1 /* vi: set sw=4 ts=4: */
3 * seq implementation for busybox
5 * Copyright (C) 2004, Glenn McGrath
7 * Licensed under the GPL v2, see the file LICENSE in this tarball.
11 /* This is a NOFORK applet. Be very careful! */
13 int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
14 int seq_main(int argc, char **argv)
20 double first, last, increment, v;
24 const char *sep, *opt_s = "\n";
27 #if ENABLE_LOCALE_SUPPORT
28 /* Undo busybox.c: on input, we want to use dot
29 * as fractional separator, regardless of current locale */
30 setlocale(LC_NUMERIC, "C");
33 opt = getopt32(argv, "+ws:", &opt_s);
36 first = increment = 1;
41 increment = strtod(argv[1], &pp);
44 first = strtod(argv[0], &pp);
47 last = strtod(argv[argc-1], &pp);
48 if (!errno && *pp == '\0')
54 #if ENABLE_LOCALE_SUPPORT
55 setlocale(LC_NUMERIC, "");
58 /* Last checked to be compatible with: coreutils-6.10 */
62 char *dot = strchrnul(*argv, '.');
63 int w = (dot - *argv);
70 /* Why do the above _before_ frac check below?
71 * Try "seq 1 2.0" and "seq 1.0 2.0":
72 * coreutils never pay attention to the number
73 * of fractional digits in last arg. */
80 width += frac_part + 1;
88 while (increment >= 0 ? v <= last : v >= last) {
89 printf("%s%0*.*f", sep, width, frac_part, v);
91 /* v += increment; - would accumulate floating point errors */
93 v = first + n * increment;
95 if (n) /* if while loop executed at least once */
98 return fflush(stdout);