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