecimal number */
355 cp++; /* skip 'x' */
356 for (i = 0, c = 0;
357 isxdigit((unsigned char)*cp) && i < 2;
358 i++, cp++) {
359 c <<= 4;
360 if (isdigit((unsigned char)*cp))
361 c |= (*cp - '0');
362 else
363 c |= ((toupper((unsigned char)*cp) -
364 'A') + 10);
365 }
366 *orig = c;
367 --cp;
368 continue;
369 default:
370 --cp;
371 break;
372 }
373 }
374
375 return (new);
376 }
377
378 /*
379 * e_atof - convert an ASCII string to a double
380 * exit if string is not a valid double, or if converted value would
381 * cause overflow or underflow
382 */
383 double
e_atof(const char * num)384 e_atof(const char *num)
385 {
386 char *endp;
387 double dbl;
388
389 errno = 0;
390 dbl = strtod(num, &endp);
391
392 if (errno == ERANGE)
393 /* under or overflow */
394 err(2, "%s", num);
395 else if (*endp != '\0')
396 /* "junk" left in number */
397 errx(2, "invalid floating point argument: %s", num);
398
399 /* zero shall have no sign */
400 if (dbl == -0.0)
401 dbl = 0;
402 return (dbl);
403 }
404
405 /*
406 * decimal_places - count decimal places in a number (string)
407 */
408 int
decimal_places(const char * number)409 decimal_places(const char *number)
410 {
411 int places = 0;
412 char *dp;
413
414 /* look for a decimal point */
415 if ((dp = strstr(number, decimal_point))) {
416 dp += strlen(decimal_point);
417
418 while (isdigit((unsigned char)*dp++))
419 places++;
420 }
421 return (places);
422 }
423
424 /*
425 * generate_format - create a format string
426 *
427 * XXX to be bug for bug compatible with Plan9 and GNU return "%g"
428 * when "%g" prints as "%e" (this way no width adjustments are made)
429 */
430 char *
generate_format(double first,double incr,double last,int equalize,char pad)431 generate_format(double first, double incr, double last, int equalize, char pad)
432 {
433 static char buf[256];
434 char cc = '\0';
435 int precision, width1, width2, places;
436
437 if (equalize == 0)
438 return (default_format);
439
440 /* figure out "last" value printed */
441 if (first > last)
442 last = first - incr * floor((first - last) / incr);
443 else
444 last = first + incr * floor((last - first) / incr);
445
446 sprintf(buf, "%g", incr);
447 if (strchr(buf, 'e'))
448 cc = 'e';
449 precision = decimal_places(buf);
450
451 width1 = sprintf(buf, "%g", first);
452 if (strchr(buf, 'e'))
453 cc = 'e';
454 if ((places = decimal_places(buf)))
455 width1 -= (places + strlen(decimal_point));
456
457 precision = MAX(places, precision);
458
459 width2 = sprintf(buf, "%g", last);
460 if (strchr(buf, 'e'))
461 cc = 'e';
462 if ((places = decimal_places(buf)))
463 width2 -= (places + strlen(decimal_point));
464
465 if (precision) {
466 sprintf(buf, "%%%c%d.%d%c", pad,
467 MAX(width1, width2) + (int) strlen(decimal_point) +
468 precision, precision, (cc) ? cc : 'f');
469 } else {
470 sprintf(buf, "%%%c%d%c", pad, MAX(width1, width2),
471 (cc) ? cc : 'g');
472 }
473
474 return (buf);
475 }
476