![[BACK]](/icons/back.gif){kind=icon}
Return to seq.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / seq|
Return to seq.c CVS log | Up to [local] / src / usr.bin / seq |
1.2 ! rob 1: /* $OpenBSD: seq.c,v 1.1 2022/02/22 15:15:34 millert 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;
101:
102: /* Determine the locale's decimal point. */
103: locale = localeconv();
104: if (locale && locale->decimal_point && locale->decimal_point[0] != '\0')
105: decimal_point = locale->decimal_point;
106:
107: /*
108: * Process options, but handle negative numbers separately
109: * least they trip up getopt(3).
110: */
111: while ((optind < argc) && !numeric(argv[optind]) &&
112: (c = getopt_long(argc, argv, "+f:s:w", long_opts, NULL)) != -1) {
113:
114: switch (c) {
115: case 'f': /* format (plan9/GNU) */
116: fmt = optarg;
117: equalize = 0;
118: break;
119: case 's': /* separator (GNU) */
120: sep = optarg;
121: break;
122: case 'v': /* version (GNU) */
123: printf("seq version %s\n", VERSION);
124: return 0;
125: case 'w': /* equal width (plan9/GNU) */
126: if (fmt == NULL) {
127: if (equalize++)
128: pad = SPACE;
129: }
130: break;
131: case 'h': /* help (GNU) */
132: usage(0);
133: break;
134: default:
135: usage(1);
136: break;
137: }
138: }
139:
140: argc -= optind;
141: argv += optind;
142: if (argc < 1 || argc > 3)
143: usage(1);
144:
145: last = e_atof(argv[argc - 1]);
146:
147: if (argc > 1)
148: first = e_atof(argv[0]);
149:
150: if (argc > 2) {
151: incr = e_atof(argv[1]);
152: /* Plan 9/GNU don't do zero */
153: if (incr == 0.0)
154: errx(1, "zero %screment", (first < last)? "in" : "de");
155: }
156:
157: /* default is one for Plan 9/GNU work alike */
158: if (incr == 0.0)
159: incr = (first < last) ? 1.0 : -1.0;
160:
161: if (incr <= 0.0 && first < last)
162: errx(1, "needs positive increment");
163:
164: if (incr >= 0.0 && first > last)
165: errx(1, "needs negative decrement");
166:
167: if (fmt != NULL) {
168: if (!valid_format(fmt))
169: errx(1, "invalid format string: `%s'", fmt);
170: /*
171: * XXX to be bug for bug compatible with Plan 9 add a
172: * newline if none found at the end of the format string.
173: */
174: } else
175: fmt = generate_format(first, incr, last, equalize, pad);
176:
177: for (step = 1, cur = first; incr > 0 ? cur <= last : cur >= last;
178: cur = first + incr * step++) {
179: if (cur != first)
180: fputs(sep, stdout);
181: printf(fmt, cur);
182: last_shown_value = cur;
183: }
184:
185: /*
186: * Did we miss the last value of the range in the loop above?
187: *
188: * We might have, so check if the printable version of the last
189: * computed value ('cur') and desired 'last' value are equal. If they
190: * are equal after formatting truncation, but 'cur' and
191: * 'last_shown_value' are not equal, it means the exit condition of the
192: * loop held true due to a rounding error and we still need to print
193: * 'last'.
194: */
195: asprintf(&cur_print, fmt, cur);
196: asprintf(&last_print, fmt, last);
197: if (strcmp(cur_print, last_print) == 0 && cur != last_shown_value) {
198: if (cur != first)
199: fputs(sep, stdout);
200: fputs(last_print, stdout);
201: }
202: free(cur_print);
203: free(last_print);
204:
205: fputs(term, stdout);
206:
207: return 0;
208: }
209:
210: /*
211: * numeric - verify that string is numeric
212: */
213: static int
214: numeric(const char *s)
215: {
216: int seen_decimal_pt, decimal_pt_len;
217:
218: /* skip any sign */
219: if (ISSIGN((unsigned char)*s))
220: s++;
221:
222: seen_decimal_pt = 0;
223: decimal_pt_len = strlen(decimal_point);
224: while (*s) {
225: if (!isdigit((unsigned char)*s)) {
226: if (!seen_decimal_pt &&
227: strncmp(s, decimal_point, decimal_pt_len) == 0) {
228: s += decimal_pt_len;
229: seen_decimal_pt = 1;
230: continue;
231: }
232: if (ISEXP((unsigned char)*s)) {
233: s++;
234: if (ISSIGN((unsigned char)*s) ||
235: isdigit((unsigned char)*s)) {
236: s++;
237: continue;
238: }
239: }
240: break;
241: }
242: s++;
243: }
244: return *s == '\0';
245: }
246:
247: /*
