/*
* seq implementation for busybox
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
+ * Copyright (C) 2004, Glenn McGrath
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include "busybox.h"
+//usage:#define seq_trivial_usage
+//usage: "[-w] [-s SEP] [FIRST [INC]] LAST"
+//usage:#define seq_full_usage "\n\n"
+//usage: "Print numbers from FIRST to LAST, in steps of INC.\n"
+//usage: "FIRST, INC default to 1.\n"
+//usage: "\n -w Pad to last with leading zeros"
+//usage: "\n -s SEP String separator"
+
+#include "libbb.h"
-extern int seq_main(int argc, char **argv)
+/* This is a NOFORK applet. Be very careful! */
+
+int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int seq_main(int argc, char **argv)
{
- double last;
- double first = 1;
- double increment = 1;
- double i;
-
- if (argc == 4) {
- first = atof(argv[1]);
- increment = atof(argv[2]);
- } else if (argc == 3) {
- first = atof(argv[1]);
- } else if (argc != 2) {
- bb_show_usage();
+ enum {
+ OPT_w = (1 << 0),
+ OPT_s = (1 << 1),
+ };
+ double first, last, increment, v;
+ unsigned n;
+ unsigned width;
+ unsigned frac_part;
+ const char *sep, *opt_s = "\n";
+ unsigned opt;
+
+#if ENABLE_LOCALE_SUPPORT
+ /* Undo busybox.c: on input, we want to use dot
+ * as fractional separator, regardless of current locale */
+ setlocale(LC_NUMERIC, "C");
+#endif
+
+ opt = getopt32(argv, "+ws:", &opt_s);
+ argc -= optind;
+ argv += optind;
+ first = increment = 1;
+ errno = 0;
+ switch (argc) {
+ char *pp;
+ case 3:
+ increment = strtod(argv[1], &pp);
+ errno |= *pp;
+ case 2:
+ first = strtod(argv[0], &pp);
+ errno |= *pp;
+ case 1:
+ last = strtod(argv[argc-1], &pp);
+ if (!errno && *pp == '\0')
+ break;
+ default:
+ bb_show_usage();
}
- last = atof(argv[argc - 1]);
- /* You should note that this is pos-5.0.91 semantics, -- FK. */
- if ((first > last) && (increment > 0)) {
- return EXIT_SUCCESS;
+#if ENABLE_LOCALE_SUPPORT
+ setlocale(LC_NUMERIC, "");
+#endif
+
+ /* Last checked to be compatible with: coreutils-6.10 */
+ width = 0;
+ frac_part = 0;
+ while (1) {
+ char *dot = strchrnul(*argv, '.');
+ int w = (dot - *argv);
+ int f = strlen(dot);
+ if (width < w)
+ width = w;
+ argv++;
+ if (!*argv)
+ break;
+ /* Why do the above _before_ frac check below?
+ * Try "seq 1 2.0" and "seq 1.0 2.0":
+ * coreutils never pay attention to the number
+ * of fractional digits in last arg. */
+ if (frac_part < f)
+ frac_part = f;
+ }
+ if (frac_part) {
+ frac_part--;
+ if (frac_part)
+ width += frac_part + 1;
}
+ if (!(opt & OPT_w))
+ width = 0;
- for (i = first; ((first <= last) ? (i <= last) : (i >= last));
- i += increment) {
- printf("%g\n", i);
+ sep = "";
+ v = first;
+ n = 0;
+ while (increment >= 0 ? v <= last : v >= last) {
+ if (printf("%s%0*.*f", sep, width, frac_part, v) < 0)
+ break; /* I/O error, bail out (yes, this really happens) */
+ sep = opt_s;
+ /* v += increment; - would accumulate floating point errors */
+ n++;
+ v = first + n * increment;
}
+ if (n) /* if while loop executed at least once */
+ bb_putchar('\n');
- return EXIT_SUCCESS;
+ return fflush_all();
}