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1.3 ! rob 1: /* $OpenBSD: seq.c,v 1.2 2022/02/22 16:08:59 rob Exp $ */
1.1 millert 2:
3: /*-
4: * Copyright (c) 2005 The NetBSD Foundation, Inc.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to The NetBSD Foundation
8: * by Brian Ginsbach.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29: * POSSIBILITY OF SUCH DAMAGE.
30: */
31:
32: #include <ctype.h>
33: #include <err.h>
34: #include <errno.h>
35: #include <getopt.h>
36: #include <math.h>
37: #include <locale.h>
38: #include <stdio.h>
39: #include <stdlib.h>
40: #include <string.h>
41: #include <unistd.h>
42:
43: #define VERSION "1.0"
44: #define ZERO '0'
45: #define SPACE ' '
46:
47: #define MAXIMUM(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')
51:
52: /* Globals */
53:
54: static const char *decimal_point = "."; /* default */
55: static char default_format[] = { "%g" }; /* default */
56:
57: static const struct option long_opts[] =
58: {
59: {"format", required_argument, NULL, 'f'},
60: {"help", no_argument, NULL, 'h'},
61: {"separator", required_argument, NULL, 's'},
62: {"version", no_argument, NULL, 'v'},
63: {"equal-width", no_argument, NULL, 'w'},
64: {NULL, no_argument, NULL, 0}
65: };
66:
67: /* Prototypes */
68:
69: static double e_atof(const char *);
70:
71: static int decimal_places(const char *);
72: static int numeric(const char *);
73: static int valid_format(const char *);
74:
75: static char *generate_format(double, double, double, int, char);
76:
77: static __dead void usage(int error);
78:
79: /*
80: * The seq command will print out a numeric sequence from 1, the default,
81: * to a user specified upper limit by 1. The lower bound and increment
82: * maybe indicated by the user on the command line. The sequence can
83: * be either whole, the default, or decimal numbers.
84: */
85: int
86: main(int argc, char *argv[])
87: {
88: int c = 0;
89: int equalize = 0;
90: double first = 1.0;
91: double last = 0.0;
92: double incr = 0.0;
93: double last_shown_value = 0.0;
94: double cur, step;
95: struct lconv *locale;
96: char *fmt = NULL;
97: const char *sep = "\n";
98: const char *term = "\n";
99: char *cur_print, *last_print;
100: char pad = ZERO;
1.3 ! rob 101:
! 102: if (pledge("stdio", NULL) == -1)
! 103: err(1, "pledge");
1.1 millert 104:
105: /* Determine the locale's decimal point. */
106: locale = localeconv();
107: if (locale && locale->decimal_point && locale->decimal_point[0] != '\0')
108: decimal_point = locale->decimal_point;
109:
110: /*
111: * Process options, but handle negative numbers separately
112: * least they trip up getopt(3).
113: */
114: while ((optind < argc) && !numeric(argv[optind]) &&
115: (c = getopt_long(argc, argv, "+f:s:w", long_opts, NULL)) != -1) {
116:
117: switch (c) {
118: case 'f': /* format (plan9/GNU) */
119: fmt = optarg;
120: equalize = 0;
121: break;
122: case 's': /* separator (GNU) */
123: sep = optarg;
124: break;
125: case 'v': /* version (GNU) */
126: printf("seq version %s\n", VERSION);
127: return 0;
128: case 'w': /* equal width (plan9/GNU) */
129: if (fmt == NULL) {
130: if (equalize++)
131: pad = SPACE;
132: }
133: break;
134: case 'h': /* help (GNU) */
135: usage(0);
136: break;
137: default:
138: usage(1);
139: break;
140: }
141: }
142:
143: argc -= optind;
144: argv += optind;
145: if (argc < 1 || argc > 3)
146: usage(1);
147:
148: last = e_atof(argv[argc - 1]);
149:
150: if (argc > 1)
151: first = e_atof(argv[0]);
152:
153: if (argc > 2) {
154: incr = e_atof(argv[1]);
155: /* Plan 9/GNU don't do zero */
156: if (incr == 0.0)
157: errx(1, "zero %screment", (first < last)? "in" : "de");
158: }
159:
160: /* default is one for Plan 9/GNU work alike */
161: if (incr == 0.0)
162: incr = (first < last) ? 1.0 : -1.0;
163:
164: if (incr <= 0.0 && first < last)
165: errx(1, "needs positive increment");
166:
167: if (incr >= 0.0 && first > last)
168: errx(1, "needs negative decrement");
169:
170: if (fmt != NULL) {
171: if (!valid_format(fmt))
172: errx(1, "invalid format string: `%s'", fmt);
173: /*
174: * XXX to be bug for bug compatible with Plan 9 add a
175: * newline if none found at the end of the format string.
