1 /* $NetBSD: seq.c,v 1.7 2010/05/27 08:40:19 dholland Exp $ */
3 * Copyright (c) 2005 The NetBSD Foundation, Inc.
6 * This code is derived from software contributed to The NetBSD Foundation
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
47 #define MAX(a, b) (((a) < (b))? (b) : (a))
48 #define ISSIGN(c) ((int)(c) == '-' || (int)(c) == '+')
49 #define ISEXP(c) ((int)(c) == 'e' || (int)(c) == 'E')
50 #define ISODIGIT(c) ((int)(c) >= '0' && (int)(c) <= '7')
54 static const char *decimal_point = "."; /* default */
55 static char default_format[] = { "%g" }; /* default */
59 static double e_atof(const char *);
61 static int decimal_places(const char *);
62 static int numeric(const char *);
63 static int valid_format(const char *);
65 static char *generate_format(double, double, double, int, char);
66 static char *unescape(char *);
69 * The seq command will print out a numeric sequence from 1, the default,
70 * to a user specified upper limit by 1. The lower bound and increment
71 * maybe indicated by the user on the command line. The sequence can
72 * be either whole, the default, or decimal numbers.
75 main(int argc, char *argv[])
77 int c = 0, errflg = 0;
84 const char *sep = "\n";
85 const char *term = NULL;
88 /* Determine the locale's decimal point. */
89 locale = localeconv();
90 if (locale && locale->decimal_point && locale->decimal_point[0] != '\0')
91 decimal_point = locale->decimal_point;
94 * Process options, but handle negative numbers separately
95 * least they trip up getopt(3).
97 while ((optind < argc) && !numeric(argv[optind]) &&
98 (c = getopt(argc, argv, "f:hs:t:w")) != -1) {
101 case 'f': /* format (plan9) */
105 case 's': /* separator (GNU) */
106 sep = unescape(optarg);
108 case 't': /* terminator (new) */
109 term = unescape(optarg);
111 case 'w': /* equal width (plan9) */
116 case 'h': /* help (GNU) */
125 if (argc < 1 || argc > 3)
130 "usage: %s [-w] [-f format] [-s string] [-t string] [first [incr]] last\n",
135 last = e_atof(argv[argc - 1]);
138 first = e_atof(argv[0]);
141 incr = e_atof(argv[1]);
142 /* Plan 9/GNU don't do zero */
144 errx(1, "zero %screment", (first < last)? "in" : "de");
147 /* default is one for Plan 9/GNU work alike */
149 incr = (first < last) ? 1.0 : -1.0;
151 if (incr <= 0.0 && first < last)
152 errx(1, "needs positive increment");
154 if (incr >= 0.0 && first > last)
155 errx(1, "needs negative decrement");
158 if (!valid_format(fmt))
159 errx(1, "invalid format string: `%s'", fmt);
161 if (!valid_format(fmt))
162 errx(1, "invalid format string");
164 * XXX to be bug for bug compatible with Plan 9 add a
165 * newline if none found at the end of the format string.
168 fmt = generate_format(first, incr, last, equalize, pad);
171 for (; first <= last; first += incr) {
176 for (; first >= last; first += incr) {
188 * numeric - verify that string is numeric
191 numeric(const char *s)
193 int seen_decimal_pt, decimal_pt_len;
196 if (ISSIGN((unsigned char)*s))
200 decimal_pt_len = strlen(decimal_point);
202 if (!isdigit((unsigned char)*s)) {
203 if (!seen_decimal_pt &&
204 strncmp(s, decimal_point, decimal_pt_len) == 0) {
209 if (ISEXP((unsigned char)*s)) {
211 if (ISSIGN((unsigned char)*s) ||
212 isdigit((unsigned char)*s)) {
225 * valid_format - validate user specified format string
228 valid_format(const char *fmt)
230 unsigned conversions = 0;
232 while (*fmt != '\0') {
233 /* scan for conversions */
240 /* allow %% but not things like %10% */
247 while (*fmt != '\0' && strchr("#0- +'", *fmt)) {
252 while (*fmt != '\0' && strchr("0123456789", *fmt)) {
259 while (*fmt != '\0' && strchr("0123456789", *fmt)) {
274 /* floating point formats are accepted */
278 /* anything else is not */
283 return (conversions <= 1);
287 * unescape - handle C escapes in a string
292 char c, *cp, *new = orig;
295 for (cp = orig; (*orig = *cp); cp++, orig++) {
300 case 'a': /* alert (bell) */
303 case 'b': /* backspace */
306 case 'e': /* escape */
309 case 'f': /* formfeed */
312 case 'n': /* newline */
315 case 'r': /* carriage return */
318 case 't': /* horizontal tab */
321 case 'v': /* vertical tab */
324 case '\\': /* backslash */
327 case '\'': /* single quote */
330 case '\"': /* double quote */
336 case '3': /* octal */
340 case '7': /* number */
342 ISODIGIT((unsigned char)*cp) && i < 3;
350 case 'x': /* hexadecimal number */
353 isxdigit((unsigned char)*cp) && i < 2;
356 if (isdigit((unsigned char)*cp))
359 c |= ((toupper((unsigned char)*cp) -
375 * e_atof - convert an ASCII string to a double
376 * exit if string is not a valid double, or if converted value would
377 * cause overflow or underflow
380 e_atof(const char *num)
386 dbl = strtod(num, &endp);
389 /* under or overflow */
391 else if (*endp != '\0')
392 /* "junk" left in number */
393 errx(2, "invalid floating point argument: %s", num);
395 /* zero shall have no sign */
402 * decimal_places - count decimal places in a number (string)
405 decimal_places(const char *number)
410 /* look for a decimal point */
411 if ((dp = strstr(number, decimal_point))) {
412 dp += strlen(decimal_point);
414 while (isdigit((unsigned char)*dp++))
421 * generate_format - create a format string
423 * XXX to be bug for bug compatible with Plan9 and GNU return "%g"
424 * when "%g" prints as "%e" (this way no width adjustments are made)
427 generate_format(double first, double incr, double last, int equalize, char pad)
429 static char buf[256];
431 int precision, width1, width2, places;
434 return (default_format);
436 /* figure out "last" value printed */
438 last = first - incr * floor((first - last) / incr);
440 last = first + incr * floor((last - first) / incr);
442 sprintf(buf, "%g", incr);
443 if (strchr(buf, 'e'))
445 precision = decimal_places(buf);
447 width1 = sprintf(buf, "%g", first);
448 if (strchr(buf, 'e'))
450 if ((places = decimal_places(buf)))
451 width1 -= (places + strlen(decimal_point));
453 precision = MAX(places, precision);
455 width2 = sprintf(buf, "%g", last);
456 if (strchr(buf, 'e'))
458 if ((places = decimal_places(buf)))
459 width2 -= (places + strlen(decimal_point));
462 sprintf(buf, "%%%c%d.%d%c", pad,
463 MAX(width1, width2) + (int) strlen(decimal_point) +
464 precision, precision, (cc) ? cc : 'f');
466 sprintf(buf, "%%%c%d%c", pad, MAX(width1, width2),