248: * valid_format - validate user specified format string
249: */
250: static int
251: valid_format(const char *fmt)
252: {
253: unsigned conversions = 0;
254:
255: while (*fmt != '\0') {
256: /* scan for conversions */
257: if (*fmt != '%') {
258: fmt++;
259: continue;
260: }
261: fmt++;
262:
263: /* allow %% but not things like %10% */
264: if (*fmt == '%') {
265: fmt++;
266: continue;
267: }
268:
269: /* flags */
270: while (*fmt != '\0' && strchr("#0- +'", *fmt)) {
271: fmt++;
272: }
273:
274: /* field width */
275: while (*fmt != '\0' && strchr("0123456789", *fmt)) {
276: fmt++;
277: }
278:
279: /* precision */
280: if (*fmt == '.') {
281: fmt++;
282: while (*fmt != '\0' && strchr("0123456789", *fmt)) {
283: fmt++;
284: }
285: }
286:
287: /* conversion */
288: switch (*fmt) {
289: case 'A':
290: case 'a':
291: case 'E':
292: case 'e':
293: case 'F':
294: case 'f':
295: case 'G':
296: case 'g':
297: /* floating point formats are accepted */
298: conversions++;
299: break;
300: default:
301: /* anything else is not */
302: return 0;
303: }
304: }
305:
306: /* PR 236347 -- user format strings must have a conversion */
307: return conversions == 1;
308: }
309:
310: /*
311: * e_atof - convert an ASCII string to a double
312: * exit if string is not a valid double, or if converted value would
313: * cause overflow or underflow
314: */
315: static double
316: e_atof(const char *num)
317: {
318: char *endp;
319: double dbl;
320:
321: errno = 0;
322: dbl = strtod(num, &endp);
323:
324: if (errno == ERANGE)
325: /* under or overflow */
326: err(2, "%s", num);
327: else if (*endp != '\0')
328: /* "junk" left in number */
329: errx(2, "invalid floating point argument: %s", num);
330:
331: /* zero shall have no sign */
332: if (dbl == -0.0)
333: dbl = 0;
334: return dbl;
335: }
336:
337: /*
338: * decimal_places - count decimal places in a number (string)
339: */
340: static int
341: decimal_places(const char *number)
342: {
343: int places = 0;
344: char *dp;
345:
346: /* look for a decimal point */
347: if ((dp = strstr(number, decimal_point))) {
348: dp += strlen(decimal_point);
349:
350: while (isdigit((unsigned char)*dp++))
351: places++;
352: }
353: return places;
354: }
355:
356: /*
357: * generate_format - create a format string
358: *
359: * XXX to be bug for bug compatible with Plan9 and GNU return "%g"
360: * when "%g" prints as "%e" (this way no width adjustments are made)
361: */
362: static char *
363: generate_format(double first, double incr, double last, int equalize, char pad)
364: {
365: static char buf[256];
366: char cc = '\0';
367: int precision, width1, width2, places;
368:
369: if (equalize == 0)
370: return default_format;
371:
372: /* figure out "last" value printed */
373: if (first > last)
374: last = first - incr * floor((first - last) / incr);
375: else
376: last = first + incr * floor((last - first) / incr);
377:
378: snprintf(buf, sizeof(buf), "%g", incr);
379: if (strchr(buf, 'e'))
380: cc = 'e';
381: precision = decimal_places(buf);
382:
383: width1 = snprintf(buf, sizeof(buf), "%g", first);
384: if (strchr(buf, 'e'))
385: cc = 'e';
386: if ((places = decimal_places(buf)))
387: width1 -= (places + strlen(decimal_point));
388:
389: precision = MAXIMUM(places, precision);
390:
391: width2 = snprintf(buf, sizeof(buf), "%g", last);
392: if (strchr(buf, 'e'))
393: cc = 'e';
394: if ((places = decimal_places(buf)))
395: width2 -= (places + strlen(decimal_point));
396:
397: /* XXX if incr is floating point fix the precision */
398: if (precision) {
399: snprintf(buf, sizeof(buf), "%%%c%d.%d%c", pad,
400: MAXIMUM(width1, width2) + (int) strlen(decimal_point) +
401: precision, precision, (cc) ? cc : 'f');
402: } else {
403: snprintf(buf, sizeof(buf), "%%%c%d%c", pad,
404: MAXIMUM(width1, width2), (cc) ? cc : 'g');
405: }
406:
407: return buf;
408: }
409:
410: static __dead void
411: usage(int error)
412: {
413: fprintf(stderr,
1.2 ! rob 414: "usage: %s [-w] [-f format] [-s string] [first [incr]] last\n",
1.1 millert 415: getprogname());
416: exit(error);
417: }