*
* Copyright (C) 2004, Glenn McGrath
*
- * Licensed under the GPL v2, see the file LICENSE in this tarball.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
+//config:config SEQ
+//config: bool "seq (3.6 kb)"
+//config: default y
+//config: help
+//config: print a sequence of numbers
-#include "libbb.h"
+//applet:IF_SEQ(APPLET_NOEXEC(seq, seq, BB_DIR_USR_BIN, BB_SUID_DROP, seq))
+/* was NOFORK, but then "seq 1 999999999" can't be ^C'ed if run by hush */
+
+//kbuild:lib-$(CONFIG_SEQ) += seq.o
+
+//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"
-/* This is a NOFORK applet. Be very careful! */
+#include "libbb.h"
+/* This is a NOEXEC applet. Be very careful! */
int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int seq_main(int argc, char **argv)
OPT_w = (1 << 0),
OPT_s = (1 << 1),
};
- double last, increment, i;
+ double first, last, increment, v;
+ unsigned n;
+ unsigned width;
+ unsigned frac_part;
const char *sep, *opt_s = "\n";
- unsigned opt = getopt32(argv, "+ws:", &opt_s);
- unsigned width = 0;
+ 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;
- i = increment = 1;
+ first = increment = 1;
+ errno = 0;
switch (argc) {
+ char *pp;
case 3:
- increment = atof(argv[1]);
+ increment = strtod(argv[1], &pp);
+ errno |= *pp;
case 2:
- i = atof(*argv);
+ first = strtod(argv[0], &pp);
+ errno |= *pp;
case 1:
- last = atof(argv[argc-1]);
- break;
+ last = strtod(argv[argc-1], &pp);
+ if (!errno && *pp == '\0')
+ break;
default:
bb_show_usage();
}
- if (opt & OPT_w) /* Pad to length of start or last */
- width = MAX(strlen(*argv), strlen(argv[argc-1]));
- /* You should note that this is pos-5.0.91 semantics, -- FK. */
+#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;
+
sep = "";
- while ((increment > 0 && i <= last) || (increment < 0 && i >= last)) {
- printf("%s%0*g", sep, width, i);
+ 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;
- i += increment;
+ /* v += increment; - would accumulate floating point errors */
+ n++;
+ v = first + n * increment;
}
- bb_putchar('\n');
- return fflush(stdout);
+ if (n) /* if while loop executed at least once */
+ bb_putchar('\n');
+
+ return fflush_all();
}