176: */
177: } else
178: fmt = generate_format(first, incr, last, equalize, pad);
179:
180: for (step = 1, cur = first; incr > 0 ? cur <= last : cur >= last;
181: cur = first + incr * step++) {
182: if (cur != first)
183: fputs(sep, stdout);
184: printf(fmt, cur);
185: last_shown_value = cur;
186: }
187:
188: /*
189: * Did we miss the last value of the range in the loop above?
190: *
191: * We might have, so check if the printable version of the last
192: * computed value ('cur') and desired 'last' value are equal. If they
193: * are equal after formatting truncation, but 'cur' and
194: * 'last_shown_value' are not equal, it means the exit condition of the
195: * loop held true due to a rounding error and we still need to print
196: * 'last'.
197: */
198: asprintf(&cur_print, fmt, cur);
199: asprintf(&last_print, fmt, last);
200: if (strcmp(cur_print, last_print) == 0 && cur != last_shown_value) {
201: if (cur != first)
202: fputs(sep, stdout);
203: fputs(last_print, stdout);
204: }
205: free(cur_print);
206: free(last_print);
207:
208: fputs(term, stdout);
209:
210: return 0;
211: }
212:
213: /*
214: * numeric - verify that string is numeric
215: */
216: static int
217: numeric(const char *s)
218: {
219: int seen_decimal_pt, decimal_pt_len;
220:
221: /* skip any sign */
222: if (ISSIGN((unsigned char)*s))
223: s++;
224:
225: seen_decimal_pt = 0;
226: decimal_pt_len = strlen(decimal_point);
227: while (*s) {
228: if (!isdigit((unsigned char)*s)) {
229: if (!seen_decimal_pt &&
230: strncmp(s, decimal_point, decimal_pt_len) == 0) {
231: s += decimal_pt_len;
232: seen_decimal_pt = 1;
233: continue;
234: }
235: if (ISEXP((unsigned char)*s)) {
236: s++;
237: if (ISSIGN((unsigned char)*s) ||
238: isdigit((unsigned char)*s)) {
239: s++;
240: continue;
241: }
242: }
243: break;
244: }
245: s++;
246: }
247: return *s == '\0';
248: }
249:
250: /*
251: * valid_format - validate user specified format string
252: */
253: static int
254: valid_format(const char *fmt)
255: {
256: unsigned conversions = 0;
257:
258: while (*fmt != '\0') {
259: /* scan for conversions */
260: if (*fmt != '%') {
261: fmt++;
262: continue;
263: }
264: fmt++;
265:
266: /* allow %% but not things like %10% */
267: if (*fmt == '%') {
268: fmt++;
269: continue;
270: }
271:
272: /* flags */
273: while (*fmt != '\0' && strchr("#0- +'", *fmt)) {
274: fmt++;
275: }
276:
277: /* field width */
278: while (*fmt != '\0' && strchr("0123456789", *fmt)) {
279: fmt++;
280: }
281:
282: /* precision */
283: if (*fmt == '.') {
284: fmt++;
285: while (*fmt != '\0' && strchr("0123456789", *fmt)) {
286: fmt++;
287: }
288: }
289:
290: /* conversion */
291: switch (*fmt) {
292: case 'A':
293: case 'a':
294: case 'E':
295: case 'e':
296: case 'F':
297: case 'f':
298: case 'G':
299: case 'g':
300: /* floating point formats are accepted */
301: conversions++;
302: break;
303: default:
304: /* anything else is not */
305: return 0;
306: }
307: }
308:
309: /* PR 236347 -- user format strings must have a conversion */
310: return conversions == 1;
311: }
312:
313: /*
314: * e_atof - convert an ASCII string to a double
315: * exit if string is not a valid double, or if converted value would
316: * cause overflow or underflow
317: */
318: static double
319: e_atof(const char *num)
320: {
321: char *endp;
322: double dbl;
323:
324: errno = 0;
325: dbl = strtod(num, &endp);
326:
327: if (errno == ERANGE)
328: /* under or overflow */
329: err(2, "%s", num);
330: else if (*endp != '\0')
331: /* "junk" left in number */
332: errx(2, "invalid floating point argument: %s", num);
333:
334: /* zero shall have no sign */
335: if (dbl == -0.0)
336: dbl = 0;
337: return dbl;
338: }
339:
340: /*
341: * decimal_places - count decimal places in a number (string)
342: */
343: static int
344: decimal_places(const char *number)
345: {
346: int places = 0;
347: char *dp;
348:
349: /* look for a decimal point */
350: if ((dp = strstr(number, decimal_point))) {
351: dp += strlen(decimal_point);
352:
353: while (isdigit((unsigned char)*dp++))
354: places++;
355: }
356: return places;
357: }
358:
359: /*
360: * generate_format - create a format string
361: *
362: * XXX to be bug for bug compatible with Plan9 and GNU return "%g"
363: * when "%g" prints as "%e" (this way no width adjustments are made)
364: */
365: static char *
366: generate_format(double first, double incr, double last, int equalize, char pad)
367: {
368: static char buf[256];
369: char cc = '\0';
370: int precision, width1, width2, places;
371:
372: if (equalize == 0)
373: return default_format;
374:
375: /* figure out "last" value printed */
376: if (first > last)
377: last = first - incr * floor((first - last) / incr);
378: else
379: last = first + incr * floor((last - first) / incr);
380:
381: snprintf(buf, sizeof(buf), "%g", incr);
382: if (strchr(buf, 'e'))
383: cc = 'e';
384: precision = decimal_places(buf);
385:
386: width1 = snprintf(buf, sizeof(buf), "%g", first);
387: if (strchr(buf, 'e'))
388: cc = 'e';
389: if ((places = decimal_places(buf)))
390: width1 -= (places + strlen(decimal_point));
391:
392: precision = MAXIMUM(places, precision);
393:
394: width2 = snprintf(buf, sizeof(buf), "%g", last);
395: if (strchr(buf, 'e'))
396: cc = 'e';
397: if ((places = decimal_places(buf)))
398: width2 -= (places + strlen(decimal_point));
399:
400: /* XXX if incr is floating point fix the precision */
401: if (precision) {
402: snprintf(buf, sizeof(buf), "%%%c%d.%d%c", pad,
403: MAXIMUM(width1, width2) + (int) strlen(decimal_point) +
404: precision, precision, (cc) ? cc : 'f');
405: } else {
406: snprintf(buf, sizeof(buf), "%%%c%d%c", pad,
407: MAXIMUM(width1, width2), (cc) ? cc : 'g');
408: }
409:
410: return buf;
411: }
412:
413: static __dead void
414: usage(int error)
415: {
416: fprintf(stderr,
1.2 rob 417: "usage: %s [-w] [-f format] [-s string] [first [incr]] last\n",
1.1 millert 418: getprogname());
419: exit(error);
420: }